Basler Electric BE1-79A 9310200114 - Manual (Page 25)

Recloser Operation
Information about the software-controlled features of the recloser is provided in the following paragraphs.
Reset
A reclosing sequence may be initiated only when the relay is in the reset state. Reset is indicated by the
front panel Reset LED. In order for the relay to reach reset, the controlled breaker must be closed,
indicated by the presence of the 52a, during a three-second period when the reset timer expires. If the
breaker opens prior to this time, the relay will proceed to the next reclosing attempt. If the number of
programmed reclosing attempts has been exhausted, the relay will drive to lockout.
A reset time of zero is used if no reset is desired after a specific reclosing attempt. As an example, for a
first reclose/reset time delay setting of SP-79A1=10,0, the 0 indicates that the BE1-79A will not reset until
after the next non-zero reset time. If the second reclose/reset time delay setting is SP-79A2=30,40, then
the relay will reset at the 40 second point in the timing sequence.
Lockout
Lockout, a state inhibiting relay operation, may be produced by four conditions:
•
Reclose failure
•
Number of breaker openings exceeds the number of programmed reclosure attempts
•
The EXIT command is entered to terminate RS-232 communication
•
Communication access has timed out
Lockout is indicated by the front panel Lockout LED. The S-ALM command allows output C3 to be
programmed to close for a lockout condition. Lockout is terminated when the controlled breaker is closed
(manually or by other means) and remains closed for the duration of the final reset time delay setting.
Reclosing Sequences
A reclosing sequence is initiated by the closure of a 52b contact. A reclosing sequence is indicated by the
In Sequence LED located on the front panel. The BE1-79A provides up to four automatic reclosures.
Each reclose setting is adjustable and has a setting range of 0 to 300 seconds. The number of reclosing
attempts may be limited by adjusting any one of the reclose time delay settings (after the first reclose) to
zero. When a breaker trip occurs at this point in the reclosing sequence, the BE1-79A will time toward
lockout.
Each reclose and reset timer setting begins at time zero when the breaker opens the first time and
initiates the first reclose timer. Typically, this makes the first reclose setting the shortest time setting and
the fourth reclose setting the longest time setting. Figure 3-3 illustrates a BE1-79A reclosing sequence
and the relationship of each reclose setting to the breaker openings.
The flow chart of Figure 3-4 is a simplified representation of reclosing sequence initiation and
progression.
If a reclosing sequence is interrupted by removing power supply voltage from terminal 2 or 8, this will
“freeze” the timing cycle at that point in the reclosing sequence. Freezing the timing sequence will result
in contacts returning to their de-energized state when the BE1-79A power supply is de-energized. Once
voltage is restored to the power supply, timing resumes from the point in the reclosing sequence that the
power supply was de-energized.
9310200893 Rev C BE1-79A Functional Description 3-5