ABB RER670 - Page 99

Testing the phase selection element
Compensated earthed system
GUID-EDEFABCD-3FF3-4270-A1F2-6C820A7F77F9 v1
1. Create phase-to-earth fault as described in phase-to-earth fault in
compensated/high impedance earthed system. Distance measuring loops L1E
and L2E based on underimpedance starting will be blocked for measurement
for a duration of tI01.
2. If a current magnitude is injected in a phase greater than I01 set value,
respective distance measuring loops L1E and L2E will be released for
measurement. The output STCND would become 1 or 2.
3. Phase-to-phase loop L1L2 will be released for measurement if there is any
start signal from underimpedance starting and no start signal from residual
overcurrent start. The output STCND would become 4.
4. Create a fault so that there is no pick-up from underimpedance starting
element and pick-up from residual overcurrent start. Set ModeStubLine to
Off.
5. Measuring loop L1E will be released for distance measurement after set delay
of tI0 sec if magnitude of phase L1 is above KI times magnitude of phase L2
and ModePhSelKI set to Off. Repeat the same by injecting the current in
phase L2. The output STCND would become 1 or 2.
6. Create a fault so that there is no pick-up from underimpedance starting
element and pick-up from residual overcurrent start after a delay time of tI0.
Set ModePhSelKI to On.
7. Difference between the two phase currents must be less than I0MinPhSel
value in order to release either PE loops or PP loop for distance measurement
based on mode of setting ModeI0StRel. The output STCND would become 3
or 4.
Solidly earthed system
GUID-5DEC7D87-6C8B-463E-9204-F834881380CD v1
1. Create a phase-to-earth fault as described in phase-to-earth fault in solidly
earthed system.
2. Distance measuring loops L1E and L2E will be released if there were
respective start signals from L1E and L2E loops of underimpedance starting
element and residual overcurrent start. The output STCND would become 1
or 2.
3. Create a phase-to-phase fault as described in phase-to-phase fault in solidly
earthed system.
4. Distance measuring loop L1L2 will be released if there is start output from
phase-to-phase loop of underimpedance start and no start output from residual
overcurrent start. The output STCND would become 4.
5. Three measuring loops will be released for distance measurement after
delayed start output from residual overcurrent start by tI0 sec if there were no
start output from underimpedance starting and ModeStubLine set to Off. The
output STCND would become 7.
1MRK 506 377-UEN C Section 10
Testing functionality by secondary injection
Railway application RER670 2.2 IEC 93
Commissioning manual