JPS631013A - Directly buried type transformer - Google Patents

Abstract

PURPOSE:To make it possible to bury a transformer directly in the ground for employment, by constructing a heat-receiving member of a heat pipe out of a plurality of corrugated tubes joined by header tubes and by disposing this heat-receiving member above a coil member. CONSTITUTION:An insulating oil 3 fills a closed vessel 2, and a heat-receiving member 6 constituting one end side of a heat pipe 4 is immersed in the insulating oil 3 is such a manner that it is positioned above a coil member 1. This heat-receiving member 5 has a construction wherein the ends of a plurality of corrugated tubes 6 arranged in parallel mutually are made to communicate with each other by a header tube 7, and the heat pipe 4 is constructed by connecting a pipe 8 to one header tube 7, while the whole of these tubes 6 and 7 the pipe 8 are set in a closed structure. After a non-condensable gas is exhausted out of the structure, a condensable fluid is enclosed therein as an operating fluid. By this construction, heat emitted from the coil member 1 is released into the air by the pipe 4. A transformer constructed in this way can be buried directly in the ground for employment without providing a handhole.

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a transformer, and more specifically to a so-called horizontal type transformer in which a plurality of coil sections are arranged in parallel, and which is installed underground. It is.

Conventional technology: When an overhead service line intersects with the cone in a busy shopping district,
It is well known that an underground wiring system is adopted, and in that case, it is known that not only the low-voltage service line but also the transformer are underground. Conventionally, underground transformers used in this power distribution system are installed in a handball (underground hole) in the sidewalk area, and the handhole is covered with grating (tetsunameko lid), etc. It is considered a closed contingency.

Problem to be Solved by the Invention However, in order to promote temperature rise from the transformer body and suppress its temperature rise, the hand hole has to be made much larger than the transformer body, and therefore In the case of the so-called horizontal type, in which the coil parts that directly correspond to one loaf are arranged in parallel, the gripping range is wide.
In addition to requiring a large space, there was a problem in that construction costs and other costs were high. In addition, since it is necessary to use a lid such as a grating with openings to dissipate heat into the air, it is impossible to avoid the intrusion of sewage and preparation into the hand hole. There were problems that required maintenance such as inspection.

The above problem is due to the need to take heat dissipation measures to prevent the temperature rise caused by the heat generated by the transformer. Attach a pipe to increase heat dissipation (
It is conceivable to have a configuration that converts into However, in this case, it is necessary to ensure sufficient heat receiving area from the transformer and to have good durability. Therefore, simply attaching a heat pipe to an existing transformer is not practical enough. It will not be one culm.

This invention was made in view of the above circumstances, and an object of the present invention is to provide a transformer that can be directly buried underground without the need for a conventional hand hole.

Means for Solving the Problems In order to achieve the above-mentioned objects, the present invention provides a method in which a plurality of coil parts that directly perform voltage transformation are immersed in insulating oil in a closed container and arranged in parallel. The ends of a plurality of corrugated pipes arranged parallel to each other are connected to a header pipe to form a heat receiving section, and the pipes are connected to the header pipe, and the whole of these corrugated pipes, the header pipe, and the pipes are sealed. After exhausting non-condensable gas, a condensable working fluid is sealed inside the heat pipe, and a heat pipe is provided.
The heat receiving part of the heat pipe is immersed in the insulating oil so as to be located above the coil part inside the sealed container, and the heat pipe is roughly pulled out from the sealed container. 8. The device is characterized by being placed in a heat dissipation section whose temperature is below the temperature to be maintained.

Therefore, in the transformer of the present invention, the heat generated from the coil section is first transmitted to the insulating oil, and then the working fluid in the heat receiving section of the heat pipe is heated and evaporated, and the vapor is transferred to the header pipe and the pipe. It flows to the end on the heat radiating part side through the radiator, radiates heat, and condenses and liquefies. That is, the heat pipe carries the heat generated from the coil section to the heat radiation section to cool the transformer itself. In that case, in this invention, since the heat receiving part of the heat pipe is configured by connecting multiple corrugated pipes with a header pipe, a sufficiently large heat receiving area can be secured without particularly attaching fins, and]
Due to the flexibility of the corrugate, it is highly resistant to vibrations, and by arranging the heat receiving section above the coil section, good heat transfer to the heat pipe occurs.

Examples of this defense will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an embodiment of the present invention, in which two coil units 1 that directly perform voltage transformation are arranged in parallel inside a closed container 2, and the closed container 2 is connected to the ground. It is constructed to be robust enough to withstand external pressure when buried inside, and is provided with a high-voltage cable lead-in part and a low-voltage cable lead-out part (each not shown) at its upper end. Furthermore, the inside of the airtight container 2 is filled with insulating oil 3 in the form of a rod-shaped skewer in which the coil portion 1 is completely immersed. The heat receiving part 4 on the side is immersed so as to be located above the coil part 1.

Here, the heat pipe 4 transports heat as latent heat of the working fluid sealed inside, and is used to transport heat from the closed container 2.
The heat receiving portions 5 arranged inside are arranged parallel to the beans as shown in FIGS. 2 to 4. =Reproduced book] Each of the Lugut tubes 6 is connected to each other by a header tube 7 to form a flame-like shape, and the heat pipe Zl is formed by connecting a pipe 8 to one of the header tubes 7, The corrugated pipe (6ct), the header pipe (7), and the pipe (8) are all completely closed off, and after completely exhausting non-condensable scum such as air from inside, the condensation of water, etc. [raw fluid is sealed as a working fluid 9.

In addition, inside the corrugated pipe 6 etc. with this sealed structure,
A wick made of wire mesh or the like may be provided to generate capillary pressure. And inside the airtight container 2,
The heat receiving parts 5 of three sets of heat pipes 4 are accommodated, and each heat receiving part 5 is stacked vertically so that its corrugated tubes 6 form a parallel cross-shaped structure, and is arranged above the coil part 1. Further, the pipes 8 connected to each header pipe 7 are drawn out from the closed container 2 and placed in a predetermined heat radiating section 10.

The heat dissipation section 1Q is essentially a section that dissipates the heat carried by the heat pipe 4, and since the temperature that the transformer should maintain is generally below atmospheric temperature, the heat dissipation section 10 is a section that dissipates the heat carried by the heat pipe 4. It may be configured such that the end portion of the tube is simply curved, or it may be configured to actively perform air cooling or water cooling.

FIG. 5 is a schematic diagram showing the usage state of the transformer configured as described above, in which the entire transformer is buried underground as it is, and the end of the pipe 8 in the hild pipe 4 is drawn out into the atmosphere. A heat dissipation section 10 is formed by attaching fins 11 thereto.

The temperature of the insulating oil 3 filled in the sealed container 2 rises due to the heat generated in the coil part 1 due to power transmission, but the insulating oil 3 that floats due to the increased temperature transfers its heat to the heat receiving part 5.
The working fluid 9 in the heat receiving section 5 evaporates due to the heat, and the vapor increases in temperature and reaches the heat radiating section 10 with low pressure.
It flows to the side end, releases heat, and condenses into liquid. That is, the heat generated by the coil portion 1 is released into the atmosphere by the heat pipe 4, thereby preventing the temperature of the transformer as a whole from rising. In this case, the heat receiving section 5 of the heat pipe 4 is constructed of corrugated pipes 6 in a lattice shape, and since the heat receiving section 5 is arranged above the coil section 1 where the oil temperature is highest, the heat receiving section 5 The temperature difference between the heat pipe 4 and the insulating oil 3 becomes large, and the heat transfer area becomes large, so that the heat radiation efficiency through the heat pipe 4 becomes good. Furthermore, since the heat receiving section 5 is mainly composed of a corrugated pipe 6, its flexibility provides good durability against vibrations. Since the heat receiving section 5 has a flat structure as a whole, it has a large surface area and is space efficient.

Therefore, even if the above-mentioned transformer is buried underground and placed in an insulated or heat-retaining state, it can be smoothly cooled down by the heat pipe 4, so there is no rise in temperature or problems associated with it. Then, the above transformer can be used by being directly buried underground without providing a hunt hole.

Effects of the Invention As is clear from the above explanation, according to the transformer of the present invention, it is possible to carry the cooling directly from the inside of the airtight container containing the coil section to a predetermined section for cooling. It can be used by directly burying it underground without providing a required hunt hole, thus reducing the space required and minimizing the cost of installation.

In addition, in this invention, as the heat pipe that carries heat to the heat dissipation part, the heat receiving part is formed into a hexagonal shape (with several corrugated pipes), so it is possible to increase the heat receiving area without requiring a large space. can. Furthermore, since the heat receiving part is placed above the coil part where the oil temperature is high, the temperature difference between the heat receiving part and the insulating oil becomes large, ensuring a high heat transfer coefficient, and ultimately increasing the heat dissipation efficiency via the heat pipe. be able to. Overall, according to this invention, it is possible to provide 1 q of underground transformers with excellent cooling performance.

[Brief explanation of drawings]

￥1 Figure is a sectional view showing one embodiment of the present invention, Figure 2 is a schematic plan view showing the heat receiving part of the heat pipe, Figure 3 is a side view of the same, and Figure 4 is a part of the heat receiving part. 5th cross-sectional view showing
The figure is a schematic diagram showing the state of use. DESCRIPTION OF SYMBOLS 1... Coil part, 2... Airtight container, 3... Insulating oil, /1... Bee 1-pipe, 5... Heat receiving part, 6
... Corrugated pipe, 7... Header pipe, 8...
・Pipe, 9... 1 working flow, 10... Heat dissipation section.

Claims (1)

[Claims] A plurality of coil sections that directly perform voltage transformation are immersed in insulating oil in a sealed container and arranged in parallel, while the ends of a plurality of corrugated tubes arranged parallel to each other are connected to a header tube to create a heat receiving section. A heat pipe is constructed by connecting a pipe to the header pipe, sealing the entire corrugated pipe, header pipe, and pipe, exhausting non-condensable gas into the inside, and then sealing a condensable working fluid. The heat receiving part of the heat pipe is immersed in the insulating oil so as to be located above the coil part inside the sealed container, and the pipe of the heat pipe is pulled out from the sealed container to the outside. A directly buried type transformer, characterized in that the transformer is placed in a heat dissipation section at a temperature below the temperature that should be maintained.