Answer
Sep 14, 2020 - 02:05 PM
Phase monitor relays are designed for use in a three-phase system. Depending on the model, a phase monitor relay can detect these different types of phase errors: phase loss, phase reversal, phase unbalance, undervoltage, and overvoltage. Phase loss occurs when one of the three phases is no longer present. This can happen due to blown fuses, broken wires, or other problems. A phase reversal is when the phase sequence is not in the proper order, or the reverse order. This can be caused by improper installation or maintenance. A phase unbalance when fluctuation in line-to-line voltage exceeds set parameters. Phase unbalance can occur because of problems with the power supply or connections. An undervoltage or overvoltage error is when the voltage goes too far below or above the normal setting.
