Change the magnitude and angle of phase-to-phase voltage to achieve impedances at
test points 1, 2 and 3. For each test point, observe that the output signals, START,
STLx and STPP are activated where x refers to the actual phase to be tested. After the
timer tPP for the actual zone has elapsed, also the signals TRIP, TRPP and TRx shall
be activated.
10.4.3.2 Phase-to-earth faults
For simplicity, the same test points as for phase-to-phase faults are proposed, but
considering new impedance values.
ZAngPE
50%
Ohm/loop
R
X
IEC07000010-4-en.vsd
IEC07000010 V4 EN
Figure 19: Proposed test points for phase-to-earth faults
Table 22: Test points for phase-to-earth loops L1-L2 (Ohm/Loop)
Test
points
Reach Value Comments
1 X ZPE · sin(ZAngPE)
R ZPE · cos(ZAngPE)
2 X 0,5·ZPE · sin(ZAngPE)
R 0,5·ZPE + ΔR = 0,5·ZPE · (1 - cos(ZAngPE))
3 X 0,5·ZPE·sin(ZangPE)
R 0,5·ZPE - ΔR = 0,5·ZPE · (1 - cos(ZAngPE))
Check also in the same way as for phase-to-earth fault for each test point that the
output signals STPE, are activated where x refers to the actual phase to be tested. After
the timer tPE for the zone has elapsed, also the signals TRIP, TRPE and TRx shall be
activated.
1MRK 506 355-UEN A Section 10
Testing functionality by secondary injection
Line distance protection REL670 2.1 IEC 99
Commissioning manual
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