GE D30 Instruction Manual page 466
Line distance protection system
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GROUPED ELEMENTS
There are three neutral overvoltage elements available. The neutral overvoltage element can be used to detect
asymmetrical system voltage condition due to a ground fault or to the loss of one or two phases of the source. The
element responds to the system neutral voltage (3V_0), calculated from the phase voltages. The nominal secondary
voltage of the phase voltage channels entered under
is the p.u. base used when setting the pickup level.
VT SECONDARY
The neutral overvoltage element can provide a time-delayed operating characteristic versus the applied voltage (initialized
5
from FlexCurves A, B, or C) or be used as a definite time element. The
NEUTRAL OV1 CURVE
VT errors and normal voltage unbalance must be considered when setting this element. This function requires the VTs to
be wye-connected.
5.7.12.5 Negative sequence overvoltage (ANSI 59Q, IEC PTOV)
SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) VOLTAGE ELEMENTS NEG SEQ OV1(3)
NEG SEQ OV1
5-256
NEUTRAL OV1 SIGNAL
SOURCE: SRC 1
NEUTRAL OV1 PICKUP:
0.300 pu
NEUTRAL OV1 CURVE:
Definite Time
NEUTRAL OV1 PICKUP:
DELAY: 1.00 s
NEUTRAL OV1 RESET:
DELAY: 1.00 s
NEUTRAL OV1 BLOCK:
Off
NEUTRAL OV1 TARGET:
Self-reset
NEUTRAL OV1 EVENTS:
Disabled
setting is "Definite Time." The source assigned to this element must be configured for a phase VT.
Figure 5-144: Neutral overvoltage1 logic
NEG SEQ OV1
FUNCTION: Disabled
NEG SEQ OV1 SIGNAL
SOURCE: SRC 1
NEG SEQ OV1 PICKUP:
0.300 pu
Range: SRC 1, SRC 2
Range: 0.004 to 3.000 pu in steps of 0.001
Range: Definite Time, FlexCurve A, FlexCurve B,
FlexCurve C
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
SETTINGS SYSTEM SETUP AC INPUTS VOLTAGE BANK PHASE
NEUTRAL OV1 PICKUP DELAY
Range: Disabled, Enabled
Range: SRC 1, SRC 2
Range: 0.004 to 1.250 pu in steps of 0.001
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
setting applies only if the
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