Stator Ground - GE G60 Instruction Manual
Generator management relay
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Also See for G60:
- Instruction manual (780 pages) ,
- Communications manual (532 pages) ,
- Communications manual (526 pages)
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5.5 GROUPED ELEMENTS
a) MAIN MENU
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PATH: SETTINGS
GROUPED ELEMENTS
# STATOR
# GROUND
Two means of stator ground fault protection are provided:
•
100% Stator Ground protection that uses third harmonic signals at the neutral of the machine and in the zero-
sequence voltage of the machine terminals.
•
Third Harmonic Neutral Undervoltage protection that responds to the 3rd harmonic in the voltage at the machine neu-
tral point.
The two protection elements are configured through their individual setting menus. They share the
setting. This setting specifies a signal source used to provide current and voltage signals for stator ground fault
SOURCE
protection. For the 100% Stator Ground protection function, the source shall be configured as follows:
•
Phase voltages measured at the terminal of the machine shall be configured as phase VT banks. The element extracts
the 3rd harmonic of the zero-sequence voltage from the phase voltages in order to operate. The VTs must be con-
nected in WYE.
5
•
Voltage measured at the neutral of the machine shall be configured as the Auxiliary VT bank. The element extracts the
3rd harmonic of the auxiliary voltage from the source in order to operate.
For the Third Harmonic Neutral Undervoltage protection function, the source shall be configured as follows:
•
Phase voltages measured at the terminal of the machine shall be configured as Phase VT banks. The element uses
the voltages to measure the power at the machine terminals for power supervision.
•
Phase currents measured at the terminal of the machine shall be configured as Phase CT banks. The element uses
the currents to measures the power at the machine terminals for power supervision.
•
Voltage measured at the neutral of the machine shall be configured as the Auxiliary VT bank. The element extracts the
3rd harmonic of the auxiliary voltage from the source in order to operate.
5-138
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SETTING GROUP 1(6)
STATOR GROUND
SOURCE: SRC1
# 100% STATOR
MESSAGE
# GROUND
# 3RD HARM NTRL
MESSAGE
# UNDERVOLTAGE
G60 Generator Management Relay
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STATOR GROUND
Range: SRC 1, SRC 2, SRC 3, SRC 4
See page 5–139.
See page 5–142.
5 SETTINGS
5.5.16 STATOR GROUND
STATOR GROUND
GE Multilin
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