ABB Relion 650 Series REL650 Commissioning Manual page 56

Section 6
Testing functionality
48
Phase-to-ground fault
X
1
e
4
80%
Z
7
50%
a
d
2
c
6
RLdFw
IEC09000725 V1 EN
Figure 10: Distance protection characteristic with test points for phase-to-ground
measurements
Table 3 is used in conjunction with figure 10.
Table 3: Test points for phase-to-groundC-E (Ohm/Loop)
Test point Reach Value
1 X Z · Sin (LineAng) + KNMag · Z ·
Sin (LineAng + KNAng)
R 0
2 X 0
R RLdFw
R RFPE
3 X 0.8 (Z · Sin (LineAng) + KNMag ·
Z · Sin (LineAng + KNAng))
R 0.8(Z · Cos (LineAng) + KNMag ·
Z · Cos (LineAng + KNAng)) +
RFPE
4 X 0.8 (Z · Sin (LineAng) + KNMag ·
Z · Sin (LineAng + KNAng))
R -(0.8 (Z · Sin (LineAng) + KNMag ·
Z · Sin (LineAng + KNAng)) ·
tan (ArgNegRes-90)
Table continues on next page
RFPE
3
5
b
R W/loop
IEC09000725_1_en.vsd
1MRK 506 331-UUS A
Comments
When RLdFw < RFPE
When RLdFw > RFPE
Can be limited by RFPE
Commissioning Manual