THE new PQ1 single-phase power quality sensor/relay from Power Standards Lab is a phase-to-neutral or phase-to-phase monitor suitable for a large range of industrial control applications and was developed by Westek Electronics .
Three relays can be employed for the comprehensive monitoring of a three-phase circuit. The PQ1 detects sags, swells, interruptions and impulses as short as 500 nanoseconds and can be employed on 50, 60 and 400 Hz sources.
Through the use of an external transformer, the PQ1 can monitor voltages to 600 volts. The relay has three relay outputs which can flag impulses/swells, minor sags, and major sags.
There are 16 pre-programmed industry-standard depth/duration response curves covering voltage sags, swells, high-frequency impulses and power interruptions.