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输电线路因电晕放电引起的电子环境问题时有发生,是影响特高压建设的难题之一。可听噪声和无线电干扰水平是研究输电线路电晕特性的重要参数,随着线路运行年限和运行环境的改变,输电线路可听噪声和无线电干扰水平可能发生变化。笔者针对广东南部地区顺江乙线运行年限16年的LGJ400/50老化后导线的电晕电压变化,利用小型电晕笼这一有效、方便的实验平台展开研究,并利用电子显微镜和白光干涉形貌仪对样品表面状况进行观察。文中通过声级计和无线电干扰接收机观测单根LGJ400/50老化导线和同型号新导线在相同施加工频电压下电晕放电过程,并对比两组数据。结果表明,老化后LGJ400/50导线表面状况比新导线明显恶化,表面成分更为复杂;老化后导线可听噪声水平普遍增加1～5 dB(A);无线电干扰水平增加最大可达10 dB。上述结论为相关部门提供设计、维护建议。
Occurrence of electronic environmental problems due to corona discharge of transmission lines has occurred, which is one of the problems that affect UHV construction. Audible noise and radio interference levels are important parameters for studying the corona characteristics of transmission lines. As the service life of the lines and the operating environment change, audible noise and radio interference levels of transmission lines may change. Aiming at the change of corona voltage of LGJ400 / 50 aging wire after 16-year operation of Shunjiang River Line in southern Guangdong, the author studied the corona voltage using a small corona cage which is an effective and convenient experimental platform. The electron microscope and white light interference Profile instrument to observe the surface condition. In this paper, we observed the corona discharge process of single LGJ400 / 50 aging wire and the same type of new wire by the sound level meter and the radio interference receiver under the same applied power frequency voltage, and compared two sets of data. The results show that the surface condition of LGJ400 / 50 wire deteriorates significantly compared with that of the new wire after aging, and the surface composition is more complicated. The audible noise level increases by 1 ~ 5 dB (A) after aging and the maximum increase of radio interference level is up to 10 dB. The conclusion of the relevant departments to provide design and maintenance recommendations.