表面涂层在输电线路导线防晕处理中的应用

发布时间：2018-04-16 01:03

本文选题：表面缺陷 + 涂层　；参考：《高电压技术》2014年07期

【摘要】：超/特高压输电线路导线在运输、施工过程中可能会发生碰撞导致导线刮伤或者导线本身就存在缺陷如突出金属物等,形成局部电晕放电源。为此针对人工磨损导线采用喷涂涂层的方式展开电场仿真研究;基于小电晕笼对LGJ400-50导线电晕特性进行试验研究,采用人工划痕和涂污两种方式模拟导线可能存在的缺陷,应用紫外成像仪观察磨损导线喷涂涂料前后电晕放电过程的变化。绞线电场仿真结果表明:划痕和凸起两种典型的导线表面缺陷时会严重畸变导线周围电场,使表面最大场强分别达到原来的1.29和2.19倍,而采用喷涂涂层的方法可以有效的降低绞线表面最大电场强度达51%和62.4%。试验结果表明:涂覆RTV涂料后起晕电压升高约21.9%和39.2%,相同的电压下导线电晕放电强度明显减弱,涂层在导线防晕处理中起到了较好的效果。
[Abstract]:In the transportation of ultra / UHV transmission line conductors may collide during construction and lead to wire scratches or defects such as protruding metal objects to form local corona discharge power supply.For this reason, the electric field simulation study is carried out on the artificial wear wire by spraying coating, and the corona characteristic of LGJ400-50 conductor is tested based on the small corona cage, and the possible defects of the wire are simulated by artificial scratch and smear.The changes of corona discharge process before and after wear wire spray coating were observed by ultraviolet imager.The simulation results show that the electric field around the wire will be seriously distorted when the two typical wire surface defects are scratched and raised, and the maximum field intensity of the surface reaches 1.29 and 2.19 times of the original one, respectively.Spraying coating can effectively reduce the maximum electric field intensity by 51% and 62.4%.The experimental results show that the post-corona voltage of RTV coating increases by 21.9% and 39.2%, and the corona discharge intensity decreases obviously at the same voltage, and the coating plays a better role in the anti-corona treatment of conductors.
【作者单位】：华北电力大学河北省输变电设备安全防御重点试验室;国网河北省电力公司电力科学研究院;国网公司长沙市供电公司;
【基金】：国家自然科学基金(51277073) 国家高技术研究发展计划(863计划)(2012AA050802)~~
【分类号】：TM75

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