Improved wavelet analysis in enhancing Electromagnetic Campatibility of underground monitoring system in coal mine

孙继平; 马凤英; 吴东旭; 刘晓阳

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Improved wavelet analysis in enhancing Electromagnetic Campatibility of underground monitoring system in coal mine

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Underground Electro Magnetic Interference (EMI) has become so serious that there were false alarms in monitoring system,which induced troubles of coal mine safety in production.In order to overcome difficulties caused by the explosion-proof enclosure of the equipments and the limitation of multiple startup and stop in transient process during EMI measurement,a novel technique was proposed to measure underground EMI distri- bution indirectly and enhance Electromagnetic Campatibility(EMC) of the monitoring sys- tem.The wavelet time-frequency analysis was introduced to underground monitoring sys- tem.Therefore,the sources,the startup time,duration and waveform of EMI could be as- certained correctly based on running records of underground electric equipments.The electrical fast transient/burst (EFT/B) was studied to verify the validity of wavelet analysis. EMI filter was improved in accordance of the EMI distribution gotten from wavelet analysis. Power port immunity was developed obviously.In addition,the method of setting wavelet thresholds was amended based upon conventional thresholds in the wavelet filter design. Therefore the EFT/B of data port was restrained markedly with the wavelet filtering.Coor- dinative effect of EMI power and wavelet filter makes false alarms of monitoring system reduce evidently.It is concluded that wavelet analysis and the improved EMI filter have enhanced the EMC of monitoring system obviously.

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来源
《国际煤炭科学技术学报：英文版》 |2008年第2期|311-316|共6页
作者
孙继平; 马凤英; 吴东旭; 刘晓阳;
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作者单位

State Key Laboratory of Coal Resources and Safe Mining;

China University of Mining and Technology (Beijing);

Beijing 100083;

China;

College of Electronic Information and Control Engineering;

Shandong Institute of Light Industry;

Jinan 250100;

China;

School of Safety Science and Technology;

Liaoning Technical University;

Fuxin 123000;

China;

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原文格式 PDF
正文语种 chi
中图分类矿山开采;
关键词
子波分析; 监视系统; 煤矿; 开采工作;

机译：小波分析;电磁兼容性;监测系统;EFT / B;免疫;

Improved wavelet analysis in enhancing Electromagnetic Campatibility of underground monitoring system in coal mine

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