4-60 BE1-951 Protection and Control 9328900990 Rev L
Figure 4-54. Recognition Dropout Timing
Breaker Status (STATUS)
This input is used to indicate to the recloser function block that the breaker is closed. A TRUE signal at
this input indicates a closed breaker.
Reclose Wait (WAIT)
A TRUE signal at this input disables the reclosing function. In this condition, recloser timing is interrupted.
When this input returns to a FALSE state, reclosing is enabled and recloser timing resumes.
Drive to Lockout/Block Recloser (DTL/BLK)
When TRUE, this input forces the reclosing function into the Lockout position. Lockout persists for the
period defined by the Reset time after the DTL/BLK input becomes FALSE and the breaker is closed.
Close (79C)
The 79C output becomes TRUE at the end of each reclose time delay and remains TRUE until the
breaker closes. Any of the following conditions will cause the 79C output to become FALSE:
• The STAT input indicates that the breaker is closed.
• The reclose fail timer times out.
• The recloser goes to Lockout.
• The WAIT logic is asserted.
Recloser Running (79RNG)
The 79RNG output is TRUE when the reclose is running (i.e., not in Reset or Lockout). This output is
available to block the operation of a load tap changer on a substation transformer or voltage regulator
during the fault clearing and restoration process.
Lockout (79LO)
This output is TRUE when the recloser is in the Lockout state. It remains TRUE until the recloser goes to
the Reset state. The recloser will go to Lockout if any of the following conditions exist:
• More than the maximum number of programmed recloses is initiated before the recloser returns
to the Reset state.
• The DTL/BLK input is TRUE.
• The Reclose Fail (79F) is TRUE.
• The maximum reclose cycle time is exceeded.
Reset Timer (79RST)
The 79RST output provides reset indication and is TRUE when the recloser is in the reset position.
Sequence Control Block (79SCB)
This output becomes TRUE when either the 52 status input OR the 79C input is TRUE AND the
sequence operation (shot counter) matches one of the programmed steps of the S<g>-79SCB command.
Figure 4-55 illustrates 79SCB logic.
Figure 4-55. 79SCB Logic
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