Three=phase network monitoring arrangement for low voltage and phase failure - has single IC component which detects and evaluates each half wave of all phases

摘要

The electronic arrangement monitors each phase. Each individual half wave is detected and evaluated. All phases are monitored using a single IC component (IC). The mains information is fed into the inputs of the IC component via a line voltage reduction device (LUR). The IC has input protection against overvoltage and changeover. The undervoltage threshold at comparators (KO) in the IC is adjustable via an external adjustment device (EGU). The sensitivity is adjustable via a further external device (EGV1) acting on an internal delay device (VG1). The undervoltage and phase failure signals are either held separate or logically combined at the output (OUT) or outputs (EA1-EA6) of the IC. USE/ADVANTAGE - The arrangement is universally applicable, achieves reliable rapid detection of undervoltage or phase dropout.