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煤炭工业中电气设备运行安全性能的提高,直接与保护切断装置的完善有关。保护切断装置用来防止人身触电和防止变压器中性点绝缘三相电网中的对地漏电流听引起的其他危险(火灾、矿井大气爆炸等)。进一步提高保护切断装置技术水平的途径之一是扩大它所完成的功能和使之能适用于各种温度状态和气候条件。目前所要求的工作温度范围是很大的。这是因为在使用通用的电路和结构时,保护
Improve the safety performance of electrical equipment in the coal industry, directly related to the improvement of the protection and cutting device. Protection cut-off device is used to prevent personal electric shock and to prevent other risks (fire, mine atmosphere explosion, etc.) caused by earth leakage current in the three-phase power network of transformer neutral point. One of the ways to further improve the technical level of protection and shut-off devices is to expand the functions it performs and to adapt it to various temperature conditions and climatic conditions. The current required operating temperature range is significant. This is because when using common circuits and structures, protection