多回超/特高压交流输电线路平行架设及交叉跨越情况下的工频电场特性研究

为研究特高压输电线路与超高压输电线路平行架设及交叉跨越情况下的工频电场特性,基于有限元法,建立了超、特高压交流输电线路平行架设及交叉跨越时的数值仿真模型,分析了平行架设时输电线路的间距、对地高度以及相序对工频电场分布特性的影响;交叉跨越时输电线路的交叉角度、对地高度以及相序对于工频电场分布特性的影响,并以实例验证了模型的合理性。结果表明,导线对地高度对工频电场影响较大,随着交叉角度及线路间距的增大,两种架设情况下导线下方工频电场幅值逐渐减小,错序排列时线路下方高场强区域较少。

Study on Power Frequency Electrical Field Characteristics of Multi-turn UHV/EHV Transmission Lines in Parallel and Crossing Erection

In order to get the power frequency electrical field characteristics of multi-turn UHV/EHV transmission lines in parallel and crossing erection, based on the finite element method, the numerical simulation models of paralleling and crossing erections between EHV and UHV AC transmission lines were established. The influences of spacing, ground height and phase sequence on electric field performance of paralleling areas were discussed. And then the influences of cross angle, ground height and the phase sequence on electric field performance of crossing areas were also discussed. The case study verified the of the rationality of the model. The results show that the height of transmission lines has a great impact on the power frequency of electric field; With the increase of the intersection angle and the spacing of the lines, the amplitude strength of power frequency electric field is gradually reduced under the two kinds of erections; When the lines are in misalign rows, the area of high strength electric field is smaller.