Voltage monitoring relays be formulated for both Single-phase and triple-phase networks. The ones that are employed in triple-phase networks are termed Phase monitoring relays. When the voltage falls down the extreme value, power is reinstalled to the load as the relay be re-energized back and contact is lost.
VMR for single-phase AC/DC voltages
To monitor voltages under AC/DC supply in single-phase, ABB's CM consists of a broad choice of impactful and compacted equipment incorporating onl0.89-inch breadth. The range assimilates relays of over-voltage and under-voltage protection from 3V to 600V. The CM range added in the electrical structure contributes to the highest safety and reliability. The relays have 2 c/o connections, as one device adds up 4 measurement ranges: 3-30V, 6-60V, 30-300V, 60-600V.
Three-Phase Voltage monitoring relays
When in a three-phase system, over-voltage and under-voltage fall as the voltages in all the three phases, elevate and fall simultaneously. To detect whether there is an overvoltage or under-voltage condition, the relay checks the average voltage of all three lines and compares them with the set point of the voltage. If an inadequate sequence of phase or phase loss is found out, a signal is sent out to instruct the LPC.
Voltage monitoring relays not only determine under-voltage or over-voltages but also decode issues such as phase imbalances, phase sequence or phase loss. Voltage monitoring relays with selective delay-off plus delay-on features propose a small gap between pull-in and drop-out voltages called hysteresis in other words. There is no auxiliary power supply mandatory for such relays. Also available with steady delays in time plus 1 LED is provided for indication of relay status of connections and activation of delay time.
Categories Simillar to Voltage Monitoring Relays includes Electromechanical Relays, Solid State Relays and Electrical Relays