Improved modeling of new three-phase high voltage transformer with magnetic shunts

Abstract

This original paper deals with a new approach for the study of behavior in nonlinear regime of a new three-phase high voltage power supply for magnetrons, used for the microwave generators in industrial applications. The design of this system is composed of a new three-phase leakage flux transformer supplying by phase a cell, composed of a capacitor and a diode, which multiplies the voltage and stabilizes the current. Each cell. in turn, supplies a single magnetron. An equivalent model of this transformer is developed taking into account the saturation phenomenon and the stabilization process of each magnetron. Each inductance of the model is characterized by a non linear relation between flux and current. This model was tested by EMTP software near the nominal state. The theoretical results were compared to experimental measurements with a good agreement. Relative to the current device, the new systemprovides gains of size, volume, cost of implementation and maintenance which make it more economical.

Inrush Current Reduction Strategy for a Three-Phase Dy Transformer Based on Pre-Magnetization of the Columns and Controlled Switching

“…There are numerous mitigation techniques for transformer energization transients. These include introducing a pre-insertion resistor, controlling the switching time using the point-on-wave voltage at energization, varying the impedance of the power supply, and controlling the residual flux inside the transformer core during transformer energization [12][13][14][15][16][17][18][19][20][21].…”

“…Inrush currents during transformer energization are widely studied and extensively described in the literature [1,[7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. The survey of already documented research shows that the primary objective is to mitigate the impact of the transient phenomenon during transformer energization.…”

“…The survey of already documented research shows that the primary objective is to mitigate the impact of the transient phenomenon during transformer energization. The efforts of scientists and engineers are concentrated on creating an accurate model of the transformer to be used in the inrush transient studies [12,13,17] as well as investigating the nature (physics) of inrush current and the factors affecting this phenomenon [1,14,16,21].…”

Archives of Electrical Engineering

“…Based on this knowledge it is assumed that the initial conditions are equal to steady state solutions for a linear steady state of work, i.e. the initial conditions for (17) and (20) are as follows:…”

Modelagem para análise de desempenho de fornos micro-ondas no contexto da qualidade de energia elétrica

“…Já em [25], o mesmo desenvolvimento é aplicado para atender três magnétrons. Por fim, em [26] e [27], trabalha-se com a alimentação de três magnétrons, porém utilizando o modelo π do transformador em uma configuração trifásica. Como o campo que constitui a radiação de micro-ondas é alternado no tempo, os dipolos permanecem sempre em oscilação mecânica na frequência das micro-ondas.…”