油浸式电力变压器绕组与铁心振动特性研究

Research on Vibration Characteristics of Windings and Core of Oil-Filled Transformer

利用变压器振动测试系统,对在变压器油箱表面测得的铁心及绕组的振动信号进行研究.在理论研究影响铁心及绕组振动各因素的基础上,实验验证了在空载状态下油箱表面测得的,铁心振动信号的基频幅值与施加电压的平方以及绕组振动信号的基频幅值与流过绕组的负载电流平方都呈较好的线性关系.指出了铁心振动信号中含有高次谐波含量,且与施加电压的平方不存在线性关系,而绕组振动信号主要集中在100Hz处.提出了电网电压波动较大时必须考虑空载电压大小对铁心振动的影响,评价绕组的振动水平时必须考虑负载电流的大小.研究内容对于振动信号分析法的推广应用具有重要意义.

The vibration signals of core and winding measured from the transformer oil tank with vibration measurement system are investigated. Based on the theoretical analysis of each factor inducing vibration of core and winding, the experiments validated that the fundamental frequency magnitudes of core and winding vibrations are linear to square of no-load voltage and loading current respectively. It is found that high order harmonic contents exist in the core vibration signals and these are not linear to square of no-load voltage. The winding vibrates dominantly at 100 Hz. It is pointed out that the influence of no-load voltage on core vibration and the influence of loading current on winding vibration ought to be considered, especially, for the situation of remarkably undulatory net-voltage.