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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 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.
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 of zone 1.
4.
Prepare a transient fault sequence.
5.
Simulate the condition for the synchro-check as for live bus
and dead line.
6.
Energise the protection terminal and evaluate the result i.e.
• Check that correct trip has been accomplished according to con-
figuration and philosophy.
• Check that the autoreclosure have made an reclosing of the pro-
tected object.
• Check that activation of all other external devices have been ac-
complished according to configuration and protection philoso-
phy.
- Check, whenever applicable, that carrier receive signal has
arrived at remote end.
- Check, whenever applicable, that start of external disturbance
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.
7.
Make a new fault case for permanent fault and repeat the pro-
cedure 1 - 6 above.
Specially note that a permanent trip should occur after the last at-
tempt according to the programming of the AR.
Chapter 13
Testing the protection system
109
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