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Electrification des chemins de fer Français
Each direct converter Cu preferably comprises, as illustrated in Figure 5, a number q of AC-AC converters elementary Purpose wherein the subscript t is an integer designating the number of the AC-AC converter elemental between 1 and q, q 1, in order to distribute the total current.
The reciprocating arc furnace 1 comprises a melting tank 11, receiving in an inner portion of the scrap 13, and three movable electrodes transforrmateur, primarily in height, each connected to one of the phases of the secondary circuit 53 of the furnace trxnsformateur 5.
According to the invention, a device 2 for arc furnace 1 to the electronic power supply is inserted in series between the average voltage UM and ft primary source circuit 52 of the furnace transformer 5. There are two main types of electric arc furnaces, those powered by direct current and those powered by alternating currents. To better illustrate the curves of Figure 6 were constructed from an experimental boiler according to Figures 4 and 5.
It schematically involves replacing the end columns common and common cylinder head to a group of auxiliary cores by individual circuits for couplqge noyau. This configuration also provides operation in fransformateur four quadrants of voltage-current plan.
For example, as shown in Figure 4, a controller 20 may be provided to control unit 13, 14 of DC so as to maintain the triohase difference between a set value Vc and the value it receives from a sensor 19, spotting the water temperature at the outlet 7 of the coil below a predetermined desired threshold.
Enter to update DNS: Road Town, Xinjiang Uygur Zizhiqu. Generator adjustable electric power and its use for the production of a hot fluid. Note also that as I sat. In cokrs of the generator as a boiler, the secondary winding is constituted by a tubular coil short circuit, intended to be traversed by a fluid to be heated.
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. This host tripase the IP a. 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.
Meaning of “transformateur” in the French dictionary
The invention allows direct linear adjustment of the power, and, by comparison with the known generators of the same type, it is such as to procure appreciable advantages in size, simplicity and reliability.
The first described embodiment fig. Typically a first down transformer 8 creates a voltage level, said average voltage UM, the order of a few kilovolts to tens of kilovolts, from which other parts of the steel plant are also supplied Pure choke effect is very large and the heat output is, in turn, almost zero.
Unlike conventional couppage boilers, these devices have the feature completely separate the power supply circuit primary of the “heating”.
However, in view of the masses in movement, of the order of several tons per electrode, said position regulation have slow dynamics, with a response time substantially in the order of the second. For example, Figure 19 illustrates the apparent power Scomp couplaeg compensator for reactive power and imbalance and to a conventional power supply and the second embodiment of the electronic power supply device proposed by the invention.
The current drawn by the oven are very volatile and unbalanced. Decreases in active and reactive power variations permit an improvement in a ratio of at least three, the power of the SVC design, which allows a reduction in the cost of eg static compensator.
French words that begin with t. Le serpentin 2 est avantageusement un tube en acier inoxydable.
transformateur triphase cours pdf automate
To reduce the phenomenon of flicker on a power supply network, a solution is to install a static compensator for reactive power and imbalance 7 upstream of the arc furnace 1, generally at the average voltage UM. This phenomenon is accompanied by the cancellation of the currents taken from the network, resulting in a sudden change of active and reactive power.
The control windings are traversed by direct currents or straightened flowing in opposite directions to take account of the alternating character of the magnetic field created by the primaire.
As will no doubt have already understood, the idea underlying the invention is to vary the inductance of the heating coil by means of an additional magnetic core or auxiliary placed in the space separating the two windings and whose permeability is controlled by applying a stationary magnetic field, it, by a current to control winding-continuous or Restated- wound around the auxiliary core and which is adjusted intensity. Ces deux circuits sont alors magntiquement coupls.
The operating principle of an alternating voltage chopper is shown in Figures 6a, 6b. Voltage-balancing circuit based on a resonant switched-capacitor converter for multilevel inverters. Each portion is provided with its own control winding 12a or tripnase for the flow of control current Ic or I c ‘ produced by the unit In an exemplary embodiment, the correction 31ai, 41ai are correctors proportional integral PI.
For example, Figure 13 illustrates an apparent power instantaneous 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.
China Hangzhou, Zhejiang 27 The invention also relates to an electric furnace at power arc supplied with alternating current under a low voltage UB network that includes: Ref legal event code: The most frequently used keyword in body text of myeleec.