不同负载电流下变压器表面三维振动信号特征分析

变压器表面振动信号与绕组及铁芯运行状态密切相关。采集正常运行中变压器表面三维振动信号，结合负载电流和运行电压数据，分析总结不同方向变压器表面振动信号的时域峰值特征和频域能量特征。提出能量—电流灵敏度指标EC-S，用于定量描述变压器表面振动信号各频点能量受负载电流变化的影响，基于该指标分析了可表征变压器绕组振动状态的特征频点。结果表明同一位置不同方向的变压器表面振动信号差异显著，三维振动信号较单一方向振动信号能更全面地反映变压器绕组振动变化。

Characteristics analysis on three-dimensional surface vibration signals of transformer under different load current

Vibration signal on the surface of transformer is closely related to the running condition of winding and core. Three-dimensional vibration signals on the surface of normal running transformer are measured. Combined with the data of load current and operating voltage, the peak characteristics in time domain and the energy characteristics in frequency domain of vibration signals on the surface of transformer in different directions are analyzed and summarized. In order to quantify the energy at each frequency influenced by the change of load current, the index of energy-load current sensitivity (EC-S) is proposed, and the characteristic frequencies representing the vibration state of the winding are analyzed. The results show that the vibration signals on the surface of transformer have significant differences in different directions on the same position, and three-dimensional vibration signals are more comprehensive than single direction vibration signal in reflecting the vibration changes of the transformer winding.