Stator Differential - GE Multilin g60 Instruction Manual

5 SETTINGS

PATH: SETTINGS GROUPED ELEMENTS
 STATOR
 DIFFERENTIAL
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
The stator differential protection element is intended for use on the stator windings of rotating machinery.
Pickup
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
GE Multilin

SETTING GROUP 1(6)
STATOR DIFF
FUNCTION: Disabled
STATOR DIFF LINE
END SOURCE: SRC 1
STATOR DIFF NEUTRAL
END SOURCE: SRC 1
STATOR DIFF
PICKUP: 0.100 pu
STATOR DIFF
SLOPE 1: 10 %
STATOR DIFF
BREAK 1: 1.15 pu
STATOR DIFF
SLOPE 2: 80 %
STATOR DIFF
BREAK 2: 8.00 pu
STATOR DIFF
BLK: Off
STATOR DIFF
TARGET: Self-reset
STATOR DIFF
EVENTS: Disabled
Operate
Figure 5–68: STATOR DIFFERENTIAL CHARACTERISTIC
G60 Generator Protection System
5.6 GROUPED ELEMENTS

5.6.5 STATOR DIFFERENTIAL


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
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
830735A1.CDR
5
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