141 / 2024-04-14 21:29:58

The Influence of Nozzle Structures on Asymmetric Interrupting Performance of High Voltage SF6 Circuit Breakers

high voltage circuit breaker; nozzle structure; breaking capacity; physical model

The nozzle structure of the circuit breaker has a direct influence on the gas flow rate, which in turn affects the interrupting performance of the circuit breaker. In this paper, different nozzle structures are simulated based on the simplified enthalpy flow physical model. The effects of different throat width and neck length of SF₆ circuit breaker on arc blowing gas flow and dielectric recovery characteristics are analyzed, and the changes of pressure distribution and dielectric recovery intensity of pressure chamber at zero crossing point of current are compared. The influence rules of nozzle throat width and neck length are obtained. in a certain range, the neck length increases, the breaking capacity increases, the throat width increases, and the breaking capacity increases at first and then decreases, which provides an effective theoretical basis for the design and improvement of SF₆ arc interrupter.