超高压交流输电线路对埋地油气管道电磁干扰分析及防护措施OA

The author assessed the electromagnetic interference caused by 500 kV EHV AC transmission lines on nearby buried oil and gas pipelines.A cross-parallel model of the transmission lines and the Guangdong Natural Gas Pipeline Phase Ⅰ project was created using CDEGS software,followed by steady-state and transient interference simulations.By collecting pipeline parameters,transmission line parame-ters,and environmental data,combined with domestic and international standards,a safety assessment method for pipeline AC interference was proposed.The results indicate that during steady-state opera-tion,the maximum interference voltage on the pipeline reached 69.27 V,accompanied by an AC current density of 260.45 A/m2,both of which surpass safety limits.Under fault conditions,the peak contact voltage on the pipeline reached 2 628.75 V,and the coating voltage peaked at 2 628.57 V,posing risks to personnel safety.To address the excessive interference,a mitigation scheme involving the laying of 6 200 m zinc strips combined with solid-state decouplers was proposed,reducing the interference voltage to 7.18 V and the current density to 26.11 A/m2,meeting standard requirements.Technical references are included regarding the planning and protection of parallel projects that include UHV transmission lines,as well as the use of oil and gas pipelines.