How To Choose The Rated Voltage Of Surge Protector

The electricity we use daily is alternating current, which is transmitted through a very long transmission line and is divided into three-phase electricity and single-phase electricity. Among them, three-phase electricity means that three identical generators emit the same voltage, but the order of power generation is different, so there will be a phase difference. Its transmission method is to transmit with three fixed phase lines, in which the voltage on each phase line is called phase voltage, and the voltage they finally gather is called line voltage. Due to the particularity of three-phase voltage. In addition to three-phase electricity, single-phase electricity is also commonly used. It has only one phase line, so the phase voltage of single-phase electricity is equal to the line voltage.

After understanding the concepts of phase voltage and line voltage, let's go back to the question of how to choose the rated voltage of the surge protector. The rated voltage of the surge protective device is usually compared with the line voltage of the line. Before selecting the rated voltage of the surge protection device, we must determine whether the voltage on the line is phase voltage or line voltage, single-phase electricity or three-phase electricity. If it is the phase voltage of three-phase electricity. The parameter table of the surge protector usually has two data: rated voltage and maximum continuous working voltage. When we choose the voltage, the line voltage should be the same as the rated voltage during normal operation. When overvoltage occurs, ensure that the voltage is less than the maximum continuous operating voltage.