What Is The Difference Between Wide Range And Ordinary Voltage Stabilizers?

Q: What is the difference between Wide Range Voltage Stabilizer and ordinary voltage stabilizers?

A: Generally, only wide-range voltage stabilizers (excluding the ground wire, which is called a three-phase five-wire system) are used in practical applications, and ordinary ones are not used.

In addition to the three live wires, the wide-range voltage stabilizer has a fourth wire called the neutral wire (note: only single-phase has a neutral wire, not three-phase), and the neutral wire plays a role in ensuring that the load phase voltage remains constant.

If the loads connected to each of the three-phase circuits are the same, the sum of the currents flowing through the neutral wire at each moment is zero, and it is possible to remove the neutral wire and use ordinary power supply. But this is an ideal situation. In fact, the three-phase load formed by connecting multiple single-phase loads to a three-phase circuit cannot be completely symmetrical. In this case, the neutral wire is particularly important and is not dispensable.

If there is no neutral wire when the load is asymmetrical, an ordinary power supply for an asymmetrical load is formed. Due to the asymmetry of the load impedance, the phase current is also asymmetric, and the load phase voltage is naturally not symmetrical. Some phase voltages may exceed the rated voltage of the load, and the load may be damaged (the bulb of this phase is too bright and burns out); some phase voltages may be lower, and the load cannot work properly (the bulb is dim). As the lights are turned on and off, the impedance of the load of each phase changes. The phase current and phase voltage change accordingly, the lights flicker, and other electrical appliances cannot work properly or even get damaged. Therefore, there must be a neutral line, that is, a three-phase four-wire system.