ABB REL670 Installation And Commissioning Manual page 157

12.1.3
12.1.4
Scheme communication
5. Check that the other zones operate according to their zone timer and
that the carrier send (CS) signal is obtained only for the zones that
are configured to give the actual signal.
6. Deactivate the IED carrier receive (CR) signal.
7. Apply healthy normal load conditions to the IED for at least two sec-
onds.
8. Apply a fault condition within the permissive zone.
9. Check that trip time complies with the zone timers and that correct
trip outputs, external signals, and indications are obtained for the
actual type of fault generated.
Testing blocking scheme
Procedure
1. Deactivate the carrier receive (CR) signal of the IED.
2. Apply healthy normal load conditions to the IED for at least two sec-
onds.
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 carrier send (CS) signal is only obtained for the reverse zone.
6. Activate the IED carrier 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 ob-
tained for the actual type of fault generated.
Checking of unblocking logic
Check the unblocking function (if the function is required) when you check the communication
scheme.
Command function with continuous unblocking (Unblock = 1).
Procedure
1. Activate the carrier guard input signal (CRG) of the IED.
2. Using the scheme selected, check that a carrier accelerated trip
(TRIP) is obtained when the carrier guard signal is deactivated.
Chapter 11
Verifying settings by secondary
injection
149