Hitachi Relion 670 Series Commissioning Manual page 224

Section 11
Testing functionality by secondary injection
5. Check that the other zones operate according to their zone timer and that the send (CS) signal is
obtained only for the zones that are configured to give the actual signal. Also the zone connected to
CS underreach is giving CS in this mode.
6. Deactivate the IED receive (CR) signal.
7. Apply healthy normal load conditions to the IED for at least two seconds.
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.
11.11.1.4 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 trip time complies with the tCoord timer (plus relay measuring time).
5. Check that the other zones trip 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.
11.11.1.5 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 trip time complies with the tCoord timer (plus relay measuring time).
5. Check that the other zones trip 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.
11.11.1.6 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
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Line distance protection REL670
Commissioning manual