Stator Differential - GE G60 Instruction Manual

5.6 GROUPED ELEMENTS

PATH: SETTINGS GROUPED ELEMENTS
 STATOR
 DIFFERENTIAL
5
The stator differential protection element is intended for use on the stator windings of rotating machinery.
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
5-176

SETTING GROUP 1(6)
STATOR DIFF
FUNCTION: Disabled
STATOR DIFF LINE
MESSAGE
END SOURCE: SRC 1
STATOR DIFF NEUTRAL
MESSAGE
END SOURCE: SRC 1
STATOR DIFF
MESSAGE
PICKUP:
STATOR DIFF
MESSAGE
SLOPE 1: 10 %
STATOR DIFF
MESSAGE
BREAK 1: 1.15 pu
STATOR DIFF
MESSAGE
SLOPE 2: 80 %
STATOR DIFF
MESSAGE
BREAK 2: 8.00 pu
STATOR DIFF
MESSAGE
BLK: Off
STATOR DIFF
MESSAGE
TARGET: Self-reset
STATOR DIFF
MESSAGE
EVENTS: Disabled
Operate
Pickup
Figure 5–80: STATOR DIFFERENTIAL CHARACTERISTIC
G60 Generator Protection System


STATOR DIFFERENTIAL

Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: 0.050 to 1.000 pu in steps of 0.001
0.100 pu
Range: 1 to 100% in steps of 1
Range: 1.00 to 1.50 pu in steps of 0.01
Range: 1 to 100% in steps of 1
Range: 1.50 to 30.00 pu in steps of 0.01
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
Block
Slope 2
Slope 1
restraining
5 SETTINGS
5.6.5 STATOR DIFFERENTIAL
830735A1.CDR
GE Multilin