GE D90 Plus - Page 352

342 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CONTROL ELEMENTS CHAPTER 7: PROTECTION
Figure 281: Autoreclose breaker close logic
Figure 282: Autoreclose close breaker 1 or 2 logic
Figure 283: Autoreclose termination logic
Multi-shot operation
The Maximum Number of Shots setting defines the number of reclose attempts. After each
reclose, the shot counter increments.
If
Maximum Number of Shots is set to “1,” the shot counter is set to 1 upon the first reclose.
At reclosing, the fault is again detected by protection and reclose is initiated. The breaker is
tripped three-pole through the AR SHOT COUNT >0 operand that sets the AR FORCE 3P
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 is set to “2,” the shot counter is set to 1 upon the first reclose.
At reclosing, the fault is again detected by protection and reclose is initiated. The breaker is
tripped three-pole through the AR SHOT COUNT >0 operand that sets the AR FORCE 3P
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.
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