在埋地管道阴极保护断电电位测试过程中,固态去耦合器的电容放电会导致断电电位测试结果不准确。从固态去耦合器结构、电容放电特性及放电回路影响因素等方面,分析了固态去耦合器对管道断电电位的影响规律,并通过现场试验验证了交流排流设施会导致管道断电电位测量值负移,明确了固态去耦合器对管道断电电位的影响与电容值、接地极材料、接地极接地电阻、管道通电电位等因素有关,消除固态去耦合器干扰影响最有效的方式是断开固态去耦合器与管道的连接。

During the buried pipeline cathodic protection switch-off potential test, the capacitor discharge of solid-state decoupler could lead to inaccurate switch-off potential test results. From the aspects of solid-state decoupler structure, capacitor discharge characteristics and influencing factors of discharge circuit, the influence of solid-state decoupler on pipeline switch-off potential was analyzed, and the field test verified that AC drainage facilities would lead to the negative shift of the pipeline switch-off potential measurement value, indicating that the influence of solid-state decoupler on the switch-off potential of the pipeline was related to factors such as capacitance value, grounding electrode material, grounding resistance of grounding electrode and switch-on potential of the pipeline. The most effective way to eliminate interference effect of solid-state decoupler was to disconnect solid-state decoupler from the pipeline.