GE G60

5-176 G60 Generator Protection System GE Multilin
5.6 GROUPED ELEMENTS 5 SETTINGS
5
5.6.5 STATOR DIFFERENTIAL
PATH: SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  STATOR DIFFERENTIAL
The stator differential protection element is intended for use on the stator windings of rotating machinery.
Figure 5–80: STATOR DIFFERENTIAL CHARACTERISTIC
This element has a dual slope characteristic. The main purpose of the percent-slope characteristic is to prevent a maloper-
ation caused by unbalances between CTs during external faults. CT unbalances arise as a result of the following factors:
1. CT accuracy errors
 STATOR
 DIFFERENTIAL
STATOR DIFF
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
STATOR DIFF LINE
END SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
STATOR DIFF NEUTRAL
END SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
STATOR DIFF
PICKUP: 0.100 pu
Range: 0.050 to 1.000 pu in steps of 0.001
MESSAGE
STATOR DIFF
SLOPE 1: 10 %
Range: 1 to 100% in steps of 1
MESSAGE
STATOR DIFF
BREAK 1: 1.15 pu
Range: 1.00 to 1.50 pu in steps of 0.01
MESSAGE
STATOR DIFF
SLOPE 2: 80 %
Range: 1 to 100% in steps of 1
MESSAGE
STATOR DIFF
BREAK 2: 8.00 pu
Range: 1.50 to 30.00 pu in steps of 0.01
MESSAGE
STATOR DIFF
BLK: Off
Range: FlexLogic operand
MESSAGE
STATOR DIFF
TARGET: Self-reset
Range: Self-reset, Latched, Disabled
MESSAGE
STATOR DIFF
EVENTS: Disabled
Range: Disabled, Enabled
differential
restraining
Break 1
Break 2
Pickup
Slope 1
Slope 2
BlockOperate
830735A1.CDR