电力系统保护与控制2011，Vol.39Issue(16)：114-120,138,8.
基于双曲S变换的变压器励磁涌流和内部故障识别新方法
A new method of identifying inrush and internal faults of power transformer based on H-S transform
摘要
Abstract
A new method to identify inrush and internal fault of transformer based on hyperbolic S-transform (HST) is discussed. This paper uses the S transform (ST) which has excellent characteristics of time-frequency skills and time-frequency resolution and adopts the Hyperbolic window function. The signals of inrush current and fault current are transformed to phase space by using HST to extract the feature > the time-frequency contours are obtained. It is found that the time-frequency contours in case of inrush are different from that in case of internal faults. By calculating the energy after H-S transform and the ratio of energy level 1-9 and level 1 we found that ratio 6 is the threshold between inrush and fault current. The simulation result and dynamic test show that H-S transform can reflect the signal's time-frequency localization clearly, can identify inrush current, and it has strong capability in noise reduction, and is easy to separate signal from noise in ST domain.关键词
变压器差动保护/励磁涌流/内部故障/H-S变换/信噪分离Key words
transformer differential protection/ inrush current/ internal faults/ H-S transform/ signal-noise separation分类
信息技术与安全科学引用本文复制引用
焦尚彬,黄璜,赵黎明,张青..基于双曲S变换的变压器励磁涌流和内部故障识别新方法[J].电力系统保护与控制,2011,39(16):114-120,138,8.基金项目
陕西省自然科学基金资助项目(2009JQ7009) （2009JQ7009）
陕西省教育厅专项基金资助项目(2010JK750) （2010JK750）
西安理工大学科技创新计划 （）
