【摘要】 对环路供电系统进行了描述,着重分析了环路网络中通过二极管隔离时的电流分配状况,从原理上进行了说明;阐述了环路系统对直流系统安全性的影响以及给直流系统接地查找所带来的困扰。依据不同的系统状况与实施情况提出了三种工程解决方案:(1)采用电气互锁的直流接触器或自动转换开关电器切换供电;(2)把构成环路的两条馈线穿过同一个互感器供电;(3)装置采用一主一备的两路隔离电源供电方案。并对这三种方案的优缺点进行了对比分析,提出在实际工程中根据不同的负载和环路情况,采取上述方案的组合来解决环路接地问题。更多还原

【Abstract】 This paper describes loop power supply system and emphasizes theoretically the loop network when the current through the diode distribution of isolation.And it furtherly elaborates the DC loop system of system security and difficulties caused by the DC system ground detecting.According to different system conditions and the implementation of three projects it proposes solutions:(1) using electrical interlocking DC contactor or switching power supply automatically to transfer switching equipment;(2) constituting a loop through the two feeder power supply with a transformer;(3) the device adopting a master-and-standby two-way isolated power supply program.The advantages and disadvantages of these three programs are compared.In the actual project and loop under different load conditions,a combination of the above programs is needed to solve ground loop problems.更多还原