JPH07183139A - Static induction electrical apparatus - Google Patents

Abstract

PURPOSE:To constitute a static induction electrical apparatus in such a structure that insulator foreign materials are prevented from being discharged from the end parts of spacers and blocking plugs to improve the insulation reliability of a winding as well as to enhance the mechanical strength of the electrical apparatus. CONSTITUTION:Rails for duct formation are respectively fixed on the outer peripheral side of a foundation insulating cylinder 1, which is arranged on the periphery of a core and is positioned on the inner side to a winding, and on the inner peripheral side of a foundation insulating cylinder 2, which is positioned on the outer side to the winding, along the axial directions of the cylinders 1 and 2 and a conductor covered with an insulator is wound to constitute the winding 3. At this time, spacers 5, which are engaged with grooves bored in the rails and respectively has an axis length in the diametral directions of the cylinders, are inserted in between wound layers to constitute the winding. The spacers 5 are constituted so that they are partially arranged in the peripheral directions of the cylinders, a gap is held between the sections of the winding and the spacers 5 are clamped from the vertical directions. Moreover, outside blocking plugs 6 and inside blocking plugs 7 are respectively arranged on the outside of the winding 3 and on the inside of the winding 3 in every several sections. An insulator coating is performed on the spacers 5 and the plugs 6 and 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static induction machine such as a transformer, and more particularly to a static induction machine having a winding wound with an insulating spacer.

[0002]

2. Description of the Related Art In static induction electric equipment, the greatest technical problem in applying to higher voltage and larger capacity depends on how high dielectric strength can be given to the equipment or improvement in mechanical strength. There is.

An example of a conventional static induction electric device will be described below with reference to FIG. As shown in FIG.
A duct forming rail (not shown) axially fixed to the outer peripheral side of the inner insulating cylinder 1 arranged inside the winding wound around the winding, and outside the winding. On the duct forming rail (not shown) arranged along the axial direction on the inner peripheral side of the outer insulating cylinder 2 arranged at, a conductor covered with an insulating paper, an insulating film, or an insulating material such as an insulating coating is wound. The winding 3 is formed by turning. Its winding 3
A spacer 5 having groove-engaging right and left ends in the drawing formed in a duct forming rail (not shown) is inserted between the winding layers. The conductor is wound from the outer side to the inner side or from the inner side to the outer side to form each section, and the gap between the sections is configured to be held by the spacers 5 equally arranged in the circumferential direction. The winding is stored in a tank together with a liquid or gas such as oil or SF ₆ gas, or a solid insulating medium, and this insulating medium also plays a role of cooling the winding by flowing between the sections of the winding. In order to improve the cooling efficiency, the winding 3 is provided with an outer blocking plug 6 outside the winding 3 and an inner blocking plug 7 inside the winding 3 for every several sections. The blocking plugs 6 and 7 hinder the smooth flow of the insulating medium and contribute to the improvement of cooling efficiency. The closing plugs 6 and 7 are also spacers made of an insulating material. Further, a minute gap G is formed between the spacer 5, the inner blocking plug 6, the outer blocking plug 7 and the inner insulating cylinder 1 and the outer insulating cylinder 2 attached to the winding. An insulating medium such as oil or insulating gas exists between the gaps G. Generally, the relative permittivity of the insulating medium is that of an insulating cylinder, rail, spacer, plug or solid insulator around the conductor. Since the electric field is smaller than the dielectric constant, the electric field is concentrated in the gap G portion of the insulating medium having a small relative permittivity to form a high electric field, and the insulating medium flows and flows into the gap G portion for cooling. Foreign matter of the insulator is easily released from the ends of the closure plugs 6, 7, and the foreign matter becomes a high electric field and causes dielectric breakdown. Therefore, insulation reliability is poor, and the distance between sections and each portion between windings are small. It was necessary to increase the insulation distance of the device, which led to an increase in the size of the device. Further, on the outer side of the winding 3, there is a drawback that the insulating material shrinks due to drying of the insulating material or withering due to long-term operation, causing backlash in the winding and increasing vibration and noise. Further, it has also been a cause of reduction in mechanical strength such as tightening force and short-circuit mechanical force.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and its purpose is to improve the insulation reliability of the winding structure to reduce the entire winding structure. Another object of the present invention is to provide a low-noise static induction electric device in which the mechanical strength of the winding structure is increased.

[0005]

According to the present invention, in a hermetically sealed container in which an insulating refrigerant is sealed, double insulating cylinders are concentrically arranged around the iron core, and the insulating cylinders are surrounded by the insulating cylinder. The conductor is wound so that a plurality of insulating spacers are appropriately inserted in the axial direction of the insulating cylinder so as to be inserted in the radial direction, and the insulating spacer is wound between the inner insulating cylinder and the winding, and the outer side. In a static induction electric device having a width length protruding into the space between the insulating cylinder and the winding, it is preferable that an end of the insulating spacer facing the both insulating cylinders is coated with an insulating polymer material. Characterize.

[0006]

With the above structure, foreign matter is prevented from being discharged from the end portion of the insulating spacer, so that the insulation reliability of the winding can be improved. Also, with the improvement of mechanical strength, vibration,
Noise can also be reduced.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the same parts as those of the conventional example described above are designated by the same reference numerals. FIG. 1 is a sectional view of the first embodiment of the present invention. In the figure, on the outer peripheral side of the basic insulating cylinder 1 located around the iron core (not shown) and located inside the winding, and on the inner peripheral side of the basic insulating cylinder 2 located outside of the winding. A duct forming rail (not shown) is fixed along each axial direction, and a conductor covered with an insulator is wound to form the winding 3. At this time, a winding is constructed by inserting a spacer 5 having a shaft length in the radial direction of the insulating cylinder into groove engagement with a duct forming rail between each winding layer.

The conductor is wound on the rail from the inside to the outside by a strong tightening force. Further, the spacer 5 is also partially arranged in the circumferential direction so as to maintain a gap between the sections and to be tightened in the vertical direction so that the winding 3 is not loosened or displaced. In order to improve the cooling efficiency, the winding 3 is provided with an outer blocking plug 6 outside the winding 3 and an inner blocking plug 7 inside the winding 3 for every several sections.

In the static induction electric apparatus of this embodiment having the above-mentioned structure, the spacer 5 and the obstruction plugs 6 and 7 are provided with
It is constructed by applying an insulating coating as shown in.
In the figure, the spacer 5 or the end portions of the blocking plugs 6 and 7 are coated with an insulating material, but the coating may be applied only to the end portions of the spacer or the blocking plug, or may be applied to the entire portion. The coated spacers 5 and the closure plugs 6 and 7 may be attached to one section or a plurality of sections. Further, the spacers 5 and the closure plugs 6 and 7 coated with these coatings may be used over the entire circumference in the circumferential direction of the winding wire 3 or partially in the circumferential direction. With this configuration, with respect to the closure plugs 6 and 7 arranged circumferentially on the winding, the insulating medium 4 has the gap G between the closure plugs 6 and 7 and the insulation cylinders 1 and 2.
When it passes through the plugs 6, it is released into the insulating medium 4 from the ends of the plugs 6 and 7, and a high electric field is generated in the gap G, so that the foreign matter of the insulating material, which is an electrically weak point, is suppressed. In addition, the release of foreign matter of the insulating material is also suppressed from the end portions of the spacers 5 which are partially arranged in the circumferential direction of the winding, and there is no foreign matter that concentrates the electric field in the insulating medium 4, resulting in a large insulation reliability. Improve to.

FIG. 3 is a sectional view of a spacer 5 or blocking plugs 6, 7 impregnated with an insulating material according to a second embodiment of the present invention. The insulating material may be impregnated into a part of the spacer 5 and the closure plugs 6 and 7, or may be applied to the whole. With such a configuration, similarly, the release of foreign matter from the ends of the spacer 5 and the closure plugs 6 and 7 is suppressed, and the insulation reliability is improved.

Further, by impregnating the spacer 5, the closure plugs 6, 7 and the like with a polymer or the like of an insulating material, it is possible to prevent the insulating material from withering or shrinking due to drying, thereby improving the mechanical strength. Therefore, the windings that are fixed by the radial force that winds around the rail or the axial force that tightens in the vertical direction can be wound even when the insulation shrinks or withers due to the drying process of the winding or long-term operation. There is no backlash, and the entire winding is firmly fixed to the winding structure material, and the mechanical strength is improved. In addition, since it also absorbs vibrations during energization, it also has the effect of reducing vibrations and eventually noise.

FIG. 4 is a cross-sectional view of a spacer 5 or blocking plugs 6 and 7 whose ends are bent according to a third embodiment of the present invention. The end may be bent at an angle or more at which the foreign matter of the insulator is not discharged from the end due to the insulating medium flowing through the gap G between the spacer 5 or the blocking plugs 6 and 7 and the insulating cylinders 1 and 2. It may be bent 180 ° as shown in FIG. 4, or may be bent about 20 ° in the upper direction so that the end face is not directly exposed in the flow direction of the insulating medium 4. The spacer 5 and the closing plugs 6 and 7 whose end faces are bent may be attached to one section or a plurality of sections. In addition, the spacers 5 having these ends bent and the closure plugs 6, 7
May be used all around the circumference of the winding 3 or partially in the circumference. With this configuration, with respect to the closure plugs 6 and 7 arranged circumferentially on the winding,
When the insulating medium 4 passes through the gap G between the closing plugs 6 and 7 and the insulating cylinders 1 and 2, foreign matter of an insulator is discharged into the insulating medium 4 from the ends of the closing plugs 6 and 7, and the gap G is high. Although it became an electric field and became an electrical weak point, since the ends of the closure plugs 6 and 7 are bent upward and are not directly exposed to the flow of the insulating medium 4, the release of foreign matter of the insulating material is suppressed, Insulation reliability is greatly improved. Similarly, the emission of foreign matters from the insulator is suppressed also from the ends of the spacers 5 which are partially arranged in the circumferential direction, the electric field concentration of the foreign matters in the gap G is relaxed, and the insulation reliability is greatly improved.

FIG. 5 is an assembled sectional view when the end portion of the outer block plug 6 of the third embodiment shown in FIG. 4 is bent 90 °.
Since the ends of the outer blocking plug 6 do not face each other in the flow direction of the insulating medium 4, the release of foreign matter from the ends is suppressed, and the insulation reliability is improved. Further, the blocking plugs 6 and 7 have a function of suppressing the flow of the insulating medium 4 and effectively flowing into the winding 3, but also have a function of mechanical strength to withstand the force due to the flow of the insulating medium 4. . By bending the ends of the plate-like closure plugs 6 and 7, the mechanical strength is improved, and since the vibrations at the time of energization are also absorbed, the vibrations can be reduced and the noise can be reduced.

Further, the end portions of the closure plugs 6 and 7 may be bent by about 20 ° so that the end portions contact the insulating cylinders 1 and 2. With such a configuration, not only the insulation reliability and the mechanical strength are improved, but also the insulating medium 4 has the gap G.
By suppressing the inflow into the winding 3, the insulating medium 4 effectively flows into the winding 3 and the cooling efficiency is improved.

FIG. 6 is a sectional view of an outer block plug 6 to which a flexible insulator 15 is attached according to a fifth embodiment of the present invention. The flexible insulator 15 may be attached to either or both of the outer blocking plug 6 and the inner blocking plug 7, or may be mounted in the entire circumferential direction, or may be mounted only in a portion where the electric field is large. . In this way, by attaching the flexible insulator 15 around the outer periphery of the end of the outer block plug 6 and pressing it against the outer insulating tube 2, the end of the outer block plug 6 is not directly exposed to the insulating medium, and insulation is achieved. The release of foreign matter of the insulator into the medium 4 is suppressed, and the insulation reliability is improved.

Further, since the flexible insulator 15 is adhered and fixed to the outer insulating cylinder 2 by a strong winding force, a gap G may be formed between the outer plug 6 and the outer insulating cylinder 2. Insulation reliability and mechanical strength are improved,
Since it also absorbs vibrations when energized, it also has the effect of reducing vibrations and, in turn, noise. In addition, a flexible insulator 15
However, by suppressing the insulating medium 4 flowing from the gap G, the insulating medium 4 can effectively flow into the winding 3 and the cooling efficiency can be improved.

FIG. 7 is a sectional view showing a sixth embodiment of the present invention in which a flexible insulator 15 is attached to the winding 3 side of the outer insulating cylinder 2. The flexible insulator 15 may be attached to either or both of the outer insulating cylinder 2 and the inner insulating cylinder 1, or may be mounted in the entire circumferential direction, or may be mounted only in a portion where the electric field is large. .

As described above, by attaching the flexible insulator 15 to the inside of the outer insulating cylinder 2 and pressing it against the outer blocking plug 6 by the winding force, the end portion of the outer blocking plug 6 is directly made into an insulating medium. As a result, the release of foreign matter of the insulating material into the insulating medium 4 is suppressed, and the insulation reliability is improved.

Further, since the flexible insulator 15 is closely attached and fixed to the outer insulating cylinder 2 by a strong winding force, a gap G is formed between the outer blocking plug 6 and the outer insulating cylinder 2.
Does not occur, insulation reliability and mechanical strength are improved, and vibrations at the time of energization are also absorbed, so that vibrations can be reduced and noises can be reduced. Further, the insulating material 15 having flexibility suppresses the insulating medium 4 flowing from the gap G, so that the insulating medium 4 effectively flows into the winding 3 and the cooling efficiency is improved.

By the way, in the above-described sixth embodiment, the flexible insulator 15 is provided with the closing plugs 6, 7 or the insulating cylinders 1, 2.
In order to attach to, the string may be temporarily fixed with a string or the like and then assembled, and then the string may be removed or fixed with an adhesive or the like. Furthermore, the combination of the flexible insulator 15 and the closure plugs 6 and 7 or the insulating cylinders 1 and 2 may be attached to each section. May be attached only to. Further, the insulator 15 having flexibility may be a laminate or a laminate of conventional insulators such as a press board, the shape of which depends on the tightening force of the winding when the winding is assembled. Any shape may be used as long as it covers the blocking plugs 6 and 7 and does not expose the end portion to the insulating medium 4.

[0021]

As described above, according to the present invention, since the foreign matter of the insulating material is prevented from being discharged from the end portions of the spacer and the closure plug, the insulation reliability of the winding is improved and It is possible to provide a static induction electric device having increased mechanical strength and reduced vibration and noise.

[Brief description of drawings]

FIG. 1 is a sectional view according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of an insulating spacer coated with the insulating material of FIG.

FIG. 3 is a sectional view of an insulating spacer impregnated with an insulating material.

FIG. 4 is a sectional view of an insulating spacer having a bent end portion.

FIG. 5 is a sectional view according to a fourth embodiment of the present invention.

FIG. 6 is a sectional view according to a fifth embodiment of the present invention.

FIG. 7 is a sectional view according to a sixth embodiment of the present invention.

FIG. 8 is a cross-sectional view of a main part of a conventional winding constituent part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Inner insulating cylinder 2 ... Outer insulating cylinder 3 ... Winding 4 ... Insulating medium 5 ... Spacer 6 ... Outer closing plug 7 ... Inner closing plug 10 ... Insulator coating material 11 ... Insulator impregnated portion 15 ... Flexibility Insulating material G ... Gap

Claims (5)

[Claims] 1. A hermetically sealed container in which an insulating refrigerant is sealed,
Double insulating cylinders are concentrically arranged around the iron core, and conductors are wound between the insulating cylinders around the iron core, and insulating spacers are appropriately provided in the radial direction at intervals in the insulating cylinder axial direction. A plurality of coils are inserted and wound, and the insulating spacer has a width that protrudes between the inner insulating cylinder and the winding and between the outer insulating cylinder and the inter-winding space. A static induction electric device characterized in that a coating of an insulating polymer material is applied to opposite ends of both insulating cylinders. 2. The static induction machine according to claim 1, wherein the insulating spacers having a shape that suppresses the smooth flow of the insulating refrigerant are arranged at regular intervals in the axial direction of the insulating cylinder. 3. The static induction machine according to claim 1, wherein the end portion is impregnated with an insulating polymer material. 4. The static induction electric device according to claim 1, wherein the end portion is bent at least in an upper direction. 5. A flexible insulating member is closely disposed between the end portion and the inner insulating cylinder and the outer insulating cylinder so as to cover the outer periphery of the end portion. The stationary induction machine according to claim 2.