PQWeb 2 - Tectra
Contents
1. may select a sag or swell whichever has the largest perunit deviation from 1 0 e Max V S Area selects a sag or swell with maximum volt time product above or below 1 0 perunit e Min V selects the worst perunit sag e Max V selects the worst perunit swell e UNIPEDE DISDIP constructs a sag with worst voltage deviation and maximum duration recorded Electrotek Concepts Inc 28 Administration e Magnitude Range choose a voltage magnitude range per unit to include in the report or enter a custom range in the edit fields e Duration Range choose a duration range cycles to include in the report or enter a custom range in the edit fields After you click Save any changes take effect for the next query or graph request If you accessed this page from the menu link on an RMS Summary Report page the report will be automatically regenerated using the new preferences 32 Event Display Preference This set of preferences affects the Event List report Home Reports Help Show in Event List Plot Channels Superimposed Plots v RMS Variations C Trigger Only C Superimpose All v Transients C All Channels Group Channels C Plot All Separately Show Event ID Customize Iv vafvab M Ia M Show Event ID Iv vb vbc M Ib Iv veca M Ic l vneut Ineut vres D Ires Event Reports Iv Open in New Window Save Cancel Set Defaults Figure 15 Event Display Preferences page e Show in Event List choose2. Iv Include Steady State Records owe Figure 17 Monitor Days Preferences page After you click Save any changes take effect for the next query or graph request If you accessed this page from a menu link on a report page the report will be automatically regenerated with the new preferences Electrotek Concepts Inc 31 Administration 3 4 1 Steady State Records Because of the excessive processing time that would result PQWeb does not unpack steady state records to examine individual monitor days Most PQView databases store steady state trend data in packed weekly records In some cases the record length may be shorter depending on how data was imported Due to the way PQWeb calculates monitor days monitor availability will be overestimated 1f the monitor was out of service for a few days within a weekly record Typically this overestimate might be 10 Options for dealing with this issue include e Turn off consideration of steady state records on the Monitor Days Preferences page This will probably underestimate the availability e Some newer PQView databases have monitor event records described under the next heading These allow efficient monitor availability calculations with a daily granularity e Accept this level of inaccuracy 3 4 2 Monitor Event Records Some newer PQView databases have monitor event records added for each day that a steady state measurement was taken whether or not a transient or rms variat
3. Steady State REDON o e a tetas C CC a eh 20 E M ique m aaa 22 2 8 2 Values and Min Max Avg Envelopes esses esee eene enne enne enne 22 2 8 3 Steady State Phase Aggregation 5o eerte Inn ete arae eo ve eate ena enanas 23 2 84 Steady State Trend ZOOM es candi ca ebat t dina Du ebd idt i II 23 2 8 5 Histograms and Probability Tables ioci citet dsd ii 23 2 9 Monitor Availability Report leisten tee seen t ee tk e eat S Ne See li Deu 25 22D Min SteadyState RECOrd a a 26 29 2 Mentor Event Records eet aap aR RE E R EES 26 A User Guide tosPrererenees cedes teca ette A DA 27 3 1 Preferences for RMS Variation Summary esses enne enne enne 24 9h Event Display Preference unn E UU d Y I RUIT dA Da oi Rad 1 dE Ee S ANa 29 Electrotek Concepts Inc 9 Graph PRET ete NCES scdoso ids annot Gestesa p iepet oM ade Maletas pd iisia eat adiu Loos des 3 4 Monitor Day SPrer ere nee Sae eo p Se 3 4 1 Steady State Recordad 3 4 2 Monitor Event Records ido tete ede site E a E xcd e Lesbia iride 3 3 Trend Channel Preferences a E bi ur 3 6 Trend Display Preferences A A 4 T torial Examples s ennn nn e ad 4 1 Eyent List Example resien T E E EEE 4 2 RMS Summary Example 4 3 steady state Trend BXample nie Electrotek Concepts Inc List of Figures Figure 1 Enter a password to access the PQView database sss 5 Figure 2 PO Web home Paria 6 Figure 35 POWeb R
4. e RMS Variation Events lt 90 e RMS Variation Events lt 80 e RMS Variation Events lt 75 e RMS Variation Events lt 50 e RMS Variation Events lt 10 Shortcut event lists have a different format than the Aggregated event list because less processing is performed on the data Figure 5 shows a shortcut event list From 5 27 1995 to 6 3 1995 a a NEUE 8n m Name pe Magnitude SITE4 5 30 1995 10 09 24 PM TET 124 37 SITE4 5 30 1995 7 29 27 PM Oscillatory 106 60 SITE4 5 29 1995 1 56 47 AM Oscillatory 102 07 SITE4 5 29 1995 1 56 45 AM RMS Variation 88 45 SITE4 5 29 1995 1 56 44 AM Oscillatory 101 57 SITE4 5 29 1995 1 56 39 AM Oscillatory 102 00 SITE4 5 29 1995 1 56 38 AM RMS Variation 87 76 5 29 1995 1 56 37 AM Oscillatory 102 72 5 28 1995 8 35 00 AM Oscillatory 124 08 Table includes 9 events Figure 5 Shortcut Event List Electrotek Concepts Inc 12 Queries and Reports 2 5 Event Report If you click the Event Description link for an event in any of the event list reports an Event Report containing a table and graphs will be displayed as shown in Figure 6 An Event Report also appear when you click the link for an RMS variation with some differences described later On the Graph Preferences page section 3 3 there is a checkbox which controls whether the Event Report will be displayed in a new browser window or in the same browser window as the Event List PQWeb Event View Trans
5. 4M Oscillatory 104 5895 SITE1 5 29 1995 12 07 53 PM Oscillatory 102 08 SITE1 5 29 1995 8 17 02 AM RMS Variation 93 74 SITE1 5 29 1995 8 17 02 AM Oscillatory 101 45 SITE1 5 29 1995 7 55 10 4M Impulse 191 0195 SITE1 5 29 1995 4 14 01 AM RMS Variation 91 68 SITE1 5 29 1995 4 14 01 AM Oscillatory 112 93 z Figure 21 Event List Report 9 Click on the Voltage Magnitude value for the first event in the list to bring up an Event Report Figure 22 for that event in a separate window Electrotek Concepts Inc 37 Administration Event Preferences Graph Preferences RMS Variation Phase B RMS Voltage Inst Sag SITE1 05 30 1995 13 15 03 Trigger at 0 on vb RMS RMS Variation SITE1 05 30 1995 13 15 03 10 Phase A RMS Voltage Phase B RMS Voltage Phase CRMS Voltage 0 8 0 6 0 4 RMS Voltage pu V D 2 0 0 0 50 100 150 200 250 300 Time ms Figure 22 Event Report 10 To return to the Reports page from the Event List report click the Reports link in the navigation menu below the page header or use your browser s Back button 4 2 RMS Summary Example 1 Bring up the PQWeb Home page Figure 2 by typing in the URL or clicking on a link provided by your Web Administrator and entering your user ID and password Figure 1 2 Select Sample21 in the listbox of database names or select any other available database Electrotek Concepts Inc 38 Administration Click the Continue button
6. Knoxville is in the Eastern Time Zone the local site time would be 1300 hours on February 1 If the UTC time stamp were 1800 hours UTC on July 1 the local site time would be 1200 hours because of the DST correction Electrotek Concepts Inc 9 Queries and Reports In the United States Canada and Mexico daylight saving time begins at 2 00 AM on the first Sunday of April and ends at 2 00 AM on the last Sunday of October In most of the countries of western Europe including the countries that are members of the European Union daylight saving time begins at 1 00 AM GMT on the last Sunday of March and ends at 1 00 AM GMT on the last Sunday of October Daylight Saving Time for the U S and its territories is not observed in Hawaii American Samoa Guam Puerto Rico the Virgin Islands the Eastern Time Zone portion of the State of Indiana and by most of Arizona with the exception of the Navajo Indian Reservation in Arizona In PQWeb the local site time is computed from site characteristics stored in the database The time zone at the Web server or at the client browser computer has no effect However the DST conversion rules for example USA or European Union are set at the Web server 2 3 2 Time Stamps GPS Some power quality meters synchronize their internal clocks periodically to a highly accurate time signal from the Global Positioning Satellite System These events have their time stamps highlighted in red 2 3 3 RMS V
7. This will bring up the Reports page Figure 3 Select Sitel in the listbox of sites or select any listed site if you are using a database other than Sample21 Select Full Date Range in the listbox of time range shortcuts Select RMS Summary in the listbox of RMS Variation reports Click the Report button in the RMS Variations section pe c qm Mi After a brief delay for data retrieval the RMS Summary report Figure 23 will be displayed Event RMS Agg Preferences Preferences Preferences Result for SITE1 from 04 30 1995 00 00 00 to 06 03 1995 00 00 00 local site time from 04 30 1995 04 00 00 to 06 03 1995 04 00 00 UTC RMS Aggregation Phase No Time Fixed Win Est Mon Days Rate 30 days Max Y dev All Mag Dur 1 5 2 5 cyc Event List Type Site Event Description Time Stamp PU Duration RMS Phase B RMS Voltage Inst 05 08 1995 Variation SITEL Sag 08 36 12 0 7723 2 0Cyc Hd RMS Phase 4 RMS Voltage Inst 05 30 1995 Variation SITE1 ES 08 00 09 0 8768 2 0 Cyc RMS Phase B RMS Voltage Inst 05 30 1995 Variation SITE1 pa 08 00 09 0 6844 2 0 Cyc RMS Phase B RMS Voltage Inst 05 30 1995 variation PIEL ES ee 0 7625 2 0 Cyc Table includes 4 events Magnitude Duration Plot Figure 23 RMS Summary Report 9 To return to the Reports page from the RMS Summary report click the Reports link in the navigation menu below the page header or use your browser s Back button Ele
8. category the page shown below appears This example uses the Voltage category Reports Voltage Volts Add these channels Use only these channels Cancel A B C AB BC CA N Res Net Instantaneous Voltage m mi ati mi mi minminmism Voltage Spectrum ninininipinininirm Peak Voltage EM BE EE EE EE EE EE EM RMS Voltage MMM OO OOOO Harmonic RMS Voltage gig m m mw ol ll ll m Voltage Total Harmonic Distortion niolololololololia Voltage Even Harmonic Distortion miminminminmimi nmimi m Voltage Odd Harmonic Distortion mipinipininpinminpmirnm Voltage Frequency B Voltage Crest Factor olololo lolo lo lolo Voltage Form Factor gigi al el el el ll ll Voltage Arithmetic Sum Dnnpnnmnnmnininininm E Figure 19 Trend Channel Selection page This page lists all available channels in the selected channel category with a checkbox for each available phase for that channel If phases do not apply to a particular channel then a single checkbox will appear to the left of the phase columns as shown for Voltage Frequency in the page shown above You can select channels and phases for your Trend reports by clicking on the appropriate check boxes After you have made your selections click the Add These Channels button to add the channels in this category to channels you have selected in other categories To use only the selected channels in this category click the Use Only These Channels button To cancel your selections in this category cli
9. normalized by the average of the three phases e Unbalance Plots the negative sequence and zero sequence unbalance for voltage and current Customizing Trend Reports To customize the graphs you can do any or all of the following e Click the Graph Preferences link at the top of the report change the preferences section 3 3 and click the Save button on that preferences page The report will automatically regenerate using the new preferences e Click the Trend Preferences link at the top of the report change the preferences section 3 6 and click the Save button on that preferences page The report will automatically regenerate using the new preferences e Click the Channels link at the top of the report change your channel selection s section 3 5 and click the Save button on that preferences page The report will automatically regenerate using the newly selected channels e Change Trend Graph Customization options as described below Then click the Regenerate Graphs button on the Steady State Report Page to re generate the table and graphs 2 8 1 Harmonics Harmonic components are plotted by choosing a voltage or current spectrum channel and entering an integer harmonic order on the Trend Display Preferences page see section 3 6 When plotting harmonic components there may be zero values plotted if there is no value recorded for that component at the sample time but there are values for other harmonic components at th
10. to include Transients or RMS Variations in the list of events One or both may be selected e Show Event ID If this box is checked the database event ID number will be included at the lower left corner of the plot in Event Reports e Plot Channels for event plots you may include just the triggered channel all recorded channels or a set of selected channels e Superimposed Plots when more than one channel is plotted you can have each channel on a separate graph or all channels on the same graph The Group Channels option will plot all voltages on one graph and all currents on a second graph Also see the Multiple Curve options under Graph Preferences especially when mixing voltages and currents on the same graph Electrotek Concepts Inc 29 Administration e Event Reports Select the checkbox to open event reports in a new browser window Clear the checkbox to open the reports in the same browser window as the event list After you click Save any changes take effect for the next query or graph request If you accessed this page from a menu link on a report page the report will be automatically regenerated with the new preferences 33 Graph Preferences This set of preferences affects all graphs Home Image Size Width pixels 600 Height pixels 00 Y Axis Scaling C Start at zero Auto scaling Voltage Display Units C per Unit C Percent C 120 volt Base amp Actual volts Reports Legend
11. 41 Electrotek Concepts Inc 1 Overview PQWeb is a viewing and reporting program for power quality data stored in a PQView database The functionality provided to an end user includes Event listing of transients and RMS variations Waveform plotting and zooming Summary report of RMS variations with magnitude duration plots Trend plots and histograms of steady state samples Monitor availability report Download files in Power Quality Data Interchange Format PQDIF Users need an Internet browser compliant with JavaScript 1 3 and with Portable Network Graphics PNG format Supported versions include Internet Explorer 4 72 or later and Netscape Navigator 4 72 or later PQWeb opens databases in read only mode and never alters any database Its use is limited to retrieving data for viewing and analysis 1 1 What s New Improvements and changes in PQWeb version 3 0 The Event Summary Table report has been expanded offering a variety of shortcuts for retrieving lists without editing the preferences All of the shortcuts return non aggregated lists of events resulting in faster retrieval of the data Waveform plots are now included in RMS Variation event reports when available Trend reports can now be generated for any channel in the selected database including channels new to PQView 3 0 The default voltage normalization option has been changed from 120V base to actual volts The site name list box on th
12. PQWeb 3 0 User Manual November 2002 DISCLAIMER OF WARRANTIES AND LIMITATION OF LIABILITIES THIS NOTICE MAY NOT BE REMOVED FROM THE PROGRAM BY ANY USER THEREOF NEITHER EPRI ANY MEMBER OF EPRI NOR ANY PERSON OR ORGANIZATION ACTING ON BEHALF OF THEM 1 MAKES ANY WARRANTY OR REPRESENTATION WHATSOEVER EXPRESS OR IMPLIED INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS OF ANY PURPOSE WITH RESPECT TO THE PROGRAM OR 2 ASSUMES ANY LIABILITY WHATSOEVER WITH RESPECT TO ANY USE OF THE PROGRAM OR ANY PORTION THEREOF OR WITH RESPECT TO ANY DAMAGES WHICH MAY RESULT FROM SUCH USE RESTRICTED RIGHTS LEGEND USE DUPLICATION OR DISCLOSURE BY THE UNITED STATES FEDERAL GOVERNMENT IS SUBJECT TO RESTRICTION AS SET FORTH IN PARAGRAPH g 3 i WITH THE EXCEPTION OF PARAGRAPH g 3 i b 5 OF THE RIGHTS IN TECHNICAL DATA AND COMPUTER SOFTWARE CLAUSE IN FAR 52 227 14 ALTERNATE III ORGANIZATION S THAT PREPARED THIS PACKAGE Electrotek Concepts Inc ORDERING INFORMATION Requests for copies of this package should be directed to 1 800 313 3774 PQWeb and PQView are registered trademarks of Electrotek Concepts Inc and are part of the EPRI Power Quality Diagnostic System InstallShield is a registered trademark of InstallShield Software Corporation Microsoft Windows and Windows NT are registered trademarks of the Microsoft Corporation Electric Power Research Institute and EPRI are registered service marks of the Electric Pow
13. Placement Top C Left C Bottom Right C None Comment Placement Top C Bottom Multiple Curve Options Superimpose C Stack Graphs C All Y Axes on Left C Left Right Y Axes M Use Colors I Use Line Styles Help Grid Divisions M Major X Divisions I Minor X Divisions Iv Major Y Divisions I Minor Y Divisions Grid Style C None Thin Lines Thick Lines C Dotted Lines C Dashed Lines Save Cancel Set Defaults xi Figure 16 Graph Preferences page e Image Size all report graphs will be the same size in pixels as specified here You can make the graphs larger to take advantage of your screen resolution but larger images take longer to download e Y Axis Scaling Options controls whether trend and RMS plots will be automatically scaled in the Y axis or whether the Y axis will always start at zero e Voltage Display Units you may plot voltages in per unit on the Site nominal base in percent of nominal voltage in actual volts or normalized to a 120 volt base This Electrotek Concepts Inc 30 Administration preference applies to all instantaneous and RMS voltage channels in Event plots RMS Variation plots and Steady State Trend plots e Legend Placement Options for graphs with multiple curves the legend can be omitted or placed on any of the four sides of the graph The legend never appears for a graph with just one curve e Comment Placement Options the graph zoo
14. The trigger time where available is plotted with a vertical dash dot dot line on the graphs On voltage graphs for RMS variations the site specific thresholds for characterizing RMS variations are plotted with horizontal dash dot dot lines To customize these graphs you can do any or all of the following e Click on the Graph Preferences link at the top of the report section 3 3 change preferences and click the Save button on that preferences page The report will automatically regenerate using the new preferences e Click on the Event Preferences link at the top of the report section 3 2 change preferences and click the Save button on that preferences page The report will automatically regenerate using the new preferences e Change Graph Customization options as described in the next section Then click the Regenerate Graphs button on the Event Report Page to re generate the table and graphs If you click the Event Description link for an RMS Variation in an event list report the graphs will appear before the tabular summary as shown in Figure 7 This example was created with aggregation in effect so the plot shows two sub events aggregated into the same event because they were only a few seconds apart With sub events the tabular summary can be much longer so it is placed below the graphs RMS variation aggregation is described in section 3 1 Many RMS variation events also have transient waveforms available If these exist in
15. Time Figure 11 Steady state trend plot The report displays tabular and plotted output for steady state measurements In trend plots a vertical grid line plotted for a date is always midnight local time Trend plots may include gaps Electrotek Concepts Inc 20 Queries and Reports in the data or individual data points where it appears that a regular series of samples was interrupted If the interval between samples increases by more than a factor of 2 PQWeb assumes a gap in the data Figure 11 shows three gaps of missing data Multiple Site Aggregated Trends If a Trend report is created when more than one site is selected the data from the multiple sites is aggregated as follows e For Current and Power channels the data is summed This allows you to create a report of the total current or power flowing through several instruments e For other channels such as Voltage or Temperature the data is averaged Trend Shortcut Reports Several shortcut reports are also available in the Trends listbox on the Reports page These reports use the site and time range selections you have made but do not require you to select channels or set preferences Each trend shortcut uses a preselected set of channels and preferences Shortcut trends never aggregated data between sites or by time If multiple sites are selected for a shortcut trend separate plots are generated for each site The available Trend Shortcut Reports include e 1 Phase
16. Voltage Plots RMS Voltage with values and envelopes superimposed for phases A B and C e 3 Phase Voltage Plots RMS Voltage with values superimposed and envelopes plotted separately for phases A B and C e 1 Phase Current Plots RMS Current with values and envelopes superimposed for phases phases A B and C e 3 Phase Current Plots RMS Current with values superimposed and envelopes plotted separately for phases A B and C e 3 Phase Voltage and Current Plots both RMS Voltage and RMS Current with values superimposed and envelopes plotted separately for phases A B and C e 1 Phase Power Plots Real Power with values and envelopes superimposed for phases A B and C e 3 Phase Power Plots Real Power with values superimposed and envelopes plotted separately for phases A B and C e Harmonic Plots Harmonic RMS Voltage and Harmonic RMS Current for phases A B C AB BC and CA e Frequency Plots the voltage frequency e Flicker Plots Short term and Long term Flicker Severity value for phases A B C AB BC and CA e Energy Plots three phase cumulative watt hours and three phase watt hours consumed in each time interval Also plots cumulative and interval var hours and VA hours if the data is available Electrotek Concepts Inc 21 Queries and Reports e Imbalance Plots voltage and current magnitude imbalance defined as the maximum deviation from the average of the three phases
17. analyzing rms voltage variations PQWeb 3 0 includes the Information Technology Industry Council ITIC and SEMI Std 2844A curves for its rms voltage variation report Three equipment compatibility curves from IEEE Std 1346 1998 can also be selected PQDIF Waveforms rms voltage variations trends and histograms can be downloaded as IEEE P1159 3 PQDIF files that can be analyzed or saved to your local computer For example TOP The Output Processor is a free viewer that can read PQDIF files Another popular PQDIF viewer is DRAN VIEW Online Help PQWeb 3 0 offers online help with every web page Database Flexibility PQWeb 3 0 can query any PQView database stored in Microsoft Access 95 Access 97 or Access 2000 format or in Microsoft SQL Server 6 5 or SQL Server 7 0 format SQL Server Queries Run Faster PQWeb 3 0 connects directly to SQL Server where PQWeb 2 0 used a slower indirect connection This means that queries to SQL Server databases will run significantly faster Many of the queries in PQWeb have also been redesigned to take advantage of client server database processing User Customizable The preferences for each user s browser are saved locally using cookies Administrator Customizable As PQWeb 3 0 employs a combination of Active Server Page files and ActiveX server objects it can be customized and extended by a developer familiar with web programming PQWeb Administration Utility A new PQWeb Administration utility p
18. ariations The duration of an RMS variation is computed by determining the time that a particular voltage channel is above a voltage swell threshold or below a voltage sag threshold Typically these thresholds are 0 9 perunit for sags and 1 1 perunit for swells They may be set at different values for individual sites in the database The preferences page for RMS Variation Aggregation described in section 3 1 controls how sub events may be grouped into the events listed 2 3 4 Transient Type Transient disturbances are caused by the injection of energy by switching or by lightning The disturbance may either be unidirectional or impulsive or oscillatory Lightning electrostatic discharge load switching or capacitor switching may cause a unidirectional transient It is characterized by its peak value and rise time An oscillatory transient is characterized by its frequency content and may be caused by a switching operation such as the energization of a capacitor bank distribution line or cable or the opening of an inductive current Low and medium frequency oscillations with principle frequencies less than 2 kHz are normally caused by power system switching The switching of a load close in proximity may cause high frequency oscillations with principle frequencies above 2 kHz Common solutions to problems caused by transients include the application of surge arresters passive and active filters and isolation transformers 2 3 5 Trans
19. been set up by the administrator 4 1 Event List Example 1 Bring up the POWeb Home page Figure 2 by typing in the URL or clicking on a link provided by your Web Administrator and entering your user ID and password Figure 1 2 Select Sample21 in the listbox of database names or select any other available database 3 Click the Continue button This will bring up the Reports page Figure 3 Select Sitel in the listbox of sites or select any listed site if you are using a database other than Sample21 Select Full Date Range in the listbox of time range shortcuts Select All Events in the listbox of Event reports Click the Report button in the Events section is ON Wi After a brief delay for data retrieval the Shortcut Event List report Figure 21 will be displayed Electrotek Concepts Inc 36 Administration From 4 30 1995 to 6 3 1995 Name Stamp pe Magnitude SITE1 5 30 1995 1 15 03 PM RMS Variation 76 25 SITE1 5 30 1995 1 15 02 PM Oscillatory 109 17 SITE1 5 30 1995 8 00 09 AM RMS Variation 68 44 SITE1 5 30 1995 8 00 08 AM Oscillatory 108 3496 SITE1 5 30 1995 7 53 18 AM RMS Variation 75 97 SITE1 5 30 1995 7 53 17 AM Oscillatory 100 27 SITE1 5 30 1995 7 53 17 AM Oscillatory 101 52 SITE1 5 30 1995 7 53 16 4M Oscillatory 106 0495 SITE1 5 30 1995 7 53 14 AM RMS Variation 72 05 SITE1 5 30 1995 7 53 14 AM Oscillatory 100 27 SITE1 5 30 1995 7 38 15 AM RMS Variation 91 65 SITE1 5 30 1995 7 38 15
20. can download any data plotted in PQWeb including data that may not be zoomed by clicking on the PQDIF Download link as shown in Figure 8 You will have an opportunity to save the PQDIF file to disk or open it directly in a PQDIF viewing program A free PQDIF viewing program for 32 bit Windows may be downloaded from www pqsoft com top More information on PQDIF is available at http grouper ieee org groups 1159 3 Electrotek Concepts Inc 17 Queries and Reports 2 7 RMS Variation Report Select RMS Summary in the RMS Variations listbox and press the Reports button in the RMS Variations section of the Reports page to create an RMS Variation Summary report as shown in Figure 10 The upper portion summarizes the query parameters and aggregation options In this example only the scatter plot has been included in the report PQWeb RMS Variation Summary Result for 4 sites from 10 01 1994 00 00 00 to 10 05 2000 00 00 00 local site time from 10 01 1994 04 00 00 to 10 05 2000 04 00 00 UTC RMS Aggregation Phase No Time Fixed Win Est Mon Days Rate 30 days Max Y dev Sags All Dur Magnitude Duration Plot RMS Variations Magnitude Duration Scatter Plot 4 sites 10 01 1994 04 00 00 to 10 05 2000 04 00 00 CBEMA 8 7 Backgroumd 400 WIL 005 000 I EEEETI E ji T Lui TI CERE Co ao c Rc o gt e 2 1 n 2 103 Time cy cles Figure 10 Scatter plot from the RMS varation report This report contains u
21. ck Cancel Clicking any of these three buttons will return you to the Channel Categories page shown in Figure 18 Electrotek Concepts Inc 33 Administration After you click OK on the Channel Categories page any changes take effect for the next query or graph request If you accessed this page from a menu link on a Trend Report page the report will be automatically regenerated with the newly selected channels 3 6 Trend Display Preferences This set of preferences determines which types of plot appear in the Steady State Trend report You must choose at least one trend plot or one histogram plot Home Reports Help Trend Plots Grouped Trend Values Histogram Plots M values Separate Phases F Values M Minimum C Superimpose Phases F Minimum M Maximum F Maximum M Average Grouped Min Max Avg I Average Y Axis Scaling Geparate Phases Histogram Bin Size C Superimpose Phases Start at zero C Aggregate Phases Automatic C Auto scaling C Manual 1 Harmonics Aggregation Grouped Histogram Harmonic Order 5 Units Days y C Separate Phases Aggregate Phases Interval fi Save Cancel Set Defaults Figure 20 Trend Display Preferences page Ls e Trend Plots choose to plot all measured values and or a set of up to three curves for the minimum maximum and average values e Y Axis Scaling controls whether trend and RMS plots will be automatically scaled in the Y axis or whether the Y axis will always
22. ctrotek Concepts Inc 39 Administration 4 3 Steady State Trend Example 1 Bring up the PQWeb Home page Figure 2 by typing in the URL or clicking on a link provided by your Web Administrator and entering your user ID and password Figure 1 2 Select Sample21 in the listbox of database names or select any other available database 3 Click the Continue button This will bring up the Reports page Figure 3 Select Sitel in the listbox of sites or select any listed site if you are using a database other than Sample21 Select Full Date Range in the listbox of time range shortcuts Click on the Channels link in the Trends section of the Reports page Click the Clear All button on the Channel Category Selection page Figure 18 9o v Qv Uh Click on the Voltage link on the Channel Category Selection page This will bring up the Channel Selection page Figure 19 9 Select the checkboxes for RMS Voltage phases A B and C 10 Click the Use Only These Channels button on the Channel Selection page 11 Click the OK button on the Channel Category Selection page 12 Select Steady State from the listbox in the Trends section of the Reports page 13 Click the Report button in the Trends section 14 After a brief delay for data retrieval the Steady State Trend report Figure 24 will be displayed Electrotek Concepts Inc 40 Administration Trend Plots SITE1 Phase 4 RMS Voltage Phase B RMS Voltage Phase CRMS Vo
23. discusses other impacts on the characterization of RMS variations Home Include in Report Aggregation Iv Event List Characterization Level Monitor Days Method M Mag Duration Plot Phase Estimated gt Iv Histogram Table i ime None 30 y 3D Histogram Aggregation Time Rate days Window Type Fixed y Worst Case Method Max V Deviation y Magnitude Duration Curve Magnitude Range pu Duration Range cycles CBEMA All Al C ITIC C Sags 0 0to 0 9 C Instantaneous 1 to 30 C SEMI C Swells over 1 1 C Momentary 30 to 180 C DPDT Relay C Interruptions 0 0 to 0 1 C Temporary 180 to 3600 C 24 vde Power Supply C Custom o to r4 C Short duration 1to 3600 C PLC C Sustained over 3600 C Custom fi to 3600 Save Cancel Set Defaults Figure 14 RMS Summary Preferences page Electrotek Concepts Inc 27 Administration e Include in Report the report may include an event list with times magnitudes and durations a magnitude duration scatter plot a histogram table and or a histogram plot At least one must be chosen e Magnitude Duration Curve for the magnitude duration scatter plot a benchmark curve will be plotted in the background This may be the CBEMA Computer Business and Equipment Manufacturers Association the ITIC Information Technology Industry Council formerly CBEMA the SEMI Std 2844A or one of the curves defined in IEEE 1346 1998 e Characterization Level measu
24. e main Reports page has been lengthened site names from PQView 3 0 databases can be up to 64 characters long A variety of shortcut Steady State Trend reports are now included making it possible to generate common trend plots without selecting channels or editing preferences A welcome message is now displayed on the Home page displaying the ID of the logged in user The default Home page has been simplified Information about browser requirements was removed The Frames option was eliminated to simplify navigation between pages A navigation menu has been added to the top of each page with links to other relevant pages such as Preferences pages Electrotek Concepts Inc 1 Overview A Help link is available on each page at the top navigation menu Help pages have been improved to provide more information to first time users An option has been added to normalize event voltage to percent in event reports NT Authentication can now handle lt Domain gt lt User Name gt format The PQWeb ini file has been enhanced to allow PQWeb administrators to specify default preferences and graph color pallettes The default database specified in the Basic section of the PQWeb ini file is now selected automatically in the Home page listbox of available databases if it is included in the list of available databases for the current user A range calculation has been added to the Steady State Statistical Summary A PQWeb
25. e same sample time Because the database only stores significant levels of harmonic components this condition indicates that a harmonic measurement was taken at the sample time but did not include a significant level of the specified harmonic component 2 8 2 Values and Min Max Avg Envelopes The steady state data may consist of value series and or envelope series A value series is a set of snapshot measurements at the specified sample times An envelope series is a record of continuously updated minimum maximum and average values of a channel measurement The envelope values are recorded periodically and then reset for the next sample interval If a steady state query returns no data make sure that both Values and Min Max Avg are checked on the Steady State Display Preferences page this will return both types of data if they exist for the channel If the query still returns no data check the Monitor Availability report and also the phase selections line to ground vs line to neutral It may also be that the requested channels are truly not measured at the site in question Electrotek Concepts Inc 22 Queries and Reports 2 8 3 Steady State Phase Aggregation When trend plotting two or three phases for a channel the phases may be plotted separately superimposed or aggregated for an envelope series With superimposed value trend plots there will typically be 3 color coded traces on the graph one for each phase With superimposed en
26. eports Page a ertt lia ia ri idad da 7 Fig re4 Event list reports ecesna a di 9 Figures Sho rte t Eyent EISE eoe e a ead Se ee etu eiu eus 12 Figure 6 Event view Tor a transient suicida ec liede be eee ii ebur dae 13 Figure 7 RMS variation plot with sub events eese nennen 15 Ligure Graph ZO fors Riis acs Ee ee p e 16 Figure 9 Zoomed transient graph with a custom label eee 17 Figure 10 Scatter plot from the RMS varation report essere nennen 18 Figure 11 Steady state trend plot sui da 20 Figure 12 Steady state histogram with cumulative probability eee 24 Figure 13 Monitor availability report coii tone ot ero tas bo es p I la ede lus aa ia 25 Figure 14 RMS Summary Preferences page eesessscesssecesseeceeseecesaeecseaeeceeeeecseeeeceeeeeeneeeees 27 Figure 15 Event Display Preferences page mision inte 29 Figure 16 Graph Preferences paris is 30 Figure 17 Monitor Days Preferences parlar aii ie di Queen 31 Figure 18 Trend Channel Category Selection page esee 32 Figure 19 Trend Channel Selection page sisi scccsiescssdccdasssccasscatedatavassacisssiausscededatasestacesscedensansesane 33 Figure 20 Trend Display Preferences page il dt 34 Figure 2l Bvent LRP e A da dede 37 Figure 20 Event Report salina platas 38 Fig re 20 RMS Summary REPO a O UN 39 Figure 20 Trend RO A e A eae Ad
27. er Research Institute Inc EPRI POWERING PROGRESS is a service mark of the Electric Power Research Institute Inc O 2002 EPRI All Rights Reserved Electrotek Concepts Inc Copyright O 1999 2002 Electrotek Concepts Inc All Rights Reserved PQView and PQWeb are registered trademarks of Electrotek Concepts Inc and are part of the EPRI Power Quality Diagnostic System Electrotek Concepts Inc Table of Contents 1 cau MR c 1 1 1 Whats NeW sai ied ese cides es een iia ii dias 1 1 2 Other Changes aan di as 4 Za User Guide to Queries and Reportes ue oia 5 2 1 Login to POW eb citan RR OR rivi IE AR es Ii E DENARIUS 5 2 2 Reports e a 8 2 2 1 Datesand AA b edu e beo e eMe ee 8 22 ies Im Different TimeZone scar ceras toV edite nauta eub m nea ee 8 2 3 Eyent List Ls A ausesncedcbasaden tues aatduseoetsusta a A aes ea gubedute sess E r aS ES 9 2 3 1 Time Stamps Time Zones and Daylight Savings Time ooooccnnnccccnonccononaninanccnnnnaninnos 9 24352 Tim Stamps PO A it ee AI A ee AA 10 23 3 ES AA A oc chases ec sap staan acd ates TS 10 234 Transient Type sisi e a rs 10 2 3 3 sDIranstent DUAL dd ot Gua teas 10 2 3 6 Transient Principal Frequentes ies Pure br PUE deen 11 2 4 Shortcut Event IEIS tS ooo A N 11 2 9 Eyent REpOrt Mc 13 2 6 Graph Zooming and PQDIF Download eese 16 2 4 RMS Variation Report a5 o ese ga ope t 18 2 8
28. g The edit fields display the currently plotted minimum and maximum scale values e Y axis Manual Scale s turn off the autoscale checkbox and enter the minimum and maximum Y axis values for manual scaling of a graph The edit fields display the currently plotted minimum and maximum scale values Note that if stacked axes or stacked graph preferences are in effect the manual scale applies to all such axes in the graph The Y axis manual scale works best with the separate or superimposed graph preferences e User Comment s enter an optional subtitle for each trend graph The edit fields display any current user comments for each graph Depending on graph preferences this comment appears as a subtitle either above or below the plot area If you make preference changes such that the number of trend graphs in the re generated report will change then any mismatched custom Y axis zooms and user comments will be used in the order entered 2 8 5 Histograms and Probability Tables The histogram plot Y axis scaling is always automatic and will always contain 10 grid divisions The histogram X axis scaling can be changed with a manual bin size entered on the Steady State Display Preferences page Electrotek Concepts Inc 23 Queries and Reports The last report item is a statistical summary table of all value and envelope channels requested for either trend plots or histogram plots See the bottom of Figure 12 for an example This table conta
29. ick the Continue button to go on to the Reports page Electrotek Concepts Inc 6 Queries and Reports Select Sites Select Time Range MM DD Y Y YY HH MM SS SITES 05 27 1 335 00 00 00 To 06 03 1995 00 00 00 Shortcuts Manual Entry y Events RMS Variations Trends Other an Events y RMS Summary y Steady State Monitor Availability Report Report Report Report Preferences Preferences Preferences Preferences Select Channels Figure 3 PQWeb Reports page Electrotek Concepts Inc 7 Queries and Reports 2 2 Reports Page The Reports page appears as shown in Figure 3 At the top of page there is a listbox of measurement sites to select from and two edit fields to enter a date time range for your reports At the bottom of the page there are four categories of reports Each category has a listbox containing all available report types for that category Depending upon security policy and user authentication at the site some of the categories or reports may not appear on the page To create a report select at least one Site from the list of sites You can use ctrl click and shift click to select multiple sites Click the link below the list of sites to select all sites in the database Next select the time range for the report You can use the Shortcuts combo box in Figure 5 to quickly enter some useful date ranges including the full range of data in the database Finally select a report from
30. ient OSC SITE Z 1 05 02 1995 09 39 54 Trigger at 0 00553385 on Vb Inst Channel Negative Peak Positive Peak Duration Rise Time Principle Freq Va Inst 172 29 168 28 3 66 Cyc 1 2370 420 0 vb Inst 126 50 164 15 3 66 Cyc 0 5859 900 0 Vc Inst 168 51 170 75 3 66 Cyc 0 7161 540 0 Transient SITE Z 1 05 02 1995 09 39 54 Phase A Banus Voltage Phase B do Phase C lietanlanabud Voltage Residual liinc israc m Voltage MVP VAT AA a LIV A 200 100 PORI p 380 Instantaneous voltage V e 100 200 Time ms Figure 6 Event view for a transient Electrotek Concepts Inc 13 Queries and Reports This page displays tabular and plotted output for transients and RMS variations The report title block includes the event description the site date time stamp and the trigger time and channel when available Settings on the Event Display Preferences page described in section 3 2 determine which channels are plotted and the type of Y axis scale used Settings on the Graph Preferences page described in section 3 3 control the size grid and other visual aspects of the plot The table summarizes all recorded channels for this event even if only some channels are plotted due to preference selections The table for RMS variations will list all event sub components individually even if aggregation options are in effect The triggered channel is highlighted in red
31. ient Duration The process of computing transient duration begins by determining a duration for the waveshape fault This done by applying a floating window waveshape fault detection algorithm to the data to determine an end of trigger point in the data The detection algorithm is applied in reverse Electrotek Concepts Inc 10 Queries and Reports chronological order to the data looking from the end of the record towards the beginning There are three possible outcomes to this search 1 A waveshape fault trigger is detected on the waveform at some point before later in time than the original initiating trigger is encountered This is the case where a short but finite transient has occurred with the voltage returning to a steady state for at least one cycle before the end of the disturbance recording The duration is calculated as the time difference between the triggers 2 No waveshape fault trigger is detected because the transient did not end before the recording ended In this condition the trigger actually is detected but is the last point of the recording The reported duration is the entire length of the recording minus the pretrigger duration 3 No waveshape fault trigger is detected before the original trigger is encountered This can happen because the waveshape fault detection algorithm is not reflexive In other words using the same parameters it may not yield the same results approaching from the end of the recording as from
32. ime zones the events are ordered by Universal Coordinated Time UTC but are still displayed in local site time Therefore simultaneous events at sites in different time zones will appear consecutively in the event list but will display different local event times The query time range is padded to ensure that results for each site include at least the requested range in local time For example suppose the queried time range is 1000 1100 hours for two Electrotek Concepts Inc 8 Queries and Reports sites Site A is on U S Eastern Standard Time 5 hours behind UTC and Site B is on U S Central Standard Time 6 hours behind UTC The query time range will be adjusted to 1500 1700 hours UTC The report will include events from 1000 1200 hours local time at Site A and from 0900 1100 hours local time at Site B 2 3 Event List Reports When you select Aggregated from the Events listbox on the Reports page and click the Report button in the Events section see Figure 3 a report similar to Figure 4 appears This table lists RMS variations and or transient events for the queried sites and date range Click on an Event Description link to view a more detailed tabular summary including graphs when available in the database The contents of the list are controlled by your choices on the RMS Aggregation Preferences page see section 3 1 and the Event Display Preferences page see section 3 2 z dai RMS Ago Graph Pref Preferences Resu
33. ins several values based on histogram data and the summary table appears even when histogram plots are not requested The CP values in the table are cumulative probability values that could have been read from the histogram plot For example CP5 is the value that 5 of the samples were less than If the report includes histogram plots there is a second Regenerate Graphs button at the bottom of the page Clicking this button will regenerate the report with any changes made to the preference pages However this button does not include any manual scaling entered on the Trend Graph Customization form automatic scaling is always used Histogram Plots SITE W 4 10 01 1994 00 00 00 10 05 2000 00 00 00 RMS V oltage ageregated Values Count 95 AWNGeqaig a nenung Statistical Summary Site SITE W 4 Histogram Summary for Aggregated Phases 10 01 1994 00 00 00 to 10 05 2000 00 00 00 Channel Samples Min Max Avg StDev CP5 CP50 CP95 CP96 CP99 IV RMS Values v 2835 7256 84 7473 01 7369 90 30 40 7320 86 7370 71 7418 76 7421 23 7437 15 Figure 12 Steady state histogram with cumulative probability Electrotek Concepts Inc 24 Queries and Reports 2 9 Monitor Availability Report To create a Monitor Availability report select Monitor Availability from the listbox in the Other section at the bottom of the Reports screen then click the Report button under the listbox The report i
34. ion was recorded These records allow the calculation of daily monitor availability without unpacking the steady state records They are not counted in the totals of triggered events If the database appears to have these records a note will appear at the bottom of the report You can then turn off consideration of steady state records on the Monitor Days Preferences page with no loss of accuracy and some performance improvement 3 5 Trend Channel Preferences This set of preferences determines which channels are plotted in the Steady State report You must specify at least one channel and possibly one phase to make a Steady State report The Channel Preferences page can be accessed by clicking the Channels link in the Trends section of the Reports page or by clicking the Channels link in the menu at the top of any Steady State Trend report Clicking one of these links brings up the page shown below Home Reports Help Voltage Volts Current Amps Power Watts Temperature C Clear All OK Figure 18 Trend Channel Category Selection page Electrotek Concepts Inc 32 Administration This page lists all categories contained in the Channels table of the current PQView database Some databases contain more channel categories than others To select individual channels click on a category name To clear any previously selected channels before making your selections click the Clear All button After you have selected a
35. lt for SITE2 from 05 27 1995 00 00 00 to 06 03 1995 00 00 00 local site time from 05 27 1995 04 00 00 to 06 03 1995 04 00 00 UTC Includes Transient events RMS Aggregation Phase No Time Fixed Win Est Mon Days Rate 30 days Max Y dev All Mag All Dur Type Site Event Description Time Stamp Mag o Duration Transient SITE2 Phase A Instantaneous Voltage OSC 05 27 1995 18 37 48 107 92 3 98 Cyc Transient SITE2 Phase A Instantaneous Voltage OSC 05 28 1995 02 35 03 115 27 2 59 Cyc RMS Variation SITE2 Phase 4 RMS Voltage Inst Sag 05 28 1995 02 35 04 83 07 3 0 Cyc RMS Variation SITE2 Phase B RMS Voltage Inst Sag 05 28 1995 02 35 04 69 68 4 0 Cyc Transient SITE2 Phase A Instantaneous Voltage OSC 05 28 1995 02 35 05 115 27 3 01 Cyc Transient SITE2 Phase B Instantaneous Voltage OSC 05 28 1995 02 35 06 110 23 3 02 Cyc Transient SITE2 Phase A Instantaneous Voltage OSC 05 28 1995 02 35 07 111 35 3 82 Cyc Transient SITE2 Phase C Instantaneous Voltage OSC O5 28 1995 02 40 01 103 79 3 05 Cyc y Figure 4 Event list report 2 3 1 Time Stamps Time Zones and Daylight Savings Time The time stamp of the measurement is expressed in local site time including an adjustment for daylight savings time DST when applicable For example a measurement taken at Knoxville TN USA might be stored in the database with a time stamp of 1800 hours UTC on February 1 Since
36. ltage RMS Voltage kw E P Figure 24 Trend Report 15 To return to the Reports page from the Steady State Trend report click the Reports link in the navigation menu below the page header or use your browser s Back button Electrotek Concepts Inc 41 Administration
37. m report allows you to add a label or comment which appears as a sub title either above or below the graph e Multiple Curve Options if more than one curve appears on the graph they always use the same X axis Superimpose will force them all to use the same Y axis Stack Graphs will produce a small sub graph for each curve with separate Y axes All Y Axes on Left will provide a separate Y axis for each curve Left Right Y axes will provide separate Y axes for two curves The check boxes for Use Colors and Use Line Styles will produce automatically varied colors and line styles for the multiple curves and Y axes on the graph The Event Display and Trend Display preferences control whether multiple curves actually appear on the graphs e Grid Division Options toggles the display of major and minor grid lines for the X and Y axes When grid lines are turned off tick marks are used instead e Grid Style Options controls the line style and thickness for grid lines After you click Save any changes take effect for the next query or graph request If you accessed this page from a menu link on a report page the report will be automatically regenerated with the new preferences 3 4 Monitor Days Preferences This check box allows you to turn off consideration of steady state records in the monitor availability calculation This choice affects the monitor availability report and the normalized RMS variation indices Home Reports Help
38. not a transient or rms variation was recorded These records allow the calculation of daily monitor availability without unpacking the steady state records They are not counted in the totals of triggered events If the database appears to have these records a note will appear at the bottom of the report You can then turn off consideration of steady state records on the Monitor Days Preferences page with no loss of accuracy and some performance improvement Electrotek Concepts Inc 26 Queries and Reports 3 User Guide to Preferences PQWeb reports are configured using six preference setting pages They are accessed from links on the Reports menu under the Report button for each type of report Links to the appropriate Preferences pages are also supplied in the top menu for each report page so that preferences can be changed without returning to the Reports page Each of the preference pages operates in a similar fashion After making any changes the Save button must be clicked or the changes will not take effect Changes made on these pages are saved in a cookie and restored in subsequent sessions Each preferences page has a help link 3 1 Preferences for RMS Variation Summary This set of preferences affects data preparation for both Event List and RMS Summary reports Changes here may affect the number duration and magnitudes of reported RMS variations The PQView Tech Note 97 2 describes RMS variation aggregation Tech Note 97 3
39. one of the four listboxes at the bottom of the screen then click the Report button under that listbox The database will be queried for data matching your selected site s and date time range and a report will be generated Please be patient while your query executes there may be an extensive amount of data needed to generate the graphs and tables in the report When you return to the Reports page after creating and viewing a report the sites and date range you have specified will remain until you change them This feature allows you to generate multiple reports using the same site list and date range without having to reselect the sites and range 2 2 1 Dates and Times All dates and times are local time accounting for Daylight Savings Time on a site by site basis Dates must be entered in the format indicated which is set at the Web server The format options are e Month Day Year Hours Minutes Seconds e Day Month Year Hours Minutes Seconds e Year Month Day Hours Minutes Seconds The time is optional and may include fractional seconds If the time is omitted 0 00 00 is assumed Hours range from 0 to 23 and minutes range from 0 to 59 Years may be entered in 2 digit or 4 digit format Months may be entered as a number from to 12 as a full name or as a three letter abbreviation The From date time must be less than the To date time 2 2 2 Sites in Different Time Zones If the query includes sites that are in different t
40. p to four elements determined by your selections on the RMS Variation Display Preferences page described in section 3 1 e Event List provides access to plots and file downloads of individual RMS variation events e Magnitude Duration Plot each event is plotted on a scatter chart with a reference background curve Electrotek Concepts Inc 18 Queries and Reports e Histogram Table collects individual events into a histogram of counts or rate per magnitude and duration bin e 3D Histogram Plot a bar chart of the histogram data The histogram table and plot vertical axis units will be raw event count unless you have entered a non zero choice for User Rate on the Aggregation Preferences page see section 3 1 With a user rate of 30 days for example the histogram units would then be events per 30 days Choices made on the Monitor Days Preferences section 3 4 page affect this normalization To change this report you can do any or all of the following e Click on the RMS Agg Preferences link at the top of the report Change any of the settings on the RMS Summary Preferences page section 3 5 and click the Save button on that preferences page The report will regenerate automatically using the new preferences e Toggle the option to include steady state records on the Monitor Days Preferences page You can access this preferences page by returning to the Reports page This will affect the denominator monitor days for no
41. rements are stored in single phase components They may be characterized using a hierarchy of aggregation methods e Phase Aggregation the most basic level in which measurement components are aggregated to find the worst component on each phase e Measurement Aggregation the next level in which the worst phase is used e Temporal Aggregation the highest level in which events with small time separation may be aggregated into one event e Aggregation Time allows you to set a time range for collecting measurement components into one aggregate event e Window Type allows the aggregation time to vary depending on the time separation between events e Monitor Days Method no normalization means the RMS variation counts are reported as raw data With normalization the raw counts are multiplied by the monitoring period and divided by the Rate to report counts per month quarter half year or full year Estimated normalization uses the from and to dates of the query to define the monitoring period Exact normalization refines this by eliminating days in which no events or steady state measurements were recorded Also see the Monitor Days Preferences page e Rate choose the number of days 30 90 180 or 365 to normalize the counts in conjunction with the monitoring period as determined from the Monitor Days Method e Worst Case Method controls the selection of the worst component or phase during aggregation e Max V Deviation
42. rmalized indices Then click the Reports button in the RMS Variations section on the Reports page to re generate the RMS Summary report Electrotek Concepts Inc 19 Queries and Reports 2 8 Steady State Report Steady State Trend reports present a timeline of data from any channel that you choose over a specified time range Depending upon the channel the available data my consist of single values or Min Average Max envelopes To create a Steady State report select the channel s using the Trend Channels Preferences page section 3 5 Then select Steady State from the Trends listbox at the bottom of the Reports page and click the Reports button under it An example report is shown in figure 11 Depending on the preferences and channels selected the report may include one or more trend plots vs time as in Figure 11 The report may also include histogram and cumulative probability plots of the steady state samples illustrated in Figure 12 The types of plots that appear trend or histogram and the phase aggregation or superposition on the plots are all set on the Trend Display Preferences page described in section 3 6 PQWeb Steady State Report Trend Plots SITE W 4 10 01 1994 00 00 00 10 05 2000 00 00 00 LMirlMax Avg Envelope 3 phases aggregated A gt 80 V RMS Min V RMS Max V RMS Avg i old O ar lo REUS Uu Sa Pa ae A RMS Voltage kv 5 0 1 May 8 Mon 15 Mon 22 Mon 1 Jun May 95 Local Date and
43. rogram is installed on the server to allow fast configuration of multiple PQView databases and user access groups Electrotek Concepts Inc 3 Overview 12 Other Changes The procedure for implementing multiple PQWeb 2 0 sites on a server given in PQView Tech Note 99 1 is not applicable to PQWeb 2 2 or 3 0 The Web Site Alias information described in PQView Tech Note 99 2 still applies In this version the Web pages for multiple PQWeb sites can all reside in the same physical directory Internet Information Server can be used to create multiple Web applications URLs over the same physical directory but with different user authentication setups This version does not use separate configuration files for each site but based on the user authentication more than one database can be selected from the POWeb entry page Electrotek Concepts Inc 4 Overview 2 User Guide to Queries and Reports This section describes how to use PQWeb from a client browser A sample database is available at http www powermonitoring com pqwebdemo Enter this URL into your browser or use the URL for your company s PQWeb site 2 1 Login to POWeb You may be asked for a password as illustrated in Figure 1 Some PQWeb sites such as the demo URL listed above allow anonymous access with no password After you supply the password if required and PQWeb verifies that your browser accepts cookies the home page appears as in Figure 2 You may need to s
44. s for all waveform and trend plots Also to take full advantage of large computer displays or to view reports on small displays you can customize the size of each image by changing a preference You can even add a caption to each graph Electrotek Concepts Inc 2 Overview Steady State Report We have replaced the Steady State Analysis Wizard of PQWeb 2 0 with a Steady State report that is both easier to use and more flexible The new report creates time trends histograms and statistical summary tables of any voltage current power energy or demand quantity housed in the PQView database The report can be quickly configured using a preference page and configurations are saved as cookies with your computer s web browser This means that once you are satisfied with your steady state report display settings they will be immediately available the next time that you run the report More Steady State Data PQWeb 2 0 could only process up to 10000 data points at a time With PQWeb 3 0 steady state trends could include hundreds of thousands of data points meaning that you can make trend charts that span years Monitor Availability Report A new monitor availability report has been added so that you can determine when your power quality monitors were online without needing to run PQView s Power Quality Data Analyzer ITIC SEMI and IEEE 1346 Curves In addition to offering the CBEMA voltage magnitude versus event duration scatter plot for
45. s illustrated in Figure 13 This report estimates the number of days that PQ monitors were collecting data for each site and month The day begins at midnight 00 00 00 and ends at 23 59 59 If a steady state measurement of any voltage quantity was taken at any time during the day the monitor is considered available on that day If an event trigger transient or RMS variation was recorded at any time during the day the monitor is likewise considered available on that day Preferences Help Result for 4 sites from 04 30 1995 00 00 00 to 06 03 1995 00 00 00 local site time from 04 30 1995 04 00 00 to 06 03 1995 04 00 00 UTC Figure 13 Monitor availability report z Monitor First Last aiti Site Source Month Days Events Measurement Measurement Availability SITE1 April 0 04 30 1995 04 30 1995 100 1995 SITE1 ds 34 31 113 05 01 1995 05 31 1995 100 June SITE1 JUR 2 0 o 0 SITE1 Totals 34 32 113 04 30 1995 05 31 1995 94 SITE2 dl 1 1 0 04 30 1995 04 30 1995 100 SITE2 ode 31 31 133 05 01 1995 05 31 1995 100 June SITE2 iads 2 1 0 06 01 1995 06 01 1995 50 vmm b dm m a an oa an 0n or 2x 00 n zl Note that a trend plot could show an obvious gap in measurements from 18 00 one day to 10 00 the next day Such a gap would not show up on this Monitor Availability report because measurements were taken at some time during both days This report assume
46. s that you expect monitors to be available throughout the queried date range This may result in extra months with zero availability at the beginning or end of the report The summary availability percentage for the site is affected by these empty months so you may wish to run the query again with a tighter date range Electrotek Concepts Inc 25 Queries and Reports 2 9 1 Steady State Records Because of the excessive processing time that would result PQWeb does not unpack steady state records to examine individual monitor days Most PQView databases store steady state trend data in packed weekly records In some cases the record length may be shorter depending on how data was imported Due to the way PQWeb calculates monitor days monitor availability will be overestimated if the monitor was out of service for a few days within a weekly record Typically this overestimate might be 10 Options for dealing with this issue include e Turn off consideration of steady state records on the Monitor Days Preferences page This will probably underestimate the availability e Some newer PQView databases have monitor event records described under the next heading These allow efficient monitor availability calculations with a daily granularity e Accept this level of inaccuracy 2 9 2 Monitor Event Records Some newer PQView databases have monitor event records added for each day that a steady state measurement was taken whether or
47. start at zero e Aggregation e Grouped Trend Values choose whether to plot all phases of a channel on the same or separate graphs e Grouped Trend Min Max A vg choose whether to plot all phases of a channel on the same or separate graphs or to use envelope aggregation With superimposed phases a trend plot would include nine traces for the minimum maximum and average of three Electrotek Concepts Inc 34 Administration phases With envelope aggregation all three phases of a channel will be considered to plot three summary traces for minimum maximum and average e Harmonic Order choose which harmonic to plot for voltage or current spectrum channels see section 2 8 1 e Histogram Plots plot a histogram with superimposed cumulative probability function for measured values minimum maximum and or average e Histogram Bin Size for histogram plots the bin size in volts amps or per unit can be calculated automatically or specified manually e Grouped Histogram choose whether to tabulate all phases of a channel separately or aggregated After you click Save any changes take effect for the next query or graph request Electrotek Concepts Inc 35 Administration 4 Tutorial Examples This section includes step by step instructions for generating three PQWeb reports an Event List an RMS Summary and a Steady StateTrend Report These examples assume that access to the sample PQView database SAMPLE21 has
48. the database they will also be plotted below the RMS Variation plot Electrotek Concepts Inc 14 Queries and Reports PQWeb Event View RMS Variation Phase B RMS Voltage Inst Sag SITE Z 1 05 02 1995 09 39 55 Trigger at 0 on vb RMS RMS Variation SITE Z 1 05 02 1995 09 39 55 E 120 Phase 4 RMS Voltage Phase B RMS Voltage Phase CRMS Voltage 110 gt a a b 100 gt tn 2 ac 390 30 0 0 0 5 1 0 1 5 2 0 25 3 0 Time s Figure 7 RMS variation plot with sub events Electrotek Concepts Inc 15 Queries and Reports 2 6 Graph Zooming and PQDIF Download Most of the graphs in PQWeb may be zoomed These include transient waveforms RMS variation traces and steady state trends A zooming form appears underneath graphs that may be zoomed shown in Figure 9 The first row lets you change the X axis scale used for all graphs The second and subsequent rows let you change the Y axis scale and user comments for individual graphs The graphs are numbered from top to bottom as they appear on the page e X axis Manual Scale turn off the autoscale checkbox and enter the minimum and maximum X axis values for manual scaling The edit fields display the currently plotted minimum and maximum scale values e Y axis Manual Scale s turn off the autoscale checkbox and enter the minimum and maximum Y axis values for manual scaling of a graph The edit fields display the currently plotted minimum and maximum scale
49. the beginning This happens most often when the disturbance is small and very short in duration The reported duration is the entire length of the recording This procedure is carried out for each voltage phase independently without regard to which phase actually caused the original trigger in the meter 2 3 6 Transient Principal Frequency Principal frequency is determined by performing a Fast Fourier Transform computation on the first cycle of transient data following the trigger point The principle frequency is the spectral component with the highest magnitude with the fundamental removed The value is useful for analyzing capacitor switching transients which frequently will demonstrate the same frequency with each energization 2 4 Shortcut Event Lists The Events and RMS Variations listboxes on the Reports page also contains a number of Shortcut reports which quickly return lists of events without performing aggregation In the listbox shortcut reports are designated with an asterisk Shortcut event list reports included in the Events section include e All Events e All RMS Variation Events e All Transient Events e Transients gt 110 e Transients gt 150 e Transients gt 175 e Transients gt 200 Electrotek Concepts Inc 11 Queries and Reports Shortcut event list reports included in the RMS Variations section include e All RMS Variation Events e RMS Variation Events gt 120 e RMS Variation Events gt 110
50. trademark has been added to the bottom right corner of every graph An option has been added to display the event number at the bottom left corner of Event Report graphs An option has been added to the Trend preferences for automatically setting the y axis minimum to zero When plotting Envelope min max avg trends the Average curve is plotted with a thicker line than the minimum and maximum curves Steady state trend plots which aggregate data from multiple sites can now be created For Current and Power channels the data from the multiple sites is summed For other channels such as Voltage the data is averaged The Trend Preferences page now includes options for performing time aggregation of steady state data in order to smooth the curves and enhance longer term trends in the data plots The Trend Preferences page now includes an option to allow plotting of minimum average or maximum curves individually Improvements and changes in PQWeb version 2 2 Faster Because PQWeb 3 0 uses OLEDB to access Microsoft Access and Microsoft SQL Server databases it runs queries significantly faster than PQWeb 2 0 which used DAO Multiple Phase Plots With version 2 2 PQWeb can now display more than one phase on each plot This allows you to create waveform rms voltage variation and trend graphs that show single or three phases You can even combine voltage and current on one chart Online Graph Zooming You can now rescale the axe
51. upply a domain along with your user name in the format domain username Enter Network Password EE gt Please type your user name and password Site tomm Realm tomm User Name ftomm Password Save this password in your password list Cancel Figure 1 Enter a password to access the PQView database Electrotek Concepts Inc 5 Queries and Reports ELECTROTEK CONCEPTS PQWeb 3 0 PQWebS is a browser based tool for viewing power quality data from POView databases Welcome FELIX Administrator Select a database Sample21 Continue N You may download files in the Power Quality Data Interchange Format PQDIF for additional offline plotting and post processing A PQDIF viewer is available as a free download from www pqsoft com top Version 5 00 01 or later is required POView and PQWeb are registered trademarks of Electrotek Concepts Inc and are part of the EPRI Power Quality Diagnostic System EPRI is a registered trademark of EPRI gt Figure 2 PQWeb home page If the site contains more than one PQView database you should select one from the combo box in the center of the entry page shown in Figure 2 If this combo box does not appear the site may only have one database to choose from or your password may allow access to only one database Secured PQWeb sites may limit user access to databases measurement sites and PQWeb functionality After choosing a database cl
52. values Note that if stacked axes or stacked graph preferences are in effect the manual scale applies to all such axes in the graph The Y axis manual scale works best with the separate or superimposed graph preferences e User Comment s enter an optional subtitle for each graph The edit fields display any current user comments for each graph Depending on graph preferences this comment appears as a subtitle either above or below the plot area If you make preference changes such that the number of graphs in the re generated report will change then any mismatched custom Y axis zooms and user comments will be used in the order entered Graph Customization Graph Autoscale Min Max Comment up to 48 Characters All X Axis o fi 0 1 a Inst M Y Axis 200 200 Zoomed on the Trigger F200 200 Regenerate Graphs 2 Ia Inst M Y Axis PODIF Download Figure 8 Graph zooming form After making changes as shown in Figure 8 the transient plot from Figure 6 is zoomed and subtitled as shown in Figure 9 Electrotek Concepts Inc 16 Queries and Reports Transient SITE Z 1 05 02 1995 09 39 54 Zoomed onthe Trigger A Phase A Instantaneous Voltage Phase B Instantaneous Voltage Lnd 200 Phase C Instantaneous Voltage Residual Instantaneous Voltage 100 Instantaneous Voltage V e 100 200 Time ms Figure 9 Zoomed transient graph with a custom label You
53. velope trend plots there will typically be 9 color coded traces one for the min max and average of each phase With aggregated envelope plots there will always be 3 traces one for the min max and average of the aggregated phases In this case the minimum will be the lowest minimum value among all phases the maximum will the highest maximum value among all phases and the average will be the weighted average of the phase average values The histogram grouping options for two or three phases are similar to the separate vs aggregated option for envelope trend plots With the separate option each phase will have a separate histogram With the aggregated option all phases for a channel will be combined into one histogram 2 8 4 Steady State Trend Zooming The Trend Graph Customization options appear in a table below the last trend graph The appearance and operation of this form is similar to that shown in Figure 8 The difference for trends is that you enter min and max dates for the X axis in the same format used for the query page The first row lets you change the X axis date and time scale used for all trend graphs The second and subsequent rows let you change the Y axis scale and user comments for individual trend graphs The trend graphs are numbered from top to bottom as they appear on the page e X axis Manual Scale turn off the autoscale checkbox and enter the minimum and maximum X axis date and time values for manual scalin
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