GE EX2100 Manuel D’Utilisation
4-18
••••
Chapter 4 Terminal Board I/O and Equipment Connections
GEH-6632 EX2100 User’s Guide
Shaft Voltage Suppressor
Excitation systems, which produce a dc voltage from an ac supply through a solid
state rectification process, cause ripple and spike voltages at the exciter output. Due
to their rapid rise and decay times these voltages are capacitively coupled from the
field winding to the rotor body. This creates a voltage on the shaft relative to ground
that, if not effectively controlled, can damage both journals and bearings. The shaft
voltage suppressor is a filter that conducts the high frequency components of the
induced voltages to ground and limits shaft voltage caused by thyristor commutation
to less than 7 V zero to peak. For the connections to the field, refer to Figure 4-11.
state rectification process, cause ripple and spike voltages at the exciter output. Due
to their rapid rise and decay times these voltages are capacitively coupled from the
field winding to the rotor body. This creates a voltage on the shaft relative to ground
that, if not effectively controlled, can damage both journals and bearings. The shaft
voltage suppressor is a filter that conducts the high frequency components of the
induced voltages to ground and limits shaft voltage caused by thyristor commutation
to less than 7 V zero to peak. For the connections to the field, refer to Figure 4-11.
Generator Field -
Generator Field +
TH1
TH2
Thyrite
HSA
CBRO
Crowbar
1
2
HSC
JCY
JCX
DEPL
EPL1
EPL2
Heatsink
R5
R6
R2
R1
R3
R4
C2
C1
TB1-3
TB1-2
TB1-1
Shaft Voltage Suppressor
53B
AUX
J1-1
J1-2
8
7
Field
Flashing
Flashing
Figure 4-11 Shaft Voltage Suppressor, Thyrite, and Crowbar