GE L90 Instruction Manual page 473

CHAPTER 5: SETTINGS
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.
5.7.14.6 Auxiliary overvoltage (ANSI 59X, IEC PTOV)
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  VOLTAGE ELEMENTS  AUXILIARY OV1(2)
 AUXILIARY OV1

The L90 contains one auxiliary overvoltage element for each VT bank. This element is intended for monitoring overvoltage
conditions of the auxiliary voltage. The nominal secondary voltage of the auxiliary voltage channel entered under
SETUP  AC INPUTS  VOLTAGE BANK X5  AUXILIARY VT X5 SECONDARY
pickup level.
A typical application for this element is monitoring the zero-sequence voltage (3V_0) supplied from an open-corner-delta
VT connection.
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
settings establish the operating curve of the undervoltage element. The auxiliary
Figure 5-159: Auxiliary undervoltage logic
AUX OV1

FUNCTION: Disabled
AUX OV1 SIGNAL

SOURCE: SRC 1
AUX OV1 PICKUP:

0.300 pu
AUX OV1 PICKUP

DELAY: 1.00 s
AUX OV1 RESET

DELAY: 1.00 s
AUX OV1 BLOCK:

Off
AUX OV1 TARGET:

Self-reset
AUX OV1 EVENTS:

Disabled
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: 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
is the per-unit (pu) base used when setting the
GROUPED ELEMENTS
5
SYSTEM
5-287