High impedance earthed system
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1. Create a phase-to-earth fault as described in phase-to-earth fault in
compensated/high impedance earthed system. Distance measuring loops L1E
and L2E will be released for measurement based on respective start outputs
from underimpedance starting and also presence of residual overcurrent start.
The output STCND would be 1 or 2.
2. 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.
3. 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 be 7.
4. Create a fault so that neutral voltage (UL1+UL2) is measured and if it
exceeds set U0DetMin value, loops L1E and L2E will be released for
measurement. The output STCND would be 3.
Testing the end zone timer function
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End zone timer logic acts as remote back-up to the distance protection and utilizes
the output signals from starting and phase selection elements.
1. To test end zone 1, set OpModetEnd1 to On.
2. Set OpDirEnd1 to Forward, OpModeI0 to Off and tEnd1 to default value.
3. Inject phase voltage and phase current in accordance with Chapter 'Phase-to-
earth fault - circular characteristic' for test points P1, P2 and P3 or Chapter
'Phase-to-earth fault - quadrilateral characteristic' for test points P1, P2, P3,
P4 and P5 if SystemEarthing is chosen as Solidly.
4. If SysemEarthing is selected as Compensated / High impedance, phase
voltage and phase current will be injected in accordance with Chapter 'Phase-
to-earth fault – circular characteristic' for test points P1, P2 and P3 or Chapter
'Phase-to-earth fault – quadrilateral characteristic' for test points P1, P2, P3,
P4 and P5.
5. If OpDirEnd1 is set to Non-directional, the injected phase voltage and phase
current will be in accordance with Chapters 'Phase-to-earth fault - circular
characteristic' and 'Phase-to-earth fault - quadrilateral characteristic' when
SystemEarthing is chosen as Solidly and Chapters 'Phase-to-earth fault –
circular characteristic' and 'Phase-to-earth fault - quadrilateral characteristic'
when SysemEarthing is selected as Compensated / High impedance.
6. If OpModeI0 is set to On, residual overcurrent based tripping will take place
if there were no pick-up from underimpedance starting.
7. Trip outputs TRIP, TRL1 and TRL2 are get activated after set delay of tEnd1.
8. Repeat the above steps to test end zone 2 logic.
Section 10 1MRK 506 377-UEN C
Testing functionality by secondary injection
94 Railway application RER670 2.2 IEC
Commissioning manual
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