CAJ | 학술논문

高压变电站内工频电场的计算与评测日益重要。为此，采用3D模拟电荷法（charge simulation method，CSM）对某变电站户外区域离地1．5m高度处工频电场进行了计算和分析。模拟电荷采用置于导体轴线上的线电荷模拟，电荷密度在线单元上呈线性分布。采用ANSYS前、后处理模块实现实体建模和计算云图的3D渲染；通过对一条1000kV特高压输电线路走廊内工频电场的计算，验证了3DCSM方法的正确性。对一个实际的110kV变电站的工频电场进行建模仿真，电场强度的数值分布规律同理论分析基本符合；在工作走廊上计算值同实测结果变化趋势一致，在电气设备不太密集的区域，计算值与实测值之间误差〈10％。该方法可以用来求解大模型开域场问题。
고압변전참내공빈전장적계산여평측일익중요。위차，채용3D모의전하법（charge simulation method，CSM）대모변전참호외구역리지1．5m고도처공빈전장진행료계산화분석。모의전하채용치우도체축선상적선전하모의，전하밀도재선단원상정선성분포。채용ANSYS전、후처리모괴실현실체건모화계산운도적3D선염；통과대일조1000kV특고압수전선로주랑내공빈전장적계산，험증료3DCSM방법적정학성。대일개실제적110kV변전참적공빈전장진행건모방진，전장강도적수치분포규률동이론분석기본부합；재공작주랑상계산치동실측결과변화추세일치，재전기설비불태밀집적구역，계산치여실측치지간오차〈10％。해방법가이용래구해대모형개역장문제。
Calculation and assessment of power frequency electric field in the high voltage substation is very important for the substation designers. 3D charge simulation method （CSM）is applied to calculate the power frequency electric field in outdoor area of a typical substation, in which the overhead line, overhead bus, transformer, house and grounded metal pillar are modeled. In 3D CSM, some linear charge elements, which change linearly along the line element are treated as the simulating charges and placed in each conductor＇s center. Then the global potential coefficient matrix is obtained by the superposition of each element＇s contribution. The linear charge on each node is solved and the electric field on arbitrary points can be analytically calculated. Moreover, the 3D model is built and the calculation results are shown by pre-process module and post-process module of ANSYS software, and the proposed method is primarily proved by an example of 1000 kV overhead line to analyze the electric field in the plane 1. 5 m area above the ground. Based on the 3D CSM, a practical 110 kV substation is modeled to calculate and analyze power frequency electrical field. The calculation results of electrical field intensity in working corridor agree well with measurement values. The relative error between calculation and measurement values is lower than 10 percent at the area with lower concentration equipment. The proposed method can be used to solve open boundary electrical field problem with complex model.