Power transformer rupture and fire resulting from an arcing fault inside the tank usually leads to significant security risks and serious economic loss. In order to reveal the essence of tank deformation or explosion, this paper presents a 3-D numerical computational tool to simulate the structural dynamic behavior due to overpressure inside transformer tank. To illustrate the effectiveness of ...

A procedure for optimum design of a high-power, high-frequency transformer is PresentedThe Procedure is based on both electrical and thermal processes in the transformer and identifies a) the VA-rating of ferrite cores in relation to the operating frequency, , , ) the optimum flux density in the core, and c) the optimum current densities of the windings providing maximum transformer efficiency....

Single phase voltage converter structure with isolation transformer for applications in traction vehicles is presented. This paper shows simulation model of this type of converter and transformer model with modern magnetic material in OrCAD-PSpice simulation program. Two PWM control techniques are compared in order to eliminate voltage and current oscillations in primary winding of the transfor...

The squared-field-derivative method for calculating eddy-current (proximity-effect) losses in round-wire or litz-wire transformer and inductor windings is derived. The method is capable of analyzing losses due to two-dimensional and three-dimensional field effects in multiple windings with arbitrary waveforms in each winding. It uses a simple set of numerical magnetostatic field calculations, w...

The effects of different ribbon widths on the magnetic properties of an amorphous alloy were studied. DSC, TGA, XRD, VSM, SEM and ER techniques were used. For SA1 alloy, the sample during primary crystallization for the 142mm and 213mm width ribbons are quite similar; however the magnetic properties and morphologies are significantly different. Finally, the measurements of a three-phase 2MVA am...

Results from experiments on a tap transformer based grid connection system for a variable speed vertical axis wind turbine are presented. The tap transformer based system topology consists of a passive diode rectifier, DC-link, IGBT inverter, LCL-filter, and tap transformer. Full range variable speed operation is enabled by using the different step-up ratios of a tap transformer. Simulations us...

The squared-field-derivative method for calculating eddy-current (proximity-effect) losses in round-wire or litz-wire transformer and inductor windings is derived. The method is capable of analyzing losses due to two-dimensional and three-dimensional field effects in multiple windings with arbitrary waveforms in each winding. It uses a simple set of numerical magnetostatic field calculations, w...

Power transformer is a major component of power system and it’s correct functioning is vital to system operations. It is quite expensive and has no substitute for it’s major role. It is therefore, very important to closely monitor the in-service behavior to avoid costly outages and loss of production. Many devices such as Buchholz relay and Differential relay have been evolved to monitor servic...

A tunable transformer-based Q-enhancement method for monolithic inductors used in parallel resonant LC tanks is presented. The Q of the inductor that forms the transformer primary is enhanced by cancelling the voltage drop across the series loss resistance of the primary with a voltage of opposite polarity that is induced by a current in the secondary. The circuit allows dc voltage control of Q...

This work presents the complete implementation of a switched-capacitor double-sideband (DSB) to singlesideband (SSB) converter, using discrete components. In order to obtain efficient SSB modulation, a Hilbert Transformer has been used. The implementation of the Hilbert Transformer through recursive allpass transfer functions allows good dynamic range and low sensitivity to errors on implemente...