GE D90 Plus - Page 366

356 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CONTROL ELEMENTS CHAPTER 7: PROTECTION
3-Pole TD Initiate
Range: any FlexLogic operand or shared operand
Default: Off
This setting selects an operand used to initiate three-pole autoreclosure. The second
timer (
3-Pole Dead Time 2) can be used for a time-delay autoreclosure.
Multi-Phase Fault
Range: any FlexLogic operand or shared operand
Default: Off
This setting selects an operand used to indicate a multi-phase fault. The operand value
should be zero for single-phase to ground faults.
Breaker 1-Pole Open
Range: any FlexLogic operand or shared operand
Default: Off
This setting selects an operand to indicate that the breaker or breakers have opened
correctly following a single-phase to ground fault. The autoreclose scheme can then
start timing the single-pole dead time. For example, if the reclose sequence is “1-2,”
breaker 1 trips single-pole and breaker 2 trips three-pole.
The scheme has a pre-wired input that indicates breaker status.
Breaker 3-Pole Open
Range: any FlexLogic operand or shared operand
Default: Off
This setting selects an operand to indicate that the breaker or breakers have opened
three-pole and the autoreclose scheme can start timing the three-pole dead time. The
scheme has a pre-wired input that indicates breaker status.
3-Pole Dead Time 1
Range: 0.00 to 655.35 seconds in steps of 0.01
Default: 0.50 seconds
This setting specifies the dead time following the first three-pole trip. This intentional
delay can be used for a high-speed three-pole autoreclose. However, set it longer than
the estimated de-ionizing time following the three-pole trip.
3-Pole Dead Time 2
Range: 0.00 to 655.35 seconds in steps of 0.01
Default: 1.20 seconds
This setting specifies the dead time following the second three-pole trip or initiated by
the
3-Pole Time Delay Initiate setting. This intentional delay is used typically for a time
delayed three-pole autoreclose (as opposed to high speed three-pole autoreclose).
3 Pole Dead Time 3
Range: 0.00 to 655.35 seconds in steps of 0.01
Default: 2.00 seconds
This setting specifies the dead time following the third three-pole trip.
3-Pole Dead Time 4
Range: 0.00 to 655.35 seconds in steps of 0.01
Default: 4.00 seconds
This setting specifies the dead time following the fourth three-pole trip.