高压直流接地极放电对管道的干扰,可能造成引压管放电或者绝缘卡套烧穿、阴极保护设备及电涌保护装置毁坏、电压过高对操作人员安全构成威胁等风险。根据识别出的管道阀室风险,综合高压直流干扰对管道阀室设备、设施影响的安全边界条件,明确了阀室的缓解目标。提出了针对性的有效可行的综合防护措施,包括优化绝缘卡套安装位置和减少卡套数量、采用耐受性能强的整体型绝缘接头、提高阴极保护设备耐受性、采用限压等电位连接保护装置、采用锌包钢接地材料、采用线路锌带接地排流等,能有效防控高压直流电影响区域的阀室风险。

The interference of HVDC grounding electrode discharge on the pipeline may lead to the discharge of impulse line or the burning through of insulation sleeve, the destruction of cathodic protection equipment and surge protection device,and the threat of high voltage to the safety of operators.According to identified risk of pipeline and valve chamber, the safety boundary conditions of equipment and facilities of valve chamber in HVDC influence area have been integrated and the relief target of valve chamber is defined.Meanwhile, corresponding measures for effective prevention and risk control of valve chamber have been worked out, including: optimize the installation position and quantity of insulation sleeve from the process,adopt the integral insulation joint with strong tolerance,voltage limiting equipotential connection protection,adopt zinc clad steel grounding electrode,pipeline current drainage using zinc strip, etc, which can put the valve chamber with HVDC under effective control.