1问题的提出 在经济发展的基础上,现代城市人口大量增加,地域不断扩大,使近几年我国地铁建设领域有了前所未有的发展。然而,随着上海地铁一号线延长线建设的立项,上海地铁一号线供电系统设备在招标中一个突出的问题暴露了出来——保护系统与监控系统之间的 1 PROBLEM PROPOSAL On the basis of economic development, the population of modern cities has increased substantially and the geographical expansion has continued. In recent years, there has been an unprecedented development in the field of subway construction in our country. However, with the approval of the extension project of Shanghai Metro Line 1, a prominent problem in the bidding of Shanghai Metro Line 1 power supply system equipment was revealed - between the protection system and the monitoring system