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1MRK 506 377-UEN Rev. L
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 PE
loop from underimpedance starting and no start signal from residual overcurrent start. The
output STCND would become 4.
3.
Create phase-to-phase fault as described in phase-to-phase fault in compensated and high
impedance earthed system.
4.
Three measuring loops will be released for distance measurement after delayed start output
from residual overcurrent start by tI0 if there were no start output from underimpedance starting
and ModeStubLine set to Off. The output STCND would be 15.
5.
Create a fault so that neutral voltage (UL1+UL2) is measured, if it exceeds set U0DetMin value
and set ModeU0DetMin to On, loops L1E and L2E will be released for measurement. The
output STCND would be 3.
Testing the end zone timer function
End zone timer logic acts as remote back-up to the distance protection and utilizes the output signals
from underimpedance and residual overcurrent starting elements.
1.
To test end zone 1, set OpModetEnd1 to On.
2.
Set OpDirEnd1 to Forward, OpModeEndI0 to Off and tEnd1 to default value.
3.
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.
4.
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 SysemEarthing is selected as Compensated / High
impedance.
5.
If OpModeEndI0 is set to On, residual overcurrent based tripping will take place if there were
no pick-up from underimpedance starting.
6.
Trip outputs TRIP, TRL1, TRL2 and TREND1 activated after set delay of tEnd1.
7.
Repeat the above steps to test end zone 2 logic.
Testing the measuring element
1.
Set OpZx to On, DirModeZx to Forward, LCModeZx to Off and PhSelModeZx to Phsel logic.
Assume that the output LDCND is available before performing testing of measuring zone for
accuracy. Where x = 1, 2, ..., 6.
2.
Set ZoneCharSym to NonSymmetry.
3.
Set ModePhPref to Equal priority.
4.
Set ArgNegRes and ArgDir to their default values.
5.
Set X1FWZx, LineAng, ArgLd, REOverRLZx, XEOverXLZx, RFPEFwZx, RFPERvZx,
RFPPFwZx and RFPPRvZx accordingly. Also, ensure that the RLd value is lower than set
RFPEFWZx/RFPPFwZx values.
6.
Reach settings of starting element must be larger than zone reach settings to have proper
selectivity.
Phase-to-earth fault—measuring element
Test points that are to be considered for measurement accuracy of set reactance reach are shown in
Figure
23
Where:
X1Fw = X1FwZx ∗ (1 + XEOverXLZx)
R1Fw = (X1FwZx / tan (LineAng)) ∗ (1 + REOverRLZx)
Railway application RER670
Commissioning manual
and Table 25.
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Section 10
Testing functionality by secondary injection
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GUID-E175A70C-F17A-45B3-8FBF-774A9AB96DCD v2
GUID-D46670BC-2B55-48CC-BC0B-CEF9CB35F2C8 v3
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