天然气输送管道作为社会发展的能源动脉,确保其安全运行具有重要意义。根据现有案例及实验分析,研究高压直流接地极放电对输气阀室仪表的影响,得到绝缘卡套接头在受到高压直流干扰的情况下会出现电弧及烧毁的结论,压力变送器、温度变送器、电子控制单元和RTU在接地良好的情况下,不会受到高压直流电流的影响。建议从源头控制高压直流的干扰强度,保证干扰电压在绝缘卡套接头的允许值范围内;采用耐受性能更好的绝缘卡套接头,并改变安装位置,提高抗风险能力，以保证天然气输送管道的安全运行。

 Oil and gas transportation pipeline is the energy artery of social development and it is of momentous significance to ensure the safety of pipeline operation.According to the existing cases and experimental analysis, the influence of HVDC grounding electrode discharge on the automatic control instrument of line valve chamber of natural gas pipeline is studied.The conclusion is drawn that arc and burn-out will occur to the insulation sleeve joint under the interference of HVDC.Pressure transmitter, temperature transmitter, electronic control unit and RTU are not affected by HVDC current when grounding is good. It is suggested that the interference intensity of HVDC should be controlled from the source to ensure that the interference voltage is within the allowable range of the insulation sleeve joint,and insulation sleeve joint with better tolerance should be adopted, and the installation position should be changed to improve the risk resistance.