JPH03272115A - High-tension electric machine - Google Patents

Abstract

PURPOSE:To improve the strength of an insulator by alleviating the gap between high-tension conductors and the insulators located around the high-tension conductors and the electric field on the surface of each insulator by a method wherein a light- hardening type insulator is filled into a wedge-shaped gap and the like. CONSTITUTION:A photosetting type insulator 20 is filled in wedge-like gaps 10, 11 or 12, generated respectively between an electrostatic shield 5 and a spacer 7, between a barrier-like molded insulator 4 and a supporting insulator 6, or between the insulator 4 and a base insulating cylinder, and other microscopic gap parts. When the above- mentioned fitting operation is going to be performed, after the operation has been conducted within the range of light of the wavelength region having no component of photosetting wavelength, insulating material is hardened by projecting the light having the wavelength region required for hardening of the part to be hardened when the hardening operation is conducted. As a result, the gaps 10, 11 and 12 and the like between a high-tension conductor and the insulator, or between the insulator and other insulator, or the electric field on the surface of those insulators is alleviated, and the title high-tension electric machine having excellent dielectric strength, can be manufactured easily.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to high-voltage electrical equipment, such as a gas-insulated transformer, in which a high-voltage conductor is housed together with an insulating medium in a metal container. It is related to.

(Prior Art) High-voltage electrical equipment that supports high-voltage conductors through insulating support members in a closed metal container, such as high-voltage transformers, circuit breakers, switches, conduit busbars, etc. In electrical equipment, it is necessary to suppress the strength of the electric field applied to each part of the structural member to a permissible current or less due to the insulation properties.

FIG. 3 shows the configuration of a typical transformer winding as an example of conventional high-voltage electrical equipment. As shown in the figure, a wire 2 coated with insulation is wound around an insulating tube 8 in a disc shape via a rail 1, and this disc-shaped wire fi 12 is passed through a spacer (not shown) to a shaft. A transformer winding 3 is constructed by stacking a plurality of layers in a direction and making predetermined connections. In order to control the electric field at the upper and lower ends of the winding 3, a barrier-like molded insulating material 4 and an electrostatic shield 5 are disposed at the ends of the winding 3 via spacers 7, and support is provided at the ends of the winding 3. These are supported by an insulator 6.

In the transformer winding constructed in this way, the insulation strength largely depends on the dielectric strength of the transformer winding and the insulating oil or insulating gas which are both insulating media housed in a metal container.

(Problems to be Solved by the Invention) The conventional high-voltage electrical equipment as described above has the following problems to be solved.

That is, as shown in FIG. 3 as an example, in a gas insulated transformer, an electrostatic shield 5 and a pearl-like molded insulating material 4 are arranged to control the electric field at the upper and lower ends of the winding 3. However, these electrostatic shields 5 and molded insulation 4 are manufactured separately from the windings 3 and are combined during assembly. Therefore, a small gap 10, 11° 12 is formed between the electrostatic shield 5 or the molded insulating material 4 and the spacer 7, or the insulating tube 8 or the supporting insulator 6, sandwiched between the insulators. . In particular, such a gap is often a wedge-shaped gap in which the gap length changes continuously, or a minute gap. Such a wedge-shaped gap or a minute gap of 7°1θ.

When 11.12 occurs, the gap f10°11
．． 12 is filled with insulating gas, so the dielectric constant ε of the insulating gas is 1.0, whereas the dielectric constant of the insulator is several times that, so the electric field concentrates in the gap 10° 11.12. There was a risk that the breakdown electric field of the insulating gas would be exceeded and dielectric breakdown would occur. Moreover, such a minute gap 10,1
1. In order to alleviate the electric field in the 12th section, even if the insulation distance of the gap is increased, the electric field will not be alleviated proportionally, so a much larger insulation distance is required, and the gas insulated transformer must be made larger. Put it away. Furthermore, such a gap 1
A solid molded insulator that matches the shape of this part is manufactured and scraped so as not to cause gaps 10, 11, and 12.
11.12 could be considered, but it is difficult to make the shape of the solid molded insulator perfectly match the gap and make it adhere tightly to the gap, and on the contrary, it would create even smaller gaps and increase weaknesses in the insulation. It is also difficult to process and assemble. Furthermore, as another means, use a resin such as epoxy.

11.12 may be considered as a method of filling and solidifying, but if air bubbles or the like remain inside the resin during curing, the dielectric strength will drop significantly in this area. For this reason, a step of degassing under reduced pressure is required during the resin filling process, but if the resin hardens during this process, degassing may not be done sufficiently and there is a risk that the resin will harden and become casing. . Alternatively, a vacuum heating process is required to cure the resin in the housing, which has the disadvantage of increasing the number of manufacturing steps. Furthermore, for example, in FIG. 3, when filling the gaps at the upper and lower ends of the winding 3 with resin, the upper gaps 10,
11.After filling and curing 12, lower gap 1
0.0, 11.12, and the vacuum heating process for the entire winding had to be repeated twice, making the manufacturing process troublesome.

The present invention eliminates the above-mentioned drawbacks, alleviates the electric field in gaps between high voltage conductors and insulators arranged around them, or on the surfaces of these insulators, has excellent insulation strength, and is easy to manufacture. The purpose is to obtain high voltage electrical equipment.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above object, the present invention provides a high-voltage electrical device in which a high-voltage conductor and an insulator are enclosed together with an insulating medium in a metal container. However, the gap between a high-voltage conductor and an insulator, or the gap between two insulators, or the surface of a high-voltage conductor or an insulator is impregnated, filled, or coated with a photocurable insulator. It is designed to be cured by irradiation.

(Function) According to the high voltage electrical equipment of the present invention, the photocurable insulator can be easily applied to conductors, insulators, and between them without degrading the insulation performance of the insulating material such as leaving bubbles. It can be impregnated, filled, or coated to prevent the formation of minute gaps or wedge-shaped gaps, thereby preventing the electric field from concentrating, and further increasing the dielectric strength by covering metallic foreign substances present in various parts. At the same time, it is possible to increase the standing electric field of foreign matter, increase the breakdown electric field of each part, and effectively prevent discharge from creeping along the surface.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG. 1, in which the same parts as in FIG. 3 are denoted by the same reference numerals.

6- Among them, a transformer winding will be explained as an example.
A high voltage conductor housed in a metal container together with an insulator can be similarly applied to other high voltage electrical equipment such as a pipe busbar or a switchgear.

In this embodiment, as shown in FIG. 1, a wedge-shaped gap 7610 is formed between the electrostatic shield 5 and the spacer 70.
, the wedge-shaped gap 1 which occurs between the barrier-like molded insulator 4 and the support insulator 6, or the wedge-shaped gap 12 which occurs between the molded insulator 4 and the basic insulation cylinder 8, etc. The portion is filled with a photocurable insulator 20.

The photo-curable insulator 20 may be an insulating material that becomes a complete solid after curing, a material such as polybutadiene that becomes a rubber elastic body after curing, or a semi-solid bamboo material. Insulators may also be used. When filling, the entire winding 3 may be placed under reduced pressure to remove air bubbles in the photocurable insulating material 20, or the photocurable insulating material 20 may be decompressed and degassed without irradiation with dim light. Insulation reliability can be further improved by taking measures such as filling with During filling, the insulating material is cured by irradiating it with light in the wavelength range required to harden the part to be cured, after working with light in a wavelength range that does not have a photocuring wavelength component. .

With this configuration, gaps 10 and 1 that occur between the winding 3 and the insulator, which could conventionally be a weak point in insulation, are eliminated.
1.12 is completely filled with the photocurable insulator 2o, so the gear luff 6 no longer stops. The dielectric constant of an insulator is usually several times that of a gas, so it was filled with a photocurable insulator 2o, but the gap 10, 11.12 is proportional to the reciprocal of the dielectric constant as the gap length becomes smaller. However, since such a gap 10° 11.12 is completely filled with the photocurable insulator 2o, the electric field is not concentrated and the insulation reliability is greatly improved.

In addition, since the photocurable insulator 20 blocks light with wavelengths within the curing range, curing can be freely adjusted, so that the insulating material can be completely defoamed without leaving any bubbles before curing begins. It can be cured by irradiating light after degassing, greatly improving workability. In addition, large-scale equipment such as a heating device for curing, which is required for conventional thermosetting insulators, is not required, and the insulator can be easily cured without applying external stress such as heating of the main body of the device. Moreover, it is possible to fill each part with the photocurable insulator 20 according to the work process. For example, after filling and curing the upper gap 10° 11.12, the lower part 10, 11.12 can be filled into the main body of the device. It can also be filled in an upside-down trench, and there is no need for a special mold or container for filling with insulators, making manufacturing easy.

Further, as the photocurable insulator 20, a rubber elastic body or a gel-like photocurable insulating material may be used.

In particular, it has a large ability to absorb mechanical impact force, has excellent shock and vibration absorption ability, and can soften shock and vibration during driving and transportation. In addition, there is no peeling or gaping when exposed to vibrations or shocks, and there is no change in dimensions or misalignment between the molded insulator and the supporting insulator, including the insulating material, even during long-term operation. This prevents this from occurring and further stabilizes insulation reliability.

FIG. 2 shows an embodiment in which the present invention is applied to a pipe busbar.

In this embodiment, a high voltage conductor 23 serving as a current carrying conductor is supported by an insulating support member 22 within a metal container 21.
is stored. The insulating support member 22 is formed by embedding a low voltage electrode 31 and a high voltage electrode 32 in an insulating member 22a made of synthetic resin such as epoxy resin. The low voltage electrode 31 is in contact with the inside of the metal container 21, and the high voltage electrode 32 in the housing is in contact with the high voltage conductor 23 to insulate and support the high voltage conductor 23.

The inner surface of the metal container 21, the creeping surface of the insulating support member 22, the surface of the high voltage conductor 21, and the gap between the high voltage conductor 21 and the insulating support member 22 are coated with or filled with a photocurable insulator 20. The photocurable insulator 2 is then irradiated with light during or after assembly.
Harden 0.

10- In this embodiment having such a configuration, the inner surface of the conduit bus bar is entirely covered with the photocurable insulator 20, so the dielectric strength is higher than in the case of bare electrodes. ,
Even if a foreign metal object were to enter the metal container 21 during assembly, the foreign metal object would be covered by the photocurable insulator 20, thereby preventing the foreign metal object from standing up due to the electric field and causing dielectric breakdown i/+7.

In addition, especially when insulating the pipe bus with an insulating gas, the photocurable insulator 20 on the inner surface of the pipe bus is applied before filling with the insulating gas, and then cured by irradiating light after filling. When the insulating gas is filled with the insulating gas, there is no possibility that metal foreign matter will fly off and adhere to the insulating support member 22. - Even if a foreign metal object is attached to the insulating support member 22 from the beginning, the foreign metal object is covered by the photocurable insulator 20! Therefore, the creeping insulation performance of the insulating support member 22 hardly deteriorates.

In addition, even if you press the button in the first embodiment or the second embodiment, the intensity of the irradiated light can be changed, for example, only the surface can be temporarily hardened,
After assembly, it is possible to further increase the intensity of light to completely cure the material in an internal oven, or to apply heat and cure it by heat curing, thereby further enhancing the action and effect of the present invention. It is also possible.

〔Effect of the invention〕

As described above, according to the present invention, in a high-voltage electrical device in which a high-voltage conductor and an insulator are sealed together with an insulating medium in a metal container, there is a gap between the high-voltage conductor and the insulator, or between the insulators. The gap or the surface of a high voltage conductor or insulator is impregnated, filled, or coated with a photocurable insulator and then cured by irradiation with light, so high voltage conductors and insulators placed around them are cured. By relaxing the electric field in the gap between the two or on the surface of the insulator, it is possible to obtain a high-voltage electric device that has excellent insulation strength and is easy to manufacture.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the high voltage electrical equipment of the present invention, Fig. 2 is a sectional view showing an embodiment in which the invention is applied to a conduit busbar, and Fig. 3 is a sectional view of a conventional transformer winding. It is a sectional view showing an example. 1... Rail, 2... Element wire, 3... Winding wire, 4...
- Molded insulator, 5... Electrostatic ring, 6... Support insulator, 7... Spacer, 8... Basic insulation tube, 10, 1
1, 12... Gap, 20... Photocurable insulator.

Claims (1)

[Claims] In high-voltage electrical equipment in which a high-voltage conductor and an insulator are enclosed together with an insulating medium in a metal container, the gap between the high-voltage conductor and the insulator, or the gap between the insulator and the insulator, or the surface of the high-voltage conductor or insulator. A high-voltage electrical device characterized by being impregnated, filled, or coated with a photocurable insulator and then cured by irradiating it with light.