Cast Resin Transformer User Manual
Contents
1. TAE BER fo SRA S Shihlin Electric amp Engineering Corporation EEA kemak LENE Cast Resin Transformer User Manual 1 This manual includes the handling installation connection operation and maintenance of cast resin transformers up to 36kV 2 Hope you can fully understand and apply its superior performance so that our products can make the best effort The information contained herein is the exclusive property of SEEC and shall not be distributed reproduced or disclosed in whole or in part without prior written permission of SEEC EYJOO26A Contents Ry PO a a w Re seeiiceesaresesace II Installation eee eee BY SOU Glasanercinen V Insulation Distance VI Commissioning cccccceeeees VII Short time Overload VITI Maintenance s IX Regular Inspections EYJO026A I Features LV terminal Core Upper Nameplate cas LV Coil HV terminal HV coil HV connection bar Tappings Cross flow Wedge l ean Coil supporter N m m ARIS Asesinas alacant Lower Je ee hy f _ 1E Wheel Raae optional Note Illustration only components may be varied on demands l EYJ0026A II Handling 1 Use appropriate slings and hooks to lift cast resin transformers 2 All lifting lugs should be occupied and angles between slings or chains must less than 60 degrees to ensure safe lifting 3 Every hasty lifting act2. temperature Overload Unload check capacity rising Record temperature Temperature ne in windings Winding inner fault Find causes and strategies Core exiting Over voltage Proper tap changer noise Rectification device Customized transformer Vibrating Oscillation Remove oscillation Noise or Abnormal noise oscillating noise Uneven placing Adjust placing ib ti vibration checking Loosen bolts and Tighten bolts prevent core Core bee sound Screws gaps Discharging Incomplete earthing Earthing maintenance couse Find causes and strategies Stink detecting temperature rising Partial overheated Find causes and strategies i Overload Unload ee Color changed Overoad ntowt terminals and tap due to overheat l changers Loosen bolts Tighten bolts R l Stained Uncleaned Dusting inspection Core and coil i l Unusua l appearance Resin cracks Find causes and strategies temperature varies Discharging track Insulation Abnormal voltage pene 8 Find causes and strategies detecting carbonized invading Note 1 The above are visional inspection if any strategy is proceeding be de energized to keep maintenance staff from danger 2 If any abnormal phenomenon appears and not be able to find causes and strategies please contact our sales department We will provide technical support or local staff service 9 EYJ0026A IX Regular Inspections Insulator aging cracking Winding Aging Discharging track
3. e same tapping in series or parallel connection 2 Confirm tapping links on the coil and the diagram on the nameplate 3 Connection tightening torque on the HV LV terminal and tapping links ee e cm 125 kef cm 250 kef cm 450 kgf Tapping links 80 kgf cm 150 kgf cm a 4 Select appropriate wire dimension and connection for earthing 4 EYJO026A 5 HV Tap changer connections should be at de energized off circuit 1 HV rated voltage alternative 22800 11400V Series 13 14 Parallel 16 13 14 15 2 res 2a ramon l 59 23 eno HV rated voltage Tap3 V HV rated voltage Tap3 V 7 8 1 2 2 3 Tap 2 9 10 3 4 10 11 5 a res HV Voltage 5 EYJ0026A V Insulation Distance 1 The minimum clearance between cables and the surface of winding is shown in the following figure UL LV HV i nt arii 120mm 120mm minimum a minimum 2 The transformer in metal enclosure must be protected against direct contact Maintain minimum clearance to the walls according to the following table N N N gree excess eter PEN Fa l PEE el man aee foot ooo oo coo N System Impulse Insulation 7 Voltage Voltage distance kV kV LEELLELLEL 2 Ea X NE SE ON EYJOO26A VI Commissioning 1 Insulation test 1 Using a 1000V 2000MQ above insulation tester Megger ii The approximate values of resis
4. ion is prohibited to avoid crashing risks x Wrong O Correct 2 lifting lugs occupied only 4 lifting lugs occupied or slings angle 0 gt 60 and slings angle 0 lt 60 4 Handling plenty of transformers timber planks are suggested as spacers between lower frames to avoid collision 5 Trussing transformers up the area contacting to slings should be protected by cloth or similar material 6 Lifting with a fork settle forks firmly under the bottom of lower frames keep low speed steadily prohibit risky driving such like sudden accelerating or braking 2 EYJO026A III Installation 1 Altitude The transformer should not be installed above 1000 meters 3300 feet a higher altitude is specified at the time of enquiry 2 Ambient temperature Daily average 30 C Yearly average 20 C 3 Maximal special ambient temperatures higher than 40 C Permissible load temperature 45C 0 97 x P 0 90 x P 55 C 4 Indoor installation in electrical operating rooms or in various sheet metal enclosures is the preferred method of installation Sufficient ventilation must be provided by the installation location or the enclosure In the general case of natural cooling a total loss of 1kW needs a 3 m min air flow to ventilate 3 EYJO026A IV Connection 1 Verify the position identify of tapping links on the three phases are in accordance with the diagram on the nameplate Make sure that each phase selects th
5. or Insulation carbide attached Contact aging manufactor Insulation Dusting Behind specific Measurement P Stained Stain observing Antirust 155 C material aging thermal paint Connection Color changed inspection due to overheat Loose Fasten with connection proper torque Tap links Thermometer Protective Indicating state Poor performance Device Repair or replacement Note 1 Annual off load inspection is proposed 2 If any abnormal phenomenon appears and not be able to find causes and strategies please contact our sales department We will provide technical support or local staff service 10 EYJO026A
6. tances based on 25 C are Insulation resistance n If the values measured are significantly HV to LV 250 MQ below verify the transformer is not moist HV to earth 250 MO If it is dry it with a rag and repeat the verification LV to earth 50 MQ 2 Parallel operation Verify the identity of HV and LV voltages phase angle difference vector group and the compatibility of characteristics especially the impedance voltage If the impedance voltages are various verify load distribution of each transformer 7 EYJO026A VII Short time Overload Acceptable temporary overload curves of various ambient temperature and initial load condition for cast resin transformers Ambient temperature Admissible temporary Acceptable short time condition overload for daily load cycle overload of rated power rated current multiple 0 8 intial load ratio WOA 10 m 8 Normal ambient temperature 10 C l l CT of rated power Normal ambient temperature initial load ratio Mimaximum 40 C Midaily average 30 C Mi yearly average 20 C rated current multiple 10 ee initial load ratio Normal ambient temperature 10 C 8 EYJO026A Vill Maintenance Abnormal circuit Repair or replacement Observe and record P P voltage current and apes on ambient temperature indicating Measuring fault Find causes and strategies Operation Unusual State Poor instruments Repair or replacement Unusual
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