为了早期发现电力变压器的振动故障问题,需要选择有效位置对变压器的振动状态进行检测。针对电力变压器铁芯—绕组振动特性,通过有限元分析,仿真得到铁芯—绕组测点位置。以型号为S13—12500/35型油浸式无励磁调压35 k V电力变压器为试...为了早期发现电力变压器的振动故障问题,需要选择有效位置对变压器的振动状态进行检测。针对电力变压器铁芯—绕组振动特性,通过有限元分析,仿真得到铁芯—绕组测点位置。以型号为S13—12500/35型油浸式无励磁调压35 k V电力变压器为试验对象,将光纤Bragg光栅(FBG)振动传感器安装于铁芯—绕组的测点位置,对不同负载下变压器振动信号进行检测与频谱分析,结果表明:变压器振动信号频率集中在100 Hz及其倍频处;在80%,90%,100%负载下,幅频信号100 Hz处的振动幅值随着变压器负载的增大而增大。展开更多
The optical wavelet filter is designed. It can filter and choose frequency swiftly. It can realize demodulation of distributed fiber Bragg grating（FBG） measurement system. Its scanning resolution and scanning period...The optical wavelet filter is designed. It can filter and choose frequency swiftly. It can realize demodulation of distributed fiber Bragg grating（FBG） measurement system. Its scanning resolution and scanning period depend on wavelet function. Wavelet function is controlled by computer. Compared to conventional scan filter, optical wavelet filtering has some advantages such as simple structure, high scan frequency, high resolution and good linearity. At last, the error of optical wavelet filter scanning procedure is analyzed. Scanning step length refers to the shifting of optical wavelet window＇s central frequency. It affects system precision directly. If scanning step length is different, the measured signal is different. The methods of reducing step length guarantee scanning periodic time are presented.展开更多
文摘为了早期发现电力变压器的振动故障问题,需要选择有效位置对变压器的振动状态进行检测。针对电力变压器铁芯—绕组振动特性,通过有限元分析,仿真得到铁芯—绕组测点位置。以型号为S13—12500/35型油浸式无励磁调压35 k V电力变压器为试验对象,将光纤Bragg光栅(FBG)振动传感器安装于铁芯—绕组的测点位置,对不同负载下变压器振动信号进行检测与频谱分析,结果表明:变压器振动信号频率集中在100 Hz及其倍频处;在80%,90%,100%负载下,幅频信号100 Hz处的振动幅值随着变压器负载的增大而增大。
基金This project is supported by National Natural Science Foundation of China(No.60377002).
文摘The optical wavelet filter is designed. It can filter and choose frequency swiftly. It can realize demodulation of distributed fiber Bragg grating（FBG） measurement system. Its scanning resolution and scanning period depend on wavelet function. Wavelet function is controlled by computer. Compared to conventional scan filter, optical wavelet filtering has some advantages such as simple structure, high scan frequency, high resolution and good linearity. At last, the error of optical wavelet filter scanning procedure is analyzed. Scanning step length refers to the shifting of optical wavelet window＇s central frequency. It affects system precision directly. If scanning step length is different, the measured signal is different. The methods of reducing step length guarantee scanning periodic time are presented.
