发电机定子线棒槽放电的影响因素研究  

Research on Influencing Factors of Generator Stator Bar Slot Discharge

作　　者：王振羽 WANG Zhenyu(State Grid Xinyuan Fengman Dam Reconstruction and Project Construction Bureau,Jilin 131200,China)

机构地区：[1]国网新源丰满大坝重建工程建设局,吉林吉林131200

出　　处：《大电机技术》2021年第2期54-58,共5页Large Electric Machine and Hydraulic Turbine

摘　　要：发电机定子线棒槽放电是影响发电机稳定运行的重要因素。本文在传统模型基础上,建立了发电机槽放电的有限元计算模型,并通过击穿电压与气隙高度的非线性关系,对槽放电的材料和结构方面的影响因素进行了系统分析。通过模型计算,得到了在低阻磨损和未磨损情况下,槽内气隙电位差分布状态和关键参数对气隙放电的影响。结果表明:低阻磨损长度大于4mm时,易引起槽放电;低阻的阻值大于107Ω时,存在较大风险的槽放电。该模型对于指导线棒低阻防晕和槽内固定结构设计具有一定的参考价值。The slot discharge of the stator bar of the generator is an important factor affecting the stable operation of the generator.In this paper,based on the traditional model,the finite element calculation model of the generator slot discharge is established,and the influencing factors of the material and structure of the slot discharge are systematically analyzed through the nonlinear relationship between the breakdown voltage and the air gap height.By model calculations,the effects of the distribution state of the air gap voltage difference and the key parameters on the air gap discharge in the case of low resistance wear and non-wear are obtained.The results show that the low resistance wear length greater than 4 mm is sufficient to cause slot discharge.When the resistance is greater than 107Ω,there is a great risk of slot discharge.This model has certain reference value for guiding the design of low-resistance anti-corona and fixed structure in the slot.

关 键 词：定子线棒 槽放电 击穿电压 有限元方法 

分 类 号：TM303.4[电气工程—电机]