Stator Ground Protection System - GE Multilin g60 Instruction Manual

3.4 FIELD AND STATOR GROUND MODULES
The following diagram illustrates how to wire the GPM-F-HM module with the GPM-F-R resistor box for both single-point
injection and double-point injection.
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Figure 3–62: CONNECTING THE FIELD GROUND PROTECTION MODULE TO THE HIGH-VOLTAGE RESISTOR BOX
The connection between F1 (terminal C2) on the GPM-F-HM field ground protection module and terminal A3 on the
GPM-F-R high-voltage resistor box module should be shielded. The length should be kept as short as possible and
NOTE not exceed 10 meters.
The connection between the F+ and F– pair (terminals C3 and C4) on the GPM-F-HM field ground protection mod-
ule and terminals A5 and A7 on the GPM-F-R high-voltage resistor box module should be shielded. The length
NOTE should be kept as short as possible and not exceed 10 meters.
Terminals C1 and C3 of the GPM-F-R high-voltage resistor box must be externally shorted for both single-
point injection and double-point injection.
NOTE
In the 100% stator ground fault protection based on sub-harmonic injection, a 20 Hz voltage is injected to detect ground
faults at any point across 100% of the winding. The stator ground module works in combination the G60 to provide 100%
stator ground fault protection that is operational during generator start-up, running and stopped conditions.
The stator ground protection system consists of three modules: the stator ground protection 20 Hz generator module
(GPM-S-G), the stator ground band pass filter module (GPM-S-B), and the stator ground protection CT (204-SD-43737).
The mounting and dimension diagrams are shown below (all dimensions are in inches).
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3.4.4 STATOR GROUND PROTECTION SYSTEM

G60 Generator Protection System
3 HARDWARE
GE Multilin