JPS58110016A - Transformer - Google Patents

Abstract

PURPOSE:To contrive the weight to be smaller and to reduce loss by a method wherein a single-phase four-leg iron core is used, and exciting windings and tap windings are wound on two legs of the iron core respectively, and both exciting windings are connected in parallel and both tap windings are connected in series. CONSTITUTION:An iron core is composed of a single-phase four-leg iron core consisting of two main legs 11, 12 and two side legs 13, 14 and a yoke 15. An exciting winding 21 and a tap winding 31 are wound in concentric shape from inside on the main leg 11. In the same way, an exciting winding 22 and a tap winding 32 are wound from the inside on the other main leg 12. The exciting windings 21, 22 are connected in parallel, meanwhile, the tap windings 31, 32 are connected in series to compose the whole tap winding. Therefore large sized tap winding can be prevented. Furthermore, stray loss by winding leakage magnetic flux can be reduced as side legs are provided in addition to the main legs. Therefore, this can contrive the weight to be smaller and reduce loss.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a transformer VC, and particularly to the construction of a transformer suitable for performing negative voltage control.

Technical Background of the Invention In recent years, as the demand for electric power has increased, power transmission voltage has increased, and transformers have become extremely high-voltage and large-capacity warehouses. Transformers have also been manufactured and are in operation.

When adjusting the voltage of such a large transformer, if the tag winding is provided in the main transformer, the size and quantity will increase, making it impossible to keep it within the transportation restrictions such as railway transportation. Therefore, as explained in Ayachi, a method has been adopted in which the voltage is adjusted by combining a main transformer without tap winding or W with a load voltage regulator.

Figure 1 shows a conventional example of an excitation transformer constituting such a load voltage regulator; (a) is its structural diagram;
(b) is the wiring diagram. In the figure, 1 is a single-phase tripod iron core, and an excitation winding 2 and a tap winding l1iI3 are wound around the main leg. Although only one connection lead 4IIl is shown in Figure 1 for connecting the tag winding 3 to the main line or the tap changer, each of the three-phase load tap changer Corresponding connection to the phase selector,
In some cases, hand-carved tap changers can be used.

Problems with the technical backgroundHowever, recently, electricity? l! Due to the growth in electricity demand, there is an increasing demand for an increase in the capacity per transformer, and there is also a growing demand for a wider voltage adjustment range to facilitate system operation. In order to meet such requirements, the on-load voltage regulator must also increase its capacitance ili or cod f voltage. In this case, in the above conventional configuration, insulation that can withstand the entire tap voltage induced when a surge enters is required for each leg of the winding, so as the tap voltage increases, reinforcing the insulation in the tag winding INB becomes a fee. This has the disadvantage of increasing the size of the windings and increasing the heat resistance of the equipment.

Purpose of the Invention In view of the above-mentioned nine points, it is an object of the present invention to provide a transformer that is lighter in weight and has less loss.

SUMMARY OF THE INVENTION In order to achieve this object, the present invention uses a single-phase four-legged iron core, and winds an excitation winding shaft and a tag winding around the two main legs of this animal core, respectively. While the excitation windings on the legs are connected in parallel, the Tatsuzo windings are connected in series to form the overall tap winding to form a transformer, and when creating a three-phase transformer, three of these should be combined. EMBODIMENT OF THE INVENTION The present embodiment will be described below with reference to the drawings. FIG. 2 shows a single-phase load special voltage regulator according to an embodiment of the present invention. It shows the excitation transformer that constitutes it, with (1) its structural diagram and (b) its wiring diagram.

In the figure, the iron core is connected to two main legs 11.12 and two 0
It consists of a single-phase four-leg iron core consisting of side legs 13, 14 and yoke 15, and the main leg 11 has an excitation winding 211 tap winding # from the inside.
31, the excitation winding 22 is attached to one of the main landing gears 12 from the inside as well.
, Tapsha Ii! The excitation windings 21 and 22, which are wound concentrically in the order of 1132, are connected in parallel as shown in the figure, and the cod windings 11131 and 12 are connected in series to form the entire tag winding. ◇Therefore, tag winding 3
1.32 each has a capacity of about half of all the tap windings O According to the above configuration, since the tap windings 31.32 are connected in series, each tag winding 31 is induced when a surge enters.
．． The shared voltage of 32 is about half the shared voltage of all the tag windings. Therefore, even if the voltage of the tag winding increases, the reinforcement of insulation within each tag winding 31 and 32 can be reduced compared to the conventional method, and the tag winding can be prevented from increasing in size. The total number of tap leads 4 is distributed among the tap windings 31 and 32, which simplifies the drawer structure.

Furthermore, by providing a hooked leg in addition to the main leg, stray loss due to leakage magnetic flux from the windings can also be reduced.This will be explained with reference to FIGS. 3 and 4. In addition, the yf! f1111! This is an explanatory diagram of the flow of leakage magnetic flux, and in order to simplify the explanation,
The windings Im in the single-phase two-legged core and in the two main legs of the single-phase four-legged core are omitted.

That is, when a tripod core is used as shown in FIG. 3, the excitation windings 21 and 22 are connected in parallel, so the core legs 16
．． The main magnetic flux 51,52 passing through 17 becomes steeper and induces the same voltage in the two excitation windings. Therefore, the winding leakage magnetic flux 6 due to energization of winding lll1122.32
Most of the iron does not enter the core leg and flows outside, such as the tank wall 7. Therefore, there is a risk of increased stray loss on the tank wall and even local overheating.

On the other hand, when a four-branched iron core is used as in this embodiment, the main magnetic fluxes 51.52 passing through the main legs 11 and 12 of one iron core are equal, as shown in Figure 4, and the two excitation windings @ 21.2
The point that the same voltage is induced in 2 is the same as in Figure 1, but
Since the animal center side j1113.14 is provided outside the tap winding, most of the leakage magnetic flux 8 due to energization is directed to the -1 leg 14 as part of the return path. In this case, since the iron core is made of an excellent low-loss material, the stray loss due to this leakage magnetic flux is extremely small.

The extreme case in which the 11 current flows only in one tap winding has been described above, but the same can be said in the case where the capacitances of the two legs are at slightly different tag positions. Therefore, according to this embodiment, it is possible to obtain an excitation transformer with a single-phase load voltage BA rectifier, which has a small stray loss, a large capacity gain, and excellent quality such as prevention of overheating.

It goes without saying that by combining three single-phase load special voltage regulators using the excitation transformers described in #JiL in the two-cell example above, a three-phase load noodle pressure regulator can be obtained. 0 In this case, it goes without saying that the 31-way single-phase voltage regulator may be connected through an oil submerged duct, or the contents may be configured by installing three of them in one tank. Ruru. Further, in the above embodiment, the windings are arranged in the order from the iron core to the excitation winding and one tag winding, but they may be arranged in the order of tap winding and excitation winding. Furthermore, in the above embodiment, for convenience of explanation, the tap lead is drawn out from the middle of the tag winding, but in reality, each tag winding is wound in the same cylindrical shape, and the valley tag is pulled out from the top and bottom ends of the winding. It goes without saying that he often draws out leads. Furthermore, in the above embodiments, the excitation transformer of the on-load voltage regulator was explained as an example, but the present invention is not limited to this, and it goes without saying that, for example, a tag switching transformer or the like may be used.

Effects of the Invention As described above, according to the present invention, a transformer with light cover force and low loss can be obtained.

[Brief explanation of drawings]

Figure 1 shows the internal configuration of a conventional load voltage regulator.
(a) is a structural diagram of the excitation transformer, (b) is a wiring diagram thereof, and FIG. Structure diagram of transformer,
(b) is its MIilII diagram, Figure 3 tl'im 2
An explanatory diagram of leakage magnetic flux in a transformer with a structure different from that shown in the figure,
FIG. 4 is a diagram of leakage magnetic flux in the transformer of FIG. 2. 1... Single-phase tripod core, 2.21.22... Excitation winding weight 3.31.32... Tap winding holder, 4... Tap lead, 6, 8-... Winding leakage magnetic flux , 7...tank wall,
11.12... Main landing gear, 13.14... Cocktail gear, 15.
...Yoke, 16°17...Iron core leg, 51.52...
Main magnetic flux. (9)

Claims (1)

[Claims] (1) An excitation winding and a tag winding are wound around the two main legs of the single-phase tripod core, respectively, and the valley excitation wires of the two main legs are connected in parallel with the same ±Fi, while the tag A transformer characterized in that the windings are connected in series to form a tag winding. (2. In the first aspect of the claim, the transformer is characterized in that three transformers having the above configuration are combined to form a three-phase transformer.