基于振动的电力变压器铁心松动故障诊断研究

发布时间：2018-04-23 07:55

本文选题：振动法 + 电力变压器　；参考：《高压电器》2015年12期

【摘要】：电力变压器发生铁心松动故障后,虽然振动信号中基频分量(100 Hz)会发生变化,但影响振动基频信号的因素众多,很难据此准确诊断铁心松动故障。研究发现,变压器铁心松动后,50 Hz分量及其部分倍频分量、基频的倍频分量等新特征频率能够反映故障。根据特征频率之间的关系提出基于振动的变压器铁心故障诊断方法,不仅能够诊断出变压器铁心内部有无故障,还能判断其故障类型。为了验证提出的模型和方法,文中对实际变压器设置铁心松动故障,采集其监测点处的振动信号,经过消噪、折算处理,采用提出的诊断方法对实际变压器进行故障诊断,其诊断结果与实际故障一致,验证了提出的诊断方法准确、可行。根据所提出的诊断方法研制出基于振动的电力变压器故障诊断系统,并应用于实际变电站。
[Abstract]:Although the fundamental frequency component (100 Hz) of the vibration signal will change after the core loosening fault occurs in the power transformer, there are many factors affecting the vibration fundamental frequency signal, so it is difficult to diagnose the core loosening fault accurately. It is found that the new characteristic frequencies, such as 50 Hz component and partial frequency doubling component of transformer core and frequency doubling component of fundamental frequency, can reflect the fault. According to the relationship between characteristic frequencies, a method of transformer core fault diagnosis based on vibration is proposed, which can not only diagnose the inner fault of transformer core, but also judge the type of fault. In order to verify the proposed model and method, this paper sets the core loosening fault for the actual transformer, collects the vibration signal of its monitoring point, after noise elimination, conversion processing, and uses the proposed diagnosis method to diagnose the actual transformer fault. The diagnosis result is consistent with the actual fault, which verifies the accuracy and feasibility of the proposed diagnosis method. A power transformer fault diagnosis system based on vibration is developed according to the proposed diagnosis method and applied to practical substation.
【作者单位】：江苏省电力公司南京供电公司;河海大学能源与电气学院;西安博能电力技术有限公司;
【基金】：国家电网公司重点科技项目(2011-0810-2251) 国家自然科学基金资助项目(51177039)~~
【分类号】：TM41

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