This book is a unified teaching material for the training of electrical technology for network operation in China. According to the requirements of the assessment outline of electrician network operation training. Its contents include electrical theory and power system operation knowledge, as well as operating skills, matters to be understood and electrical safety. , divided into two volumes *** 13 chapter. The first volume 1 to chapter 6 includes the basic knowledge of electrotechnics, knowledge of power system and power grid operation, power transformers, motors, high-voltage electrical appliances and complete sets of devices, low-voltage electrical appliances and complete sets of devices.