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1MRK 504 165-UEN Rev. K
11.12.1.4
Testing 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.
Activate the IED receive (CR) signal.
7.
Apply a fault condition in the forward directed zone used for scheme communication tripping.
8.
Check that the no trip from scheme communication occurs.
9.
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.
11.12.1.5
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.
11.12.1.6
Checking of unblocking logic
Check the unblocking function (if the function is required) when checking the communication
scheme.
Command function with continuous unblocking (Unblock = 1)
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.
11.12.1.7
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
Transformer protection RET670
Commissioning manual
© 2017 - 2022 Hitachi Energy. All rights reserved
Section 11
Testing functionality by secondary injection
GUID-D5FF46AF-0C5A-4AD4-8F2C-09EC17B681F1 v2
M13868-50 v5
M13868-72 v4
M13868-76 v6
M13868-84 v6
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