Basler BE1-25/79TR, Instruction Manual, Page: 9 / 78

BE1-25/79TR General Information
1-3
Figure 1-1. Communication Terminal Screens Flow Diagram
TIMING FUNCTIONS
Control Inputs
Some control inputs (external contact sensing inputs) are associated with both control and timing and may
be used to enable or disable relay functions. An open CE contact sensing input freezes all timers. When
the CE input is closed, the timers resume timing. When PF contact sensing input is closed (enabled), the
breaker is closed (52b open), and both bus and line voltages are dead, PF timing is initiated . When BLK
contact sensing input is closed, high speed reclosing attempts are blocked. When the DTL or DTR input is
closed, the relay is driven to lockout (DTL) or reset (DTR).
Reclosing
Timing for reclosing begins when either the breaker opens (52b closes) with an intitiate contact input (LT1,
LT2, RP1, RP2, or PAR) closed or the high speed reclose (HSR) input closes momentarily (refer to Figure
1-2 for timing relationships). Either of these conditions cause the master timer and all reclose timers to begin
timing. The setting START 52b allows the master timer and reclose timers to start timing only on 52b closing
without an additional initiate contact input closed.
Master timing defines a period of time (window) that a reclose output may be given. One or more reclosings
may be initiated if reclose timers time out during the master timing window. Timer durations are established
by programming the relay using the front panel mounted switches and visual display.
Reclose action occurs when the conditions for reclose are satisfied and the particular reclose timer times
out. Conditions associated with each reclose timer are established during setup. They include live or dead
conditions on the line and bus and also the status of the breaker. PAR reclose timer also includes conditions
for delta voltage and phase angle across the open breaker.