用于充电桩的B型剩余电流保护器的设计

Design of B-Type Residual Current Protector for Charging Piles

对含有充电桩的充电系统漏电原理、特征和保护安装位置进行了分析,并提出用于充电桩的B型剩余电流保护器的一种设计方案,通过双磁芯及对应的拓扑结构实现剩余电流的检测。分析了不同拓扑结构对应类型的剩余电流实现脱扣的机理,对直流剩余电流的检测采用磁调制技术,对其余类型剩余电流提出不进行波形识别、直接整流的电流检测方案。根据不同拓扑结构检测的电流类型,提出上方磁芯选择磁滞回线扁平、高磁导率的材料,下方磁芯选择具有高剩磁的非晶或纳米晶材料。通过Multisim仿真软件对直流剩余电流进行检测,结果表明基于高剩磁材料的磁调制技术能够反映直流剩余电流。

The leakage principle,characteristics and protection device installation position of the charging system with charging piles are analyzed,and a design scheme of B-type residual current protector for charging pile is proposed to detect the residual current through dual magnetic core and the corresponding topology.The mechanism of realizing the trip of the residual current type corresponding to different topologies is analyzed.Magnetic modulation technology is used to detect the DC residual current.For other types of residual current,a current detection scheme of direct rectification without waveform recognition is proposed.According to the current types detected by different topological structures,is proposed a method of selecting the material with flat hysteresis loop and high permeability for the upper core,and the amorphous or nanocrystalline material with high remanence for the lower core.The DC residual current is measured by Multisim simulation software,and the results show that the magnetic modulation technology based on high remanence material can reflect DC residual current.