电晕笼中分裂导线交流电晕损失计算分析

Calculation and Analysis of Bundle Conductors 'AC Corona Loss in Corona Cage

电晕损失是导线电晕特性研究的重要内容之一,但针对交流导线电晕损失的计算模型的研究较少,为此在建立电晕笼内导线电晕损失计算模型中应用了模拟电荷法,采用线电荷模拟交流导线,对正方型截面笼壁分别作镜像处理;计算导线表面电场强度不均匀性对电晕放电的影响时考虑了空间电荷的因素;导线模拟电荷量超过起晕电荷量条件下分别计算导线上每个模拟电荷点向空间发射的电荷量。仿真模拟了电荷发射、迁移、复合过程并计算了迁移过程中电荷运动产生的能量损失。同时开展8m×8m方型截面特高压电晕笼8分裂导线电晕损失测量试验,在200～600kV试验电压范围内,特高压电晕笼分裂导线8×LGJ-500/35电晕损失为0～680W/m。仿真计算与试验数据对比,两者结果基本一致。研究结果表明:采用模拟电荷法建立的电晕笼内分裂导线电晕损失计算模型,可以计算得出电晕笼内考虑空间电荷的交流合成电场,能够反映导线电晕损失的基本物理过程,可以较好的仿真计算电晕笼分裂导线电晕损失。

In order to establish a calculation model of conductor corona loss in corona cage,AC conductor was simulated by line charges,and charges were mirrored by square section cage walls.Considering the impact of space charges,the effect of conductor surface electric field strength in-homogeneity on corona charge was calculated.Meanwhile,emission,migration,and recombination of charges were simulated,and energy loss of charge movement was calculated.Moreover,corona loss of bundle conductors was measured in the 8 m×8 m square cross section UHV cage,the test voltage was 200~600 kV,and corona loss of bundle conductors 8×LGJ-500/35 was 0~680 W/m.According to experience,the roughness parameter was 0.85,and the corona loss was calculated.The research results show that,charge simulation method can be adopted to establish corona loss calculation model of single conductor,bundle conductors,and the corona loss calculation model can compute the AC composite electric field strength including space charge,reflect the fundamental physics process of conductor corona loss,and simulate and calculate corona cage bundle conductors corona loss.