应用于变电站接地网的空间磁场检测装置
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摘要
变电站接地网发生短路故障时,导体上的电流以及土壤中的泄漏电流会产生较强的空间磁场,可能影响站内设备的正常工作进而危害变电站的安全运行,现有的方法无法检测土壤中的泄漏电流对空间磁场的影响。对此本文设计了一款以超薄的液晶聚合物LCP为介质基板的柔性宽带天线,用于准确检测变电站接地网的空间磁场,该天线的基本辐射单元为宽带单极子天线,采用了微带馈电的馈电方式。经软件仿真结果表明,该天线覆盖在0.5KHz-22KHz工作频段,已经满足了宽带天线的要求。
When a short circuit fault occurs in the substation grounding grid,the current on the conductor and the leakage current in the soil will generate a strong spatial magnetic field,which may affect the normal operation of the equipment in the station and endanger the safe operation of the substation. The existing method cannot detect the leakage in the soil. The effect of current on the magnetic field. In this paper,a flexible broadband antenna with ultra-thin liquid crystal polymer LCP as the dielectric substrate is designed to accurately detect the spatial magnetic field of the substation grounding grid. The basic radiating element of the antenna is a broadband monopole antenna,which adopts micro Feeding mode with feed. The software simulation results show that the antenna covers the working frequency range of 0.5 KHz-22 KHz,which has met the requirements of broadband antenna.
When a short circuit fault occurs in the substation grounding grid,the current on the conductor and the leakage current in the soil will generate a strong spatial magnetic field,which may affect the normal operation of the equipment in the station and endanger the safe operation of the substation. The existing method cannot detect the leakage in the soil. The effect of current on the magnetic field. In this paper,a flexible broadband antenna with ultra-thin liquid crystal polymer LCP as the dielectric substrate is designed to accurately detect the spatial magnetic field of the substation grounding grid. The basic radiating element of the antenna is a broadband monopole antenna,which adopts micro Feeding mode with feed. The software simulation results show that the antenna covers the working frequency range of 0.5 KHz-22 KHz,which has met the requirements of broadband antenna.
引文
[1] Xiong W,Dawalibi F.Transient performance of substation grounding system subjected to lightning and similar surge currents[J]. IEEE Trans on Power Delivery,1994,9(3):1421-1427.
[2]Dawalibi F,Xiong W,Ma J.Transient performance of substation structures and associated grounding systems[J]. IEEE Trans on Industry Applications,1995,31(5):520-527.
[3]张波,崔翔,赵志斌.计及两端接地电缆影响的接地网数值分析方法[J].中国电机工程学报,2005,25(13):144-148.ZHANG Bo,CUI Xiang,ZHAO Zhi-bin. Numerical analysis of the grounding grid with two-end grounded cables[J]. Proceedings of the CSEE,2005,25(13):144-148.
[4]何金良,曾嵘.电力系统接地技术[M].北京:科学出版社,2007.
[5]陈一林.具有滤波特性的超宽带天线设计方法与研究[J].南京航空航天大学,2010.
[6]王扬智.宽频带微带天线的研宛及设计实现[D].西北工业大学,2007.
[7]张文梅,陈雪,韩国瑞,等.平面超宽带天线的设计与研究[J].电波科学学报,2008,23(2):335-339.
[8]LAU B K,ANDERSEN J B.Simple and efficient decoupling of compact arrays with parasitic scatterers[J].IEEE Transactions on Antennas and Propagation,2012,60(2):464-472.
[9]MAK A C K,ROWELL C R,MURCH R D.Isolation enhancement between two closely packed antennas[J]. IEEE Transactions on Antennas and Propagation,2008,56(11):3411-3419.
[2]Dawalibi F,Xiong W,Ma J.Transient performance of substation structures and associated grounding systems[J]. IEEE Trans on Industry Applications,1995,31(5):520-527.
[3]张波,崔翔,赵志斌.计及两端接地电缆影响的接地网数值分析方法[J].中国电机工程学报,2005,25(13):144-148.ZHANG Bo,CUI Xiang,ZHAO Zhi-bin. Numerical analysis of the grounding grid with two-end grounded cables[J]. Proceedings of the CSEE,2005,25(13):144-148.
[4]何金良,曾嵘.电力系统接地技术[M].北京:科学出版社,2007.
[5]陈一林.具有滤波特性的超宽带天线设计方法与研究[J].南京航空航天大学,2010.
[6]王扬智.宽频带微带天线的研宛及设计实现[D].西北工业大学,2007.
[7]张文梅,陈雪,韩国瑞,等.平面超宽带天线的设计与研究[J].电波科学学报,2008,23(2):335-339.
[8]LAU B K,ANDERSEN J B.Simple and efficient decoupling of compact arrays with parasitic scatterers[J].IEEE Transactions on Antennas and Propagation,2012,60(2):464-472.
[9]MAK A C K,ROWELL C R,MURCH R D.Isolation enhancement between two closely packed antennas[J]. IEEE Transactions on Antennas and Propagation,2008,56(11):3411-3419.