GE D90 Plus Instruction Manual page 238

GROUPED PROTECTION ELEMENTS
Auxiliary undervoltage
230
Source
Range: LINE (SRC 1), BKR 1 (SRC 2), BKR 2 (SRC 3)
Default: LINE (SRC 1)
This setting selects the signal source for the negative-sequence overvoltage protection
element.
Pickup
Range: 0.000 to 1.250 pu in steps of 0.001
Default: 1.000 pu
This setting specifies the negative-sequence overvoltage pickup level in per-unit values.
Pickup Delay
Range: 0.00 to 600.00 seconds in steps of 0.01
Default: 1.00 seconds
This setting specifies the minimum operating time of the negative-sequence overvoltage
element.
Reset Delay
Range: 0.00 to 600.00 seconds in steps of 0.01
Default: 1.00 seconds
This setting specifies the minimum reset time of the negative-sequence overvoltage
element.
Block
Range: any FlexLogic™ operand or shared operand
Default: Off
Assertion of the operand assigned to this setting blocks the negative-sequence
overvoltage element.
Events
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the logging of negative-sequence overvoltage events
in the sequence of events recorder.
The logic for the negative-sequence overvoltage element is shown below. The logic is
identical for all negative-sequence overvoltage elements.
Figure 183: Negative-sequence overvoltage scheme logic
The auxiliary undervoltage element is intended for monitoring undervoltage conditions of
the auxiliary voltage. The element pickup selects the voltage level at which the time
undervoltage element starts timing. The nominal secondary voltage of the auxiliary
voltage channel entered for the
when setting the pickup level.
Auxiliary VT Secondary
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
setting is the per-unit base used