GE D90 Plus Instruction Manual page 274

GROUPED PROTECTION ELEMENTS
264
Mode
Range: Phase to Ground, Phase to Phase
Default: Phase to Ground
This setting selects the operating mode. Select phase-to-ground or phase-to-phase for
wye VT connections, or phase-to-phase for delta VT connections.
Pickup
Range: 0.000 to 1.100 pu in steps of 0.001
Default: 1.000 pu
This setting specifies the phase undervoltage pickup level in per-unit values.
Curve
Range: Definite Time, Inverse Time
Default: Definite Time
This setting selects the desired time-delay operating characteristic versus the applied
fundamental voltage or the definite time element.
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 phase undervoltage element.
Minimum Voltage
Range: 0.000 to 3.000 pu in steps of 0.001
Default: 0.100 pu
This setting specifies the operating voltage in per-unit values below which the element is
blocked. A value of "0" will allow a dead source to be considered a fault condition.
Block
Range: any FlexLogic™ operand or shared operand
Default: Off
Assertion of the operand assigned to this setting blocks the phase undervoltage
element.
Events
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the logging of phase undervoltage events in the
sequence of events recorder.
The following protection FlexLogic™ operands are available for the phase undervoltage
elements.
Phase undervoltage operands
PHASE UV1 DPO .........................................Asserted when at least one phase of the phase undervoltage 1
PHASE UV1 DPO A.....................................Asserted when phase A of the phase undervoltage 1 element
PHASE UV1 DPO B.....................................Asserted when phase B of the phase undervoltage 1 element
PHASE UV1 DPO C.....................................Asserted when phase C of the phase undervoltage 1 element
PHASE UV1 OP.............................................Asserted when at least one phase of the phase undervoltage 1
PHASE UV1 OP A ........................................Asserted when phase A of the phase undervoltage 1 element
element drops out.
drops out.
drops out.
drops out.
element operates.
operates.
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION