大型汽轮发电机主绝缘的频域介电响应研究  

Study on the Frequency Domain Dielectric Spectroscopy of Large Turbogenerators

作　　者：张征平 郝长金 涂小涛 高波[2] 胡卫 陈宇[2] ZHANG Zhengping HAO Changjin TU Xiaotao GAO Bo HU Wei CHEN Yu(Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510080, China College of Electrical Engineering, Southwest Jiaotong University,Chengdu 610031, China)

机构地区：[1]广东电网有限责任公司电力科学研究院,广州510600 [2]西南交通大学电气工程学院,成都610031

出　　处：《大电机技术》2017年第3期27-31,共5页Large Electric Machine and Hydraulic Turbine

摘　　要：为研究将频域介电谱法(frequency domain dielectric spectroscopy,FDS)用于发电机绝缘状态无损诊断的可行性,对发电机线棒试品进行多因子加速老化,采用FDS法测量了不同老化程度下发电机定子线棒的介质损耗因数tanδ和相对介电常数ε,建立与常规试验参量介质损耗角正切tanδ和电容C之间的量化关系。结果表明,线棒试品的老化程度对频域谱曲线影响显著,随着老化的进行,tanδ和ε的值增大,低频下增大趋势更加明显,tanδ频谱曲线的损耗峰向高频方向移动;不同老化程度的线棒试品在特征频率处的tanδ与电容C、特征频率处的ε和工频下tanδ满足指数函数关系,研究成果表明FDS技术可用于发电机老化状态的无损诊断。To research the feasibility of applying frequency domain dielectric spectroscopy method to diagnosis of generator insulation condition, dielectric dissipation factor tanδ and relative dielectric constant of test specimens of generator stator bar of different aging degrees under multi-factor accelerated aging are tested by FDS method. And the quantitative relationship between capacitance and routine test parameters of dielectric loss tangent tanδ are built. The result shows that the frequency domain spectral curve are affected by the aging degree of test bar significantly. The values of tanδ and ε increase with the aging degree, especially in low frequency stage. Tanδ at characteristic frequencies with capacitance C and e at characteristic frequencies with tand under power frequency of different aging periods meet the index function relation.The research results are available for reference to apply FDS tononinvasive diagnosis of generator insulation aging status.

关 键 词：汽轮发电机 频域介电谱 多因子老化 相对介电常数 介麵耗因数 

分 类 号：TM311[电气工程—电机]