
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.
11.11.1.4
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.
Section 11
1MRK 504 165-UUS -
Testing functionality by secondary injection
260
Transformer protection RET670 2.2 ANSI
Commissioning manual
Summary of Contents for RELION RET670
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