基于Hilbert-Huang变换的电力变压器铁心压紧力监测方法

陈祥献;王婧頔;黄 海;郭 洁;洪凯星

振动与冲击 ›› 2010, Vol. 29 ›› Issue (9) : 9-12,6.

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振动与冲击 ›› 2010, Vol. 29 ›› Issue (9) : 9-12,6.
论文

基于Hilbert-Huang变换的电力变压器铁心压紧力监测方法

  • 陈祥献1;王婧頔1;黄 海1;郭 洁1;洪凯星2
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A HHT Based Method for Monitoring Core Clamping Pressure of Power Transformers

  • CHEN Xiang-xian1;WANG Jing-di1;HUANG Hai1;GUO Jie1;Hong Kai-xing2
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摘要



摘 要 利用Hilbert-Huang变换对信号的自适应特性,提出一种基于振动法的电力变压器铁心压紧力在线监测方法。通过对铁心振动信号进行经验模式分解(EEMD),得到一组特征模式函数(IMFs),根据铁心振动特性确定出反映压紧力变化的IMFs,计算IMFs的瞬时频率和时频能量分布,用瞬时频率和时频能量分布构建能够表述铁心压紧力的特征矢量,经距离算法计算特征矢量的长度值,实现铁心压紧力变化的在线监测。实验结果表明,由Hilbert-Huang变换得到的铁心振动时频能量分布具有明确的物理意义,提出的特征矢量和距离算法能够有效反映铁心在不同压紧力状况下的振动特性,为电力变压器的振动在线状态监测与故障诊断奠定了良好的基础。







Abstract

Abstract:Employing the adaptive Hilbert-Huang Transform (HHT) technique, a novel vibration based method for monitoring core clamping pressure of power transformers was proposed. Core vibration signals were decomposed into a set of intrinsic mode functions (IMFs) by means of ensemble empirical mode decomposition (EEMD). The IMFs representing the changes of core clamping pressure were identified according to the core vibration behavior,and their instantaneous frequencies and time-frequency-energy distribution were obtained by using HHT. With the instantaneous frequencies and time-frequency-energy distribution, a feature vector was constructed and its value obtained by a distance algorithm was used to quantify the clamping pressure. The experimental results show that the derived energy-frequency-time distribution of the core vibration has clear physical meaning and the proposed feature vector and distance algorithm can characterize the core vibration under different clamping pressure condition. The method is effective for vibration condition monitoring and diagnosis of power transformers.

关键词

关键字: 铁心振动 / 压紧力 / EEMD / 电力变压器

Key words

Core vibration / Clamping pressure / EEMD / Power transformers

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陈祥献;王婧頔;黄 海;郭 洁;洪凯星. 基于Hilbert-Huang变换的电力变压器铁心压紧力监测方法[J]. 振动与冲击, 2010, 29(9): 9-12,6
CHEN Xiang-xian;WANG Jing-di;HUANG Hai;GUO Jie;Hong Kai-xing. A HHT Based Method for Monitoring Core Clamping Pressure of Power Transformers[J]. Journal of Vibration and Shock, 2010, 29(9): 9-12,6

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