(1) The conductive parts and current transformers of the multi-oil circuit breaker are all placed in the iron shell oil tank, and transformer oil is used as the conductive part to insulate the ground, fracture, and phase (three-phase common box type).

(2) The structure is simple, the operation is convenient, and the adaptability to climatic conditions is strong. In the past, it was used more in lower voltage levels.

(3) With a large amount of oil, maintenance is difficult, and there is a danger of explosion and fire. As the voltage level increases, maintenance is more difficult.

(4) The fracture voltage is low. With the increase of the voltage level, there are too many fractures in series for each phase, and the structure of the arc extinguishing chamber is complicated, for example: 35kV 2 fractures, 110kV 4 fractures, 220kV 6 fractures.

Multi-oil circuit breakers are the earliest circuit breakers used in the development of oil circuit breakers. However, with the continuous development of science and technology, the varieties of oil circuit breakers have long been eliminated. At present, my country only retains a few models of 35kV voltage levels to meet the needs of special circumstances.