Frequent Switching of arc furnace in steel company causes a great effect on the insulation of arc furnace transformer winding which in turn may causes a shutdown of production for long periods of time. Therefore, it is necessary to study and analyze the causes of these outages and design an adequate protective device. In this paper the transient overvoltage resulted from vacuum circuit breaker ...

The inter-turn short-circuit fault of a power transformer has large current in the winding, which will cause serious heating and deformation winding may threaten safety transformer. Under this background, paper proposes scheme based on open-delta voltage monitoring identification short circuits transformers. First, mathematical modeling analysis principle transformers are carried out, expressio...

For my final project, I will be constructing a 70V audio amplifier capable of delivering about 200 watts into a network of transformer coupled loudspeakers. My design utilizes a class G (rail switching) output stage for increased efficiency and lessened cooling requirements. The rest of the amplifier circuit is fairly standard: an input differential pair with negative feedback from the amplifie...

Traditionally, magnetic component design has been based on power frequency transformers with sinusoidal excitation. However, the movement towards higher density integrated circuits means that reductions in the size of magnetic components must be achieved by operating at higher frequencies, mainly through nonsinusoidal switching circuits. As this trend continues, computing tools are required to ...

There is the magnetic coupling among control windings of controllable reactor of transformer type (CRT), the decoupling integrated magnetic technology is applied to the structure design of CRT in this paper. To realize the decoupling among the control windings we propose a magnetic integrated structure of CRT by providing low magnetic resistance magnetic circuit for control windings magnetic fl...

This investigation deals with a mathematical model for a distribution transformer including saturation effect. To this end, the equations related to a three phase transformer are specified and the effect of an inter-turn fault is included. Naturally by applying an inter-turn fault the inductance and resistance matrix will change. Thus, unknown quantities of inductances and resistances for compl...

Transformers are essential and important elements of power systems. In the past few years, there has been an increasing concern about the occurrence of turn-to-turn faults in power transformers due to the high costs that unexpected outages cause. It is not always possible to analyze the transformer behavior under such faults under rated conditions, since the tests are largely destructive. There...

Marina A. Tsili, Eleftherios I. Amoiralis, Antonios G. Kladas and Athanassios T. Souflaris 1 Faculty of Electrical & Computer Engineering, National Technical University of Athens, GR-15780, Athens, Greece (e-mail: mtsili@central.ntua.gr, kladasel@central.ntua.gr) 2 Department of Production Engineering and Management, Technical University of Crete, 73100, Greece, (email: eamir@tee.gr) 3 Schneide...