JPS6022815B2 - transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transformer having multilayer cylindrical windings arranged in a D-shape on a transformer core.

1 and 2 show a conventional transformer having a cylindrical winding. The body 3 consists of a wire conductor 31 spirally wound around an insulator 2 and an end insulating member 32, and is arranged in four layers with a gap formed by an insulating spacer 33 to form a cooling duct 34. A secondary winding consisting of cylindrical coils 35 to 38, 4 a cylindrical insulator disposed on the outer periphery of the outermost secondary winding 3, 5 an insulating spacer 51 on the outer periphery of the insulator 4; Secondary winding 3 through
This is the primary winding arranged in the same D shape.

In the conventional device configured in this way, the secondary winding 3 is 1
Because the number of radial conductors that make up the layers is small, it has the disadvantage of being weak against electromagnetic mechanical force that acts when a short-circuit current flows through the windings.

The present invention was made to eliminate the drawbacks of the conventional transformer, and in a transformer having a multilayer cylindrical winding, at least two of the coil layers on the side facing other windings on which a large electromagnetic force acts A strong winding structure is provided by closely adhering the layers and placing the remaining layers through cooling ducts.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

That is, in FIGS. 3 and 4, numeral 39 is an interlayer insulator disposed between the cylindrical coils 37 and 38 and integrally forming the coils 37 and 38.

Note that the other configurations are the same as those shown in FIGS. 1 and 2, so explanations will be omitted. Further, the interlayer insulator 39 can be omitted if necessary. Furthermore, if an interlayer insulator coated with adhesive is used, the degree of coupling between the coils on both sides of the interlayer insulator will increase, and the strength against short-circuit electromagnetic force will be further strengthened.

If F is the radial electromagnetic force acting on the entire secondary winding in a device configured in this way, then in the case of a four-layer cylindrical coil, the first layer coil 35 from the inside is at point XF, and the second coil is at point XF. 3 Hada Toki XF, Ryo 6XF for the third layer coil 37,
The electromagnetic force of Ryo 6XF acts on the fourth coil 38. In general, the seating limit pressure of a winding conductor, which is an index of the electromagnetic mechanical force resistance of the winding, is proportional to the index of the number of conductors in the radial direction constituting one layer.

It is now assumed that each layer of the four-layer cylindrical coil is composed of one strand conductor in the radial direction.

In the conventional type shown in Figs. 1 and 2, the buckling limit pressure of the outermost layer winding conductor, where the largest electromagnetic force acts, is FB
=KXnji=KXI.

Here, FB is the buckling limit pressure of the conductor, K is the proportionality constant, nb
is the number of conductors arranged in the radial direction, and y is the coupling coefficient (1 mm y mm) of the radial green conductor.

On the other hand, in the embodiment of the present invention shown in FIGS. 3 and 4, the third and fourth layers are tightly wound through the interlayer insulator 39, so that "electromagnetic mechanical force is not applied." When
The third and fourth layers work together as one. In other words, both the 3rd and 4th layers receive the electromagnetic sword of Ryo 6 x F Juumote XF = Kumo F.
On the other hand, the buckling limit pressure of the winding conductor is FB=K×2 (when y=1) to K×8 (when y=3).

Taking the ratio of the electromagnetic mechanical force acting on the winding layer to the buckling limit pressure (buckling limit pressure/electromagnetic mechanical force), and comparing the secondary winding and the winding of this invention, the secondary winding: this invention It can be seen that the winding of the present invention is strong against electromagnetic mechanical force.

As described above, the transformer according to the present invention integrally couples at least two cylindrical coils on the side of the secondary winding facing the primary winding, and the remaining cylindrical coils are arranged with a predetermined gap from each other. This makes it possible to significantly improve the resistance to electromagnetic mechanical force when a short-circuit current flows through the windings.

[Brief explanation of the drawing]

Figures 1 and 2 show a transformer having a cylindrical secondary winding. 3 and 4 show an embodiment of the present invention, FIG. 3 is a longitudinal sectional view of a main part, and FIG. 4 is a sectional view taken along the line W--W in FIG. 3. In the figure, 1 is the iron core, 2 and 4 are insulators, 3 is the secondary winding, and 31
32 is a wire conductor, 32 is an end insulating member, 33 is an insulating spacer, 34 is a cooling duct, 35 to 38 are cylindrical coils, 39
5 is an interlayer insulator, 5 is a primary winding, and 51 is an insulating spacer. Note that the same reference numerals in the drawings indicate the same or corresponding parts. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. In a device having a secondary winding in which a plurality of cylindrical coils are arranged concentrically with respect to an iron core, and a secondary winding that is electromagnetically coupled to the secondary winding, the secondary winding has a surface facing the primary winding. 1. A transformer characterized in that at least two cylindrical coils on one side are integrally coupled, and the remaining cylindrical coils are arranged at a predetermined gap from each other.