2–22 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
ELECTRICAL INSTALLATION CHAPTER 2: INSTALLATION
Figure 2-22: Sensitive Ground Inputs
Alternatively, the 50:0.025 ground CT input has been designed for sensitive ground current
detection on high resistance grounded systems where the GE Digital Energy 50:0.025 core-
balance CT is to be used.
For example, in mining applications where earth leakage current must be measured for
personnel safety, primary ground current as low as 0.5 A primary may be detected with
the GE Digital Energy 50:0.025 CT. Only one ground CT input tap must be used on a given
unit. Note that when this CT input is selected for the Ground Fault function, fixed ratio of
50:0.025 A is used by the relay.
Figure 2-23: Sensitive Ground Current Input Connections
892774A2.cdr
8 Series
J1
J2
J3
J4
J5
K7
J6
K8K7 K8K8 K7
894078A2.cdr
K7 K8
MACHINE
SENSITIVE
GROUND
I
sg
SENSITIVE GROUND INPUT
WITH ZERO SEQUENCE CT
GE 50:0.025
core-balance CT
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