摘要
以剩余电流互感为核心原理,使用零序电流互感器、信号调理电路和电磁铁等部件设计制作了漏电保护演示仪,并利用剩余电流模拟支路实现对漏电现象的模拟展示.当电流互感器测得的漏电电流大于设定的动作阈值电流时,信号处理电路将输出高电平,驱动电磁脱扣装置工作,实现对电路的切断.演示仪的工作电压被下调至人体安全电压范围内,其阈值动作电流与模拟支路漏电电流均可调节,满足了演示实验的需求.
Based on the residual current mutual inductance as the core principle, the leakage protection demonstration instrument was designed and fabricated by using zero-sequence current transformer, signal conditioning circuit and electromagnet. The residual current simulation branch was used to simulate the leakage phenomenon. When the leakage current measured by the current transformer is greater than the set action threshold current, the signal processing circuit will output a high level to drive the electromagnetic trip device to work, thereby cutting off the circuit. The working voltage of the demonstrator is lowered to the safe voltage range of the human body, and the threshold operating current and the leakage current of the analog branch can be adjusted to meet the requirements of the demonstration experiment.
作者
戚慧珊
吴绪辉
Qi Huishan;Wu Xuhui(College of Physics and Telecommunications Engineering,South China Normal University,Guangzhou,Guangdong 510006)
出处
《物理通报》
2019年第7期87-90,共4页
Physics Bulletin
关键词
漏电保护
剩余电流
电流互感
信号处理
leakage protection
residual current
current mutual inductance
signal processing
