ABB Relion 670 series - Page 428

Z
Bare
Z
Measured
+
V
inj
-
I
inj
R
N
C
stat
R
fault
+
V
inj
-
I
inj
R
N
C
stat
Stator Reference
Impedance Z
Ref
R
f
Z
series
Z
mT
a
b
a
b
V
N
ANSI11000008_1_en.vsd
Û
ANSI11000008 V1 EN-US
Figure 225: High-resistance generator grounding with a neutral point resistor
There are some alternatives for connection of the neutral point resistor as shown in figure 226
(low voltage neutral point resistor connected via a DT).
Section 7 1MRK 502 066-UUS B
Impedance protection
422
Technical manual