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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 equipment. Make sure that involved
personnel is informed also in remote station.
This procedure describes how to test the interaction of an overcurrent protection stage at a tran-
sient 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 equipment. Make sure that
involved personnel is informed also in remote station.
Procedure
1.
Make sure that the protection terminal and related 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 configu-
ration and philosophy.
•
Check that the autoreclosure have made an reclosing of the protected
object.
•
Check that activation of all other external devices have been accom-
plished according to configuration and protection philosophy.
-
Check, whenever applicable, that carrier receive signal has ar-
rived 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 steps
above.
Specially note that a permanent trip should occur after the last attempt ac-
cording to the programming of the AR.
It is recommended to repeat the procedure
which detects earth-faults i.e. residual overcurrent protection.
Testing the protection system
1
1
-
6
for a protection function
Chapter 15
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6
165
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