ABB REL 551 2.3 Series - Page 139

133
Testing the interaction of the distance
protection
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This procedure describes how to test the interaction of distance protection zone 1 at a
transient phase L1-L2 fault in forward direction. The test must be done without the test
switch in order to verify the interaction between the terminal and surrounding equip-
ment. Make sure that involved 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 the autoreclosure have made an reclosing of the
protected object.
• Check that activation of all other external devices have been
accomplished according to configuration and protection phi-
losophy.
- Check, whenever applicable, that carrier receive signal has
arrived at remote end.
- Check, whenever applicable, that start of external distur-
bance recorder has been accomplished.
- Check that event and alarm signals has been given etc.
• Check that no abnormal events have occurred.
• Notice the AR dead time and do corrections if needed.
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Specially note that a permanent trip should occur after the last at-
tempt according to the programming of the AR.
It is recommended to repeat the procedure 1
- 6 for a protection
function which detects earth-faults i.e. residual overcurrent protec-
tion.