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D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CONTROL ELEMENTS
CHAPTER 7: PROTECTION
Figure 292: Autoreclose scheme closing logic, sheet 2 of 2
Terminal three-pole open
The autoreclose scheme employs dedicated logic to determine if all three poles are
opened at the local terminal. This signal is used in the preceding logic. For single breaker
operation, the breaker status is sufficient to derive this signal. For dual breaker operation
both breakers must either be open or out-of-service. If one breaker has been opened from
a bus protection, the
Bus Fault Initiate
setting can be used to declare the terminal opened
when either breaker is opened. Alternately, a user-defined setting is available to generate
this signal.
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