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一、国短路故障引发的火灾短路是指相线之间、相零之间直接金属性的电气连接。短路电流通常为数百安，甚至上千安培，在短路点形成电弧，引燃附近可燃物。当短路保护电器设计选用或整定不当或使用了假冒产品，短路保护电器拒绝动作，不能及时切断故障线路，短路电流将使导体产
1. A fire short circuit caused by a short-circuit fault in a country is a direct metallic electrical connection between phase lines and phase zero. The short-circuit current is usually several hundred amps, or even thousands of amps, forming an arc at the short-circuit point, igniting nearby combustibles. When the short-circuit protection device design is selected or improperly set or a counterfeit product is used, the short-circuit protection device refuses to operate, and the fault line cannot be cut off in time. The short-circuit current will make the conductor