Siemens SIPROTEC 7UM62 - Page 204

Functions
2.28 90-%-Stator Earth Fault Protection (ANSI 59N, 64G, 67G)
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
204
Figure 2-84 Unit Connection with Neutral Transformer
R
B
Loading resistance
R
T
Voltage divider
U
E
Displacement Voltage
C
G
Generator earth capacitance
C
L
Line earth capacitance
C
Tr
Unit transformer earth capacitance
C
coup
Unit transformer coupling capacitance
Figure 2-85 Unit Connection with Earthing Transformer
R
B
Loading resistance
R
T
Voltage divider
U
E
Displacement voltage
C
G
Generator earth capacitance
C
L
Line earth capacitance
C
Tr
Unit transformer earth capacitance
C
coup
Unit transformer coupling capacitance