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2
Testing the interaction of the distance
protection
Testing the interaction of the distance protection
This procedure describes how to test the interaction of the distance protection zone 1 at phase
L1-earth fault in forward direction. It is recommended that all other distance protection zones
and other protection functions are tested in a similar way. The test must be done without the test
switch in order to verify the interaction between the terminal and surrounding equipment. Make
sure that all personnel is informed, also in remote station.
Procedure
1.
Make sure that the protection terminal and fitting breaker(s) to be
tested are in service.
2.
Connect the test equipment to the terminal.
3.
Set the test equipment so that the impedance present to the relay is
half the set value.
4.
Energise the protection terminal and evaluate the result i.e.
•
Check that correct trip has been accomplished according to configu-
ration and philosophy.
•
Check that all binary output signals that should be activated have
been activated.
•
Check that all other protection functions that should be activated by
this type of fault have been activated.
•
Check that no other protection functions that should not be activated
have not been activated.
•
Check whenever applicable that the disturbance report, event list and
disturbance recorder have been activated and performed correct in-
formation.
Verifying the internal configuration
Chapter 14
161
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