The working principle of three sections of current circuit breaker protection was studied based on the analysis of low voltage vacuum circuit breaker of a bistable permanent magnetic operating mechanism and the microprocessor is treated as the control unit.The full wave Fourier algorithm was used as the measure algorithm to filter the complex environment of high-order harmonic interference and constant DC components,obtaining the fundamental amplitude and microprocessor set value after sending commands to control the thyristor based trigger signal,using the thyristor to control points in the closing coil current on-off.The prototype tests the three sections of the current protection performance and uses the simulation tool MATLAB to analyze the test data.The experimental results show that when the power distribution system fails,the designed controller can realize effective switch in the allowable error range of the circuit breaker,thereby improving the control circuit breaker reliability and enhancing the stability of the distribution system.%分析了低压真空断路器的双稳态永磁操动机构的基础上,以微处理器为控制单元,研究了断路器电流三段保护的工作原理.以全波傅里叶算法为测量算法,滤除复杂环境下的高次谐波干扰及恒定直流分量,得到的基波幅值与微处理器的设定值比较后发出指令控制晶闸管基极触发信号,利用晶闸管来控制分合闸线圈中电流的通断.样机测试了三段电流保护性能,并利用仿真工具MATLAB对测试数据进行了分析.实验表明,配电系统发生故障时,所设计的控制器能够在误差允许范围内对断路器实现有效分合闸,从而提高了断路器控制的可靠性,增强了配电系统的稳定性.
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