JPS644333B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to gas-insulated electric equipment, such as a transformer, which performs insulation cooling using a condensable refrigerant liquid and a non-condensable insulating refrigerant gas. The present invention relates to reactors and the like, and particularly relates to improvements in cooling devices for such gas-insulated electrical equipment.

[Prior art]

Below, we will explain a transformer as an example of gas-insulated electrical equipment.A conventional gas-insulated transformer has a
As shown in the figure, a transformer main body, that is, an electrical equipment main body 1 consisting of windings and an iron core is housed in a tank 2, and a non-condensable insulating gas such as SF ₆ gas and vapor of a refrigerant liquid are contained in the tank 2. A mixed refrigerant gas 3 and a refrigerant liquid 4 having evaporation and condensation properties within the operating temperature and pressure range are sealed. The tank 2 communicates with a refrigerant gas cooler 6, and a mixed gas circulation blower 5 is placed in this communication path. A refrigerant liquid circulation pump 7 is located at the lower part of the tank 2 and is connected by piping to supply refrigerant liquid to a refrigerant liquid distribution device 8, that is, a refrigerant liquid supply amount located at the upper part of the tank 2.

A conventional gas insulated transformer is configured as described above, and the refrigerant liquid 4 accumulated at the bottom of the tank is sprayed onto the transformer body 1 by the sprayer 8, and the sprayed refrigerant liquid is generated on the transformer body 1. Some of it evaporates due to heat loss (copper loss and iron loss), and some of it is transferred as the temperature of the liquid increases, and then reaches the bottom of the tank due to the weight of the liquid and the wind pressure of the blower 5 and accumulates again. Thereafter, the mixed gas 3 is sucked by the blower 5, cooled as it passes through the refrigerant gas cooler 6, and the heat generated by the transformer body 1 is released into the atmosphere. At the same time, the vapor of the refrigerant liquid is condensed and liquefied and returned to the lower part of the tank, and the gas is cooled down and is forced into the tank 2 via the blower 5. On the other hand, the refrigerant liquid 4 is again sprayed from the sprayer 8 to the transformer body 1 by the pump 7 . Thick arrow 9 indicates the gas feeding direction, and thin arrow 10 indicates the liquid feeding direction. The above-mentioned transformers focus on cooling through evaporation and condensation of refrigerant liquid, and are known as evaporative cooling type gas insulated transformers using the dispersion method (for example, Mitsubishi Electric Technical Report Vol. 1.56, No. 12). , 1982).

Furthermore, FIG. 2 shows another example of the conventional gas insulated transformer, in which the structure of the tank, pump 7, and sprayer 8 is the same as that of the first tank, except that the tank 2 is connected to the refrigerant liquid cooler 11. It is almost the same as the one shown in the figure.
Part of the refrigerant liquid sprayed onto the transformer body 1 by the sprayer 8 evaporates, and part of the liquid reaches the lower part of the tank 2 due to its own weight after the temperature of the liquid increases and heat is transferred from the body. The pump 7 then sends the liquid to the sprayer 8 again, but during this time it is cooled by the refrigerant liquid cooler 11 to lower the liquid temperature, and the heat generated in the transformer body is released into the atmosphere, and then again to the sprayer 8. The gas is sprayed from the main body 1 and the mixed gas 3 to cool it.
In this way, the gas insulated transformer shown in Figure 2 focuses on heat transfer due to the rise and fall of the refrigerant liquid temperature.
For example, it is known from the published patent publication No. 56-107527.

FIG. 3 shows a gas insulated transformer which is a combination of those shown in FIG. 1 and FIG. 2, and the members designated by numerals 1 to 12 are exactly the same as in FIGS. With this configuration, it has the features of the above two transformers,
A gas that performs cooling by using both the latent heat of vaporization of the refrigerant liquid and the sensible heat of the refrigerant liquid (heat exchange due to changes in liquid temperature).
It can be called a liquid cooled transformer. Transformer body 1
When the temperature of the mixed refrigerant gas 3 and the refrigerant liquid 4 is high, cooling by the refrigerant gas cooler 6 acts effectively, and conversely, when the temperature of the refrigerant is relatively low, the refrigerant liquid cooler 11 acts effectively. It has the characteristic of However, in the gas/liquid cooled transformer configured as shown in Fig. 3, the refrigerant gas cooler 6 and the refrigerant liquid cooler 11 are each made as separate units, so the installation space is large. There are drawbacks. A cooler for such a transformer is usually installed in the tank 2 and placed around the transformer. Point terminals, elephant cases, cable connections, tap changers, and operating mechanisms are arranged. Therefore,
When the space occupied by the cooler group increases, the degree of freedom in arranging other devices as described above is restricted, resulting in an increase in the circumferential length and floor area of the entire transformer. Although not shown in FIGS. 1 to 3, in the case of a transformer equipped with a fan for circulating the atmosphere in the refrigerant gas cooler 6 and the refrigerant liquid cooler 11, these fans are used for the refrigerant gas cooler, Since they are separated for use in refrigerant liquid coolers, the total number of fans increases, which has the disadvantage of increasing the number of auxiliary equipment and increasing noise.

[Summary of the invention]

This invention was made in view of the above-mentioned drawbacks of conventional gas/liquid cooled gas insulated electrical equipment. The purpose is to provide liquid cooled gas insulated electrical equipment. The gas-insulated electrical equipment of the present invention is characterized by being equipped with a gas/liquid cooler that integrates a mixed gas cooling section and a refrigerant liquid cooling section for exchanging heat generated in the equipment tank with the outside air, and the cooler is integrated. By doing so, it is possible to reduce the size and weight of the gas insulated electrical equipment, thereby making the entire gas insulated electrical equipment lighter and smaller, and to obtain a gas/liquid cooled electrical equipment with low auxiliary equipment loss and low noise.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

As shown in FIG. 4, in the present invention, the gas/liquid cooler 12 includes a mixed gas cooling section 12G and a refrigerant liquid cooling section 12L as an integral structure, and a common fan 13 is used to circulate the cooling air. I have to. The fan 13 may not be necessary. The mixed gas cooling section 12G is connected to the tank 2 through a pipe having a blower 5, and the refrigerant liquid cooling section 12L is connected to the tank 2 through a pipe having a blower 5.
The first point is that the lower part of the tank 2 is connected to the pipe having the same diameter, and the upper part is connected to the sprayer 8 in the tank 2.
This is similar to the conventional device shown in FIGS.

The inside of the gas/liquid cooler 12 is a mixed gas cooling section 1
2G and the refrigerant liquid cooling section 12L are arranged separately (in some cases, they are arranged together), the air is commonly circulated between them by the fan 13, and the mixed refrigerant gas is supplied to the mixed gas cooling section 12G. 3 flows, and the refrigerant liquid 4 flows into the refrigerant liquid cooling section 12L to perform cooling. Although not shown in FIG. 4, if a soundproof wind tunnel is required, this as well as the common fan 13,
It is commonly integrated and provided in the mixed gas cooling section 12G and the refrigerant liquid cooling section 12L.

In the gas/liquid cooler configured in this way, both the mixed gas cooling section and the refrigerant liquid cooling section are integrated, so the frame, mounting structure, etc. are simplified, and the weight of the cooler is reduced. Can be reduced. In addition, if a fan is used, the refrigerant liquid cooling section 12L
Since the heat transfer coefficient of the mixed gas cooling section 12G increases due to the temperature rise of the air passing through the mixed gas cooling section 12G, it is possible to reduce the cooling surface area or the number or capacity of fans. Therefore, the soundproof wind tunnel is also common, and by reducing the number of fans, it is possible to reduce the size, weight, and noise, reducing the total weight of the entire cooler and even the entire electrical equipment, reducing loss of auxiliary equipment, reducing noise, and reducing the installation space. A minor can be achieved.

In the embodiment shown in FIG. 4, the refrigerant liquid cooling section 12
The figure shows the case where L is placed upstream of the atmospheric circulation than the mixed gas cooling section 12G, but the ratio of gas cooling heat to liquid cooling heat may vary depending on the operating temperature of the electrical equipment, that is, the transformer, the type of refrigerant used, etc. depending on,
It goes without saying that the above arrangement may be reversed.

FIG. 5 shows another embodiment of the invention, with reference numeral 1
The members indicated by 13 are the same as those shown in FIGS. 3 and 4. The difference between the embodiment shown in FIG. 5 and the embodiment shown in FIG. 9) The mixed gas cooling section 12G and the refrigerant liquid cooling section 12L are arranged in the opposite direction, and the external piping is also arranged in such a way using a return circuit having a check valve 14. be.

With this configuration, the high-temperature part of the liquid and the low-temperature part of the gas are at the same height, and the low-temperature part of the liquid and the high-temperature part of the gas are at the same height, which averages out heat radiation to the outside air and improves efficiency. This has the effect of making cooling possible and further reducing the weight and size of the cooler. Note that the refrigerant liquid condensed in the mixed gas cooling section 12G flows into the refrigerant liquid reservoir at the bottom of the tank through a return circuit having a check valve 14 due to its own weight.

Although the above embodiments have been described as applied to gas-insulated gas/liquid-cooled transformers, it goes without saying that the present invention can also be applied to other gas-insulated electrical equipment such as reactors and capacitors.

〔Effect of the invention〕

As described above, according to the present invention, both coolers for electrical equipment that require both a gas cooler and a liquid cooler are integrated, a common fan is used, and a soundproof wind tunnel is also integrated. In addition to downsizing and reducing equipment installation area, it also has the effect of reducing auxiliary equipment loss and noise.

[Brief explanation of drawings]

Fig. 1 is a sectional view schematically showing an example of a conventional gas insulated transformer, Fig. 2 is a sectional view schematically showing another example of a conventional gas insulated transformer, and Fig. 3 is a gas/liquid cooled transformer. FIG. 4 is a sectional view schematically showing an embodiment of the gas insulated electrical equipment of the present invention, and FIG.
The figure is a sectional view of another embodiment of the invention. 1...Transformer body, 2...Tank, 3...Mixed refrigerant gas, 4...Refrigerant liquid, 5...Blower for mixed gas circulation, 6...Refrigerant gas cooler, 7...Pump for refrigerant liquid circulation , 8... Refrigerant liquid spreader, 9... Thick arrow indicating the gas feeding direction, 10... Thin arrow indicating the liquid feeding direction, 11... Refrigerant liquid cooler, 12... Gas/liquid cooler, 12G... ...Mixed gas cooling unit, 12L...Refrigerant liquid cooling unit, 13...Fan, 14...Check valve.
In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A main body of an electrical device, a tank that houses the main body, and a non-condensable refrigerant gas having an insulating property and an evaporative/condensable refrigerant gas sealed in the tank to cool the main body of the electrical device. In the gas-insulated electrical equipment, the gas-insulated electrical equipment includes a refrigerant liquid, a blower that circulates a mixed gas of the refrigerant gas and the vapor of the refrigerant liquid, and a pump and a supply device that circulates the refrigerant liquid and supplies it to the main body. A gas-insulated electric device comprising a gas/liquid cooler that is composed of the mixed gas cooling section and the refrigerant liquid cooling section that exchange generated heat with the outside air, and that integrates these. 2. The gas-insulated electrical equipment according to claim 1, wherein the gas/liquid cooler is equipped with a fan and a soundproof wind tunnel that are shared by the mixed gas cooling section and the refrigerant liquid cooling section. 3 Piping in which the gas/liquid cooler is equipped with a mixed gas cooling section and a refrigerant liquid cooling section in which the gas feeding direction and the liquid feeding direction are opposite to each other, and the refrigerant liquid condensed in the mixed gas cooling section is returned to the lower part of the tank. Claim 1, characterized in that it is provided with a return circuit consisting of a valve, etc.
Gas-insulated electrical equipment according to item 1 or 2.