变压器励磁涌流新型判据及抑制技术的研究  

作　　者：张燕 郑强 刘铮 

机构地区：[1]莱芜钢铁集团自动化部,山东莱芜271104 [2]莱芜钢铁集团板带厂,山东莱芜271104

出　　处：《科技与企业》2010年第6期86-88,共3页Science-Technology Enterprise

摘　　要：当电力变压器空载合闸时,瞬时可能会产生一个极大的励磁涌流,其大小甚至会达到10倍的额定电流。励磁涌流不仅会影响电能质量,还可能对系统中反应灵敏的电子设备造成损害。本文在分析了励磁涌流特征的基础上,提取变压器磁通中的直流分量以及变压器两侧瞬时有功功率,提出一种新的励磁涌流判据方法,以期在励磁涌流出现后对其进行准确的识别,并通过反极性补偿变压器中性点接地处的电位对励磁涌流进行快速的抑制。A power transformer, when energized at noload, may have transient currents up to 10 times that of the steady state current. This inrush current has several detrimental effects on power quality and may damage sensitive equipment connected to the system. In this paper, a new method to distinguish magnetizing inrush current and internal fault by DC component of flux and instantaneous active power of both sides has been put forward, and when the inrush current appears, rapidly inhibited it based by electric potential compensation of reverse polarity.

关 键 词：励磁涌流 磁通的直流分量 差瞬时有功功率 电位补偿 

分 类 号：TM41[电气工程—电器]