JPH025525Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to electrical equipment that is cooled by dispersing liquid refrigerant.

An example of this type of electrical equipment is an evaporatively cooled gas insulated transformer. This is a transformer whose purpose is to save resources and energy by making the device lighter and smaller, and to improve environmental friendliness by being oil-free and non-flammable. Figures 1 and 2 are a sectional view and a partially transparent perspective view, respectively, showing the overall structural concept of a conventional evaporative cooling type gas insulated transformer, taking an external steel transformer as an example. - is an enlarged cross-sectional view of the line. In the figure, 1 is a sealed container, 2 is a plate-shaped winding arranged in the container 1 with the plate surface perpendicular, and 3 is an iron core arranged to interlink with the winding 2. , 4 is an insulating member made of a press board or the like disposed between the windings 2 and between the windings 2 and the iron core 3. Then, the winding 2, the iron core 3, the insulating member 4
and a lead wire (not shown) connected to the winding 2 constitutes a transformer main body 5. 6 is the transformer body 5
sealed in container 1 to cool the heat generating part of
A liquid refrigerant made of fluorine-based compounds such as C ₈ F ₁₆ O and C ₂ Cl ₃ F ₃ , which is forcibly circulated in the direction of arrow 8 by a pump 7 and sent to the dripping device via a refrigerant liquid cooler 9. 10 to the upper surface 5a of the transformer main body 5. Reference numeral 11 denotes an insulating medium sealed in the container 1 to insulate the live part of the transformer body 5, for example.
It is composed of a gas mixture of an insulating gas such as SF ₆ gas and steam vaporized by cooling the heat-generating portion of the transformer body 5 with the dispersed refrigerant. 12 is a blower that forcibly circulates the insulating medium 11 in the direction of arrow 14 via the gas cooler 13. Reference numerals 15 and 16 denote an insulating barrier and an insulating washer respectively arranged to surround the winding 2, which constitute a part of the insulating member 4, and which are connected to a cooling duct 17 formed along the surface of the winding 2. It has holes 15a and 16a. 18 is a support spacer that supports the windings 2 at regular intervals.

Next, the cooling operation of the conventional evaporative cooling type gas insulated transformer configured as described above will be explained.
First, since the refrigerant that has passed through the dripping device 10 is almost uniformly distributed over the upper surface 5a of the transformer main body 5 as a whole, the necessary cooling of the heat generating parts including the widely disposed lead wires is ensured. Particularly in the second part of the winding where the heat generation density is high, as shown in FIG. The winding 2 is cooled by passing through the winding. The refrigerant vaporized by the cooling of the above-mentioned parts is condensed by the gas cooler 13, returns to the container 1 in the direction opposite to the arrow 14, becomes a liquid refrigerant 6, and is again used for cooling.

However, in the conventional evaporative cooling type gas insulated transformer as described above, as shown in Fig. 3,
The sprayed refrigerant also flows to parts other than paths A and B, for example, to the path (path C) formed by the support spacer 18, but the refrigerant in this part does not contribute to cooling the winding 2, so as a result, the refrigerant is It is necessary to circulate a larger amount than is truly necessary for cooling, which has the drawback of increasing the size of the pump 7 and increasing loss of auxiliary equipment.

This idea was made to eliminate the drawbacks of the conventional ones, and by providing a refrigerant receiver that receives a portion of the sprayed refrigerant and directs it to the cooling duct, it reduces the amount of refrigerant circulated. The object of the present invention is to provide an electrical device that can downsize auxiliary equipment for refrigerant circulation and reduce auxiliary equipment loss.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIG. 4 is an enlarged sectional view showing the vicinity of the winding end of an evaporative cooling type gas insulated transformer in one embodiment to which this invention is applied. In the figure, winding 2, insulation barrier 15, insulation washer 16, cooling hole 15
a, 16a, cooling duct 17, support spacer 18
Since it is the same as the conventional case, the explanation will be omitted.
Reference numeral 19 denotes a refrigerant receiver made of, for example, an insulator and having a U-shaped cross section, which once receives the dispersed refrigerant and leads it out to the cooling duct 17 from an outlet hole 19a provided at the bottom. The contact surfaces 20 are attached to the insulating barrier 15 and the insulating washer 16 by aligning the contact surfaces 20 with insulating strings (not shown) or by fixing them with adhesive.
Reference numeral 21 denotes a spacer inserted between the outer circumferential surface of the winding 2 and the inside of the insulation barrier 15 as necessary.
is strengthening its support.

In the evaporative cooling type gas insulated transformer according to one embodiment of the invention configured as described above, a portion of the sprayed refrigerant flows through the iron core 3, as in the conventional case.
While the lead wires etc. are directly cooled, the remaining part of the sprayed refrigerant is once received by the refrigerant receiver 19 and flows into the cooling duct 17 through the outlet hole 19a and the cooling holes 15a and 16a, as in the conventional case. Since there is almost no flow to paths other than the cooling duct 17, such as the path C, the winding 2 can be cooled more uniformly, and the amount of circulation of the liquid refrigerant 6 can be reduced as a whole. The pump 7 can be made smaller and its power consumption can be reduced.

FIG. 5 is an enlarged sectional view showing the vicinity of the winding end of an evaporative cooling type gas insulated transformer in another embodiment to which this invention is applied, and the refrigerant receiver 19 corresponds to the difference in height of the winding 2. The contact surfaces 22 of adjacent refrigerant receivers 19 are fixed to each other by binding with insulating strings (not shown) or with adhesive. In this case, it is possible to more completely prevent the sprayed refrigerant from flowing outside the cooling duct 17, and the amount of circulating liquid refrigerant 6 can be further reduced.

In each of the above embodiments, the outer iron structure of an evaporative cooling type gas insulated transformer was explained as an example, but it may also be applied to an inner iron structure or a cooling method for electrical equipment other than transformers, such as a reactor. The same can be applied, and the refrigerant may be sprayed not only in a dripping manner but also in a spraying manner.

As explained above, this device is equipped with a refrigerant receiver that receives a portion of the sprayed refrigerant and directs it to the cooling duct, thereby preventing the refrigerant discharged from flowing into parts other than the cooling duct. This has the effect of reducing the amount of refrigerant circulation, downsizing auxiliary equipment for refrigerant circulation, and reducing loss of auxiliary equipment.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the overall structural concept of a conventional evaporative cooling type gas insulated transformer, Fig. 2 is a partially transparent perspective view, Fig. 3 is an enlarged sectional view taken along the - line in Fig. Figure 4 is an enlarged sectional view of the vicinity of the winding end of an evaporative cooling type gas insulated transformer in one embodiment to which this invention is applied, and Figure 5 is an enlarged sectional view of the winding end of another embodiment to which this invention is applied. It is an enlarged sectional view of the vicinity. In the figure, 1 is a container, 5 is a transformer main body as an equipment main body, 6 is a liquid refrigerant, 10 is a dripping device as a dispersion means, 17 is a cooling duct, and 19 is a refrigerant receiver. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A dispersion means for dispersing a liquid refrigerant into a container is disposed above the winding end of the main body of the electrical equipment, each predetermined winding being closely fixed to each other, and the refrigerant sprayed by the above-mentioned dispersion means is A refrigerant receiver that once receives the refrigerant and leads it out to the outside from a plurality of outlet holes provided at the bottom; and 1. An electrical device comprising: a cooling duct through which the sprayed refrigerant flows; and a device main body cooled by the sprayed refrigerant and the refrigerant flowing through the cooling duct.