GE D90 Plus Instruction Manual page 287

CHAPTER 7: PROTECTION
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
single-pole tripping applications when evolving faults are of importance and slightly
delayed operation on evolving faults could be traded for enhanced accuracy of single-
pole tripping.
Trip Delay on Evolving Faults
Range: 0 to 65.535 seconds in steps of 0.001
Default: 0.000 seconds
This setting should be used in conjunction with the
value should typically be set around one-half a power system cycle. This setting should
be used only in single-pole tripping applications when evolving faults are of importance
and slightly delayed operation on evolving faults could be traded for enhanced accuracy
of single-pole tripping.
Breaker Phase A Open, Breaker Phase B Open, Breaker Phase C Open
Range: any FlexLogic™ operand or shared operand
Default: OFF
Protection elements are assigned to the trip output scheme will assert appropriate
outputs (the
TRIP PHASE A,
based on the mode setting and the fault type. These outputs are latched until the
Plus
D90 detects the breaker has opened via the open pole logic. A user-defined signal
may also be assigned with these settings to reset the outputs.
Events
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the logging of trip output events in the sequence of
events recorder.
The trip output scheme logic is shown below.
Reverse Fault
TRIP PHASE B, TRIP PHASE C, TRIP
CONTROL ELEMENTS
setting (see above). This
1-POLE, and operands)
TRIP 3-POLE
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