What To Do If The Voltage Is Unstable

There are two aspects of voltage instability. One is voltage deviation, and the other is voltage fluctuation. Voltage deviation is the "slow" change of the actual voltage amplitude and deviates from the rated voltage in a certain period of time. The deviation is steady-state, which is what we call high or low voltage. The size of voltage deviation mainly depends on the operation mode of the power system, line impedance and changes in active and reactive loads. Voltage deviation is mainly the location of the electrical equipment and the time of operation, such as low voltage at the end of the line and high voltage at night.

How to solve voltage instability

The main measures to improve voltage deviation are: correctly select the transformer ratio and voltage tap; reasonably reduce line impedance; improve power factor, reasonably perform reactive compensation, and automatically switch the capacity of reactive compensation equipment according to voltage and load changes; according to the power system flow distribution, timely adjust the operation mode; adopt load-based voltage regulation means, such as the use of on-load voltage regulation transformers.

Voltage fluctuation is the "sharp" change of the actual voltage amplitude and deviates from the rated voltage in a certain period of time. The deviation is dynamic, which is what we call voltage fluctuations. Voltage fluctuations are mainly caused by impact loads caused by rapid changes in the load of large electrical equipment. The start-up and stop and loading and unloading of large motors, such as steel biting of rolling mills, crane lifting and starting, short circuit during the melting period of arc furnaces, arc ignition of arc welders, starting or climbing of electric locomotives, etc., all have impact loads. The magnitude of voltage fluctuations is mainly determined by the frequency of voltage fluctuations, the magnitude of fluctuations, and the requirements for voltage quality in the workplace. Measures to suppress voltage fluctuations include: increasing the capacity of the power supply system, that is, replacing large-capacity transformers, or having large power grids undertake power supply tasks; increasing the power supply voltage level; using dedicated transformers and dedicated power lines; improving the process and operating level; using dedicated voltage stabilizing equipment, etc.

Causes of voltage instability

The instability of voltage is mainly due to the increase in power load and line reasons (such as too small lines, aging, etc.). So the unstable voltage is related to the large number of electrical appliances, but there are some problems you haven't noticed. First, the single-line load is not evenly distributed, that is, the electrician did not distribute the load ratio on the three-phase wire well, resulting in high voltage on some phases and low voltage on some phases. The solution is to measure the three-phase voltage during the peak period of power consumption to see which phase is stable and connect your home electricity to this phase. Second, the outside power supply and transmission lines are old and outdated, and some joints have poor contact for a long time. This is not a problem you can solve personally. Third, there are large electrical appliances in the circuit, such as large motors. The frequent starting of large motors causes fluctuations in the line voltage. In addition, the frequent use of welding machines is also likely to cause fluctuations in the line voltage. This is mainly because the compensator in the circuit is not enough, which is also the problem of the power supply department. Things.

Main factors of voltage instability

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

2. Faults in the transmission and distribution network, the timely action of the relay protection switch will cause voltage instability. If the action is not timely, then there will be a large-scale power outage;

3. Too much reactive power consumption in the power grid is not compensated enough, which will also cause voltage drops;

4. There are also some problems with power plants, especially the emergence of new energy sources, such as wind power generation and solar power generation. When the wind speed conditions are not enough, the wind farm will cut out of the power grid (that is, it can no longer supply power to the power grid), which will also affect the power grid and the voltage will be unstable.

Causes and solutions for voltage instability

1: There are large factories or large equipment around. When large equipment is running, the surrounding power will suddenly weaken.

Solution: Use a wide-range voltage stabilizer to solve it.

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

Solution: Use Wide Range Voltage Stabilizer to solve

3: The power supply transformer is too small, and the voltage is not enough during the peak period of electricity consumption.

Solution: This is more difficult to rectify. It is recommended to use a wide-range voltage stabilizer to solve it

4: Another reason is that the power supply wire diameter is too small. If it is your own wire,;

Solution: It is recommended to change to a thicker wire diameter. If you think it is not cost-effective and the project is too large, it is recommended to use a wide-range voltage stabilizer to solve it.