Experimental Data Based Current Transformer Mathematical Simulation in Micro-Cap Program

Abstract

The present article provides detailed information on current transformer mathematical simulation using the well-known software product Micro-Cap that meets industrial standards. Basic issues of creating a mathematical model of current transformer used for measuring currents and supplying information for power metering and relay protection equipment are discussed. The described method of mathematical simulation in Micro-Cap program reflects peculiarities of a magnetic-core current transformer loaded onto various filters and relays both in quality and quantity terms and allows estimation of its operating parameters depending on the magnetic core material. The mathematical model is built using the finite element method that makes it possible to calculate the required parameters of a current transformer with the optimum output characteristics. Simulation results are used to provide recommendations for selection of output parameters of a current transformer used with relay protection devices depending on the external load value. It also contains the criteria for magnetic-core current transformer design optimization. The paper also discusses main advantages of using Micro-Cap program for simulation of primary instrument current transducers. The methods of calculating current transformer core model parameters for simulation in Micro-Cap program are described. Experimental results are compared with simulation results obtained with the mathematical model.