Table 21: Test points for phase-to-earth loop measuring element
Test point R X Comment
P1 0
X1Fw
P2
R1Fw X1Fw
P3 (0.8 ∗
R1Fw
) +
RFPEFwZx
0.8 ∗
X1Fw
P4 0.8 ∗
RFPEFwZx
0.8 ∗
RFPEFwZx
∗ tan
(
ArgLd
)
P5
RLd
0
P6
RFPEFwZx
0 If
LEModeZx
= Off and
OpLoadEnch
= Off
P7 0.5 ∗
RLd
0.5 ∗
RLd
∗ tan
(
ArgDir
)
P8 0.5 ∗
RFPERvZx X1Fw
P9 0.8 ∗
X1Fw
∗ tan
(
ArgNegRes
)
0.8 ∗
X1Fw
1. Change the magnitude and angle of phase-to-earth voltage in phase L1 to
achieve impedances at test points P1, P2, …, P9.
2. Test points P7 and P9 are intended to test the directional lines of impedance
protection and used to find directional accuracy for phase-to-earth faults.
3. For each test point, observe that the start output signals START, STZx,
STNDZx, STL1 and STPE are activated.
4. Trip signals TRIP, TRZx, TRL1 will appear after set delay time of tPEZx if
OpModetPEZx is set to On and TimerSelZx is set to Timers separated.
5. Repeat the above test by injecting phase-to-earth voltage in phase L2 in
accordance with test points and steps described above and observe that the
start output signals START, STZx, STNDZx, STL1 and STPE are activated.
6. Trip signals TRIP, TRZx, TRL2 will appear after set delay time of tPEZx if
OpModetPEZx is set to On and TimerSelZx is set to Timers separated.
phase-to-phase fault – measuring element
GUID-C8EE9E16-7307-4853-B9A9-6AFCEA8807BE v1
Test points that are to be considered for measurement accuracy of set reactance
reach are shown in Figure
20 and Table 22.
Where:
X1Fw = X1FwZx
R1Fw = X1FwZx / tan (LineAng)
Section 10 1MRK 506 377-UEN C
Testing functionality by secondary injection
96 Railway application RER670 2.2 IEC
Commissioning manual
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