Analysis of Radio Interference Measurement Data for 750 kV AC Transmission Lines at High Altitude

doi:10.11930/j.issn.1004-9649.202210028

Abstract

Abstract: In order to build ultra-high voltage AC transmission lines at high altitude, it is necessary to master the corona characteristics of transmission lines at high altitude to guide the transmission lines design. The typical radio interference data of the 750 kV single circuit transmission lines measured at the Guan-ting long-term observation station were analyzed. The study results showed that the radio interference under fair weather was basically below 55 dB, which met the control limit requirements; the measurement results under fog and haze weathers generally had little difference from those under fair weather. The radio interference before and after line outage and line recharged was measured separately, and the radio interference could be used as the criterion to determine whether the transmission lines were powered or not. After the transmission lines were recharged, the radio interference was larger and increased gradually with the time, and decreased after removal of the dust on the conductor surface. The variation characteristics of the radio interference with rainfall and snowfall were obtained. The radio interference spectrum had a tendency of attenuation in the range between 0.15 MHz and 20.00 MHz. The standard spectrum in the lower frequency band between 0.15 MHz to 1.00 MHz was basically consistent with the actual measurement results. With the increase of the frequency, the standard spectrum level was larger than the measurement results, and a closer fitting curve was given.

Key words: 750 kV AC, high altitude, transmission line, radio interference, long-term measurement

ZHANG Yemao, LI Ni, ZHOU Cuijuan, LU Haonan. Analysis of Radio Interference Measurement Data for 750 kV AC Transmission Lines at High Altitude[J]. Electric Power, 2023, 56(2): 77-85.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202210028

https://www.electricpower.com.cn/EN/Y2023/V56/I2/77

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