JPH05304738A - Slot insulation construction for electric equipment - Google Patents

Abstract

PURPOSE:To provide a slot insulation construction capable of lengthening a leak insulation distance of electric equipment. CONSTITUTION:The first insulation sheets 12, 12 are arranged almost in U-shape adjoining to the bottom and sidewall of a slot 11 of a core 10 and winding bodies 14 and 15 are arranged inside the first insulation sheets 12, 12, a layer-to- layer insulation 18 is interposed between the winding bodies, and the second insulation sheet 16 is bent to a reversed 'U' shape and inserted between the two first insulation sheets 12, 12 and also covers the winding bodies 14 and 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slot insulating structure for electric equipment, which is carried out when a winding is housed in an iron core groove (slot) of various rotary electric equipment.

[0002]

2. Description of the Related Art A winding of a rotary electric machine comprises a winding body using an insulated electric wire or an insulated conductor, and in the case of a multi-layer winding, the winding body is insulated from the core while being insulated. Then, the winding structure is formed by sequentially inserting the winding structure into the slots provided in.
It is well known that the electrical insulation of an electrical insulation is determined by the dielectric strength of the weakest point, no matter how sophisticated the insulation is. Therefore, in order to improve the overall insulation characteristic, there is no choice but to eliminate such a weak point.

The iron core having this winding structure is usually used in a grounded state via an iron stand or an outer box of a device. Therefore, a so-called ground potential is applied between the winding and the iron core. Therefore, the winding body needs to be inserted into the slot while being insulated from the slot. Conventionally, the slot insulation in this case is made into a substantially U-shape so that several insulating sheets 2, 2, ... Are contacted with the bottom and side walls of the slot 1 provided in the iron core 10, as shown in FIG. It is folded and arranged, and two layers of winding bodies 4 and 5 (in the case of two layers) are sequentially provided inside the insulating sheet, and an interlayer insulation 8 is provided between them.
And then insert the insulating sheet 2, 2 ...
Both upper end portions 3 and 6 are overlapped to form slot insulation. As the insulating sheets 2, 2, ..., Insulating paper, flexible mica, glass tape, polyester film or the like is used.

In such a winding structure, desired characteristics can be obtained by the material, size and shape of the insulating material itself as well as elimination of defects. However, as shown by the broken line in FIG. 5, the leakage insulation distance of the slot insulation is between a and b, and both end portions 3 of the insulation sheets 2, 2 ,.
There are only 6 mating parts and it is not so long. Therefore, due to aged deterioration of the insulating varnish treated with the insulating material, moisture absorption of the insulating sheet due to long-term suspension of the electric equipment, and the like, a leakage current is generated between the winding bodies 4 and 5 and the iron core 10, resulting in failure. Cause. Especially when the operating voltage of the electric equipment is high, it may cause a serious accident, which is not desirable.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art, extends the leak insulation distance of electric equipment as much as possible, and ensures electrical safety even under adverse conditions such as moisture absorption. An object of the present invention is to provide a slot insulating structure for electric devices which is effective for achieving a long life while maintaining the same.

[0006]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a substantially U-shape from the bottom of a slot 11 of an electric device to both side walls thereof. The bottom of the winding body 14 and the winding body 14, The winding body 1 is in contact with both sides of
One or more first insulating sheets 12, 12, ... Overlaid above 5, and the first insulating sheet 12 and the winding body 1
4, 15 or another second U-shaped member, which is composed of both side portions interposed between the first and second insulating sheets 12 that overlap each other and a bottom portion that is located above the winding body 15. , And the first insulating sheet 12, 12 ... and the second insulating sheet 1
6 is a slot insulating structure of an electric device which surrounds the winding body by 6, 16 ...

It is also possible to stack several sheets of the above-mentioned first insulating sheets 12, 12 ... And use one sheet of the second insulating sheet 16. Further, if a plurality of second insulating sheets 16 are used and are alternately arranged with the first insulating sheets 12, 12, ..., The leakage insulating distance can be further extended, and more preferable slot insulation can be configured. You can For both, it is convenient to use a plurality of insulating sheets which are the same or different from each other. With such a configuration, more sufficient slot insulation can be achieved.

[0008]

In the present invention, as described above, the first and second insulating sheets 12 and 16 are used, and both of them are combined to form the winding body 1.
The so-called slot insulation between the cores 4 and 15 and the iron core 10 is formed. Therefore, the leakage insulation distance in this case is greatly extended as compared with the conventional slot insulation. By slightly increasing the number of insulating sheets 12 and 16, the leak insulation distance can be easily extended to a great extent. Therefore, even if the insulating sheets 12 and 16 themselves and / or the insulating varnish are aged and moisture is absorbed, the leakage current resistance is significantly improved.

Further, in the present invention, the number of the first insulating sheet 12 and the second insulating sheet 16 and the order of folding can be changed. With such a structure, a more reliable slot can be obtained. Isolation is achieved.

Therefore, the life of the slot insulation, that is, the life of the device body can be extended, and the malfunction of the electric devices before the complete dielectric breakdown and the damage due to the dielectric breakdown can be greatly reduced. ..

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be disclosed below by explaining the embodiments shown in the drawings. FIG. 1 is a vertical sectional view of a first embodiment showing a configuration example of slot insulation of an electric device of the present invention.
In the figure, the iron core 10 is formed with slots 11, 11 ... In each slot 11, first insulating sheets 12 and 12 are arranged in a substantially U-shaped state, and here, two layers of winding bodies 14 and 15 are inserted therein.
After inserting the lower winding body 14, the interlayer insulation 18
And then the winding body 15 is inserted. The winding body 1
Above the upper parts 4 and 15, the upper ends of the inner insulating sheet 12 are overlapped with each other. From above, the second insulating sheet 16 is covered in a substantially inverted U-shape. Further, the first insulating sheet 12 is arranged outside the second insulating sheet 16, and both upper ends of the first insulating sheet 12 are arranged above the winding body 15, that is, substantially opposite to the second insulating sheet 16. Stack on top of the U-shaped bottom.

The winding bodies 14 and 15 formed in this way and the first insulating sheets 12 and 1 that enclose them together
The material and thickness of the second and second insulation sheets 16 and the like, the insulation class, and the like are determined in consideration of the rating of the electric device, the voltage applied to the winding bodies 14 and 15, and the like. The second insulating sheet 16 is preferably as long as possible and preferably extends to the lowermost end. It would be more convenient if it could be folded under the winding body 14 at the bottom, but this would be difficult in operation. The second insulating sheet 16 is determined to be as long as possible in consideration of its insertion work convenience, insulating effect, and the like.

In the first embodiment, a wedge (wedge) 17 such as a press board or a synthetic resin laminated plate is further used,
In this example, the winding bodies 14 and 15 formed as two-layer windings are physically fixed by engaging with the vicinity of the opening of the slot 11. The structure and material of such slots 11 and wedges 17,
The dimensions etc. should be decided by the same consideration as the general one. Since the winding bodies 14 and 15 are formed in two layers, the interlayer insulation 18 is interposed as described above. When the winding body is a single layer winding, the structure is simpler.

FIG. 2 shows the main parts of the first embodiment shown in FIG. 1 so that the relationship between the insulating sheets 12, 12 and 16 can be understood, and the first insulating sheet is shown. It can be understood that the leakage insulation distance formed by the second insulation sheet 16 and the second insulation sheet 16 is significantly extended as compared with the conventional example, as indicated by a broken line connecting A and B.

FIG. 3 shows three first insulating sheets 22 and 2.
2 and 22 and two second insulating sheets 23 and 23 are used to further extend the leak insulation distance. In this second embodiment, three first insulating sheets 22, 22, 22 are superposed and inserted into the slot in a substantially U-shaped state, and the first insulating sheet 22,
The winding body 14, the inter-layer insulation 18, and the winding body 15 are sequentially inserted into the layers 22 and 22. After that, first, both ends 26, 26 of the innermost first insulating sheet 22 are superposed on the upper part of the winding body 15. Then, the outer side of the second insulating sheet 23 is bent into a substantially inverted U-shape and covered with the second insulating sheet 23 below, and both ends 26 of the intermediate first insulating sheet 22 are placed on the bottom of the second insulating sheet 23. , 26 are similarly folded and overlapped. Then, the upper second insulating sheet 23 is further covered therewith in a state of being bent in a substantially inverted U shape, and finally, the both end portions 26 of the outermost first insulating sheet 22 are finally placed thereon. , 26 are mutually folded and overlapped.

In the second embodiment shown in FIG. 3, both insulating sheets 22 and 2 are formed in the same manner as between A and B in FIG.
As you can see by tracing between 2, 22, 23, 23,
It is easy to see that the leakage insulation distance is greatly extended.

[0017]

According to the slot insulating structure of the electric equipment of the present invention, in addition to the first insulating sheet which is widely used in the past and whose both ends are folded over above the slot, a substantially inverted U-shape is formed between them. By interposing the second insulating sheet to be inserted, the leak insulation distance can be greatly extended. As a result, slot insulation, which was the weakest point in the winding structure, was strengthened, leakage current due to deterioration over time of the insulating varnish and insulating material or moisture absorption was minimized, and failure due to insulation breakdown was prevented. It has become possible to significantly reduce the life of the equipment.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the configuration of a slot insulating structure of an electric device according to a first embodiment.

FIG. 2 is an explanatory diagram showing an effect of the slot insulating structure of the electric device according to the first embodiment.

FIG. 3 is an explanatory diagram of a slot insulating structure of an electric device according to a second embodiment.

FIG. 4 is a vertical cross-sectional view showing a configuration of a slot insulating structure of a conventional electric device.

FIG. 5 is an explanatory diagram showing an effect of a slot insulating structure of a conventional electric device.

[Explanation of symbols]

 10 iron core 11 slot 12 first insulating sheet 14 winding body 15 winding body 16 second insulating sheet 17 wedge 18 interlayer insulation 22 first insulating sheet 23 second insulating sheet 26 edge part

Claims (3)

[Claims] 1. An electric device, which is arranged in a substantially U-shape from the bottom of a slot to both side walls, is in contact with the bottom and both sides of a winding body, and both ends thereof are superposed above the winding body. And a plurality of first insulating sheets, and both side portions interposed between the first insulating sheet and the winding body or another first insulating sheet overlapping with each other and above the winding body. A second insulating sheet having a substantially bottom shape and arranged in a substantially inverted U shape, and an electric device surrounding the winding body with the first insulating sheet and the second insulating sheet. Slot insulation structure. 2. The plurality of the first insulating sheets arranged in a substantially U-shape and the second insulating sheets arranged in a substantially inverted U-shape are a plurality of sheets. Slot insulation structure for electrical equipment. 3. The first insulating sheet arranged in a substantially U shape is alternately folded so that both upper ends of the first insulating sheet surround a winding body, and is arranged in a substantially inverted U shape. 3. The slot insulation structure for an electric device according to claim 2, wherein both side portions of the second insulating sheet are overlapped with each other so as to surround the lowermost portions of both side portions of the first insulating sheet.