PCB空心线圈电流传感器的暂态特性  

Transient Behavior of PCB Air-Core Coil Current Transformer

作　　者：张冈[1] 王程远[1] 陈幼平[1] 

机构地区：[1]华中科技大学机械学院,武汉430074

出　　处：《电工技术学报》2010年第11期85-89,共5页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(60204004);湖北省自然科学基金(2005ABB007)资助项目

摘　　要：在电流测量中,PCB空心线圈具有很好的测量准确度和参数一致性。在模拟积分器中,T形积分器具有很好的低频噪声抑制能力。为此,提出了一种基于PCB空心线圈和T形积分器的电子式电流传感器,建立了该传感器的传递函数模型和短路电流全偏移时的暂态特性模型。重点分析了其对电力系统暂态电流的测量性能,对影响暂态特性的参数进行了数学分析,这为传感器的动态性能优化设计提供了一种分析方法。对传感器样机进行了动模试验,和分流器的输出信号相比,两者波形吻合较好,峰值瞬时误差在±1%左右。该试验结果表明,PCB空心线圈电流传感器具备准确反应电力系统故障电流暂态过程的能力,满足电力系统对电流测量和保护的需求。Printed circuit board（PCB） air-core coil has advantages of high accuracy and parameters consistency in the current measurment.T-integrator has a good suppress ability to low-frequency noise among various analog integrators.Therefore,a kind of electronic current transformer based on PCB air-core coil and T-integrator is presented,and its transfer function and transient mathematical models are deduced.The transient current measurement behaviors of this current transformer are analyzed especially.Simulation results confirm the validity of the proposed models,which can give some instructions to improve the transient behaviors of current transformer.Compared with the resistance type current sensor,the transient peak error is about ±1%,and the match extent of two output waveforms is good.The dynamic simulation experiments show that PCB air-core coil current transformer has the pleased ability to accurately respond the fault current transient process in the power system,and can meet the demand of power system for current measurement and protection.

关 键 词：PCB空心线圈 T形积分器 电子式电流传感器 暂态特性 

分 类 号：TM452[电气工程—电器]