Parameter Calculation and Working Characteristic Analysis of a New Type of Magnetic Integrated CRT

Abstract

The working characteristic of an electromagnetic equipment is an important reference standard for measuring its working performance. In this paper, we take a new type of magnetic integrated controllable reactor of transformer type (CRT) as the research object, establish its equivalent mathematical model and deduce its calculation short-circuit impedance and winding current formulas. On this basis, the relationship between the working winding instantaneous current, harmonic current coefficient and equivalent impedance of the new magnetic integrated CRT and the thyristor trigger angle is quantitatively analysed, and the working characteristic curves, such as the instantaneous current waveform, harmonic characteristic curve, control characteristic curve and volt-ampere characteristic curve of the working winding, are obtained. On the basis of the MATLAB/Simulink simulation platform, a new magnetic integrated CRT simulation model is established to simulate the working winding current under different trigger angles to verify the established formulas. Mean-while, the response speed of the CRT is simulated and analysed. Results show that the analytical calculation results of the winding cur-rent of the magnetic integrated CRT are consistent with the simulation results. The new type of magnetic integrated CRT has the characteristics of hierarchical smooth regulation and low harmonic current and the ad-vantages of fast response speed and high sensitivity. Furthermore, the CRT’s volt-ampere characteristic is approximately linear. This study is expected to provide some theoretical guidance for the in-depth understanding of the working characteristics of the magnetic integrated CRT and the structural design and optimisation of the CRT.