The structure is to install all the configured components on a frame similar to a high-voltage switch cabinet, and the cabinet door is made of steel plate or galvanized steel plate mesh. The device consists of three parts: the reactor cabinet, the discharge cabinet and the capacitor cabinet. The device has the characteristics of neat appearance and convenient installation. This structural form is suitable for indoor installations with voltage levels such as 6kV, 10kV, and 20kV, and a capacity ranging from 300kvar to 3000kvar. Standardized and integrated design, small footprint and easy installation.