In order to improve the reliability of underground power supply system, it is necessary to conduct advance pre-control for cable faults, in particular, to strengthen the control of override trip accident, so as to ensure stable power supply during the underground operations and improve the safety factor of the job.%为了提高井下供电系统的可靠性，就必须针对电缆故障提前预控，尤其要加强对越级跳闸事故的控制，保证井下作业期间供电稳定，提高作业的安全系数。
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