Faulty Phase Identification With Load Encroachment Fmpspdis (21) - ABB RET670 Commissioning Manual

1MRK 504 165-UUS -
11.4.4
Transformer protection RET670 2.2 ANSI
Commissioning manual
X
ANSI07000010 V1 EN
Figure 28: Proposed test points for phase-to-ground faults
Table 23: Test points for phase-to-ground loops A-B (Ohm/Loop)
Test Reach Value
points
1 X ZPG · sin(ZAngPG)
R ZPG · cos(ZAngPG)
2 X 0,5·ZPG · sin(ZAngPG)
R 0,5·ZPG + ΔR = 0,5·ZPG · (1 - cos(ZAngPG))
3 X 0,5·ZPG·sin(ZangPG)
R 0,5·ZPG - ΔR = 0,5·ZPG · (1 - cos(ZAngPG))
Check also in the same way as for phase-to-ground fault for each test point that the output
signals PHG_FLT, are activated where x refers to the actual phase to be tested. After the
timer tPG for the zone has elapsed, also the signals TRIP, TRPG and TR_x shall be
activated.
Faulty phase identification with load encroachment FMPSPDIS
(21)
There is no specific test routine for this function. The function is tested in conjunction with
other impedance (mho) functions.
Testing functionality by secondary injection
50%
ZAngPG
R
ANSI07000010-1-en.vsd
Section 11
Ohm/loop
Comments
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