GE L90 Instruction Manual page 353

5 SETTINGS
VT errors and normal voltage unbalance must be considered when setting this element. This function requires the VTs to
be wye-connected.
e) AUXILIARY UNDERVOLTAGE (ANSI 27X, IEC PTUV)
PATH: SETTINGS GROUPED ELEMENTS
AUXILIARY UV1
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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
ment starts timing. The nominal secondary voltage of the auxiliary voltage channel entered under
SETUP AC INPUTS VOLTAGE BANK X5
pickup level.
The setting selects the minimum operating time of the auxiliary undervoltage element. Both
AUX UV1 DELAY
and settings establish the operating curve of the undervoltage element. The auxiliary undervoltage element
AUX UV1 DELAY
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.
GE Multilin
Figure 5–108: NEUTRAL OVERVOLTAGE1 SCHEME LOGIC
SETTING GROUP 1(6)
AUX UV1
FUNCTION: Disabled
AUX UV1 SIGNAL
SOURCE: SRC 1
AUX UV1 PICKUP:
0.700 pu
AUX UV1 CURVE:
Definite Time
AUX UV1 DELAY:
1.00 s
AUX UV1 MINIMUM:
VOLTAGE: 0.100 pu
AUX UV1 BLOCK:
Off
AUX UV1 TARGET:
Self-reset
AUX UV1 EVENTS:
Disabled
AUX UV1 PICKUP
AUXILIARY VT X5 SECONDARY
L90 Line Current Differential System
VOLTAGE ELEMENTS
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: 0.000 to 3.000 pu in steps of 0.001
Range: Definite Time, Inverse Time
Range: 0.00 to 600.00 s in steps of 0.01
Range: 0.000 to 3.000 pu in steps of 0.001
Range: FlexLogic™ operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
selects the voltage level at which the time undervoltage ele-
is the per-unit base used when setting the
5.6 GROUPED ELEMENTS
AUXILIARY UV1(2)
SETTINGS SYSTEM
AUX UV1 PICKUP
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