Standby generator set: In the normal case, the power required by the user is supplied by the mains, and when the mains is cut off or the power is interrupted for other reasons, the generator set is set up to ensure the basic production and life of the user. Such generator sets are mainly located in telecommunications departments, hospitals, industrial and mining enterprises with tight supply of electricity, airports and TV stations. This kind of unit maintains the standby state at any time, can provide the continuous power supply to the non-constant load. With the development of science and technology, some power users and electrical equipment have higher and higher requirements for the reliability of power supply. In order to ensure the reliability of power supply, some important users such as hospitals, data centers, and communication hubs have set up standby generators in their power supply systems in addition to dual power supply (ATS), and some even set up UPS. To ensure unin