Secondary arc current of ultra-high voltage transmission line with a mixed voltage of 1000/500 kV on a single tower
Secondary arc current of ultra-high voltage transmission line with a mixed voltage of 1000/500 kV on a single tower
复制标题
单塔1000/500 kV混合电压特高压输电线路二次电弧电流
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
T. Yuan
中科院分区：
文献类型：
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作者：
W. Sima;Rongchao Wang;Ming Yang;Qing Yang;T. Yuan
在华东地区特高压电网中，单塔混压多回输电线路建设是一项新颖的输电技术，可以显着减少线路走廊覆盖范围，最大限度地利用塔高，显着提高单位面积输电能力。然而，线路间的电磁相互作用复杂，会对二次电弧电流产生干扰。本研究提出了一种混合塔模型，其中包含 1000 kV 和 500 kV 交流电的双回输电线路。考虑电磁耦合效应，根据电路分析和EMTDC研究其二次电弧电流，以及线路长度、补偿、相序和换位对二次电弧电流的影响。结果表明，西盟至上海特高压混合输电工程1000 kV输电线路产生了较强的二次电弧电流。这一发现值得强调。此外，四回路线路长度对次级电弧电流的影响取决于线路电压额定值。最后，本研究提出了几种可以减少二次电弧电流的方法，例如均匀换线和安装合适的中性电抗器。
Among the ultra-high-voltage (UHV) grids in eastern China, the construction of multi-circuit transmission lines with mixed voltages on a single tower is a novel transmission technology that can significantly reduce line corridor coverage, maximise the use of tower height and significantly improve power transmission capacity per area. However, the electromagnetic interaction between lines is complicated and interferes with the secondary arc current. This study proposes a hybrid tower model that incorporates double-circuit transmission lines with alternating currents at 1000 and 500 kV. Its secondary arc current is investigated according to circuit analysis and EMTDC in consideration of the electromagnetic coupling effect, along with the influences of line length, compensation, phase sequence and transposition on the secondary arc current. Results show that a strong secondary arc current is generated for 1000 kV transmission lines in accordance with the UHV hybrid transmission project from Ximeng to Shanghai. This finding should be emphasised. Furthermore, the influence of quadruple-circuit line length on the secondary arc current depends on line voltage rating. Finally, this study presents several methods that may reduce the secondary arc current, such as transposing lines evenly and installing suitable neutral reactors.