Improving detection sensitivity of an on-board radio interferometer system for locating partial discharge sources in propulsion coils of superconducting Maglev systems
Improving detection sensitivity of an on-board radio interferometer system for locating partial discharge sources in propulsion coils of superconducting Maglev systems
复制标题
提高机载无线电干涉仪系统的检测灵敏度，用于定位超导磁悬浮系统推进线圈中的局部放电源
DOI：
10.1109/eic.2016.7548655
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
S. Ota
中科院分区：
文献类型：
--
作者：
M. Kawada;Masao Suzuki;R. Ikeda;S. Ota
通过将天线间距从1.0 m缩短至0.5 m并引入动态谱互相关（CC），提高了超导磁悬浮系统中推进线圈异常指示的星载无线电干涉仪系统的检测灵敏度。由四个半偶极子天线组成的天线阵列接收由于异常推进线圈中发生局部放电（PD）脉冲而产生的电磁（EM）波；使用无线电干涉仪系统中嵌入的就地快速哈尔小波变换（IP-FHWT）对接收信号的动态频谱进行数字计算。结合625MHz分量的局部放电定位结果和电磁波波形的峰峰值之间的关系来指示推进线圈异常。从使用天线阵列中的两个或更多天线接收电磁波的角度来看，检测灵敏度可以提高两倍以上。通过从 CC 中仅提取 625MHz 分量，可以消除传播路径频率特性的影响，即，这可以减少时延估计和 PD 位置中的误差。
The detection sensitivity of an on-board radio interferometer system for indicating abnormal propulsion coils in superconducting magnetic levitation (Maglev) systems was improved by shortening the antenna spacing from 1.0m to 0.5m and introducing the cross-correlation (CC) of dynamic spectra. Electromagnetic (EM) waves due to the occurrence of partial discharge (PD) pulses in an abnormal propulsion coil were received with the antenna-array consisting of four half-dipole antennas; dynamic spectra of the received signals were digitally calculated by using the in-place fast Haar wavelet transform (IP-FHWT) embedded in the radio interferometer system. The abnormal propulsion coil was indicated by combining the results of the PD location using the 625MHz-component and the relationship among the peak-to-peak amplitudes of the waveforms of the EM waves. From the viewpoint of receiving the EM waves with two or more antennas of the antenna-array, the detection sensitivity could be improved more than two times. The effects of frequency characteristics of the propagation paths could be removed by extracting only the 625MHz-componet from the CCs, i.e. this could reduce both errors in the time-delay estimation and in the PD location.