Causes And Solutions For Three-phase Voltage Instability

The main reasons for the instability of three-phase voltage are the increase in power load and the reasons of the line (such as the line is too small, aging, etc.). Therefore, the unstable voltage is related to the large amount of high-power equipment, but there are some problems that you have not noticed, the single-line load distribution is uneven, that is, the proportion of the load on the three-phase wire is not well distributed, resulting in high voltage on some phases and low voltage on some phases, the so-called three-phase power imbalance, the single-phase power is connected to the low voltage of the live wire, and the solution is to measure the three-phase voltage at the peak of power consumption to see which phase is the most stable and has the highest voltage, and you connect the single-phase power to this phase. The power transmission lines are old and aging, and some joints are rusted due to aging and have poor contact. There are large electrical appliances in the circuit, such as large motors. The frequent starting of large motors causes fluctuations in the line voltage. Frequent use of welding machines can also easily cause fluctuations in the line voltage. This is mainly due to the lack of compensators in the circuit, which is also the responsibility of the power supply department.

Four reasons for unstable voltage

1: The existence of large load users, such as factory electricity, will have a great impact on the power grid when they start and stop, and residents around the factory will feel the unstable voltage.

2: It is the peak period of electricity consumption, and everyone turns on the appliances at home. Such as air conditioners, computers, refrigerators, induction cookers, etc. In particular, the high current when air conditioners and induction cookers are started will suddenly weaken the surrounding power.

3: The power transformer is too small, and the voltage is not enough during peak hours. This is difficult to rectify, and the unit or group needs to apply to the power supply bureau, which takes a long time..

4: The power supply wire diameter is too small. There are two stages. 1. The line from the transformer to your meter is too small. This modification is more troublesome. Most of them need to apply to the power supply bureau. 2. The line from the meter to the home is too small. If it is your own line.

Summary: Many of the causes of voltage instability are problems with the power supply source. You need to apply to the power supply bureau for improvement. It requires more procedures and a longer time. If you modify it yourself, it will be very troublesome and costly. It is not cost-effective. You can choose Dynamic Voltage Regulator (DVR).