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Section 10
Testing functionality by secondary injection
10.11.1.4
10.11.1.5
10.11.1.6
212
Testing delta blocking scheme
1.
Deactivate the receive (CR) signal of the IED.
2.
Apply healthy normal load conditions to the IED for at least two seconds.
3.
Apply a fault condition within the forward directed zone used for scheme
communication tripping.
4.
Check that correct trip outputs and external signals are obtained for the type of
fault generated and that the operate time complies with the tCoord timer (plus
relay measuring time).
5.
Check that the other zones operate according to their zone times and that a send
(CS) signal is only obtained for the reverse zone.
6.
Check that for a forward fault, carrier send (CS) signal is first obtained from the
delta based fault inception detection (as it is not directional) , and immediately
inhibited by the forward zone.
7.
Activate the IED receive (CR) signal.
8.
Apply a fault condition in the forward directed zone used for scheme
communication tripping.
9.
Check that the no trip from scheme communication occurs.
10. Check that the trip time from the forward directed zone used for scheme
communication tripping complies with the zone timer and that correct trip
outputs, external signals, and indications are obtained for the actual type of fault
generated.
Checking of unblocking logic
Check the unblocking function (if the function is required) when checking the
communication scheme.
Command function with continuous unblocking (
Procedure
1.
Activate the guard input signal (CRG) of the IED.
2.
Using the scheme selected, check that a signal accelerated trip (TRIP) is
obtained when the guard signal is deactivated.
Completing the test
Continue to test another function or end the test by changing the TestMode setting to
Off. Restore connections and settings to their original values, if they were changed for
testing purposes.
1MRK 506 355-UEN A
Unblock = 1 )
Line distance protection REL670 2.1 IEC
Commissioning manual
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