ABB Relion 670 Series Commissioning Manual page 139

1MRK 506 377-UEN Rev. K
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.
10.10.1.4 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.
10.10.1.5 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.
10.10.2 Current reversal and Weak-end infeed logic for distance
protection 2-phase ZCRWPSCH
Prepare the IED for verification of settings outlined in Section
Values of the logical signals for ZCRWPSCH are available on the local HMI under Main menu/Tests/
Function status / Scheme communication / ZCRWPSCH(85) /ZCRWPSCH:1.
The Signal Monitoring in PCM600 shows signals that are available on the Local HMI.
The current reversal logic and the weak-end infeed functions are tested during the secondary-
injection test of the impedance or overcurrent protection zones together with the scheme
communication logic for the distance protection function ZCPSCH.
10.10.2.1 Current reversal logic
It is possible to check the delay of the CS send signal with tDelayRev by changing from a reverse to
a forward fault.
By continuously activating the CR input and changing from a reverse to a forward fault, the delay
tDelayRev can be checked.
Checking of current reversal
Railway application RER670
Commissioning manual
The reverse zone timer must not operate before the forward zone fault is applied.
The user might need to block the reverse zone timer setting during testing of current
reversal.
The forward zone timer must be set longer than the tDelayRev set value.
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Testing functionality by secondary injection
GUID-732B11C3-603F-4159-B46E-D4188EF71DA5 v1
"Preparing the IED to verify
Section 10
M13868-72 v4
M13868-76 v6
M13868-84 v6
settings".
M14947-8 v3
M14947-13 v9
133