【摘要】 低压断路器中电弧电压直接关系到断路器的灭弧性能，而栅片的近极压降直接影响电弧电压，因此研究其可以为优化断路器性能提供帮助。搭建简化的实验装置，测量直流电流等级为250 A时稳定燃弧过程的电弧电压，并绘制电弧电压与栅片间距的关系曲线，通过拟合曲线求得近极压降；同时从栅片材料、厚度和电流等级等方面探究影响近极压降的因素。实验结果表明，不同材料的近极压降会有差异，而栅片厚度和电流等级的大小不会对其产生影响。更多还原

【Abstract】 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.更多还原