Download ECP 11-0212 Electromagnetic Voltage Transformer Test Form

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