ABB REL 551 2.3 Series - Page 135

129
Testing the interaction of the distance
protection
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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 pro-
tection 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.
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• Check that correct trip has been accomplished according to
configuration and philosophy.
• Check that all binary output signals that should be activated
have been activated.
• Check that all other protection functions that should be activat-
ed by this type of fault have been activated.
• Check that no other protection functions that should not be ac-
tivated have not been activated.
• Check whenever applicable that the disturbance report, event
list and disturbance recorder have been activated and per-
formed correct information.