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Neutral Voltage - GE UR Series Instruction Manual

Line differential relay.
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5 SETTINGS
a) NEUTRAL OV1 (NEUTRAL OVERVOLTAGE: ANSI 59N)
ÖØ
PATH: SETTINGS
GROUPED ELEMENTS
NEUTRAL OV1
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
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.
PHASE VT SECONDARY
VT errors and normal voltage unbalance must be considered when setting this element. This function requires the VTs to
be Wye connected.
SETTING
NEUTRAL OV1
FUNCTION:
Disabled=0
Enabled=1
SETTING
NEUTRAL OV1 BLOCK:
Off=0
SETTING
NEUTRAL OV1 SIGNAL
SOURCE:
ZERO SEQ VOLT (V_0)
GE Power Management
Ö
SETTING GROUP 1(8)
NEUTRAL OV1
FUNCTION: Disabled
NEUTRAL OV1 SIGNAL
SOURCE: SRC 1
NEUTRAL OV1 PICKUP:
0.300 pu
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
SETTINGS
SETTING
NEUTRAL OV1 PICKUP:
AND
RUN
<
3V_0 Pickup
Figure 5–58: NEUTRAL OVERVOLTAGE SCHEME LOGIC
L90 Line Differential Relay
5.5 GROUPED ELEMENTS
ÖØ
ÖØ
VOLTAGE ELEMENTS
NEUTRAL OV1
Range: Disabled, Enabled
Range: SRC 1, SRC 2,..., SRC 6
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
ÖØ
Ö
SYSTEM SETUP
AC INPUTS
SETTING
NEUTRAL OV1 PICKUP
DELAY :
NEUTRAL OV1 RESET
DELAY :
t
PKP
t
RST

5.5.19 NEUTRAL VOLTAGE

ÖØ
Ö
VOLTAGE BANK
FLEXLOGIC OPERANDS
NEUTRAL OV1 OP
NEUTRAL OV1 DPO
NEUTRAL OV1 PKP
827848A1.CDR
5-115
5

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L90

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