Basler BE1-25/79TR, Instruction Manual, Page: 33 / 78

BE1-25/79TR Functional Description
3-6
SYNC-CHECK FUNCTION DESCRIPTION
Sync-Check
Sync-check function measures the phase angle between single-phase line and bus voltages. If the
measured angle is less than the front panel phase angle window setting, voltage difference is less than the
voltage setting, and the time period defined by the sync time delay has expired, then the sync output contact
closes and front panel 25 LED lights. The allowable phase angle window is adjustable over the range of 1
to 180 degrees. A phase angle window set greater than 180 degrees disables the phase angle limit. The
sync time delay is adjustable over the range of 1 to 999 cycles. The sync-check function is independent of
the master timer and can provide independent synchronism reclosing (refer to Figure 3-2). Available
parameters (refer to Figure 3-3) are:
Phase Window
Condition adjustable from 1 to 180 degrees.
Blocks closing when the phase angle difference between the bus and line are greater than plus
or minus this setting.
Indicated by front panel LED's (LL and LB) when LED's are flashing ON and OFF.
Slip Frequency Window
Condition adjustable between .05 to 1.00 Hz.
Blocks closing when frequency difference between bus and line is greater than plus or minus
this setting.
Indicated by front panel LED's (LL and LB) when LED's are flashing ON and OFF.
NOTE: For 3 phase line and 3 phase bus type relays, only phase B is used for phase window and slip
frequency window check.
Figure 3-2. Independent Synchronism Reclosing