Mho Characteristics - ABB Relion 650 Series REL650 Commissioning Manual

1MRK 506 331-UUS A
6.3.1.2
Commissioning Manual
Test point Reach Value
5 X RFPE · tan (ArgLd)
R RFPE
6 X -0.5 RLdFw · tan (ArgDir)
R 0.5 RLdFw
7 X 0.5 (Z · Sin (LineAng) + KNMag ·
Z · Sin (LineAng + KNAng))
R 0

Mho characteristics

Phase-to-phase faults
X
3
IEC07000009 V4 EN
Figure 11: Proposed test points for phase-to-phase fault
Table 4: Test points for phase-to-phase (ohms / phase)
Test reach Value
points
1 X ZPP · sin(ZAngPP)
R ZPP · sin(ZAngPP)
2 X 0,5· (ZPP· sin(ZAngPP)
R 0,5·ZPP + ΔR = 0,5·ZPP·(1+cos(ZAngPP))
3 X 0,5·ZPP·sin(ZAngPP)
R 0,5·ZPP - ΔR = 0,5·ZPP(1-cos(ZAngPP))
Comments
Only when RLdFw < RFPE
Time measurement
1
ZPP
2
50%
ZAngPP
R
Ohm/phase
IEC07000009-4-en.vsd
Section 6
Testing functionality
Comments
49