Relay protection type

Test items

Suggested test module

Remark

Line protection

Multistage

Over /(under) voltage

Sequence component voltage and current

Frequency device

Power direction protection

Reclosing and conversion fault

Corresponding test item

Complete set test, line protection, state series, 6-35KV line protection integrated test

It's required to test the synchronization check and no-voltage check and use Ux as the voltage output of connected side while the 1200 tester uses Ua instead of Ux for test.

Distance and zero sequence

Distance and zero sequence fixed value verification

Distance and zero sequence, line protection, complete set test, AC test

Both "distance and zero sequence" and "line protection" can automatically simultaneously test the distance and zero sequence fixed value of multiple stages, various fault types and various phases.

Impedance characteristics

Impedance characteristics

Power frequency variation impedance

Fixed value verification

Distance and zero sequence, line protection

10~15A

The fault current should be large enough such as 10-15A (in the case of CT of 5A system)

Overcurrent protection of composite voltage blocking (direction)

Overcurrent, low voltage, negative sequence voltage, angle of sensitivity, etc

AC test, 6-35KV line protection integrated test

The "low voltage" and "negative sequence voltage" under protection will be input from different terminals and the wiring needs to be changed at test

Low cycle, low voltage deloading device

Corresponding test item

Frequency and high and low cycle, 6-35KV line protection integrated test

If other conditions are all met but the device still fails to operate, please confirm whether the device needs current input and switch contact at the same time

Generator protection

Differential protection

Proportion braking characteristics

Differential protection, differential fixed value, AC test

As to generator differential protection, when testing with the "differential protection", it can be seen as power transformer protection with the wiring type as Y/Y and the high and low voltage side balance coefficient as 1

"Differential protection" focuses on curve characteristics search, while "differential fixed value" module focuses on differential fixed value test and the combination of both provides a comprehensive test of differential protection

Harmonic braking characteristics

Differential protection, differential fixed value, AC test

Field loss protection

Corresponding test item

AC test

Attention should be paid to the angle of output voltage and current in the test.

Excitation protection

Overcurrent protection of composite voltage blocking (direction) (reserve)

Corresponding test item

Please refer to the above "line protection" section

Please refer to the above "line protection" section

Other protection

Automatic synchronized device

Corresponding test item

Synchronization test

When the automatic adjustment test is conducted, wiring shall be made according to the manual for each switch input test

Bus differential protection

Corresponding test item

AC test

Please refer to the instructions on BP-2B and RCS-915 in "NARI Part Protection" of Appendix 6

Line differential protection

First determine whether the device forms "self-loop" before test. If so, the protection operating value should be equal to half of its setting value