The arc voltage in low voltage circuit breakers is directly related to the arc extinguishing performance of the circuit breaker,and the near pole voltage drop of the grating directly affects the magnitude of the arc voltage.Therefore,studying the near pole voltage drop of the grating can provide the assistance for optimizing the performance of the circuit breaker.A simplified experimental device is established,the voltage during the stable arc burning process at a DC current level of 250 A is measured,and the relationship curve between arc voltage and grating spacing is drown.The near pole voltage drop is obtained by fitting the curve.The factors affecting the near pole voltage drop are also explored from the aspects of grating material,thickness and current grade.The experimental results show that the near pole voltage drop of different materials will be different,but the grid thickness and current grade will not affect that.
关键词
低压断路器/铁磁性栅片/电弧电压/近极压降
Key words
low voltage circuit breaker/ferromagnetic grating/arc voltage/near pole voltage drop
维普
万方数据