GE B30 Instruction Manual page 272

5.6 GROUPED ELEMENTS
c) NEUTRAL OVERVOLTAGE (ANSI 59N, IEC PTOV)

PATH: SETTINGS GROUPED ELEMENTS
 NEUTRAL OV1

5
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
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
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.
5-148

SETTING GROUP 1(6)
NEUTRAL OV1
FUNCTION: Disabled
NEUTRAL OV1 SIGNAL
MESSAGE
SOURCE: SRC 1
NEUTRAL OV1 PICKUP:
MESSAGE
0.300 pu
NEUTRAL OV1 CURVE:
MESSAGE
Definite time
NEUTRAL OV1 PICKUP:
MESSAGE
DELAY: 1.00 s
NEUTRAL OV1 RESET:
MESSAGE
DELAY: 1.00 s
NEUTRAL OV1 BLOCK:
MESSAGE
Off
NEUTRAL OV1 TARGET:
MESSAGE
Self-reset
NEUTRAL OV1 EVENTS:
MESSAGE
Disabled

SETTINGS SYSTEM SETUP
setting is "Definite time". The source assigned to this element must be configured for a phase VT.
Figure 5–64: NEUTRAL OVERVOLTAGE1 SCHEME LOGIC
B30 Bus Differential System

VOLTAGE ELEMENTS
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
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 SETTINGS

NEUTRAL OV1(3)
is the

PHASE VT SECONDARY
setting applies only if
GE Multilin