GE D90 Plus Instruction Manual page 301

CHAPTER 7: PROTECTION
Multi-shot operation
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
and the mode selected. After the dead time interval the scheme will assert the
or operands, as determined by the sequence selected. These operands
BKR 1 AR CLOSE BKR 2
are latched until the breaker closes or the scheme goes to reset or lockout.
Figure 229: Autoreclose scheme breaker close logic
Figure 230: Autoreclose scheme close breaker 1 or 2 logic
Figure 231: Autoreclose scheme termination
The
Maximum Number of Shots
reclose the shot counter is incremented.
If
Maximum Number of Shots
At reclosing, the fault is again detected by protection and reclose is initiated. The breaker is
tripped three-pole through the
operand. Because the shot counter has reached the maximum number of shots permitted,
the scheme is sent to the lockout state.
If Maximum Number of Shots
At reclosing, the fault is again detected by protection and reclose is initiated. The breaker is
tripped three-pole through the
operand. After the second reclose the shot counter is set to 2. Upon reclosing, the fault is
again detected by protection, the breaker is tripped three-pole, and reclose is initiated
again. Because the shot counter has reached the maximum number of shots permitted,
the scheme is sent to the lockout state.
setting defines the number of reclose attempts. After each
is set to "1", the shot counter is set to 1 upon the first reclose.
operand that will set the
AR SHOT COUNT >0
is set to "2", the shot counter is set to 1 upon the first reclose.
operand that will set the
AR SHOT COUNT >0
CONTROL ELEMENTS
AR CLOSE
AR FORCE 3P
AR FORCE 3P
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