The main loads of the electronics factory are placement machines, lithography machines, wave soldering and assembly lines, etc.; the main loads of the communications industry are generally switches, air conditioners and fans. Since the load is mainly on the low-voltage side, small and medium-sized enterprises generally use 10kV power input. Some large-scale enterprises may also use 35kV power input to distribute electrical energy to various electrical loads through secondary step-down or direct distribution power supply. The electronic communication industry has high requirements for power quality, and voltage fluctuations or harmonics have a greater impact on the yield rate, especially short-term voltage interruptions will bring greater economic losses to enterprises.