SU1064329A1 - Power three-wound step-down transformer - Google Patents

Abstract

) POWER TRAVELING FLOWING DOWNTING TRANSFORMER, containing a core magnetic core, a primary and a cylindrical winding placed in one condenser and divided in two parts of the same width, connected in parallel, two secondary cylindrical windings, about 20 tons and two tangles and with the same reducing the consumption of the winding wire, improving the quality of the transformed electric power and reducing the short-circuit currents in the secondary windings, the secondary windings are made with the same width and are located in another re, the height of each of them is made equal to the height of the part of the primary winding corresponding to it, and the height of the different secondary windings and parts of the primary winding are made according to the ill.Sj Hj Sa where H (by S is the primary power winding and its corresponding secondary winding; H- and S, the height and nominal power of the other part of the primary winding and corresponding to it of another secondary 35 winding. {: ND: about

Description

The invention relates to electrical engineering and can be applied in the manufacture of power transformers in electrical form. Power three-winding step-down transformers are known, containing a rod magnetic system, windings, made in the form of cylindrical coils concentrically arranged around a rod and divided from one another to another scattered wire. The winding is located in at least one concentr. The primary winding in low-voltage transformers is a power winding, made to a higher voltage (vh), and in order to use the window of the magnetic conductor most efficiently, they are located in the outer concentrator. The secondary windings are energized, made to the lowest (HH) and average (cn) voltages and are located in internal concentrations. Nominal power kg1Other of the three windings are equal to the rated power of the transformer l The disadvantage of this transformer is the poor use of the winding circuit because the secondary windings are not loaded at full power. The closest to the present invention is a power three-winding step-down transformer containing a core magnetic conductor, a primary cylindrical winding placed in one concentrator and divided into two parts of the same hole connected in parallel, and two secondary cylindrical windings 2. A disadvantage of the known construction is a strong electromagnetic b secondary windings, which leads to a large multiplicity of short-circuit currents: due to the feeding of the short-circuited one of the windings from the other toric on skeins. For example, in an average secondary winding, the ratio of the steady-state short circuit current relative to the nominal 110 kV transformer may be 14. To ensure the dynamic resistance of the secondary fed windings during a short circuit, it is necessary to increase the cross-sectional area of the windings, i.e. additional increase in magnet wire consumption. Moreover, a strong electromagnet in relation to each other of the secondary fed windings leads to a strong mutual influence of the operating modes of each of these windings on each other, which results in sharp voltage fluctuations at the terminals of one of the secondary windings when the load of the other changes. windings. This ultimately reduces the quality of electricity by the criterion of voltage stability. The purpose of the invention is to reduce the consumption of the magnet wire, improve the quality of the generated electricity and reduce the short circuit current. This goal is achieved by the fact that in a power three-winding transformer containing a core magnetic conductor, a primary cylindrical winding placed in one concentrator and divided into two parts of equal width, connected in parallel, two secondary cylindrical windings, secondary windings are made with the same width and are located in . OTHER concentra, the height of each of them is made equal to the height of the corresponding part of the primary winding, and the heights of the different secondary windings and parts of the primary winding are made according to h Ei n, s. where H and S are the height and nominal power of one of the parts of the primary winding and the corresponding secondary winding) is the height and nominal power of the other part of the primary field and the corresponding other secondary winding. The drawing shows the proposed transformer, a longitudinal section. The transformer contains a core magnetic circuit 1, the primary winding 2, made of two parts 3 and 4, connected in parallel with an equal width (size along the radius) and placed in one concentrator. The two secondary windings 5 and 6 are also made with the same width and are located in a different center. The sum of the rated power of the secondary windings is equal to the nominal capacity of the transformer, as well as the sum of the parts 3n 4 of the primary winding 2, the height of part 3 and the secondary winding 5, part 4 and winding 6 are equal to each other, and parts 3 and 4 of the primary winding 2 and both secondary windings 5 and 6 are made with different heights (dimensions along the axis of the transformer according to AND 5 H, s; where H and 5 (- height and rated power of one of the parts (for example, part 3

the primary winding 2 and the corresponding secondary winding (for example, winding 5),

the height and nominal power of another part (for example, part 4) of the primary winding 2 ° and the corresponding other secondary winding (for example, winding 6).

The sum of the nominal power of parts 3 and 4 of the primary winding 2 is equal to the rated power of the transformer. With the proposed arrangement of the windings, the electromagnetic coupling between the parts of the lane / V is sharply weakened.

V ///////////////

primary winding, which reduces the multiplicity of short-circuit currents. For example, in the winding 6, the ratio of the short circuit current from 14 can be reduced to 9.5. Therefore, to ensure the dynamic resistance of the windings 5 and 6, no additional investment of the winding wire is required, as a result of which their nominal power is reduced due to a decrease in the winding wire consumption at.

This improves the quality of the electrical power on the tires of the secondary windings, and

I also reduces the cost of devices 5 connected to these windings (switches, busbars, etc.) by reducing the short-circuit currents acting on them.

V ////////////////////

Claims (1)

A POWER THREE-WAY DOWNWATER TRANSFORMER, containing a core magnetic circuit, primary cylindrical winding, placed in one concentrate and divided into two parts of the same width, connected in parallel, two secondary cylindrical windings, with no connection with the fact that in order to reduce the consumption of the winding wire, _ improve the quality of the transformed electric energy and reduce short-circuit currents in the secondary ► winding circuits, the secondary windings are made with the same width and are located in another concentrate, the height of each of them is made equal to the height of the corresponding part of the primary winding, and the height of different secondary windings and parts of the primary winding is made according to H ₄ 5, H, H _g 'where H; and S and 5 ₂ - Height and rated power § of one of the parts - the primary winding and the corresponding secondary winding, - the height and rated power of the other part of the primary winding and the corresponding other secondary winding. SU ,, „1064329