At high altitudes, the corona discharge of alternating current transmission lines is more severe, and the induced radio interference (RI) level is higher. Foul weather, especially rain, can aggravate RI performance. In this article, to investigate the influence of rain intensity on RI level at high altitudes, an ultra-high-voltage (UHV) corona cage was employed to perform RI measurements for four bundled conductors (4 × LGJ 630, 6 × LGJ 500, 8 × LGJ 500 and 8 × LGJ 630) by using an artificial rain system at an altitude of 2261 m. The RI levels of the four conductors were obtained under fair weather and under 1.5, 2, 6, 12, and 18 mm/h of rainfall. Then, the RI performances of a 1000 kV UHV single circuit lines and a 1000 kV double circuit line on the same tower were calculated using the excitation function approach. Finally, the difference between predicted RI values at high altitude and long-term measurements for operational power lines at low altitude were discussed.

中文翻译：

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降雨强度对高海拔地区HVAC导线束无线电干扰的影响

在高海拔地区，交流输电线路的电晕放电更加严重，感应无线电干扰（RI）级别也更高。恶劣的天气，尤其是雨天，可能会加剧RI的性能。在这篇文章中，为了研究降雨强度对高海拔地区RI水平的影响，我们采用了超高压（UHV）电晕笼对四个捆绑导体（4×LGJ 630、6×LGJ 500， 8×LGJ 500和8×LGJ 630）通过在2261 m的高度上使用人工雨水系统。四根导体的RI水平是在晴天和1.5、2、6、12和18 mm / h降雨下获得的。然后，使用激励函数方法计算了同一塔上的1000 kV特高压单回线路和1000 kV双回线路的RI性能。最后，