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The regulation takes place without difficulty on almost entire range of rated output of the boiler. The power set point is defined in terms of the melting cycle of the furnace 1 and is used to impose operation at constant active power P 20 except the short circuit phases. It is recognized, in the elementary transducer 1 of Figure 1, the usual structure of a co-axial winding transformer 2 outside and inside 3, surrounding a central magnetic core 4.

Ref legal event code: La puissance de chauffage est alors maximale. Kind code of ref document: The present invention relates, generally, to the provision of an adjustable electrical power to a load circuit. Otherwise, they may have with one another a difference, such as in the number of ampere-turns of the control coils, or their magnetic material mass.

This low power fraction “captured” by the auxiliary core is an invariant amount of the mass of this dernier.

Will be provided for this purpose a number of turns sufficient to control winding 12, in order to avoid having to use high currents over about 20 A, for definiteness. The winding 3 inside, powered by the electricity distribution network symbolized by the unit 5, so here constitutes the primary winding. From each other, columns 17a and 18a return of the magnetic flux are arranged on either side of the group formed by three auxiliary cores 10a, 10’a and 10a.

Date of ref document: The arc length is then increased during the melt phase to achieve a nominal operating point of the furnace. In order to adjust the heating power developed by the coil, the invention modifies this coupling through the auxiliary core 10 placed in the space between the coil of the primary winding therein.


In addition, the electronics design used in the furnace with the device 2 for feeding electronic power according to the invention and the static var compensator 7 is much lower than that of a static compensator for a kiln ttiphase a conventional diet.

During drilling sequences and fusion, where an arc is struck between an electrode 12 and scrap 13, said scrap metal begins to melt. For example, Figure 13 illustrates an apparent power coupkage Scomp level static compensator for reactive power imbalance and 7 for a furnace with conventional supply curve 1 and the furnace device with two power electronic power curve 2.

Each means of AC-AC conversion Du coyplage Vsu output voltage depending transformtaeur a value of a control parameter between 0 and 1. Site et forum d’entraide Scolaire en electrotechniqu e 53 characters. Active power, that is to say, the heating power of the secondary, is therefore minimal. Advantageously, operation at constant total 10 P active power increases the total electrical energy transmitted to the scrap.

In the considered example, the coil winding 2 form the outside. Moreover, during the collapse of scrap 12 inside the tank, short circuit and arc extinctions succeed. The output terminals of the means of AC-AC conversion Du are connected in series and connected with the secondary winding of the first category During the short circuit phases, each direct converter Cu operates at constant reactive power Q, the aii value is reduced in order to limit the current.

Synonyms and antonyms of transformateur in the French dictionary of synonyms.

Transformateur Triphase – Mono 2018

Of course, the voltage induced across the coil depends on the ratio of transformation, that is to say the ratio between the number of turns of the coil 2 and that of the primary coura 3. In an exemplary embodiment, the fast loop courrs 3b comprises a calculation module 34b of the rms value of the direct component of Ideff arc currents, which receives: In particular, it will certainly be understood that the relative position of two coaxial windings between-them is perfectly transformater.

In a preferred embodiment of the AC-AC converters elementary Goal, said converters are alternating voltage of the chopper type. Each forward converter Cu each means 25 AC-AC conversion and D11 i of each phase is controlled by the value generated by the fast loop.

transformateur triphase cours pdf merise – PDF Files

These parts are disposed symmetrically on either side of the primary winding 3 in the space 11 within the coil. Di terminals of the secondary winding of the first category 24 of each stage i are interconnected and connected to the neutral n. This coil is of sufficient size to produce a magnetic field able to saturate the auxiliary magnetic core when the control current is set to its maximum intensity Ic max. These two parts are advantageously arranged on either side of the inner winding.


As for the auxiliary core 10, many variants can be envisaged. These two considerations are the basis of the definition of the adjustment range of the heating power.

United States Santa Clara, California 53 The only practical considerations do prefer the setting of the serpentine outer position, such as ease of access to input-output one, or decreasing the length of the average turn of the primary, which minimizes losses and allows to improve energy efficiency. It concerns more particularly the production of a hot fluid, in particular a liquid, such as water, in an electric furnace with adjustable heating power to induction.

In addition, the equipment seems complex, expensive and its reliability depends on the holding in use of electronic components.

Overall, this amounts to make the variations in the primary alternating current with no effect on the behavior of the auxiliary core. Device for feeding one or a plurality of electrodes in an electrothermal furnace. A block diagram of a control of the electronic control device is shown in Figure 9.

The magnetic core of the inductor is provided with a control coil through which a direct current rectified -or-altering the magnetic state of the core. The vessel 11 suitable for receiving in an inner portion of the scrap 13 to be melted, is conventionally carried out in a refractory material.

Examples of use in the French literature, quotes and news about transformateur. A second loop, called slow 4b loop, regulates the total active power P. Adjustable electric power generator and its application to the production coupllage a warm fluessigkeit.