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1MRK 505 378-UEN Rev. K
11.4.3.2
Phase-to-earth faults
For simplicity, the same test points as for phase-to-phase faults are proposed, but considering new
impedance values.
IEC07000010 V4 EN-US
Figure 28:
Table 26:
Test
points
1
2
3
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.
11.4.4
Faulty phase identification with load encroachment FMPSPDIS
There is no specific test routine for this function. The function is tested in conjunction with other
impedance (mho) functions.
11.4.5
Distance protection zones, quadrilateral characteristic,
separate settings ZMRPDIS
Prepare the IED for verification of settings as outlined in section
Consider releasing Zone 1 with the Phase selection with load encroachment, quadrilateral
characteristic (FRPSDPIS). If the autorecloser is not released and in service, trip will always be three
phase.
Measure operating characteristics during constant current conditions. Keep the measured current as
close as possible to its rated value or lower. But make sure it is higher than 30% of the rated current.
Line differential protection RED670
Commissioning manual
X
50%
ZAngPE
Proposed test points for phase-to-earth faults
Test points for phase-to-earth loops L1-L2 (Ohm/Loop)
Reach
Value
X
ZPE · sin(ZAngPE)
R
ZPE · cos(ZAngPE)
X
0,5·ZPE · sin(ZAngPE)
R
0,5·ZPE + ΔR = 0,5·ZPE · (1 - cos(ZAngPE))
X
0,5·ZPE·sin(ZangPE)
R
0,5·ZPE - ΔR = 0,5·ZPE · (1 - cos(ZAngPE))
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Testing functionality by secondary injection
R
Ohm/loop
IEC07000010-4-en.vsd
Comments
"Preparing for test"
Section 11
M14944-393 v7
GUID-79761A97-A99A-4788-94A5-341308DF6E45 v3
GUID-A35C2DED-70A6-4E96-864D-3A6C1147B350 v3
in this chapter.
107
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