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Check the scheme logic during the secondary injection test of the impedance or overcurrent
protection functions.
Activation of the different zones verifies that the CS signal is issued from the intended zones. The CS
signal from the independent tripping zone must have a
tSendMin
minimum time.
Check the tripping function by activating the CR and CRG inputs with the overreaching zone used to
achieve the CACC signal.
It is sufficient to activate the zones with only one type of fault with the secondary injection.
10.10.1.1
Testing permissive underreaching
M13868-10 v4
1.
Activate the receive (CR) signal in the IED.
2.
Apply healthy normal load conditions to the IED for at least two seconds.
3.
Apply a fault condition within the permissive zone.
4.
Check that correct trip outputs, external signals, and indications are obtained for the actual type
of fault generated.
5.
Check that other zones operate according to their zone timers and that the send (CS) signal is
obtained only for the zone configured to generate the actual signal.
6.
Deactivate the receive (CR) signal in the IED.
7.
Check that the 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.
10.10.1.2
Testing permissive overreaching
M13868-28 v4
1.
Activate the receive (CR) signal in the IED.
2.
Apply healthy normal load conditions to the IED for at least two seconds.
3.
Apply a fault condition within the permissive zone.
4.
Check that correct trip outputs, external signals, and indication are obtained for the actual type
of fault generated.
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.
10.10.1.3
Testing blocking scheme
M13868-50 v5
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 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 send (CS) signal is
only obtained for the reverse zone.
6.
Activate the IED receive (CR) signal.
Section 10
1MRK 506 377-UEN Rev. K
Testing functionality by secondary injection
132
Railway application RER670
Commissioning manual
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