GE G30 Instruction Manual page 463

CHAPTER 5: SETTINGS
If the source VT is wye-connected, then the phase overvoltage pickup condition is V >
V .
CA
5.7.10.4 Neutral overvoltage (ANSI 59N, IEC PTOV)
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  VOLTAGE ELEMENTS  NEUTRAL OV1(3)
 NEUTRAL OV1

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
from FlexCurves A, B, or C) or be used as a definite time element. The
setting is "Definite Time." The source assigned to this element must be configured for a phase VT.
NEUTRAL OV1 CURVE
G30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 5-131: Phase overvoltage logic
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
SETTINGS  SYSTEM SETUP  AC INPUTS  VOLTAGE BANK  PHASE
x Pickup for V
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
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
setting applies only if the
NEUTRAL OV1 PICKUP DELAY
GROUPED ELEMENTS
, V , and
AB BC
5
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