JPH0653053A - Winding for stationary induction apparatus - Google Patents

Abstract

PURPOSE:To provide an interleave winding capable of miniaturizing the whole winding while making the temperature gradient easier as well as the increase in cooling efficiency and the reduction in thermal deterioration feasible. CONSTITUTION:The second conductor (b) formed in a hollow shape with a cooling medium sealed up therein comprises a heat pipe. In such a constitution, one connecting end at respective brazed parts A of the second conductor (b) is extended to form a heat dissipation part 51 wherein a fin 51a is provided. On the other hand, the wound up part of the second conductor (b) comprises a heat detector 52.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding wire for a static induction device such as a transformer and a reactor, and more particularly to a winding wire for a static induction device with improved cooling performance.

[0002]

2. Description of the Related Art FIG. 5 shows an example of an interleaved winding which is a conventional winding for a static induction device. In the figure,
The first conductor a is formed of 1a, 2a, ..., The second conductor b is formed of 6b, 7b, ..., and each number indicates the winding order. [1], [2],
[3], ... Are winding groups interleaved with the first conductor a and the second conductor b, respectively, and constitute the interleaved winding 1 as a whole.

The initial potential distribution Vn when the surge voltage V enters the interleaved winding 1 is determined by the series capacitance k of the winding and the ground capacitance c. It is expressed by equation (1).

[0004]

[Equation 1] 1x is the distance from the end of winding, and 1 is the total winding length. The initial potential distribution Vn is X and Vn / V with α as a parameter.
6 is obtained, and it can be seen that the smaller α is, the closer the initial potential distribution becomes to the straight line and the smaller the vibration. To reduce α, the ground capacitance c may be reduced or the series capacitance k may be increased. The interleaved winding 1 is a winding whose initial potential distribution is improved by increasing the series capacitance k among them.

Such an interleaved winding 1 is shown in FIG.
Two sets of conductors a and b are wound in parallel as shown in FIG.
It is designed to be manufactured by a method in which the both are connected by brazing or the like at the location indicated by.

As a cooling method for this interleaved winding 1, conventionally, the entire winding is immersed in insulating oil,
There are methods that allow natural convection of the insulating oil around the winding or forced circulation. In addition, as another method, recently,
In some cases, SF6 gas is used as the cooling medium, but in any case, the cooling medium around the winding is used for cooling.

[0007]

However, in the above-mentioned conventional cooling method, a cooling medium flow path for cooling must be formed around the winding, which causes a problem that the entire winding becomes large. . Further, in such a conventional cooling system,
There is also a problem that the cooling medium has a long path, the temperature difference between the windings is large, and the cooling efficiency is poor. Furthermore, when looking at the heat deterioration and temperature gradient of the winding, the heat deterioration depends on the temperature on the high temperature side, and this temperature gradient must be taken into consideration in the cooling design of the winding. From this point as well, the size of the winding becomes large, which in turn causes the size of equipment such as transformers and reactors that use this winding.

The present invention has been made in consideration of the above circumstances, and an object thereof is to make it possible to reduce the size of the entire winding and to reduce the temperature gradient to improve the cooling efficiency and reduce the thermal deterioration. It is to provide a winding for a static induction device that can be achieved.

[0009]

According to another aspect of the present invention, there is provided a winding for a static induction device, wherein at least one of the conductors wound in parallel is formed in a hollow shape, and the cooling medium is provided inside the hollow conductor. It is characterized in that a heat pipe is configured by enclosing.

A winding for a static induction device according to a second aspect of the invention is
At least one of the conductors wound in parallel is formed in a hollow shape, and a hollow radiator is connected to this hollow conductor via a hollow connector made of an electrical insulating material. The feature is that a cooling medium is enclosed inside the body to form a heat pipe.

[0011]

In the invention of claim 1, since the winding is cooled by the heat pipe constituted by the conductor itself, unlike the conventional one in which the cooling medium is circulated around the winding, miniaturization is achieved. Can be achieved. Further, since the heat pipe has a large heat carrying capacity and the heat carrying path is shortened, the temperature gradient is lowered and the cooling efficiency is improved.

According to the second aspect of the present invention, in addition to obtaining the same effect as the above, since the heat radiator is electrically insulated, the voltage used for the winding is high, and the heat radiator may be insulated. Even in such a case, it can be sufficiently used.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 3, the first conductor a is formed of 1a, 2a, ...
The second conductor b is formed of 6b, 7b, ....
Each number indicates the winding order. [1],
[2], [3], ... Are winding groups interleaved with the first conductor a and the second conductor b, respectively, and constitute the interleaved winding 1 as a winding for a static induction device as a whole. is doing.

The second conductor b is formed in a hollow shape, and a cooling medium is enclosed inside the second conductor b to form a heat pipe. In each brazing part A of the second conductor b, one connection end is extended to form a heat dissipation part 51, and the heat dissipation part 51 is provided with a fin 51a. The wound portion of the second conductor b serves as the heat receiving portion 52.

In this structure, the heat generated in the first conductor a is heat-conducted so that the heat receiving portion 52 in the second conductor b is generated.
Transmitted to. Further, the heat generated in the heat receiving portion 52 itself in the second conductor b is carried to the heat radiating portion 51 by the heat pipe configured by itself, together with the heat transmitted from the first conductor a. In this case, the heat transfer path from the heat generating section to the heat radiating section 51 can be extremely short as compared with the conventional cooling method. Therefore, the temperature of the entire winding 1 is equalized, the difference between the average temperature and the maximum temperature is reduced, and the cooling efficiency is improved. Further, unlike the conventional one in which the cooling medium is circulated around the winding, the dimension B in FIG. 3 may be the minimum required for insulation, which increases the series capacitance of the winding 1. The potential distribution can be further improved. Together, these can greatly reduce the overall size.

FIG. 4 shows a second embodiment of the present invention, which is different from the first embodiment in the following points. That is, for the second conductor b formed in the hollow shape, the separate heat radiator 53 in the hollow shape is connected to the hollow connection body 5 made of an electric insulating material.
It is configured to be connected via 4.

According to this embodiment, in addition to obtaining the same effects as the above, since the radiator 53 is electrically insulated, the voltage used for the winding 1 is high and the radiator 5
It can be sufficiently used even in the case where the insulation of 3 is concerned.

Although the second conductor b is formed in a hollow shape in each of the above embodiments, the first conductor a may be formed in a hollow shape to form a heat pipe, or both conductors a and b may be hollow. It may be formed into a heat pipe structure.

[0019]

As is apparent from the above description, the present invention can obtain the following effects.

According to the winding for static induction equipment of claim 1,
Since the conductor itself constitutes the heat pipe, the size of the entire winding can be reduced, the temperature gradient can be reduced, and the cooling efficiency can be improved and the thermal deterioration can be reduced.

According to the stationary induction device winding of claim 2,
Since the hollow radiator is connected to the hollow conductor via the hollow connector made of an electrical insulating material, in addition to the same effects as the above, the voltage used for the winding is high. Even when there is a concern about insulation of the heat radiator, it can be sufficiently used.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a main part showing a first embodiment of the present invention.

FIG. 2 is a partial perspective view.

[Fig. 3] Configuration diagram of winding part

FIG. 4 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a winding showing a conventional example

FIG. 6 is a diagram showing an initial potential distribution.

[Explanation of symbols]

1 is an interleaved winding (winding for static induction equipment), 51
Is a heat radiating portion, 52 is a heat receiving portion, 53 is a heat radiating body, 54 is a connecting body, a is a first conductor, and b is a second conductor.

Claims (2)

[Claims] 1. A static induction device, wherein at least one of the conductors wound in parallel is formed in a hollow shape, and a cooling medium is enclosed in the hollow conductor to form a heat pipe. Winding. 2. At least one of the conductors wound in parallel is formed in a hollow shape, and a hollow radiator is connected to the hollow conductor via a hollow connector made of an electrically insulating material, A winding for a static induction device, characterized in that a cooling medium is enclosed in the hollow conductor and the radiator to form a heat pipe.