高海拔地區特高壓直流輸電線路電磁環境研究
袁飛1,吳志明1,賈國富2
(1 中國能源建設集團江蘇省電力設計院有限公司,江蘇 南京 211100;
2 國網青海省電力公司黃化供電公司,青海 黃南藏族自治州 811200)
摘 要:為了研究高海拔地區特高壓直流輸電線路電磁環境影響,青海—河南±800kV特高壓直流輸電工程的工程組基于西藏高海拔試驗線段的數據,對合成場強、無線電干擾、可聽噪聲等進行分析。對工程試驗進行了闡述,并給出了工程技術邊界的確定。實驗結果表明,高海拔地區對電磁環境產生不利影響,在工程應用上,需要進行相應的海拔修正,對于合成場強控制的對地距離,每升高1000m海拔對地距離增加6%;對于無線電干擾,以1000m為基準,海拔高度每增加300m,無線電干擾限值增加1dB;對于可聽噪聲,海拔每增加1000m,可聽噪聲增加2.2 dB 進行修正。
關鍵詞:高海拔;特高壓直流;電磁環境;合成場強;無線電干擾;可聽噪聲
中圖分類號:TM752 文獻標識碼:A 文章編號:1007-3175(2021)01-0017-07
Electromagnetic Environment of UHVDC Transmission
Lines in High Altitude Areas
YUAN Fei1, WU Zhi-ming1, JIA Guo-fu2
(1 China Energy Engineering Group Jiangsu Electric Power Design Institute Co., Ltd, Nanjing 2111 00, China;
2 State Grid Qinghai Electric Power Company Huanghua Power Supply Company,
Tibetan Autonomous Prefecture of Huangnan 811 200, China)
Abstract: In order to study the electromagnetic environment impact of UHVDC transmission lines in high altitude areas, the Qinghai—Henan ±800 kV UHVDC transmission engineering group based on the data of high altitude test lines in Tibet analyzed the synthetic field intensity,radio interference, audible noise, etc.The engineering test is explained, and the determination of the engineering technology boundaryis given. The experimental results show that high altitude has a negative impact on the electromagnetic environment. In engineering applications,the corresponding elevation correction is required. For the distance to the ground controlled by the synthetic field intensity, the distanceto the ground increases by 6% for every 1000m. For radio interference, the limit value of radio interference increases by 1dB for every300m increase in altitude, taking 1000m as the reference. For audible noise, for every 1000m increase in elevation, the audible noise increases by 2.2 dB for correction.
Key words: high altitude; UHVDC; electromagnetic environment; synthetic field intensity; radio interference; audible noise
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