Factors Affecting Near Pole Voltage Drop of Ferromagnetic Grating in Low Voltage Circuit Breakers
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.
low voltage circuit breakerferromagnetic gratingarc voltagenear pole voltage drop
万方数据
维普
