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 schemecommunication tripping.4. Check that correct trip outputs and external signals are obtained for the typeof 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 asend (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 schemecommunication tripping.8. Check that the no trip from scheme communication occurs.9. Check that the trip time from the forward directed zone used for schemecommunication tripping complies with the zone timer and that correct tripoutputs, external signals, and indications are obtained for the actual type offault generated.11.11.1.4 Testing delta blocking scheme GUID-D5FF46AF-0C5A-4AD4-8F2C-09EC17B681F1 v21. 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 schemecommunication tripping.4. Check that correct trip outputs and external signals are obtained for the typeof 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 asend (CS) signal is only obtained for the reverse zone.6. Check that for a forward fault, carrier send (CS) signal is first obtained fromthe delta based fault inception detection (as it is not directional) , andimmediately inhibited by the forward zone.7. Activate the IED receive (CR) signal.8. Apply a fault condition in the forward directed zone used for schemecommunication tripping.9. Check that the no trip from scheme communication occurs.10. Check that the trip time from the forward directed zone used for schemecommunication tripping complies with the zone timer and that correct tripoutputs, external signals, and indications are obtained for the actual type offault generated.11.11.1.5 Checking of unblocking logic M13868-72 v4Check the unblocking function (if the function is required) when checking thecommunication scheme.Section 11 1MRK 505 378-UEN ATesting functionality by secondary injection238 Line differential protection RED670 2.2 IECCommissioning manual
