GE L60 Instruction Manual page 345

Line phase comparison system, ur series
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5 SETTINGS
d) NEUTRAL OVERVOLTAGE (ANSI 59N, IEC PTOV)
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PATH: SETTINGS
GROUPED ELEMENTS
 NEUTRAL OV1
MESSAGE
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There are three neutral overvoltage elements available. The neutral overvoltage element can be used to detect asymmetri-
cal 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 volt-
age channels entered under
SETTINGS
p.u. base used when setting the pickup level.
The neutral overvoltage element can provide a time-delayed operating characteristic versus the applied voltage (initialized
from FlexCurves A, B, or C) or be used as a definite time element. The
the
setting is "Definite time". The source assigned to this element must be configured for a phase VT.
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.
GE Multilin
SETTING GROUP 1(6)
NEUTRAL OV1
FUNCTION: Disabled
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

SYSTEM SETUP
Figure 5–110: NEUTRAL OVERVOLTAGE1 SCHEME LOGIC
L60 Line Phase Comparison System
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
VOLTAGE ELEMENTS
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: 0.000 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

AC INPUTS
VOLTAGE BANK
NEUTRAL OV1 PICKUP DELAY
5.5 GROUPED ELEMENTS
NEUTRAL OV1(3)
is the
PHASE VT SECONDARY
setting applies only if
5-207
5

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