CHAPTER 7: PROTECTION CONTROL ELEMENTS
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 359
Breaker 2 Failure Option
Range: Continue, Lockout
Default: Continue
This setting establishes how the scheme performs when the breaker closing sequence is
“2-1” and breaker 2 has failed to close. When set to “Continue,” the closing command is
transferred to breaker 1, which continues the reclosing cycle until successful (the
scheme resets) or unsuccessful (the scheme goes to lockout). When set to “Lockout,” the
scheme goes to lockout without attempting to reclose breaker 1.
1-Pole Dead Time
Range: 0 to 655.35 seconds in steps of 0.01
Default: 1.00 seconds
Set this intentional delay setting greater than the estimated de-ionizing time after the
first single-pole trip.
Breaker Sequence
Range: 1, 2, 1&2, 1-2, 2-1
Default: 1-2
This setting selects the breaker reclose sequence. Select “1” to reclose breaker 1 only, “2”
for reclose breaker 2 only, “1&2” to reclose both breakers simultaneously, “1-2” to reclose
breakers sequentially with breaker 1 first, and “2-1” to reclose breakers sequentially with
breaker 2 first.
Bus Fault Initiate
Range: any FlexLogic operand or shared operand
Default: OFF
This setting is used in breaker-and-a-half applications to allow the autoreclose control
function to perform reclosing with only one breaker previously opened by bus protection.
For line faults, both breakers must open for the autoreclose reclosing cycles to take
effect.
To Next Page
Loading...
