定子线棒内均压结构对槽部电场强度及介质损耗因数的影响

Effects of Inner Semi-conductive Layer of Stator Bar on the Electric Field Intensity in Slot and Dielectric Loss Factor

运用计算机软件对24 kV/330 MW汽轮发电机定子线棒进行槽部电场及介质损耗因数的建模分析和仿真计算,得出采用内均压结构的定子线棒比采用原线棒能够有效降低换位处的最大场强18%,为确定内均压层对电场分布的改善效果和露铜点间距的选取提供了理论依据。在真机定子线棒上对具有内均压结构的线棒的介质损耗因数及其增量等性能进行了验证分析,确定了合理的内均压结构。

An modeling analysis and simulation on the electric field in slot and dielectric loss factor of 24 kV/330 MW turbo-generator stator bar were calculated using computer software.The results show that the maximum electric field intensity of the stator bar with inner semi-conductive layer is 18% lower than that without the layer,which provides a theoretical basis for determining the improvement effect of inner semi-conductive layer on the electric field distribution and for selecting the distance between exposed copper points.Then the dielectric loss factor and its increment of a real turbo-generator stator bar with inner semi-conductive layer were examined,and a reasonable inner semi-conductive layer was determined.