JPS63213331A - Gas-insulated electric apparatus - Google Patents

Abstract

PURPOSE:To simplify a configuration for cooling insulating gas by disposing cooling piping having cooling fins in a tank, feeding cooling medium thereto and cooling it by bringing the gas into contact with the piping. CONSTITUTION:Insulating gas heated by the heat of a transformer body 1 rises in a tank 4 to arrive at its top to be brought into contact with cooling fins 6 and piping 7. Accordingly, the heat of the gas is transmitted to cooling medium passing the interior of the piping 7 to be cooled, and the cooled gas drops in the tank. The heat of the body 1 is cooled by the medium passing the pipe by means of the convection of the gas by repeating the operation. Thus, the cooling structure can be reduced in size and weight, the tank temperature is decreased, and air conditioner and ventilation facility in the chamber can be reduced in capacity or omitted.

Description

[Detailed description of the invention] (Industrial application field) This invention relates to gas insulated electrical equipment.

(Prior Art) In recent years, gas insulated transformers, which have excellent disaster prevention properties, have come to be widely used as electrical equipment such as transformers for urban buildings. The main body of the transformer, which consists of windings wound around an iron core, is housed in a tank, and SF and gas are filled up to a predetermined pressure as a medium for both insulation and cooling. Normally, it is required to keep the temperature rise due to heat generation in the transformer body within standard limits, and for this reason conventionally a self-cooling type radiator with the necessary heat dissipation capacity was attached.

In other words, these 9 types of self-cooling radiators are installed in parallel to the tank.

The two are connected by pipes above and below. According to this, it was warmed by the heat generated by the transformer itself.
Insulating gas, which is a cooling medium, moves from the top of the tank through a pipe to a radiator, where it is cooled, and then returns to the inside of the tank through a pipe from the bottom. In this way, the insulating gas is repeatedly cooled by the radiator due to its convection action.

However, the heat transfer coefficient of the above-mentioned insulating gas is extremely small, about one-tenth that of insulating oil, so generally in the case of a transformer with the same loss, the heat sink area is Approximately 6 to 1 liters larger than the radiator used for oil-filled transformers
It is necessary to use a heatsink that is O times wider.

(Problems to be Solved by the Invention) This invention eliminates the use of a conventional self-cooling type radiator for cooling the insulating gas used for insulating and cooling gas-insulated electrical equipment. The purpose of this invention is to simplify the configuration for cooling this type of insulating gas.

(Means for Solving the Problems) This invention arranges a cooling pipe equipped with cooling fins inside a tank that houses an electrical equipment main body such as a transformer main body, and allows a cooling medium to flow through the cooling pipe. , characterized in that the insulating gas is cooled by coming into contact with the piping.

(Embodiment) In Fig. 6, which explains an embodiment of the present invention by means of drawings, 1 is a transformer main body mainly composed of an iron core 2 and a winding 3 wound around the core, and 4 is a transformer main body 1. It is a tank in which a
F, gas) is sealed. 5 is a bushing.

These structures are not particularly different from conventional transformers of this type.According to the present invention, instead of the conventional self-cooling radiator, cooling fins 6 are provided above the inside of the tank 4 for cooling. The piping 7 is arranged. Cooling water or other cooling medium is forced to flow inside the pipe 7.

This piping 7 is made of a combination of stainless steel, iron, aluminum, copper, etc., and has good heat transfer.

Furthermore, materials with excellent corrosion resistance are used. This has a continuous spiral shape and is fixed to the tank 4 by welding or the like. Further, each end portion 8° 9 is led out to the outside of the tank 4.

In the above configuration, the insulating gas warmed by the heat of the transformer body 1 rises inside the tank 4. When it reaches the upper part, it comes into contact with the cooling fins 6 and the piping 7 there, so the heat of the insulating gas is transferred to the cooling medium passing through the inside of the piping 7 and is cooled. The cooled insulating gas descends within the tank.

Due to the convection effect of the insulating gas by repeating the above operations, the heat in the transformer main body 1 is cooled by the cooling medium flowing in the pipe. When such a cooling medium is used, the heat radiation effect is better than when a self-cooling type radiator is used. Moreover, the rise in temperature of the tank 4 itself is also reliably suppressed.

Note that when cooling water is used as a cooling medium, the temperature of the cooling water increases, so it is preferable to use the heated cooling water for temperature control and other purposes such as heating.

(Effects of the Invention) As detailed above, according to the present invention, the heat radiation effect is improved compared to the conventional self-cooling type radiator, so that the cooling structure can be made smaller and lighter. Furthermore, since the temperature of the tank is lowered, the capacity of air conditioning and ventilation equipment in the room where the tank is installed can be reduced or omitted.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and FIG. 2 is a front view with the left half in section, FIG. 2 is a plan view with the left half in section, and FIG. 3 is an enlarged sectional view of piping. 1...Transformer body, 4...Tank, 6...Cooling fin, 7...Piping.

Claims (1)

[Claims] Gas-insulated electrical equipment is made by arranging cooling piping equipped with cooling fins inside a tank that houses the electrical equipment body together with insulating gas, and through which a cooling medium flows.