积灰对输电线路导线电晕特性影响的电晕笼试验分析  

Test Analysis on Effects of Dust Deposition on Corona Characteristics Transmission Lines Using Corona Cage

作　　者：孙涛[1] 万保权 陈豫朝 樊亮[3] 郭浩洲 关庆华 

机构地区：[1]国家电网公司,北京100086 [2]国家电力科学研究院,武汉430074 [3]白银供电公司会宁分公司,会宁730900

出　　处：《高电压技术》2010年第12期2913-2917,共5页High Voltage Engineering

基　　金：国家电网公司科技项目(SG0922)~~

摘　　要：在同一气候条件下,同一档距的电晕特性主要由导线高度和导线表面状况决定,这两者受当地各种气候环境影响。西北地区干旱而且多灰,这可能对750kV线路电晕特性有较大的影响。为了解这一影响,利用国家电网交流特高压试验基地电晕笼,模拟好天气(干燥导线)和雨天(淋雨)情况,对750kV积灰和光洁导线(6×400mm)在不同试验电压(不同表面场强)下的无线电干扰和可听噪声进行了试验测量。结果表明:在750kV示范工程设计的导线表面场强范围内,对于干燥导线,积灰导线产生的无线电干扰和可听噪声值均大于光洁导线所产生的,并且无线电干扰受影响严重,0.5MHz时无线电干扰差值可达20dB;在淋雨情况下,光洁和积灰导线电晕产生的无线电干扰差别不明显,但噪声差别明显,淋雨情况下积灰导线电晕产生的可听噪声约大光洁导线5～8dB。在试验导线表面场强达到一定程度后,积灰对导线电晕特性的影响逐渐减小。The radio interference levels of transmission lines are mainly dependent upon line parameters,climate environment and conductor surface condition.Under the same climate conditions,the radio interference levels from the same span of established power transmission lines are determined by line height and conductor surface condition which is mostly affected by various climate environments.On the basis of corona cage in State Grid UHV AC test base,we simulated the conditions of fine weather for dry conductor and rainy weather for wet conductor,and measured the radio interference and audio noise levels of 750kV 6×400mm conductor wires with dust deposition and cleanness under different test voltages,namely,different conductor surface field strength values.It is revealed that,for dry conductors,within the conductor surface field strength in the design of 750kV model engineering,the radio interference and audio noise levels from the conductor with dust deposition are both greater than those from clean ones,and the radio interference is seriously affected;with the difference of 20dB at 0.5MHz under the same test voltage,for wet conductors,the difference of radio interference from the corona on the conductors with cleanness and dust deposition is not evident,however,the audio noise level of the conductors with dust deposition is higher than that of clean conductors by 5～8dB.The effects of dust deposition on conductor corona characteristics decrease once the conductor surface field strength values are high enough.

关 键 词：积灰导线 无线电干扰 可听噪声 电晕特性 试验 气候 

分 类 号：TM851[电气工程—高电压与绝缘技术]