GE UR Series L90, Инструкция по эксплуатации

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GE Multilin L90 Line Current Differential System 5-235
5 SETTINGS 5.6 GROUPED ELEMENTS
5
VT errors and normal voltage unbalance must be considered when setting this element. This function requires the VTs to
be wye-connected.
Figure 5–123: NEUTRAL OVERVOLTAGE1 SCHEME LOGIC
e) AUXILIARY UNDERVOLTAGE (ANSI 27X, IEC PTUV)
PATH: SETTINGS

GROUPED ELEMENTS

SETTING GROUP 1(6)

VOLTAGE ELEMENTS

AUXILIARY UV1(2)
The L90 contains one auxiliary undervoltage element for each VT bank. This element is intended for monitoring undervolt-
age conditions of the auxiliary voltage. The
AUX UV1 PICKUP
selects the voltage level at which the time undervoltage ele-
ment starts timing. The nominal secondary voltage of the auxiliary voltage channel entered under
SETTINGS

SYSTEM
SETUP

AC INPUTS

VOLTAGE BANK X5

AUXILIARY VT X5 SECONDARY
is the per-unit base used when setting the
pickup level.
The
AUX UV1 DELAY
setting selects the minimum operating time of the auxiliary undervoltage element. Both
AUX UV1 PICKUP
and
AUX UV1 DELAY
settings establish the operating curve of the undervoltage element. The auxiliary undervoltage element
can be programmed to use either definite time delay or inverse time delay characteristics. The operating characteristics
and equations for both definite and inverse time delay are as for the phase undervoltage element.

AUXILIARY UV1

AUX UV1
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
AUX UV1 SIGNAL
SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
AUX UV1 PICKUP:
0.700 pu
Range: 0.000 to 3.000 pu in steps of 0.001
MESSAGE
AUX UV1 CURVE:
Definite Time
Range: Definite Time, Inverse Time
MESSAGE
AUX UV1 DELAY:
1.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
AUX UV1 MINIMUM:
VOLTAGE: 0.100 pu
Range: 0.000 to 3.000 pu in steps of 0.001
MESSAGE
AUX UV1 BLOCK:
Off
Range: FlexLogic™ operand
MESSAGE
AUX UV1 TARGET:
Self-reset
Range: Self-reset, Latched, Disabled
MESSAGE
AUX UV1 EVENTS:
Disabled
Range: Disabled, Enabled
827848A3.CDR
FLEXLOGIC OPERANDS
NEUTRAL OV1
FUNCTION:
NEUTRAL OV1 BLOCK:
NEUTRAL OV1 SIGNAL
SOURCE:
NEUTRAL OV1 PICKUP:
NEUTRAL OV1 DPO
NEUTRAL OV1 OP
NEUTRAL OV1 PKP
RUN AND
SETTING
SETTING
NEUTRAL OV1 RESET
DELAY :
NEUTRAL OV1 PICKUP
DELAY :
SETTING
Enabled=1
t
PKP
t
RST
SETTING
SETTING
Off=0
ZERO SEQ VOLT (V_0)
3V_0 Pickup
<
NEUTRAL OV1 CURVE :
t