Basler BE1-25/79TR, Instruction Manual

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BE1-25/79TR Functional Description
3-5
RECLOSING FUNCTIONAL DESCRIPTION
High Speed Reclose
There is one high speed reclose (pilot) function with a time delay of 1 to 999 cycles, and is designated HSR
(refer to Figure 5-3). HSR is a momentary input and is latched internally. This function is initiated during
carrier tripping when the breaker is closed. For example, a breaker with a three cycle tripping time and the
HSR delay time set to 25 cycles will give 22 cycles dead time on the line for deionization of arc gases. This
does not take into consideration the breaker closing time. If the breaker has a 12 cycle reclosing time, the
reclosing must be initiated with the HSR delay time set to 13 cycles (25 - 12 = 13). This function is disabled
if a momentary closure of the BLK input is sensed after the momentary HSR input has been sensed.
An adjustable breaker recognition time (BKR RECG) of 8 to 200 milliseconds is available to compensate for
breakers with contact bounce and slower recognition. This setting is adjustable from 2 to 50 (8 to 200
milliseconds) where the actual recognition time is the setting multiplied times 4 milliseconds.
An optional HSR-SYNC enable condition may be enabled in the settings mode to allow the sync output to
supervise the HSR.
In summary, high speed reclosing has an adjustable delay of 1 to 999 cycles and is affected by two contact
sensing inputs (HSR and BLK) and one programmable logic setting (HSR-SYNC).
Parallel (LL-LB Reclose)
There is one reclose with sync-check and voltage monitoring and is designated (PAR). The parallel function
is enabled with a cutout switch external to the relay through contact sensing input PAR. If the breaker is
intended to operate open, this function would be disabled. The parallel function has a time delay of 1 to 999
seconds. This function is initiated with the PAR input when the breaker is open, and both the bus and line
are live. When parallel reclose and sync-check with voltage monitoring is desired, the PAR input and 52b
input must be present, bus and line must be live, difference voltage must be less than the delta voltage
setting, phase angle difference must be less than the phase window setting, and the slip frequency must be
less than the slip frequency window setting. After the parallel time delay has expired, the close output is
energized.
Restore Power (LL-DB Reclose)
There are two restore power functions available to energize a dead bus. These functions are designated
RP1 and RP2 with either or both used in application. Both restore power timers have a time delay of 1 to
999 seconds. The restore power functions are enabled with cutout switches located external to the relay
through contact sensing inputs RP1 and RP2. In order for reclose power output contacts (RP1 or RP2) to
close, the appropriate restore power input and 52b input must be present, the line must be live, the bus must
be dead, and the restore power timer must expire.
Line Test (DL-LB Reclose)
Two line test functions are available. The functions are designated LT1 and LT2, with either or both used
in application. The line test timers have a time delay of 1 to 999 seconds. The line test functions are
enabled with cutout switches located external to the relay through contact sensing inputs LT1 and LT2. In
order for line test output contacts (LT1 or LT2) to close, the appropriate line test input and 52b input must
be present, the line must be dead, the bus must be live, and the line test timer must expire.