Phase-To-Phase Faults; Phase-To-Ground Faults - ABB RET670 Commissioning Manual

1MRK 504 154-UUS B
10.4.3.1

Phase-to-phase faults

IEC07000009 V4 EN-US
Figure 18: Proposed test points for phase-to-phase fault
Table 21:
Test
points
1
2
3
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, PICKUP, PU_x and PHPH_FLT are
activated where x refers to the actual phase to be tested. After the timer
has elapsed, also the signals TRIP, TRPP and TR_x shall be activated.
10.4.3.2

Phase-to-ground faults

For simplicity, the same test points as for phase-to-phase faults are proposed, but considering
new impedance values.
Commissioning manual
X
3
50%
ZAngPP
Test points for phase-to-phase (ohms / phase)
reach Value
X ZPP · sin(ZAngPP)
R ZPP · sin(ZAngPP)
X 0,5· (ZPP· sin(ZAngPP)
R 0,5·ZPP + ΔR = 0,5·ZPP·(1+cos(ZAngPP))
X 0,5·ZPP·sin(ZAngPP)
R 0,5·ZPP - ΔR = 0,5·ZPP(1-cos(ZAngPP))
1
ZPP
2
R
Ohm/phase
IEC07000009-4-en.vsd
Testing functionality by secondary injection
Comments
tPP for the actual zone
Section 10
M14944-292 v8
M14944-393 v7
91