特高压直流输电线路对电信线路电磁影响调研分析

Investigation and Analysis on Electromagnetic Impact of UHVDC Power Transmission Lines on Telecommunication Lines

随着特高压直流线路工程建设速度的加快,需合理解决直流输电线路与电信线路电磁兼容问题。结合近年来已运行的?800 kV向家坝—上海等3项直流线路工程,对工程设计单位和电信部门调研、回访;进而对电信线路分布、允许值、计算方法、防护措施等情况进行了分析和评估。结果表明,特高压直流线路对电信线路磁危险影响较大,采取防护措施的电信线路较多;按电信线路敏感系数确定干扰影响允许值,符合我国现阶段国情。本次调研分析为《直流架空输电线路对电信线路危险和干扰影响防护设计技术规程》行业标准的修订提供了依据。

With the accelerated pace of the construction of UHVDC transmission projects,it is necessary to cope with the electromagnetic compatibility between UHVDC transmission lines and telecommunication lines.The survey and revisit of three UHVDC transmission projects put into operation in recent years,such as ±800 kV DC transmission project from Xiangjiaba to Shanghai and so on,are conducted; and further the distribution of telecommunication lines,the allowable value and its computational method of electromagnetic interference as well as the protective measures for them are analyzed and assessed.Analysis and assessment results show that UHVDC transmission projects impact telecommunication lines greatly and there are lots of telecommunication lines adopt protective measures; it conforms to national conditions of China at the present stage to decide the allowable values of disturbing influences according to the sensitivity coefficients of telecommunication lines.Results of the presented survey and analysis provide the basis for the revision of the industrial standard ＂Technical Code for Designing of the Telecommunication Lines against Danger Effects from Overhead DC Power Transmission Lines＂.