摘要
直流接地极线路是直流输电系统的重要组成部分,对其开展带电作业对于保障直流输电系统的可靠运行具有重要意义。该文通过计算得到接地极线路的最大接地故障过电压为288 kV。针对接地极线路的带电作业间隙进行了操作冲击放电试验,采用惯用法计算得到了带电作业最小安全距离为0.65 m。在安全防护方面:由于带电作业时的人体体表场强低于240 kV/m的限制,作业人员无需进行电场防护;但作业人员和绝缘工具需考虑单极大地运行时高温导线的影响,应采取隔热措施,为了保证安全,建议采用绝缘杆作业法,若需采用直接作业法,则应采取必要的安全距离控制措施。
The DC grounding system is one of important parts in DC transmission system.In order to ensure the relia-ble operation of DC transmission systems,it is necessary to develop live worlking tools for UH V grounding systems.In this paper,the overvoltage of grounding faults on BP and GR modes is calculated firstly and the ma ximum ampli-tude is 288 kV.Then,the switching impulse flashover tests are carried out in live working air gaps of a simulation tower.The routine method is employed and the live working safety distance is calculated as 0.65m.In addition,for the electric field strength at the surface of live working workers is generally less than 240 kV/m,the additional protection is not required for such eletric field.Nevertheless,thermal insulation measures should be adopted due to the influence of high-temperature wire on the operating personnel and insulation tools.It is recommended to use the insulated rod operation method.Otherwise,necessary measures should be taken to ensure the safety distance when the direct work method is selected.
作者
崔建业
赵乐冰
陈智伟
程磊
潜力群
CUI Jianye;ZHAO Lebing;CHEN Zhiwei;CHENG Lei;QIAN Liqun(State Grid Jinhua power supply co—pany,Jinhua 321000;School of Electrical Engineering,Hohai Universty,Nanjing 210098,China;State Key Laboratory of Power Grid Environmental Protection,Wuhan Branch of China Electric Power Research Institute,Wuhan 430074)
出处
《电力科学与技术学报》
CAS
北大核心
2020年第1期176-180,共5页
Journal of Electric Power Science And Technology
基金
国家电网浙江省电力公司科技项目(5521JH150181)。
