Basler Electric BE1-851 - Manual (Page 85)

Inputs and Outputs
Reclose Initiate (RI)
The RI input is used with the 52 status input to start the reclose timers at each step of the reclosing
sequence. To start the automatic reclose timers, the RI input must be TRUE when the breaker status
input indicates that the breaker has tripped. To ensure that the RI input is recognized, a recognition
dropout timer holds the RI input TRUE for approximately 225 milliseconds after it goes to a FALSE state.
This situation might occur if the RI is driven by the trip output of a protective function. As soon as the
breaker opens, the protective function will drop out. The recognition dropout timer ensures that the RI
signal will be recognized as TRUE even if the breaker status input is slow in indicating breaker opening.
Figure 4-31 illustrates the recognition dropout logic and timing relationship.
Figure 4-31. 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) output is TRUE.
• The maximum reclose cycle time is exceeded.
9289900990 Rev R BE1-851 Protection and Control 4-29