城市轨道交通专用轨回流系统直流接地保护方案
黄辉
DC Ground Protection Scheme of Urban Rail Transit Special Return Rail System
HUANG Hui
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作者信息:中铁第四勘察设计院集团有限公司， 430063， 武汉
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Affiliation:China Railway Siyuan Survey and Design Group Co., Ltd., 430063, Wuhan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.12.038
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中图分类号/CLCN:U223.8+2
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栏目/Col:应用技术
摘要:
基于城市轨道交通常规走行轨回流系统，分析了专用轨回流系统的特点，并针对接触网+回流轨牵引供电系统和供电轨+回流轨牵引供电系统，阐述直流接地漏电保护装置的工作原理。接触网+回流轨牵引供电系统直流接地保护方案在变电所直流负极与地之间设置接地漏电保护装置，在直流系统正极对负极、架空地线、钢轨、车辆壳体等各种短路故障中可实现选择性保护；供电轨+回流轨牵引供电系统采用64D接地漏电保护装置，通过一系列改进，可切除故障回路，实现选择性保护。
Abstracts:
Based on the urban rail transit conventional running rail return system, the characteristics of special rail return system are analyzed. Targeting catenary+return rail traction power supply system and power supply rail+return rail traction power supply system, the working principle of DC ground electricity leakage protection device is elaborated. In the catenary+return rail traction power supply system DC ground protection scheme, the ground electricity leakage protection device is set up between substation DC negative pole and ground, it is capable to perform selective positive pole is capable of selective protection of various short-circuit faults in the DC system like positive to negative, positiue to overhead ground wire, positive to steel rail and vehicle shell. The power supply rail+return rail traction power supply system adopts 64D ground electricity leakage protection device, through a series of improvement, it can be cut off the fault circuit to realize selective protection.
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