JPH0132645B2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to transformer windings.

[Prior art]

For the purpose of mitigating the influence of harmonics on the 12-phase rectification system or the power supply, such as a rectifier transformer,
In some cases, a transformer is used in which the next winding is divided into two groups, one group being Δ-connected, and the other group being Δ-connected.

In this circuit, if there is a difference in leakage impedance between the two windings, a current imbalance occurs, causing problems such as overloading one winding.

Therefore, both windings must be arranged so that their leakage impedances are equal, that is, their leakage areas are equal.

Figure 1 shows a conventional example, where the primary winding 1 and the secondary
The connected winding 2 and the secondary connected winding 3 are arranged concentrically, and the secondary △ connected winding 2 and the secondary connected winding 3 are arranged concentrically.
are arranged alternately in the height direction so as to equalize the leakage impedance between them and the primary winding.

Each secondary winding consists of a plurality of upper and lower pairs of disc coils each having the required number of windings, which are stacked alternately, such as secondary △ connected windings and connected windings, and are connected to external lead conductors 6 and 7.
are connected in parallel to each other.

However, in such a structure, it is necessary to manufacture a large number of disc coils 2 and 3 having the required number of turns depending on the current and voltage, and connection points with the outlet conductors 6 and 7 are also required, which increases the manufacturing man-hour. was increasing.

Further, since a space is required for the connection between the disc coils 2 and 3 and the outlet conductors 6 and 7 and a space for the outlet conductors 6 and 7 themselves, the winding structure has a low space factor.

[Purpose of the invention]

The present invention has good workability, improves the space factor,
Another object of the present invention is to provide a transformer winding in which the leakage impedance between the primary and secondary groups is almost equal.

[Summary of the invention]

In order to improve workability and space factor, each secondary winding is combined into one block.

In addition, the dimensions of the normally connected winding are larger than those of the △ connected winding, and in order to match the leakage area, it becomes necessary to manipulate one of the winding conductors or the cooling duct, which is uneconomical.

It is known that in a transformer that cools the windings with a refrigerant, the cooling effect increases as the height difference between the radiator and the windings serving as a heat source increases.

By arranging the secondary connected winding at the lower part where the cooling effect is large, the conductor size or the cooling duct size can be reduced, and the leakage area can be economically matched with the secondary Δ connected winding.

Taking into consideration etc., divide the secondary winding into two, and make △
The wire connections are placed at the top and the wire connections are placed at the bottom.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 3, the primary winding 1, the secondary Δ-connection winding 9, and the secondary connection winding 10 are arranged concentrically, with the secondary Δ-connection winding 9 on the top and the secondary Δ-connection winding 9 on the top. 10 is placed at the bottom.

FIG. 4 shows the shape of the secondary winding, and although a sheet-like conductor is used in this example, a plurality of rectangular wires may be used in parallel.

Since the winding wire can be wound continuously between the two groups with an insulator interposed between the layers, the winding work is greatly improved compared to the conventional example.

In addition, by winding the lead of each secondary winding inside the winding, connection work can be omitted, connection space is also unnecessary, and the space factor can be greatly improved.

On the other hand, it is necessary to equalize the leakage impedance between the secondary △ wired winding and the primary winding, but the current capacity of the normally wired winding is higher than that of the △ wired winding. Therefore, if the same winding material is used, losses due to increased stray loss will increase. If the loss and temperature rise values are the same as those of the Δ-connected winding, the conductor dimensions and cooling duct will be thicker, and the leakage area will be different.

Furthermore, if the leakage area of the Δ-connected winding were to be combined with that of the connected winding, an adjustment member would have to be inserted, resulting in an uneconomical configuration.

Considering cooling efficiency here, it is known that the greater the height difference between the windings, which are internal heat sources, and the external heat radiating device, the better the cooling efficiency.

As shown in Figure 5, △ connection winding 9 center and heat sink 1
The relationship between the height difference △H1 from the center of 1 and the height difference △H2 between the center of the connected winding 10 and the center of the heatsink 11 is expressed as △H1
If <△H2, the connected winding 10 placed on the lower side
The cooling effect increases and it is possible to provide some leeway in terms of temperature.

By matching the conditions with the △ wire-connected winding, the conductor dimensions and cooling duct dimensions can be reduced, and the leakage area can be easily and economically matched.

In addition, the arrangement of the secondary windings is reversed, △ the connected winding is placed on the bottom, the connected winding is placed on the top, and △ the connected winding is made of a material with low conductivity such as aluminum, and the connected winding is made of a material with low conductivity such as copper. If a material with high conductivity is used, the △-connected winding will also be large, and an economical method of matching the leakage area can be considered.

Further, although the secondary winding is arranged outside the primary winding in the embodiment, it is also possible to arrange it inside the primary winding.

〔Effect of the invention〕

According to the present invention, the workability and space factor of the winding are improved, and the leakage impedance of the two groups of secondary windings can be economically made almost the same.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the arrangement of conventional transformer windings, FIG. 2 is a detailed view of the upper part of FIG. 1, FIG. 3 is a sectional view showing the arrangement of transformer windings according to the present invention, and FIG. 5 is a perspective view showing a connecting portion between an outlet conductor and a sheet-like conductor, and FIG. 5 is a sectional view showing the positional relationship between a transformer winding and a radiator. 1...Primary winding, 2...Secondary △ connected winding, 3...
... Secondary connection winding, 4 ... Insulator, 5 ... Insulator, 6 ... Lead conductor, 7 ... Lead conductor, 8 ... Iron core, 9 ... Secondary △ connection winding, 10 ... ...Secondary connection winding, 11...Radiator.

Claims (1)

[Claims] 1. In a transformer that has two groups of transformer windings, wire-connected and △-connected, on the secondary side, a tank containing a refrigerant for cooling the transformer windings, and a radiator that communicates with the tank. A transformer winding characterized in that the transformer winding is divided into two parts in the axial direction and arranged above and below, with a △ connection in the upper part and a connection in the lower part.