受高压交流输电线路接地极影响，三层聚乙烯防腐蚀层（3LPE）管道容易受到较强的交流干扰，通常采取"固态去耦合器+接地极"的减缓措施。通过对交流减缓效果、阴极保护效果、排流影响范围、直流漏流量等现场参数进行测试，全面介绍了一种固态去耦合器性能评价方案，并指出现有固态去耦合器在使用过程中存在过度设计及故障电流下铜接地极易出现电偶腐蚀等风险。

"Solid state decoupler + copper grounding", as a common AC mitigation measurement, is often used in underground pipelines which are coated with three layer polyethylene coating and affected by grounding of adjacent high voltage AC transmission lines. A comprehensive solid state decoupler evaluation is introduced by means of the field parameter test of AC mitigation performance, cathodic protection and DC leakage. The risk of excessive design and copper grounding prone to galvanic corrosion is also pointed.