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What is the definition of ANSI 25 - Synchro-check?

This function checks the voltages upstream and downstream of a circuit breaker and
allows closing when the differences in amplitude, frequency and phase are within authorized limits.

Characteristics

adjustable and independent set points for differences in voltage, frequency and phase
adjustable lead time to take into account the circuit-breaker closing time
5 possible operating modes to take no-voltage conditions into account.