3V
0
V
_
A
V_B
V
_
C
V
_
B
F
V
_C
F
V
_
C
F
ANSI07000190-1-en.vsd
ANSI07000190 V1 EN-US
Figure 206: Ground fault in Non-effectively grounded systems
10.3.3.6 Direct grounded system
GUID-EA622F55-7978-4D1C-9AF7-2BAB5628070A v8
In direct grounded systems, an ground fault on one phase is indicated by voltage
collapse in that phase. The other healthy phase will still have normal phase-to-ground
voltage. The residual sum will have the same value as the remaining phase-to-ground
voltage, which is shown in Figure
207.
V
_
A
V_
B
V
_C
V
_A
F
I
L
1
F
V_
B
V
_C
3V
0
ANSI07000189-1-en.vsd
ANSI07000189 V1 EN-US
Figure 207: Ground fault in Direct grounded system
1MRK 502 071-UUS A Section 10
Voltage protection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 451
Application manual
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