江西天然气管道交流干扰检测与防护

江西省天然气有限公司所辖管道存在多处与高压输电线路或电气化铁路相邻的情况，为了全面评价管道的交流干扰风险，参照欧洲标准DDCEN—TS15280—2006及国家标准GB／T50698—2011，进行了交流干扰的初步检测和详细检测，检测参数包括交流干扰电压、交流电流密度、交直流电流密度之比及土壤电阻率。选取交流干扰严重位置，通过开展现场缓解试验和设计计算，确定了交流干扰防护方案：在干扰严重位置与管道平行铺设锌带缓解线，并在缓解线和管道之间串接去耦合器。设计方案实施后，获得了理想的防护效果，可为同类工程提供参考。（图6，表4，参10）。

Detection and prevention of AC interference in Jiangxi Natural Gas Pipeline

Several sections of a pipeline operated by Jiangxi Natural Gas Co. Ltd., are close to high-voltage power line or electrified railway. In order to comprehensively evaluate the AC interference risk of these pipe sections, preliminary and detailed detection on AC interference have been conducted according to the European DD CEN-TS 15280-2006 and China GB/T 50698-2011. The detection parameters include AC interference voltage, AC density, the ratio of AC density to DC density and soil resistivity. The places seriously influenced by AC interference are selected to conduct the field remission test and design calculation. The AC interference prevention scheme is established accordingly. In the places where the pipes are severely interfered, the zinc remission strip is laid parallel to the pipes, and the decouplers are installed between the remission strip and the pipeline. A good protection effect has been realized after the implementation of the design scheme, which can provide a reference to the other similar projects. （6 Figures, 4 Tables, 10 References）