【摘要】 电流互感器是电力系统中的重要设备,对电力系统的正常运行和精确计量起着十分重要的作用。随着国民经济的发展,各种供电电压等级不断出现,对电力系统的测量和保护准确度要求不断提高。Rogowski线圈主要用在测量交流大电流、脉冲电流、电力系统中的暂态电流等方面,它具有输出功率低、结构简单、线性度良好等特点。分析了3种不同截面形状(矩形、圆形和跑道形)的Rogowski线圈,针对不同截面形状的线圈建立了不同的数学模型,研究了Rogowski线圈结构参数(如线圈宽度、厚度和中心半径)和电磁参数(如线圈自感、互感和内阻)之间的关系。通过MATLAB软件对Rogowski线圈进行的仿真研究证明:从结构上来看,圆形截面的Rogowski线圈最优,跑道形次之,矩形最差。更多还原

【Abstract】 Current transformers(TAs) are important components in power system.And they play a primary role for working well and calculating precisely in power system.With the development of national economy,all kinds of new voltage levels and current levels emerge continuously,the high precise of measurement and protection are demanded increasingly.When traditional electromagnetic type TAs are used for measurement and protection,the problems of their magnetic path saturation always disturb people.With the development of the computerized and digital technology of measurement and protections devices,the devices don’t match with TAs of big output power.Thus electronic current transformers (ECA) based on Rogowski coil with the advantages of small output power,simple construction and ideal linearity attract people’s attention and come into extensive research.Rogowski coils are increasingly used to measure high voltage AC current,pulse current and transient current in power industry.Rogowski coils have the advantages of small output power,simple construction and ideal linearity.There are three different cross sections of Rogowski coils,that are Rogowski coils with rectangular cross section,with circular cross section and with cross section in racetrack shape.Three typical mathematical models of Rogowski coils are introduced in this paper.The relations between dimensions(width,thickness and central radii of Rogowski coils) and electromagnetic parameters(inductance, mutual inductance and resistance of Rogowski coils,) of the Rogowski coil have been studied.Furthermore,the graph between dimensions and electromagnetic parameters is gained.By means of software MATLAB,it is verified by theory that Rogowski coil with circular cross section is the best in three different configuration and Rogowski coil with cross section in racetrack shape is better than Rogowski coil with rectangular cross section.更多还原