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０引言 随着计算机技术的发展，控制系统在线监测更加易于实现。通过对电力系统各种电缆沟火灾事故的分析表明，电缆故障引起火灾导致大面积电缆烧损占很大比例，造成被迫停机，短时间内无法恢复生产，经济损失重大。根据事故分析，引起电缆沟内火灾的直接原因是电缆中间头制作
0 Introduction With the development of computer technology, control system online monitoring easier to achieve. The analysis of various types of cable trench fire accidents in the power system shows that a large proportion of large-scale cable burning caused by a fire caused by a cable fault accounts for a large proportion, causing the machine to be shut down and unable to resume production in a short period of time, resulting in significant economic losses. According to the accident analysis, the direct cause of the fire in the cable trench is the middle of the cable