JPH0631129U - Static induction machine - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the series capacitance added to the winding of a static induction machine to improve lightning resistance and enable miniaturization. A static induction machine equipped with an inter-shield winding in which a main circuit electric wire 1 is divided into a plurality of parallel wires 1a and 1b, and a shield wire 2 is wound at least between the parallel wires 1a and 1b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a static induction machine such as a transformer or a reactor, and more particularly to a structure in which the potential distribution of a winding is improved with respect to the lightning impulse voltage.

[0002]

[Prior art]

 Conventional windings for static induction machines such as transformers and reactors include those shown in FIG. This is because the shield wire 2 is wound around the main circuit wire 1 in order to improve the potential distribution in the winding when a voltage waveform with a steep wave front such as lightning surge or lightning impulse is applied to the winding. Inter-shield winding method.

Since the main circuit wire 1 is used when the winding current is large, winding work becomes difficult if a copper wire that is too thick is used in this case, and the eddy current increases, so several copper wires are used. It is configured by dividing it into parallel strands of. For this reason, in this conventional example, the first strand 1a and the second strand 1b are divided into two parts. The parallel strands 1a and 1b are configured so that the electric current flows uniformly by the dislocation and the eddy current loss is reduced.

Also, regarding the initial potential distribution when a shock voltage having a steep wave front such as lightning enters the winding, it is known that the voltage concentrates on the winding near the line terminal. Therefore, it has an inter-shield winding type lightning protection winding structure in which the shield wire 2 is wound up to the second turn of the main circuit wire 1 near the wire terminal of the winding.

In the lightning-proof winding structure as described above, the series capacitance ΔK ₁ added between two coils is given by the following equation per turn.

ΔK ₁ = 1 / 2C _t · V ₁ ² Here, C _t represents the electrostatic capacity for one turn (between the main circuit wire and the shield wire). Further, V ₁ is a shared voltage for one turn, that is, a shared voltage for one coil (the shared voltage for the shield wire and the main circuit electric wire is for one coil).

[0007]

[Problems to be solved by the device]

In the conventional static induction machine as described above, the larger the series capacitance added by the configuration of the inter-shield winding method, the greater the effect of improving the potential distribution in the winding. However, the inter-shield winding method has a problem that a large improvement effect cannot be expected because the shared voltage V ₁ between turns is small.

Further, if the number of times the shield wire 2 is wound around the main circuit electric wire 1 of the winding can be increased, the series capacitance to be added can be increased. However, as many shield wires 2 are wound as possible. There was a problem that the entire winding became large and the space factor deteriorated. Furthermore, the potential difference between each turn of the main circuit wire 1 after the second turn gradually decreases. Therefore, the series capacitance added as the number of windings of the shielded wire 2 around the main circuit electric wire 1 becomes smaller than that in the first turn, which is not only inefficient but also makes the entire winding larger and larger. There was a problem.

In view of the above points, the present invention increases the series capacitance added to the winding, and when a voltage waveform having a steep wave front such as lightning impulse is applied, the potential distribution in the winding is increased. It is an object of the present invention to provide a new static induction machine that can achieve a large improvement effect, has a good space factor for the entire winding, and can downsize the entire winding.

[0010]

[Means for Solving the Problems]

 In the static induction machine of the present invention, the main circuit wire of the winding used for this is divided into a plurality of parallel strands, and at least a shield wire is wound between the parallel strands to form an winding. It is characterized by the shield winding method.

[0011]

[Action]

 By configuring as described above, the series capacitance between the parallel strands and the shield wire near the line terminal of the winding is increased. This increases the series capacitance added to the winding, improves the potential distribution in the winding when a voltage waveform with a steep wave front such as lightning surge or lightning impulse is applied, and Improves insulation strength.

[0012]

【Example】

 An embodiment of the static induction machine of the present invention will be described below with reference to FIG. In FIG. 1, the parts corresponding to those of the conventional example shown in FIG. 2 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1 showing a schematic configuration of windings in the static induction machine of this example, 1 is a main circuit wire and 2 is a shield wire.

The main circuit electric wire 1 is configured by dividing a conducting wire into two parallel wires, a first wire 1 a and a second wire 2 a. The main circuit electric wire 1 may be divided into three or more parallel windings.

In the winding of this example, the shielded wire 2 for improving the potential distribution is wound between the first wire 1a and the second wire 1b. Further, the shield wire 2 is wound in the first turn of the main circuit wire 1 to form the structure as shown in FIG.

By configuring as described above, it is possible to increase the series capacitance between the first wire 1a and the second wire 1b in the main circuit wire 1.

Therefore, when the series capacitance to be added to the winding is increased and a voltage waveform having a steep wave front such as lightning sircy or lightning impulse is added, the potential distribution in the winding is improved and the impact is improved. The insulation strength against voltage can be improved.

Further, in the above-mentioned embodiment, the case where the shield wire 2 is wound around the first turn of the main circuit electric wire 1 is also shown. However, when the main circuit electric wire 1 is composed of three or more parallel strands, the shield wire 2 may be wound only between them.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0020]

[Effect of device]

 As described above in detail, according to the static induction machine of the present invention, the main circuit wire of the winding used for this is divided into a plurality of parallel wires, and at least a shield wire is wound between the parallel wires. Since the inter-shield winding method is configured by turning, the series capacitance between the parallel wire and the shield wire near the wire terminal of the winding is increased. This increases the series capacitance added to the winding, improves the potential distribution in the winding when a voltage waveform with a steep wave front such as lightning surge or lightning impulse is applied, and the impact is improved. This has the effect of improving the insulation strength against voltage. Furthermore, a static induction machine using such a winding has the effect of improving characteristics such as lightning resistance and improving the reliability of the machine. In addition, since the shield wire is placed near the more efficient line terminal in the main circuit wire, and the shield wire is not wound much, it is possible to downsize the winding wire and the entire equipment using it. effective. In addition, the winding of the present invention has the effect that it can be used for higher voltage windings as compared with the conventional inter-shield winding using the same amount of shielded wire.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a main part configuration of a winding part showing an embodiment of a static induction machine of the present invention.

FIG. 2 is an explanatory diagram of a main part configuration illustrating a winding part of a conventional static induction machine.

[Explanation of symbols]

 1 ... Main circuit electric wire 1a ... 1st element wire 1b ... 2nd element wire 2 ... Shield wire

Claims (1)

[Scope of utility model registration request] 1. A static induction machine having a winding obtained by dividing a main circuit electric wire into a plurality of parallel strands, wherein at least the winding is shielded between the parallel strands to form an inter-shield winding system. A static induction machine characterized by being configured.