The invention relates to a neutral-section passing system. The neutral-section passing system comprises a permanent magnetic mechanism switch, a neutral-section passing controller and a permanent magnetic mechanism controller. The neutral-section passing controller is used for judging to generate switch-on and switch-off instructions, and the permanent magnetic mechanism controller is used for calculating switch-on and switch-off actuation time. The neutral-section passing controller is connected with the permanent magnetic mechanism controller, and the permanent magnetic mechanism controller is connected with the permanent magnetic mechanism switch. The permanent magnetic mechanism controller comprises a sampling module and an IGBT (insulated gate bipolar transistor) drive module. The sampling module sequentially comprises an acquisition circuit, a rectifying circuit and a zero passage and frequency detection circuit which are connected sequentially. The zero passage and frequency detection circuit comprises a comparator and an isolation drive circuit. The output end of the rectifying circuit is connected with the input end of the comparator. The output end of the comparator is connected with the input end of the isolation drive circuit. The output end of the isolation drive circuit is connected with the output end of the sampling module. The IGBT drive module comprises a switch-on and switch-off coil drive loop and an automatic coil wire breakage detection loop.