In some applications the neutral point resistor is connected to the low voltage side of a
single-phase distribution transformer, connected to the generator neutral point. In such
a case the voltage measurement can be made directly across the secondary resistor.
Generator unit transformer
ANSI11000094_1_en.vsd
3I
0
ANSI11000094 V1 EN-US
Figure 215: Neutral point current measurement
In some power plants the connection of the neutral point resistor is made to the
generator unit transformer neutral point. This is often done if several generators are
connected to the same bus. The detection of ground-fault can be made by current
measurement as shown in figure
216.
Generator unit transformer
3I
0
= I
A
+ I
B
+ I
C
ANSI06000320_3_en.vsd
ANSI06000320 V3 EN-US
Figure 216: Residual current measurement
1MRK 502 071-UUS A Section 10
Voltage protection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 467
Application manual
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