GE UR Series L90, Instruction Manual, Page: 372 / 846

5-234 L90 Line Current Differential System GE Multilin
5.6 GROUPED ELEMENTS 5 SETTINGS
5
Figure 5–122: PHASE OVERVOLTAGE SCHEME LOGIC
If the source VT is wye-connected, then the phase overvoltage pickup condition is for V
AB
, V
BC
,
and V
CA
.
d) NEUTRAL OVERVOLTAGE (ANSI 59N, IEC PTOV)
PATH: SETTINGS

GROUPED ELEMENTS

SETTING GROUP 1(6)

VOLTAGE ELEMENTS

NEUTRAL OV1(3)
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

SYSTEM SETUP

AC INPUTS

VOLTAGE BANK

PHASE VT SECONDARY
is the
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
NEUTRAL OV1 PICKUP DELAY
setting applies only if
the
NEUTRAL OV1 CURVE
setting is “Definite time”. The source assigned to this element must be configured for a phase VT.

NEUTRAL OV1

NEUTRAL OV1
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
NEUTRAL OV1 SIGNAL
SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
NEUTRAL OV1 PICKUP:
0.300 pu
Range: 0.000 to 3.000 pu in steps of 0.001
MESSAGE
NEUTRAL OV1 CURVE:
Definite time
Range: Definite time, FlexCurve A, FlexCurve B,
FlexCurve C
MESSAGE
NEUTRAL OV1 PICKUP:
DELAY: 1.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
NEUTRAL OV1 RESET:
DELAY: 1.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
NEUTRAL OV1 BLOCK:
Off
Range: FlexLogic operand
MESSAGE
NEUTRAL OV1 TARGET:
Self-reset
Range: Self-reset, Latched, Disabled
MESSAGE
NEUTRAL OV1 EVENTS:
Disabled
Range: Disabled, Enabled
PHASE OV1
SOURCE:
Source VT = Delta
Source VT = Wye
VAB
VBC
VCA
PHASE OV1 A PKP
PHASE OV1 B PKP
PHASE OV1 C PKP
PHASE OV1 OP
PHASE OV1 A DPO
PHASE OV1 B DPO
PHASE OV1 C DPO
PHASE OV1 A OP
PHASE OV1 B OP
PHASE OV1 C OP
PHASE OV1 DPO
AND
PHASE OV1
FUNCTION:
Disabled = 0
Enabled = 1
SETTING
PHASE OV1
BLOCK:
Off = 0
SETTING
SETTING
PHASE OV1
PICKUP:
SETTING
FLEXLOGIC OPERANDS
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
827066A7.CDR
RUN
VAB PICKUP
≥
RUN
VBC PICKUP
≥
RUN
VCA PICKUP
≥
AND
OR
PHASE OV1 PKP
FLEXLOGIC OPERAND
OR
PHASE OV1 RESET
DELAY:
SETTINGS
tPKP
tPKP
tPKP
tRST
tRST
tRST
PHASE OV1 PICKUP
DELAY:
NOTE
V 3 Pickup
 