InteliPro, SW version 1.0, ©ComAp – May 2011
InteliPro Application Guide
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The setting is done using the setpoints in the group P<>.
Synchro check (ANSI 25)
This function checks state of synchronism at both sides of the circuit breaker. It is used as a
supplementary function to automatic reconnecting of the other functions to assure that the
synchronous conditions are met before the circuit breaker closes back by the protection relay, or is
unblocked to be closed by some other device. In InteliPro, either L1-L2 phase-to-phase voltage or L1-
N phase-to-neutral voltage is measured on the generator side of the circuit breaker and compared with
the corresponding measured mains voltage. Whether phase-to-phase or phase-to-neutral voltage is
used is decided by the setpoint Basic Settings: Voltage Setup. Synchronous conditions are evaluated
based on the preset window of voltage, frequency and angle match as set in the setpoint group Sync
Check.
AC reclosing (ANSI 79)
The automatic reclosing mechanism is generally used in situation, where temporary nature of the
failure is expected. The protection relay trips the breaker according to the standard protection settings.
As soon as the trip conditions disappear, i.e. the protection senses fault-free situation, the tripping
output deactivates and after a reclosing delay, the reclosing output issues a signal to automatically
reclose the breaker. There may be several reclosure attempts done in case of unsuccessful reclosure
cycle. The setting is done using the setpoints in the group AC Reclosing.
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