Equivalence of mechanical operation test for circuit breaker filled with SF6 or N2
                                        GU Genquan, NIE Haiquan, WANG Yahui, ZHANG Chaohui, ZHANG Quanmin
                                                         (Henan Pinggao Electric Co.,Ltd., pingdingshan 467001, China)

Abstract: Aiming at the equivalence problem of mechanical operation test of circuit breaker filled with N2 instead of SF6, the equivalent conditions for the mechanical operation test were proposed. The verification methods of equivalent conditions were analyzed. The motion characteristics of the operating mechanism and the interrupter of the circuit breaker were tested at the same time. The method and results of the calculation of the mechanical characteristics of the circuit breaker were used to compare and analyze the set equivalent conditions. The influence of the elastic deformation of the transmission parts on the mechanical stroke characteristics and speed characteristics of the circuit breaker was considered in the calculation, and the elastic deformation and force of the transmission parts during operation were calculated and compared. The influence of the energy change of N2 and SF6 during compression or expansion on the pressure characteristics of the arc extinguishing chamber was analyzed. The results indicate that the method of mechanical operation test meets the set equivalent conditions. The calculation analysis method can be used as a design tool for comparative analysis of test equivalence.

Key words: circuit breaker; SF6; N2; equivalence; mechanical properties