Checking Of Unblocking Logic; Completing The Test; Current Reversal And Weak-End Infeed Logic For Distance Protection 3-Phase Zcrwpsch; Function Revision History - Hitachi Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
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.
11.11.1.6

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.
11.11.1.7

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.
11.11.2 Current reversal and Weak-end infeed logic for distance
protection 3-phase ZCRWPSCH
Prepare the IED for verification of settings as outlined in section
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.
11.11.2.1

Function revision history

Document
revision
B
C
D
E
F
G
Table continues on next page
180
"Preparing for test" in this chapter.
Product History
revision
2.2.1 -
2.2.2 -
2.2.2
2.2.2 -
2.2.3 -
2.2.3 -
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