摘要
介绍了一种全新思路的电流传感器——振膜式电流传感器(FVCT)。FVCT的工作原理是基于永磁体的磁场力对电流的作用。实现方法是用一片置入电流线圈的薄膜,电流线圈分流了主导线电流,永磁体磁场力对电流的作用使薄膜振动(交流)或进动(直流),其幅值是电流的线性函数。从低电位经光纤向高电位发射普通光束,经薄膜反射后再传回低电位,反射光的强度随薄膜的振动或进动发生变化,通过测量光强的变化得到需要测量的电流。同时,传输光纤实现了高电位与低电位之间的电气隔离。FVCT高电位无源,既可以用于交流电流的测量,也可以用于直流电流的测量,不受电压等级的限制,能真实地反映谐波和故障暂态非周期分量。原理样机初步实现了0.5级测量准确度。
A new type of current transducer, film vibration current transducer （FVCT） is presented. The FVCT is based on Newton force of permanent magnet to act on current. A shunt coil is connected to main line and embedded in a piece of high polymer film so that the Newton force will act on current flowing in the coil and therefore drive the film to vibrate. The magnitude of vibration is a linear function of current. A non-contact vibration sensor is employed to sense the vibration in which two groups of optical fibers bundled together to transmit light with one group to the film from ground to high potential and receive light reflected and transmit it to ground as well with the other. The intensity of reflective light is modulated by current and converted to electric signal on ground. Meanwhile high potential in the FVCT is isolated to ground completely by the optical fibers. The FVCT has no power supply required in high potential, better than 0.5 % accuracy, no transient response delay, capable of both AC and DC current sensing and no limit of how high of potential to be in use. A prototype has been built up for a purpose of FVCT＇s principle verification and 0.5 % accuracy achieved.
出处
《电力系统自动化》
EI
CSCD
北大核心
2009年第8期81-83,共3页
Automation of Electric Power Systems
关键词
电流传感器
电流互感器
振膜式
current transducer
current transformer
film vibration mode
