All places where low-voltage transformers are installed and beside large electrical equipment should be equipped with reactive power compensation devices (this is the regulation of the state power department), especially those industrial and mining enterprises and residential areas with low power factor must be installed. Large asynchronous motor, transformer, electric welding machine, punch, lathe group, air compressor, press, crane, smelting, steel rolling, aluminum rolling, large exchange, electric irrigation equipment, electric locomotive, etc. In addition to incandescent lighting in residential areas, air conditioners and chillers are also the consumption objects of reactive power that can not be ignored. The rural power consumption is relatively bad. In most areas, the power supply is insufficient, the voltage fluctuates greatly, and the power factor is especially low. The installation of compensation equipment is an effective measure to improve the power supply and improve the utilization rate of electric energy.