Shaft Voltage Suppressor - GE EX2100 User Manual

Shaft Voltage Suppressor

Generator Field +

Shaft Voltage Suppressor

TB1-1
4-18 Chapter 4 Terminal Board I/O and Equipment Connections
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.
C1
R1 R2
Field
Flashing
Thyrite
TH1
Crowbar
HSA
Heatsink
JCY JCX
EPL1
EPL2
Figure 4-11 Shaft Voltage Suppressor, Thyrite, and Crowbar
C2
R5 R6
R3
TB1-3
J1-1
53B
7
8 AUX
J1-2
TH2
CBRO
1 2
DEPL
Generator Field -
TB1-2
R4
HSC
GEH-6632 EX2100 User's Guide