GE G30 Instruction Manual page 465

CHAPTER 5: SETTINGS
5.7.10.6 Auxiliary undervoltage (ANSI 27X, IEC PTUV)
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  VOLTAGE ELEMENTS  AUXILIARY UV1(3)
 AUXILIARY UV1

The G30 contains one auxiliary undervoltage element for each VT bank. This element monitors undervoltage conditions of
the auxiliary voltage.
The selects the voltage level at which the time undervoltage element starts timing. The nominal secondary
AUX UV1 PICKUP
voltage of the auxiliary voltage channel entered under
is the per-unit base used when setting the pickup level.
AUXILIARY VT X5 SECONDARY
The setting selects the minimum operating time of the auxiliary undervoltage element.
AUX UV1 DELAY
Both and
AUX UV1 PICKUP AUX UV1 DELAY
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.
The element resets instantaneously. The minimum voltage setting selects the operating voltage below which the element
is blocked.
G30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 5-133: Negative-sequence overvoltage logic
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
SETTINGS  SYSTEM SETUP  AC INPUTS  VOLTAGE BANK X5 
settings establish the operating curve of the undervoltage element. The auxiliary
GROUPED ELEMENTS
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, 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
5
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