328 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CONTROL ELEMENTS CHAPTER 7: PROTECTION
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
Reverse Fault setting. Set it typically to around
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, TRIP PHASE B, TRIP PHASE C, TRIP 1-POLE, and TRIP 3-POLE operands)
based on the mode setting and the fault type. These outputs are latched until the
D90
Plus
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.
To Next Page
Loading...
