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Document Number: ECP 11-0212 Date: 30/01/2017 ELECTROMAGNETIC VOLTAGE TRANSFORMER TEST FORM Substation Name Substation Number Circuit Project Number MPAN(S) Voltage Transformer L1 L2 L3 VT Group Function Location Serial Number Burden VA VA VA Available Ratios V V V Ratio Selected V V V () () () Accuracy Class Make Type Calibration Certificates Attached General Checks Prove tightness of all fastenings All insulators are undamaged and clean Earth strap connection Gaps of arcing horns or rings Labelling Tank oil level * Bushing oil level * Dehydrating breather * Venting of oil filled compartments * Oil tightness of gaskets Check pressure relief diaphragm * Terminal box venting and sealing * Not applicable to sealed type VTs. L1 L2 L3 THIS IS AN UNCONTROLLED DOCUMENT, THE READER MUST CONFIRM ITS VALIDITY BEFORE USE Version: 3.0 Electromagnetic Voltage Transformer Test Form Document Number: ECP 11-0212 Version: 3.0 Date: 30/01/2017 VT Oil Test L1 L2 L3 L1 L2 L3 L1 L2 L3 L1 L2 L3 VT Secondary Circuit Fuses Functions and Ratings L1 L2 L3 VT Buchholz Relay L1 L2 L3 L1 L2 L3 Samples from top and bottom of tank tested to maintenance manual Top Bottom VT Insulation Resistance Measure and record the insulation resistance at 1kV to earth Secondary winding 1 to earth Secondary winding 2 to earth Secondary winding 1 to secondary winding 2 VT HV Winding Continuity Continuity checked DC resistance at 20° to be checked against manufacturers figures when bushing is installed on site VT Secondary Links and Fuses Prove secondary winding earth-link Check for correct mounting Check operation by air or oil injection against test card VT Vacuum Maintained at 20 in of mercury for minimum period of 6 hours to remove all occluded air (applicable only where complete oil filling of the VT occurs at site) VT Ratio and Phasing Isolate VT and apply ac voltage to the HV terminals of the VT and measure the voltages at the LV terminals © UK Power Networks 2017 All rights reserved 2 of 4 Electromagnetic Voltage Transformer Test Form Document Number: ECP 11-0212 Version: 3.0 Date: 30/01/2017 HV Winding Primary Voltage L1-L2 (or L1-N) V L2-L3 (or L2-N) V L3-L1 (or L3-N) V Secondary Voltage L1-L2 (or L1-N) L2-L3 (or L2-N) V ½V (or 0V) ½V (or 0V) ½V (or 0V) V V L3-L1 (or L3-N) V V ½V (or 0V) VT Secondary Output Tests V ½V (or 0V) V ½V (or 0V) V V L1 L2 L3 L1 L2 L3 Secondary output voltage (measured at the various secondary-fuse outlets with the VT alive at primary system voltage) Primary system voltage during test (if value available) VT Phasing Tests Voltages measured between the output terminals L1, L2 and L3 of the VT under test, and the output terminals L1r, L2r and L3r of a reference VT of known phasing Phases L1r L2r L3r Phasing tests carried out with respect to VTs of known phasing on circuit © UK Power Networks 2017 All rights reserved 3 of 4 Electromagnetic Voltage Transformer Test Form Document Number: ECP 11-0212 Version: 3.0 Date: 30/01/2017 Comments Test Equipment Purpose Make/Type Serial Number Certification () All tests have been completed satisfactorily Contractor Commissioning Engineer (if applicable) Organisation Name Date Signature UK Power Networks Commissioning Engineer Name © UK Power Networks 2017 All rights reserved Signature Date 4 of 4