With the continuous development and progress of society, great changes have taken place in China's urban power grid. Most cities have formed or are forming many power load intensive areas. In the past, the power supply from substation 12 / 24kV line (or branch line) to direct users has been difficult to meet the needs of urban residents. Therefore, a new power supply mode is produced to supply power to users through the switching station. The switching station does not need to be built by a person, and covers a small area. The configuration is very flexible, the power supply mode is more reliable, the construction, installation and commissioning time are greatly shortened, and the overall cost is reduced.

With the development of modern industry, the degree of automation and intelligence of electrical control equipment is becoming higher and higher. Using modern electronic technology, sensor technology, communication technology and computer network technology to integrate the monitoring, protection, control and measurement of power equipment under normal and accident conditions to achieve good management has become an inevitable trend and development direction.