ABB REG670 - Page 307

Z
Bare
Z
Measured
+
U
inj
-
I
inj
R
N
C
stat
R
fault
+
U
inj
-
I
inj
R
N
C
stat
Stator Reference
Impedance Z
Ref
R
f
Z
series
Z
mT
a
b
a
b
U
N
IEC11000008-4-en.vsd
Û
IEC11000008 V1 EN
Figure 159: High-resistance generator earthing with a neutral point resistor
There are some alternatives for connection of the neutral point resistor as shown in
figure 160 (low voltage neutral point resistor connected via a DT).
1MRK 502 071-UEN - Section 8
Impedance protection
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 301
Application manual