风电场35kV箱变油色谱数据异常的分析

Abnormal Chromatographic Data Analysis of Box Transformer Oil in a 35 kV Wind Farm

通过对风力发电场35kV箱变的缺陷分析,以及一系列相关试验、吊芯检查和分析,论述了该箱变高压绕组设计结构是导致高压绕组层间电压过高,每层绕组端部电场过分集中以及负载损耗的附加损耗过高,从而进一步引起高压端漆包线发生严重的局部放电和低温过热的原因.分析表明:如果H2含量及总烃超标,并且总烃中甲烷气体含量很高,乙烯和乙炔含量很低,可以初步判断为设备内部存在低能量的局部放电故障.最后针对这批箱变的通病提出了整改措施.

This paper analyzes the defection of 35 kV box transformer,a series of related experiments,and hanging core inspection.Then,this paper discusses the reason because of the design structure of the high voltage winding of the box transformer that leads to over voltage between the high voltage winding layers,and electric field of each layer winding end is over-concentration,and the additional loss of load loss is too high,and thus lead to further the enameled wire of high voltage terminal happens partial discharge seriously and cryogenic overheating.And this paper also demonstrates that it can initially determine that low-energy partial discharge fault is inside the device if the hydrogen content is overweight seriously,total hydrocarbons is overweight,and methane gas content of total hydrocarbons is very high,ethylene and acetylene is very low.Finally,it proposes some corrective measures for the common problem of this box transformer.