JPH0677062A - Stationary induction electrical equipment - Google Patents

Abstract

PURPOSE:To reduce an insulation distance to an irreducible minimum so as to enable a winding to be lessened in size as a whole, improved in mechanical strength, and less oscillated in operation by a method wherein a flexible insulator is mounted at least on a winding, a spacer, or a duct rail coming into close contact with it. CONSTITUTION:Duct rails 2 and 4 are fixed to the outer circumference of a base insulating cylinder 1 located inside windings arranged surrounding an iron core and the inner circumference of a base insulating cylinder 3 located outside the windings respectively along the axial direction of the cylinders. A conductor 6 coated with an insulator 7 is wound on to form windings. A flexible insulator 9 is provided to the corner of the conductor 6 inside the windings section by section or by sections. By this setup, a gap between a conductor and a rail or spacers is filled with insulator, so that windings can be enhanced in reliability and mechanical strength, and consequently a stationary induction electrical equipment lessened in oscillation and noises can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static induction electric device such as a transformer, and more particularly to a static induction electric device capable of improving the dielectric strength and mechanical strength of windings and reducing noise.

[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 the figure, a duct rail 2 fixed axially to the outer peripheral side of a basic insulating cylinder 1 arranged inside a winding 8 arranged around an iron core (not shown), and The winding 8 is provided between the duct 8 and the duct rail 4 arranged along the axial direction on the inner peripheral side of the basic insulating cylinder 3 arranged outside the winding 8. The winding 8 is formed by winding a conductor 6 covered with an insulator 7 made of insulating paper, an insulating film or an insulating coating around an iron core. A spacer 5 is inserted between the winding layers of the winding 8 so that the right end and the left end in the drawing are groove-engaged with the duct rails 2 and 4. The conductor 6 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 held by the spacers 5 equally arranged in the circumferential direction. The winding is housed in a tank (not shown) together with a liquid or gas such as oil or SF ₆ gas, or a solid insulating medium.

The static induction electric device winding 8 having the above-mentioned structure is provided between the rail 2, the conductor insulator 7 and the spacer 5.
Alternatively, a minute gap G or a wedge-shaped gap G is formed between the insulator 7 and the spacer 5 so that the gap length continuously changes. An insulating medium such as oil or insulating gas exists in such a gap G. Generally, the relative permittivity of the insulating medium is that of the solid insulator such as the rail 2, the spacer 5, or the insulator 7 around the conductor. Since it is smaller than that of the electric field, the electric field is concentrated in the gap G part of the insulating medium having a small relative permittivity, and a high electric field is generated, which causes dielectric breakdown, resulting in poor insulation reliability. It was necessary to increase the insulation distance between the parts, which led to an increase in the size of the device.

In order to prevent this, a method of filling the gap G with a flexible insulator 9 is adopted. But,
The winding 8 is often wound from the inner side to the outer side, and inside the winding, a flexible wire is provided in the gap G formed by the inner rail 2, the spacer 5 and the conductor insulator 7 so as to cover the winding. The insulating material 9 having the property of filling the gap G fills the gap G, while the outer side of the winding 8 has a winding 8 for mounting the outer rail 4 and the outer insulating tube 3 after the winding is manufactured.
Since there is a margin between the outer rail 4 and the outer rail 4, even if a flexible insulator 9 is arranged on the winding 8 side, the winding 8
And a gap S is generated.

As described above, the insulator 9 having flexibility
Although the method of filling the gap G by using to improve the dielectric strength is effective on the inside of the winding, the winding G does not act on the inside of the winding because the winding force does not act directly on the outside of the winding. Could not be filled, and a gap S was generated, resulting in a structure with poor insulation reliability.

Further, there is a drawback that the insulating material shrinks on the outside of the winding wire 8 due to drying of the insulating material and withering due to long-term operation, causing backlash in the winding wire 8 and increased vibration and noise. It has also been a cause of reduction in mechanical strength such as tightening force and short-circuit mechanical force.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art, and its purpose is to improve the insulation reliability of the winding to minimize the insulation distance and to reduce the entire winding. It is an object of the present invention to provide a low-noise static induction electrical device that reduces the size of the coil, enhances the mechanical strength of the winding, and absorbs the vibration during energization.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to claim 1 in which a conductor is wound around a duct rail, a spacer, etc. around a basic insulating cylinder arranged around an iron core. In a static induction electric device that forms a winding and uses a flexible insulator as a part of the constituent insulator, a flexible insulator is used as at least one of the winding or spacer or duct rail. It is characterized in that a flexible insulator is brought into close contact with the winding by mounting. Further, in claim 2, the flexible insulator is a GORE-TEX seal material, crepe paper, elastomer material,
It is characterized by being silicon rubber.

[0010]

According to the static induction electric equipment of the present invention, the insulating material having flexibility is crushed by the tightening force at the time of winding the winding, and a wedge-shaped gap is formed between the insulating material and the insulating material. Does not occur, the insulation reliability of the winding is enhanced, and vibration of the winding is absorbed to increase mechanical strength.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a sectional view of the first embodiment of the present invention. In addition,
The same parts as those of the conventional example described above are designated by the same reference numerals for description. In the figure, the outer peripheral side of the basic insulating cylinder 1 located around the iron core and located inside the winding and the inner peripheral side of the basic insulating cylinder 3 located outside the winding along the axial direction, respectively. The duct rails 2 and 4 are fixed to each other and the conductor 6 covered with the insulator 7 is wound to form a winding. At this time, the duct rail 2 is groove-engaged between the winding layers. The spacer 5 is inserted. The conductor 6 is wound around the duct rail 2 from the inside to the outside by a strong tightening force. Further, the spacer 5 is partially arranged in the circumferential direction,
The gap between the sections is maintained, and the sections are clamped in the vertical direction so that the winding does not rattle or shift.

Inside the winding, a flexible insulator 9 is attached to each corner of the conductor 6 in each section or in a plurality of sections. On the outside of the winding, as shown in FIG. 2, a flexible insulator 10 is attached to the conductor 6 as a padding, and a flexible insulator 9 is attached so as to cover the conductor 6 from above. The insulators 9 and 10 having such flexibility may be configured for each section or a plurality of sections may be collectively attached. In addition, these flexible insulators 9 and 10 may extend over the entire circumference in the winding circumferential direction or may be partially used in the circumferential direction.

According to the winding structure of the present embodiment, the flexibility provided so as to be sandwiched between the inner rail 2, the spacer 5 and the conductor 6 on the inner side of the winding by the tightening force of the winding during manufacturing. Since the insulating material 9 has been crushed and completely adheres to the conductor 6, the inner rail 2, the spacer 5, and the conductor 6 are formed as in the conventional case.
It does not have a wedge-shaped minute gap between and. Therefore, when the insulating medium such as oil or SF ₆ gas is filled, the wedge-shaped gap G, which is a weak point in the insulation, is not formed, so that the electric field is not concentrated around the conductor and the insulation reliability is improved. Is greatly improved.

Further, by using the flexible insulator itself as a material having a dielectric constant lower than that of the basic insulating cylinder, a minute gap is formed between the conductor 6 and the flexible insulator 9. Also reduces the electric field in the gap and improves the insulation reliability.

Further, because of the flexible insulator, the conductor is effectively compressed and closely adhered to the inner rail 2 by a radial force for winding the rail or an axial force for vertically tightening the winding. In addition, since the conductor 6 is effectively adhered to the outer rail 4, the entire winding is firmly fixed by the winding structural material. Therefore, winding backlash does not occur even when the insulation shrinks or withers due to the winding drying process or long-term operation, so that the mechanical strength is improved without lowering the winding tightening strength. .
In addition, since it also absorbs vibrations during energization, it also has the effect of reducing vibrations and eventually noise.

In this embodiment, the flexible insulator 10 further inserted between the outer rail 4, the conductor 6 and the flexible insulator 9 is attached to the entire outer circumference of the outer winding. Of course, you may attach only to the part which contacts the winding outer side rail 4. Further, in order to attach the flexible insulator 9 to the conductor 6, the string may be temporarily fixed with a string or the like and then assembled, or the string may be removed, or may be fixed with an adhesive or the like. Further, the combination of the flexible insulator 10 and the flexible insulator 9 covering the flexible insulator 10 may be attached only to a part of the winding such as being attached to each section, for example, a section only near the line end.

The flexible insulator 10 to be mounted on the conductor 6 may be a laminate of conventional pressboards or the like, or may be a laminate of the insulators, or the periphery of the conductor 6. It may be attached to only a part of. The shape of the insulator is not limited to the shape matched with the conductor 6, but may be any shape as long as it is in close contact with the conductor 6 by the tightening force of the winding when the winding is assembled. Also, the conductor 6
A flexible insulating material 10 may be formed by winding a tape-shaped insulating material such as crepe paper. By using a conventionally used insulator such as crepe paper as a flexible insulator, it can be easily manufactured and the product performance can be improved. Furthermore, the tape-shaped insulator may be wound around the entire conductor 6.

In addition, the insulating material having flexibility not only adheres and fixes between the conductor inside the winding and the inner rail by the tightening force when the winding is wound, but also the conductor outside the winding. The mechanical strength is improved by closely contacting and fixing the outer rails. Furthermore, since vibrations during energization are also absorbed, there is an effect of reducing vibrations, and by extension, noises.

FIG. 3 is a sectional view of the second embodiment of the present invention. In the figure, the outer peripheral side of the basic insulating cylinder 1 located around the iron core and located inside the winding and the inner peripheral side of the basic insulating cylinder 3 located outside the winding along the axial direction, respectively. Then, the duct rails 2 and 4 are fixed, and the conductor 6 covered with the insulator 7 is wound to form a winding. At this time, the spacer 5 is inserted between the winding layers by groove engagement with the duct rail 2. The conductor 6 is wound around the rail 2 from the inside to the outside by a strong tightening force. Spacer 5
Are partially arranged in the circumferential direction, the gap between the sections is maintained, and the sections are tightened from the upper and lower sides so that the winding does not rattle or shift. In addition, a flexible insulator 9 is attached to each corner of the conductor 6 for each section or for a plurality of sections. These flexible insulators 9 may be used all around the winding circumferential direction or partially in the circumferential direction.

Further, in this embodiment, as shown in FIG. 4, a part of the flexible insulator 11 is attached to the spacer 5 so as to cover the outside of the winding 8. With this structure, the flexible insulator 9 that is sandwiched between the inner rail 2, the spacer 5 and the conductor 6 is crushed inside the winding due to the tightening force of the winding during manufacturing,
Completely adhere to the conductor 6. Spacer 5 outside the winding
A flexible insulator 11 attached to the conductor 6
The flexible insulator 9 attached to the completely adheres to the conductor 6, and is formed by the conductor 6 on the outer side of the winding, the flexible insulator 9 and the outer rail 4 of the winding, which have occurred in the conventional configuration. The gap S is filled, and the flexible insulator 9 completely adheres to the conductor 6. Therefore, the conductor 6 closely adheres to the insulating material 9 which is completely flexible inside and outside the winding, and when filled with an insulating medium such as oil or SF ₆ gas, a wedge-shaped gap, which is a weak point in insulation, is generated. Since it is not formed, the electric field is not concentrated around the conductor, and the insulation reliability is significantly improved.

As another example of the flexible insulator attached to the spacer, as shown in FIG. 5, a flexible insulator 12 may be attached vertically to the spacer 5. By doing so, the flexible insulator 12 attached to the spacer 5 completely adheres the flexible insulator 9 attached to the conductor 6 outside the winding to the conductor 6 by the winding outer rail 4. Therefore,
The gap S formed by the conductor 6, the flexible insulator 9 and the outer rail 4 is filled, the electric field is not concentrated around the conductor 6, and the insulation reliability is improved.

FIG. 6 is a cross-sectional view of the third embodiment of the present invention. The difference of the present embodiment from the second embodiment is only the structure of an insulator having flexibility to be attached to a spacer, and other points. Since the configurations are the same, the same reference numerals are given to the same portions and the description thereof will be omitted.

In this embodiment, the spacer 5 located above the winding 8 has an L-shaped flexible insulator 13 on the lower surface thereof as shown in FIG.
To cover. Further, an L-shaped flexible insulator 14 is attached to the upper surface of the spacer 5 located below the winding 8 so as to cover the outer conductor 6 of the winding 8. Therefore, the flexible insulator 9 attached so as to cover the conductor 6 on the outside of the winding is completely adhered to the conductor 6 by the flexible insulators 13 and 14 attached to the upper and lower spacers 5 and 5, Since no gap, which is a weak point in insulation, is formed, the electric field is not concentrated around the conductor, and the insulation reliability is significantly improved.

FIG. 8 is a cross-sectional view of the fourth embodiment of the present invention. The difference of this embodiment from the second embodiment is only the structure of an insulator having flexibility to be attached to a spacer, and other points. Since the configurations are the same, the same reference numerals are given to the same portions and the description thereof will be omitted.

In the present embodiment, as shown in FIG. 9, an L-shaped flexible insulator 15 is attached to the lower surface of the spacer 5 located above the winding 8 to form the entire outer conductor 6 of the winding 8. Attach to cover. Further, an L-shaped flexible insulator 16 is attached to the upper surface of the spacer 5 located below the winding 8 so as to cover the entire outer conductor 6 of the winding 8. Insulators 15 and 1 having such flexibility
By providing 6, the flexible insulator 9 attached to the winding and the flexible insulators 15 and 16 between the conductor 6 on the outside of the winding and the outer rail 4 are compressed, so that these flexible Insulators 9, 15 and 16 that have the property are completely adhered to the conductor 6 and a gap which is a weak point in the insulation is not formed. Therefore, the electric field is not concentrated around the conductor, and the insulation reliability is significantly improved. To do.

FIG. 10 is a cross-sectional view of the fifth embodiment of the present invention. The difference of this embodiment from the fourth embodiment is only that the flexible insulator is attached to the outer rail instead of the spacer. Since the other configurations are the same, the same reference numerals are given to the same portions and the description thereof will be omitted.

In this embodiment, as shown in FIG. 11, a flexible insulator 17 is attached to the outer rail 4. According to this structure, the flexible insulator 9 attached to the conductor 6 outside the winding is pressed against the conductor 6 by being clamped by the flexible insulator 17 attached to the outer rail 4 when the winding is formed. Since the insulator 9 having flexibility is in close contact with the conductor, no gap is formed and the electric field is not concentrated around the conductor. Therefore, the insulation reliability is significantly improved.

Further, by using the flexible insulator itself as a material having a dielectric constant lower than that of the basic insulating cylinder 3, a minute gap is formed between the conductor 6 and the flexible insulator 9. Even so, the electric field in the gap is reduced, and the insulation reliability is further improved.

Further, because of the flexible insulator 17, the conductor 6 is effectively compressed and closely adhered to the inner rail 2 by a radial force for winding the rail or an axial force for vertically tightening the winding. Since the conductor 6 is effectively adhered to the outer rail 4 as well, the entire winding is firmly fixed to the winding structure material. Therefore, winding backlash does not occur even when the insulation shrinks or withers due to the winding drying process or long-term operation.Therefore, the winding tightening strength does not decrease and the mechanical strength is improved. Moreover, since it also absorbs vibrations during energization, it also has the effect of reducing vibrations and, in turn, noise.

By the way, in each of the above embodiments, the flexible insulator (11 to 17) attached to the spacer 5 is used.
May be attached to the entire outer circumference of the outer winding, and the outer rail 4
You may attach only to the part which contacts. Further, in order to attach the flexible insulators (11 to 17) to the spacer 5, the string may be temporarily fixed with a string or the like and assembled, and then the string may be removed or fixed with an adhesive or the like. Further, the combination of the flexible insulators (11 to 17) and the flexible insulator 9 covering the winding 8 may be attached to each section, or for example, to a section only near the line end. For example, only a part of the winding may be attached. In addition, the flexible insulators (11 to 17) attached to the spacers 5 may be the ones obtained by stacking or pasting the conventional insulators such as press boards, or only on a part of the periphery of the spacers 5. May be attached. Further, the shape of the insulator is not limited to the shape matched with the spacer 5, and the flexible insulator 9 attached to the conductor 6 is attached to the conductor 6 by the tightening force of the winding when the winding is assembled. Any shape may be used as long as they are in close contact.

Furthermore, not only is the flexible insulator closely contacting and fixing the conductor inside the winding and the rail by the tightening force when the winding is wound, but also the conductor outside the winding and the rail. The mechanical strength is improved by tightly adhering and fixing between the two, and vibrations during energization are also absorbed, reducing vibrations.
As a result, it also has the effect of reducing noise.

[0032]

As described above, according to the present invention, the flexible insulator is provided between the rail, the spacer and the conductor, and the flexible insulator is closely adhered to the conductor especially on the outer side of the winding. With this configuration, the gap between the conductor, the rail, and the spacer is filled, the insulation reliability of the winding is increased, the mechanical strength is increased, and the static induction electric device with reduced vibration and noise can be provided.

[Brief description of drawings]

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

FIG. 2 is a perspective view of a conductor to which the flexible insulator of FIG. 1 is attached.

FIG. 3 is a sectional view of a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of the spacer having the flexible insulator of FIG. 3 attached thereto.

FIG. 5 is a perspective view of a spacer to which a flexible insulator according to the present invention is attached.

FIG. 6 is a sectional view of a third embodiment of the present invention.

FIG. 7 is a cross-sectional view of a spacer to which the flexible insulator of FIG. 6 is attached.

FIG. 8 is a sectional view of a fourth embodiment of the present invention.

9 is a cross-sectional view of the spacer having the flexible insulator of FIG. 8 attached thereto.

FIG. 10 is a sectional view of a fifth embodiment of the present invention.

FIG. 11 is a perspective view of the outer rail having the flexible insulator of FIG. 10 attached thereto.

FIG. 12 is a cross-sectional view of a conventional winding portion.

[Explanation of symbols]

1 ... Winding inner basic insulating cylinder, 2 ... Inner rail, 3 ... Winding outer basic insulating cylinder, 4 ... Outer rail, 5 ... Spacer, 6 ... Conductor, 7 ... Insulator, 8 ... Winding, 9, 10, 11, 12, 1
3, 14, 15, 16, 17 ... Flexible insulator,
G ... Gap, S ... Gap.

Claims (2)

[Claims] 1. A winding is formed by winding a conductor around a duct rail, a spacer, etc. around a basic insulating cylinder arranged around an iron core, and a flexible insulating material is used as a part of the constituent insulating material. In the static induction electric device, the flexible insulating material is attached to at least one of the windings or the spacers or the rails for ducts so that the flexible insulating material is closely attached to the winding. A stationary induction electric device characterized by the above. 2. The static induction electric device according to claim 1, wherein the flexible insulator is a GORE-TEX sealing material, crepe paper, elastomer material, or silicone rubber.