Any place where a low-voltage transformer is installed and next to large electrical equipment should be equipped with a reactive power compensation device (this is a regulation of the national power department), especially those in industrial and mining, enterprises, and residential areas with low power factors must be installed. Large asynchronous motors, transformers, welding machines, punch machines, lathe groups, air compressors, presses, cranes, smelting, steel rolling, aluminum rolling, large switches, electric irrigation equipment, electric locomotives, etc. are especially needed. In addition to incandescent lighting in residential areas, air conditioners, refrigerators, etc. are also consumers of reactive power that cannot be ignored. The power supply situation in rural areas is relatively poor. Most areas have insufficient power supply, large voltage fluctuations, and particularly low power factors. Installing compensation equipment is an effective measure to improve the power supply situation and increase power utilization.