GE C70 Instruction Manual page 305

5 SETTINGS
e) NEGATIVE-SEQUENCE OVERVOLTAGE(ANSI 59Q, IEC PTOV)
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PATH: SETTINGS GROUPED ELEMENTS
 NEG SEQ OV1
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MESSAGE
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There is one negative-sequence overvoltage element available per CT bank, to a maximum of three.
The negative-sequence overvoltage element may be used to detect loss of one or two phases of the source, a reversed
phase sequence of voltage, or a non-symmetrical system voltage condition.
Figure 5–79: NEGATIVE-SEQUENCE OVERVOLTAGE SCHEME LOGIC
GE Multilin
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SETTING GROUP 1(6)
NEG SEQ OV1
FUNCTION: Disabled
NEG SEQ OV1 SIGNAL
SOURCE: SRC 1
NEG SEQ OV1 PICKUP:
0.300 pu
NEG SEQ OV1 PICKUP
DELAY: 0.50 s
NEG SEQ OV1 RESET
DELAY: 0.50 s
NEG SEQ OV1 BLOCK:
Off
NEG SEQ OV1 TARGET:
Self-reset
NEG SEQ OV1 EVENTS:
Disabled
C70 Capacitor Bank Protection and Control System
5.6 GROUPED ELEMENTS
 
VOLTAGE ELEMENTS NEG SEQ OV1(3)
Range: Disabled, Enabled
Range: SRC 1, SRC 2
Range: 0.000 to 1.250 pu in steps of 0.001
Range: 0.00 to 600.00 s in steps of 0.01
Range: 0.00 to 600.00 s in steps of 0.01
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
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