Stator Ground - GE G60 Instruction Manual

5 SETTINGS
a) MAIN MENU
PATH: SETTINGS GROUPED ELEMENTS
STATOR
GROUND
MESSAGE
MESSAGE
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, and third harmonic neutral under-
voltage protection that responds to the third harmonic in the voltage at the machine neutral 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 third harmonic of the zero-sequence voltage from the phase voltages in order to operate. The VTs must be con-
nected in wye.
• 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
third harmonic of the auxiliary voltage from the source in order to operate.
GE Multilin
SETTING GROUP 1(6)

STATOR GROUND

STATOR GROUND
SOURCE: SRC1
100% STATOR
GROUND
3RD HARM NTRL
UNDERVOLTAGE
G60 Generator Management Relay
5.5 GROUPED ELEMENTS
5.5.16 STATOR GROUND
Range: SRC 1, SRC 2, SRC 3, SRC 4
See page 5–152.
See page 5–155.
5
STATOR GROUND
5-151