介绍了上海地铁直流电缆的敷设方式和环境，在统计历史故障的基础上对直流电缆故障进行了分类，提出了在新线建设和改造项目中，尽可能采用带铠装的软电缆；通过在线检测手段，建立专家评估系统，评定绝缘的优劣并预警其劣化的趋势；改进直流电缆敷设质量，改善
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