GE D90 Plus Instruction Manual page 338

CONTROL ELEMENTS
328
pickup delay, and a two-cycle dropout delay. Use this setting only in single-pole tripping
applications when evolving faults are of importance and slightly delayed operation on
evolving faults can 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
Use this setting in conjunction with the
one-half a power system cycle. Use this setting only in single-pole tripping applications
when evolving faults are of importance and slightly delayed operation on evolving faults
can 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 that are assigned to the trip output scheme 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 that the breaker has opened via the open pole logic. A user-defined
signal can 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 figure shows trip output scheme logic.
Reverse Fault
TRIP PHASE B, TRIP PHASE C, TRIP
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
setting. Set it typically to around
1-POLE, and operands)
TRIP 3-POLE