Voltage Transformer Test Classification: A Complete Guide for Electrical Engineers

Classification of Voltage Transformer Tests: -
Type Tests: The following shall constitute the type tests:
a) Temperature rise test
b) Lightning impulse test for voltage transformers for service in electrically exposed installation.
c) Switching impulse voltage tests for voltage transformers of 420 kV and above
d) High voltage power frequency wet withstands voltage tests on outdoor voltage transformers up to and including 245 kV
e) Determination of errors or other characteristics according to the requirements of the appropriate designation or accuracy class
Routine Tests: The following shall constitute the routine tests
a) Verification of terminal marking and polarity
b) Power frequency dry withstand tests on primary windings
c) Power frequency dry withstand tests on secondary windings
d) Partial discharge measurement in accordance with IS 11322: 1985.
e) Determination of errors or other characteristics according to the
requirements of the appropriate designation or accuracy class
Optional Tests
The following tests, where applicable, shall be carried out by mutual agreement
between the purchaser and the manufacturer:
a) Chopped lighting impulse test as a type test
b) Short circuit withstand capability test as a type test
c) Commissioning test on non-earthed voltage transformers of up to and including 36 kV.