GE D90 Plus Instruction Manual page 240

GROUPED PROTECTION ELEMENTS
Auxiliary overvoltage
232
Block
Range: any FlexLogic™ operand or shared operand
Default: Off
Assertion of the operand assigned to this setting blocks the auxiliary undervoltage
element.
Events
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the logging of auxiliary undervoltage events in the
sequence of events recorder.
The logic for the auxiliary undervoltage element is shown below. The logic is identical for all
auxiliary undervoltage elements.
Figure 185: Auxiliary undervoltage scheme logic
This element is intended for monitoring overvoltage conditions of the auxiliary voltage. A
typical application for this element is monitoring the zero-sequence voltage (3V_0)
supplied from an open-corner-delta VT connection. The nominal secondary voltage of the
auxiliary voltage channel entered in the
used when setting the pickup level.
Select the Settings > Protection > Elements > Group 1 > Voltage > Auxiliary OV menu
item to open the auxiliary overvoltage configuration window.
Figure 186: Auxiliary overvoltage configuration settings
The following settings are available for each auxiliary overvoltage element.
Function
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the auxiliary overvoltage protection element.
Auxiliary VT Secondary
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
setting is the per-unit base