电测与仪表Issue(16)：21-24,60,5.
利用小波包能量区分变压器内外部故障
Distinguish between transformer internal and external fault based on wavelet packet energy
摘要
Abstract
TA saturation is one of the key issues to be solved in transformer differential protection.Deep analysis and simulation study of transformer TA saturation showed that when TA saturates, external fault currents contain a great amount of point mutations, while the internal fault current is continuous.According to the conclusion, we propose a new method for distinguishing transformer internal and external fault based on wavelet packet transform.Firstly, wave-let packet transform respectively decomposes internal and external fault current with TA saturation, then calculates en-ergy of decomposed signals.The difference among signals is quantified and can be observed visually, and finally puts forward the criterion.Simulation results show that the method can distinguish internal and external fault current under the condition of TA saturation and timely prevent possible damage, as well as can avoid transformer differential protec-tion mal-operation.关键词
TA饱和/小波包能量/差动保护/变压器/误动作Key words
TA saturation/wavelet packet energy/differential protection/transformer/mal-operation分类
信息技术与安全科学引用本文复制引用
李美蓉,公茂法,公政,张培杰,沈艳涛..利用小波包能量区分变压器内外部故障[J].电测与仪表,2015,(16):21-24,60,5.基金项目
国家级大学生创新创业训练计划资助项目（201210424046）；山东省自然科学基金（ZR2012EEM021）；山东科技大学研究生科技创新基金 （）
