高压直流输电入地电流对地电场观测设施的腐蚀分析

Corrosion analysis of HVDC discharge current on geoelectric field observation facilities

随着高压直流输电线路的大规模建设,其形成的接地极放电电流对电场观测设备产生持续影响,并可能对埋地设备产生影响。基于入地电流对金属设施的面腐蚀量公式,对上海区域3个地电场台站的接收信号进行分析,确定接地极放电电流(高压直流接地极放电信号)在地电场观测信号中的特征和强度,计算多个距离范围内特定接地极放电电流强度对金属设施的腐蚀量,结合目前的接地极放电电流强度、放电时间和接地极与设施的距离,认为高压直流输电入地电流对固定台站埋地设施的影响较小;但是,当进行近距离、长时间的特定观测时,高压直流输电入地电流会对埋地设备造成较为严重的影响。

With the large-scale construction of HVDC transmission lines,the geoelectric field observations and observation equipment are continuously influenced by the stray currents generated by ground electrodes.Whether the stray current will affect buried equipment is a question worth studying.Based on the surface corrosion amount formula of metal current to metal facilities,this study determines the characteristics and intensity of stray currents in the electric field observations and calculates the amount of corrosion to metal facilities at a specific ground electrode discharge current intensity over multiple distances by analyzing the stray current discharge signals of HVDC received at four electric stations in Shanghai area.In conclusion,combining the discharge intensity,discharge time,and distance between the ground electrode and facilities,the effects on the underground facilities at fixed stations are relatively small.However,when there are close,long time,and specific observations,it will cause more serious effects on buried equipment.