GE D90 Plus Instruction Manual page 367

CHAPTER 7: PROTECTION
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Extend Dead Time 1
Range: any FlexLogic operand or shared operand
Default: Off
This setting selects an operand to adapt the duration of the dead time for the first shot
to the possibility of non-simultaneous tripping at the two line ends. Typically this is the
operand set when the communication channel is out-of-service.
Dead Time 1 Extension
Range: 0.00 to 655.35 seconds in steps of 0.01
Default: 0.50 seconds
This setting specifies the length of the dead time 1 extension for possible non-
simultaneous tripping of the two ends of the line.
Reset
Range: any FlexLogic operand or shared operand
Default: Off
This setting selects the operand that forces the autoreclose scheme from any state to
reset. Typically this is a manual reset from lockout, local or remote.
Reset Time
Range: 0.00 to 655.35 seconds in steps of 0.01
Default: 60.00 seconds
A reset timer output resets the recloser following a successful reclosure sequence. The
setting is based on the breaker time, which is the minimum time required between
successive reclose sequences.
Breaker Closed
Range: any FlexLogic operand or shared operand
Default: Off
This setting selects an operand that indicates that the breaker(s) are closed at the end of
the reset time and the scheme can reset.
Block
Range: any FlexLogic operand or shared operand
Default: Off
This setting selects the operand that blocks the autoreclose scheme (it can be a sum of
conditions such as time delayed tripping, breaker failure, and differential protection). If
the block signal is present before autoreclose scheme initiation, the
FlexLogic operand is set. If the block signal occurs when the scheme is in the reclose-in-
progress state, the scheme is sent to lockout.
Pause
Range: any FlexLogic operand or shared operand
Default: Off
This setting offers the ability to freeze the autoreclose cycle until the pause signal
disappears. This can be done when a trip occurs and simultaneously or previously, some
conditions are detected such as out-of step or loss of guard frequency, or a remote
transfer trip signal is received. The autoreclose cycle is resumed when the pause signal
disappears. This feature also can be used when a transformer is tapped from the
protected line and a reclose is not wanted until it is disconnected from the line. In this
situation, the reclose scheme is 'paused' until the transformer is disconnected.
CONTROL ELEMENTS
AR DISABLED
357