1.
Make sure that
TripLockout
and
AutoLock
are both set to
Disabled
.
2.
Initiate different single-phase-to-ground faults one at a time.
Single-phase tripping will only be allowed when an auto-reclose attempt will follow.
Autorecloser STBRREC (79) has functionality such as the long trip time, CB ready
and so on, which can prevent a proper single-phase tripping and auto reclose. To
bypass this problem the fault initiation should be with a test set and with the auto
reclose in full service with a test set connected to the distance protection function.
Consider using an adequate time interval between faults, to overcome a reclaim time
of which is activated by the autorecloser function. Only a single-phase trip should
occur for each separate fault and only one of the trip outputs (TR_A, TR_B, TR_C)
should be activated at a time. Functional outputs TRIP and TR1P should be active
during each fault. No other outputs should be active.
3.
Initiate different phase-to-phase and three-phase faults.
Consider using an adequate time interval between faults, to overcome a reclaim time
which is activated by the STBRREC (79) function. A three-phase trip should occur
for each separate fault and all of the trips. Functional outputs TRIP, all TR_A, TR_B,
TR_C and TR3P should be active at each fault. No other outputs should be active.
4.
Initiate a single-phase-to-ground fault and switch it off immediately when the trip
signal is issued for the corresponding phase.
5.
Initiate the same fault once again within the reclaim time of the used autorecloser
function.
A single-phase fault shall be given at the first fault. A three-phase trip must be
initiated for the second fault. Check that the corresponding trip signals appear after
both faults. Functional outputs TRIP, TR_A, TR_B, TR_C and TR1P should be
active during first fault. No other outputs should be active. Functional outputs TRIP,
all TR_A, TR_B, TR_C and TR3P should be active during second fault.
6.
Initiate a single-phase-to-ground fault and switch it off immediately when the trip
signal is issued for the corresponding phase.
7.
Initiate the second single-phase-to-ground fault in one of the remaining phases.
This shall be within the time interval, shorter than
tEvolvingFault
(default setting 2.0
s) and shorter than the dead-time of the autoreclose function, when included in the
protection scheme. Check that the second trip is a three-phase trip and that a three-
phase autoreclosing attempt is given after the three-phase dead time. Functional
outputs TRIP, TR_A, TR_B, TR_C and TR1P should be active during first fault. No
other outputs should be active. Functional outputs TRIP, all TR_A, TR_B, TR_C
and TR3P should be active during second fault.
6.8.2.2
Circuit breaker lockout
The following tests should be carried out when the built-in lockout function is used in
addition to possible other tests, which depends on the complete configuration of an IED.
Section 6
1MRK 505 293-UUS A
Testing functionality
114
Commissioning manual
