JPS6365608A - Gas insulated electrical machinery and apparatus - Google Patents

Abstract

PURPOSE:To reduce noise as well as to remove the resonance phenomenon generating on the side plate of a tank by a method wherein a tilt angle is given to the side plate against the side wall of the internal surface of a tank opposing to an iron core, or a sound-insulating plate or a sound-absorbing plate having curvature is provided. CONSTITUTION:The height of the upper sound-insulating plate 10A is almost same as the height of the upper exposed part of an iron core 1, the lower sound- insulating plate 10B is provided at the position of the lower part of the iron core 1 opposing to the upper sound-insulating plate, and a tilt angle theta is given to said sound-insulating plate against the side plate of a tank 4. The upper sound-insulating plate 10A reflects the vibration and noise coming from the iron core 1 as shown by the broken line, and their direct propagation to the side plate of the tank 4 is prevented. The lower sound-insulating plate 10B is arranged in such a manner that the vibration and noise coming from the iron core will not be propagated directly to the side of cooling device 7 through the lower piping 8B. As a result, the reduction in noise of the entire electric machine can be achieved, and the resonant phenomenon of the tank side plate can also be eliminated.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to electrical equipment such as transformers and reactors,
In particular, the present invention relates to a cooling and soundproof structure suitable for electrical equipment sealed with SFa gas.

[Conventional technology]

A method of reducing noise by storing the iron core and heating element windings that generate vibration and noise in a tank, placing a cooler on the side of the tank, and connecting the tank and cooler to circulate the cooling medium. As such, various structures have been proposed in which a soundproof wall is provided around the outer circumference of the tank. (Jitsukai 50-10491
No. 6, Utility Model Application Publication No. 112917/1983).

[Problem that the invention seeks to solve]

j In the above-mentioned conventional technology, even if the tank is surrounded by a soundproof wall, noise propagates from the piping connection with the radiator to the radiator side, so additional noise countermeasures may be required. Therefore, it became necessary to reduce noise by adding a soundproof wall to the radiator, and to improve the soundproofing effect, the structure became complicated and the installation space for electrical equipment became large. The purpose of this is to increase the cooling effect without adversely affecting the circulation of the cooling medium, and to reduce vibrations from the iron core.

The purpose is to reduce the propagation of noise to the outside.

[Means for solving problems]

The above object is achieved by making the side wall of the inner surface of the tank facing the iron core have an inclination angle with the tank side plate, or by providing a sound insulating plate or a sound absorbing plate with a curvature.

[Effect]

This sound insulating plate or sound absorbing plate blocks vibrations of the iron core and II sound from propagating directly to the cooler side from the tank side plate and piping communicating with the cooler via the cooling medium.

Therefore, noise can be reduced and the resonance phenomenon of the tank side plate can also be eliminated.

Note that even if the sound insulating board or the sound absorbing board is sloped with respect to the tank side board, a board with a curvature will have the same effect.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG.

In electrical equipment such as a transformer, an iron core 1 and a winding 2 are hermetically housed in a tank 4, a cover 5, a base 6, and the like.

In order to cool this iron core 1 and winding 2, a cooler 7 is arranged around the outer periphery of the tank, and upper and lower tubes 8A.

At 8B, the tank 4 and the cooler 7 are in communication.

The iron core stand 3 supports the iron core 1 combined with the winding 2.

In FIG. 1, the cooling medium 9 such as SFe gas cooled by the cooler 7 is introduced into the tank 4 through the lower piping 8B, but once inside the tank 4 by the lower sound insulating plate 10B, the cooling medium 9 is It can be introduced into the lower surface of the winding 2 to improve the circulation effect.

The upper sound insulating plate 10A is approximately the same in height as the exposed upper part of the iron core 1, and the lower sound insulating plate 10B is provided at a position equivalent to the lower part of the iron core 1, facing the same position, and is at an angle of 0 with the side plate of the tank\4. It is sloped.

The upper sound insulating plate 10A reflects vibrations and noise shown by broken lines from the iron core 1 and prevents them from directly propagating to the side plate of the tank 4.

The lower sound insulating plate 10B is arranged so that vibrations and noise from the iron core 1 are not directly propagated to the cooler 7 side through the lower piping 8B.

Next, it will be explained with reference to FIG.

Sound insulation board 10A, sound absorption board 1 on the surface facing the iron core of IOB
Install 1A and 11B.

A soundproof wall 13 around the outer circumference of the tank 4, which has been implemented conventionally,
The combination of the vibration isolating material 12 laid under the core stand 3 and the sound insulating plates 10A and IOB according to the present invention and the sound absorbing plates 11A and IIB can reduce the noise of the entire electrical equipment.

According to this embodiment, since vibration noise is not directly propagated to the tank side plate facing the iron core, resonance development of the tank side plate can be eliminated.

Further, the lower sound insulating plate can introduce a medium such as cooled SFe gas to the winding side which is a heating element, promote circulation of the cooling medium, and improve the cooling effect.

〔Effect of the invention〕

According to the present invention, it is possible to block the vibration and noise of the iron core from directly propagating to the tank side plate and the cooler side, and especially in electrical equipment using SFe gas, etc., the area occupied by the pipe 8B is relatively large. Effective for self-cooled gas-insulated electrical equipment.

[Brief explanation of drawings]

1 and 2 are cross-sectional views of one embodiment of the present invention. 1... Iron core, 2... Winding wire, 4... Tank, 7...
・Cooler, 8A, 8B-・Piping, IOA, 10B-・
・Sound insulation board, 11A, IIB...Sound absorption board.

Claims (1)

[Claims] 1. A tank that stores a winding and an iron core, a cooler that cools the winding and the iron core, piping that connects the tank and the cooler, and an insulating cooling medium that connects the tank and the cooler. In the electrical equipment that circulates between the tank, the inner side wall of the tank is sloped with the tank side plate, or a sound insulating plate or a sound absorbing plate with a curvature is provided, and the sound insulating plate or the sound absorbing plate absorbs noise from the iron core. Gas insulated electrical equipment, characterized in that it is arranged so as to prevent the gas from directly propagating from the side plate of the tank or the piping leading to the cooler.