JPH0530336Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a gas-insulated electromagnetic induction device in which a liquid cooling medium is allowed to flow down onto the surface of a winding for cooling.

[Conventional technology]

An example of such a gas insulated electromagnetic induction device is a gas insulated transformer. This gas insulated transformer is filled with insulating gas, is lightweight and compact, does not require transformer oil, and is nonflammable.

This type of gas insulated transformer is shown in a schematic longitudinal sectional view in FIG. The figure shows the case of an outer iron type, where 1 is a tank, which is filled with insulating gas. 2 is an iron core of the transformer, 3 is a winding installed on this iron core in a vertical arrangement, 4 is a refrigerant liquid distribution plate, 5 is a refrigerant liquid (hereinafter referred to as "refrigerant liquid"), 6 is piping for this refrigerant liquid, 7 is a pump for circulating the refrigerant liquid 5, and 8 is a cooler that cools the winding 3 and cools the refrigerant liquid 5 whose temperature has risen.

The cooling effect of the gas insulated transformer is as follows. The refrigerant liquid 5 accumulated in the lower part of the tank 1 is passed through the cooler 8 by the pump 7, cooled, and sent to the refrigerant liquid distribution tray 4 in the tank 1. This walking plate 4
The refrigerant liquid 5 sprayed as shown by arrow A flows down the surface of the winding 3 as shown by arrow B, cools it, and accumulates at the bottom of the tank 1.

In a conventional gas insulated transformer, the winding portion is as shown in FIG. As shown in the cross-sectional view of FIG. 6, the winding 3 is formed by concentrically winding a conductor 3a coated with an insulating coating (not shown), and solidifying the conductor 3a into one body with varnish treatment. 10 is a pair of insulating channels fitted on both outer sides of the winding 3; 11;
is an insulating channel fitted to the inner circumference of winding 3, 1
Reference numeral 2 designates a pair of insulating pads 2 on which a large number of insulating spacing pieces 13 are arranged and adhered on the inner surface, and which are applied to both sides of the windings 3 to insulate adjacent windings 3. Although only a portion of the insulating spacing pieces 13 are shown in the figure, a large number of them are arranged at appropriate intervals over the entire surface of the winding 3, and they hold down the surface of the winding 3 and, as shown in FIG. 6, A flow path 14 for the refrigerant liquid 5 is formed between the spacer pieces 13.

In the conventional winding section configured as described above, the refrigerant liquid 5
is dispersed, flows down the flow path 14 along the surface of the winding 3 as shown by arrow B, and flows out from below the winding 3.

[Problem that the invention attempts to solve]

In the conventional gas insulated transformer as described above, winding 3
The refrigerant liquid 5 naturally flows down through the flow passages 14 formed between the respective insulating spacing pieces 13 applied to both sides of the
As shown in FIG. 5, at the upper and middle parts in the height direction, the water flowed inward as shown by arrow B, and it was difficult to flow towards both the outer sides, and at the lower part, it was difficult to flow towards the center. As described above, due to the uneven flow of the refrigerant liquid 5, the temperature distribution of the winding 3 becomes uneven, resulting in a problem that a high temperature rise point occurs.

To deal with this, and to make the refrigerant liquid 5 flow almost evenly over the surface of the winding 3, there is a plan to increase the number of insulating spacers 13 and arrange them in various shapes, but this is very complicated and the work is troublesome. There is a problem.

This idea was made to solve these problems, and it is a gas-insulated transformer that makes the flow distribution of the refrigerant liquid flowing down the winding surface evenly, and evens out the temperature rise distribution of the winding. The purpose is to obtain.

[Means for solving problems]

The gas-insulated electromagnetic induction device according to this invention has a plurality of guide plate pieces made of insulating plates inserted at four symmetrical positions on both the upper and lower sides between the turns of the conductor of the winding, and protrudes from the conductor on both sides in the width direction. The protruding dimension is made equal to the thickness of the insulating spacing piece applied to the surface of the winding, and the flowing refrigerant liquid is guided and spread by each guide plate piece.

[Effect]

In this invention, the refrigerant liquid sprayed from the refrigerant liquid distribution tray is guided and flowed down uniformly by the guide plate pieces inserted between the turns of the conductor of the winding, without concentrating on a specific part.

〔Example〕

FIG. 1 is a front view showing the winding part of a gas insulated transformer according to an embodiment of the invention, and shows 3, 3a, 1
0 to 14 are the same as the above conventional ones.
21 are the upper and lower sides 4 between the turns of the conductor 3a of the winding 3
These are arc-shaped guide plate pieces fitted in symmetrical positions.

A part of the winding 3 in which the guide plate piece 21 is sandwiched is shown in an enlarged sectional view in FIG. The guide plate piece 21 inserted between the turns of the conductor 3 a protrudes from the conductor 3 a on both sides in the width direction, and its protruding dimension is equal to the thickness of the spacing piece 13 . It touches the inside. A state in which the guide plate piece 21 is inserted is shown in a perspective view in FIG.

Insulating pads 12 on which spacer pieces 13 are arranged and adhered are applied to both sides of the winding 3 in this state. As a result, in the flow path 14 formed between the spacer pieces 13, the refrigerant liquid 5 is deflected and guided by each guide plate piece 21 at each arcuate bending portion of the winding 3.

A large number of spacing pieces 13 glued to an insulating patch plate 12
are spaced apart from the guide plate piece 21, and are mutually arranged so as not to obstruct the flow of the refrigerant liquid 5.

In the gas insulated transformer according to the embodiment in which the guide plate piece 21 is attached to the winding 3 as described above, the refrigerant liquid 5 sprayed from the upper refrigerant liquid distribution pan 4 is applied to the winding 3.
It passes through the flow path 14 formed by the surface, the spacing piece 13, and the insulating plate 12, and is guided by each guide plate piece 21 at both arcuate bends at the top, so that the surface of the winding 3 is not biased toward the center. It spreads all over the place like arrow C and flows down. The refrigerant liquid 5, which spreads out and flows almost uniformly down the middle part of the winding 3 in the height direction as shown by arrow D, is guided to each guide plate piece 21 of both circular arc bends on the lower side of the winding 3. , is guided again to the center side, flows out as shown by arrow E, and accumulates in the lower part of the tank 1. In this way, the winding 3, which conventionally had difficulty in flowing through the refrigerant liquid 5,
The refrigerant liquid 5 is reliably distributed near the straight outer periphery of the surface and in the center of the lower part.

Furthermore, in the above embodiments, a transformer was explained as the electromagnetic induction device of the gas-insulated electromagnetic induction device, but the present invention can also be applied to other types of devices such as a reactor.

[Effects of the invention] As described above, according to this invention, guide plate pieces made of insulating plates are inserted at symmetrical positions on both the upper and lower sides between the conductor turns of the winding, and thereby the refrigerant sprayed from above By guiding the liquid through the arcuate bends on both the upper and lower sides, the liquid is spread almost evenly over the entire surface of the winding, allowing it to flow downward without having to make complicated work on the spacing pieces as in the past. Cooled almost uniformly,
Local high heat generation is eliminated, and the amount of expensive refrigerant liquid used can also be reduced.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view showing the winding section of a gas insulated transformer according to an embodiment of this invention, Fig. 2 is an enlarged sectional view taken along the - line in Fig. 1, and Fig. 3 is the winding shown in Fig. 1. FIG. 4 is a schematic vertical sectional view showing the configuration of a gas insulated transformer, FIG. 5 is a schematic front view showing the winding section of a conventional gas insulated transformer, and FIG. 6 is an enlarged perspective view of a guide plate piece. 5 is an enlarged sectional view taken along the line - in FIG. 5. FIG. 1...tank, 2...iron core, 3...winding, 3a
...Conductor, 5...Cooling medium liquid, 12...Insulating patch plate, 13...Insulating spacing piece, 14...Flow path, 21
... Information board piece. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An electromagnetic induction device with windings installed vertically on an iron core is housed in a tank and filled with insulating gas, and both sides of the winding have inner A pair of insulating plates to which a number of insulating spacing pieces are fixed are applied to the insulating spacing pieces, and a flow path for a cooling medium liquid is formed between each of the insulating spacing pieces, and the cooling medium liquid is sprayed from above to fill the above flow path. In a gas-insulated electromagnetic induction device in which the conductor of the winding is cooled by flowing down along the winding surface, arc-shaped guides made of insulating plates are installed at four symmetrical positions on both sides of the upper and lower parts between the turns of the conductor of the winding. A gas-insulated electromagnetic induction device in which a plate piece is sandwiched between the windings and protrudes from both sides of the winding, and is in contact with the inner surface of the insulating cover plate, so that the cooling medium liquid is guided to spread over the surface of the winding and flow down. (2) The gas-insulated electromagnetic induction device according to claim 1, wherein the electromagnetic induction device is a transformer.