JPH04336407A - Stationary induction apparatus - Google Patents

Abstract

PURPOSE:To maintain the emulsive condition at all times and prevent fluorocarbon emulsion from being separated in two layers by providing an agitator in one or two liquid pipes being arranged outside of a tank, and circulating the fluorocarbon emulsion inside the tank through the agitator. CONSTITUTION:An electrostatic inductor body 3 comprising a winding 1 and an iron wire 2 is stored in a tank 4. The tank 4 is filled with fluorocarbon emulsion 5. A heat radiator 7 and a pump 6 are provided for the tank 4 through pipes 8, and a pump 11 is provided between first liquid pipe 9A and a second liquid pipe 9B, and further an agitator 10 is interposed in the middle of the second liquid pipe 9B. Fluorocarbon emulism 5 is sent with the pump 6, and is cooled with the radiator 7. The fluorocarbon emulsion 5 is sent with a pump 11, and is agitated with the agitator 10. Thus, the fluorocarbon liquid 5 can be prevented from being separated in two layers.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to static induction electric appliances such as transformers and transformers that use a nonflammable insulating liquid as a refrigerant.

0002

[Prior Art] Mineral oil-based insulating oil, which has been widely used as an insulation and cooling medium for oil-filled stationary induction electric appliances, is flammable, so there is a strong desire to make it nonflammable from the standpoint of equipment disaster prevention. . Polychlorinated diphenyl (PCB) was first put into practical use as a nonflammable insulating liquid to replace mineral oil-based insulating oil.
), its cumulative toxicity became a problem and its use was completely banned. To this end, research and development efforts have been carried out in various places to find non-polluting, non-flammable insulating liquids.

[0003] As one type of nonflammable insulating liquid, it is known that a nonflammable insulating liquid can be obtained by impregnating a fluorocarbon liquid in a general insulating liquid, adding an emulsifier, and then stirring the mixture to form an emulsion. It has already been proposed by the same applicant as the present invention. By including several tens of percent of fluorocarbon liquid in an insulating liquid, the insulating liquid can be made completely nonflammable even if the insulator is flammable (hereinafter referred to as fluorocarbon emulsion). Fluorocarbon liquid alone is a completely non-flammable insulating liquid, but the specific gravity of fluorocarbon liquid is about twice that of mineral oil-based insulating oil, and its unit price is about two orders of magnitude higher than that of mineral oil-based insulating oil. The big drawback is that it is expensive. For this purpose, it was considered to mix it with other insulating liquids that have low specific gravity and low unit cost. However, fluorocarbon liquid is a chemically inert liquid;
The only things that can be dissolved are fluorocarbon-based ones and fluorocarbon-based ones like yourself. Therefore, a fluorocarbon emulsion is made by adding an emulsifier and making it possible to use it for insulation and cooling in an emulsion state in which both liquids are uniformly dispersed in the form of colloidal particles. On the other hand, non-flammable insulating liquids are required to be non-polluting and do not destroy the ozone layer, so to create a fluorocarbon emulsion that meets these requirements, for example, an ester-based insulating oil or silicone oil is mixed with a fluorocarbon liquid to form an emulsion. What has been developed has been developed.

0004

However, when the above-mentioned fluorocarbon emulsion is used as a refrigerant for a stationary induction appliance, there is a drawback that the emulsion undergoes specific gravity separation over time.

[0005] The emulsion state is a state in which both liquid particles, which have become colloidal particles, are dispersed via an emulsifier. Depending on the type of emulsifier, they can remain mixed for quite some time, but if the specific gravity of each liquid differs, the heavier ones will eventually move to the bottom layer and the lighter ones to the upper layer, separating into two layers. Therefore, in order to operate a stationary induction appliance for a long time, it is necessary to constantly stir the fluorocarbon emulsion.

An object of the present invention is to prevent separation of the fluorocarbon emulsion by constantly circulating the fluorocarbon emulsion in a tank via a stirrer.

[0007]

[Means for Solving the Problems] In order to achieve the above object, according to the present invention, a nonflammable insulating liquid is obtained by adding an emulsifier to an insulating liquid containing a fluorocarbon liquid to form an emulsion, and a nonflammable insulating liquid. a tank containing an insulating liquid main body; a pump disposed outside the tank for feeding the nonflammable insulating liquid; a first liquid pipe for guiding the nonflammable insulating liquid in the tank to the suction side of the pump; A second liquid pipe that guides the nonflammable insulating liquid on the discharge side of the pump into the tank, and a nonflammable insulating liquid that is interposed and guided in the middle or at the end of the first or second liquid pipe. In addition to this structure, a radiator is interposed in the middle or at the end of the first or second liquid pipe.

[0008]

[Operation] According to the structure of the present invention, a stirrer is provided in the middle or at the end of the first or second liquid pipe piped outside the tank, and the fluorocarbon emulsion, which is a nonflammable insulating liquid, is stirred in the tank. By circulating through the stirrer, the emulsion state is maintained at all times, and separation of the fluorocarbon emulsion into two layers can be prevented.

In addition to the above configuration, by interposing a radiator in the middle or at the end of the first or second liquid pipe, the liquid pipe of the fluorocarbon emulsion stirring system and the pipe of the cooling system can be connected. Can be used for both purposes.

0010

EXAMPLES The present invention will be explained below based on examples. FIG. 1 is a sectional view showing the configuration of a stationary induction appliance according to an embodiment of the present invention. A stationary induction electric appliance main body 3 consisting of a winding 1 and an iron core 2 is housed in a tank 4. The tank 4 is filled with a fluorocarbon emulsion 5. tank 4
A radiator 7 and a pump 6 are provided via piping 8, a pump 11 is provided between the first liquid pipe 9A and the second liquid pipe 9B, and a pump 11 is provided between the first liquid pipe 9A and the second liquid pipe 9B. A stirrer 10 is interposed therein. The fluorocarbon emulsion 5 is sent by the pump 6 in the direction of the arrow of the liquid flow 6A, and is cooled by the radiator 7. On the other hand, the fluorocarbon emulsion 5 is fed by the pump 11 in the direction of the arrow of the liquid flow 11A and stirred by the stirrer 10, thereby preventing the fluorocarbon emulsion 5 from separating into two layers.

FIG. 2 is a partially exploded perspective view showing the configuration of essential parts of the agitator 10 of FIG. 1. As shown in FIG. The front side of the circular tube 12 connected halfway to the second liquid tube 9B in FIG. 1 is partially broken to show the internal twisting blades 13A and 13B. This twisted blade 13A,
13B is fixed to the inner wall of the circular tube 12 via a support (not shown) so as not to rotate. The left and right ends of each blade are twisted 180 degrees with respect to each other, and the twisted blades 13A and 13B are arranged so that the directions of the opposite blades are shifted from each other by 90 degrees. When the liquid stream 11A of the fluorocarbon emulsion flows into the circular tube 12 from the right end in FIG. 2, the fluorocarbon emulsion flows toward the exit at the left end of the circular tube 12 while being stirred by the twisting blades 13A and 13B. FIG. 2 shows what is called a static pipe agitator (or static mixer), which is generally commercially available. Some configurations have even more twisted blades than the configuration shown in FIG. 2, allowing the fluorocarbon emulsion to be stirred more uniformly.

FIG. 3 is a sectional view showing the structure of a stationary induction appliance according to a different embodiment of the present invention. Winding 1 and core 2
A stationary induction electric appliance main body 3 consisting of the following is housed in a tank 4. The tank 4 is filled with a fluorocarbon emulsion 5. A pump 11 and a radiator 14 are provided between the first liquid pipe 15A and the second liquid pipe 15B, and a stirrer 1 having the configuration shown in FIG.
0 is inserted. The fluorocarbon emulsion 5 is fed by the pump 11 in the direction of the arrow of the liquid flow 11A, cooled by the radiator 14, and stirred by the stirrer 10 to prevent the fluorocarbon emulsion 5 from separating into two layers. can.

The configuration shown in FIG. 3 differs from that shown in FIG. 1 in that the fluorocarbon emulsion 5 can be cooled and stirred by circulation within one piping system. It can also be used as a pump for liquid delivery.

FIG. 4 is a sectional view showing the structure of a stationary induction appliance according to still another embodiment of the present invention. The stationary induction electric appliance main body 21 is composed of an iron core 20 and a winding 19 housed in an insulating tank 18 and wound around the iron core 20.
It is stored inside. The insulating tank 18 is filled with a fluorocarbon emulsion 22, and the outside of the insulating tank 18 is filled with SF6 gas 17. First and second liquid pipes 16A
, 16B are provided to communicate with the inside of the insulating tank 18, and the radiators 14, 16B are provided outside the tank 4.
It is connected to a pump 11 and an agitator 10 having the configuration shown in FIG.

The configuration of FIG. 4 is different from that of FIG. 3 in that the tank 4 seals the SF6 gas 17 and the insulating tank 1
A point 8 separates the SF6 gas 17 and the fluorocarbon emulsion 22. The fluorocarbon emulsion 22 is sent by the pump 11 in the direction of the arrow of the liquid flow 11A,
It is possible to effectively cool only the winding 19, which is a heating element, and to prevent the fluorocarbon emulsion 22 from separating into two layers.

The configuration shown in FIG. 4 has traditionally been called a separate type, and its unit cost is extremely high (currently about 2 times the unit price of mineral oil).
The amount of fluorocarbon liquid, which has a high specific gravity (approximately twice that of mineral oil), was reduced as much as possible, and the dielectric strength of SF6 gas 17 was used as tank insulation. A fluorocarbon emulsion 22 is placed in place of the fluorocarbon liquid, and while being stirred by a stirrer 10, heat from the winding 19 is discharged by a radiator 14. With this configuration, the unit price of the refrigerant for the winding 19 can be further reduced, and the weight of the refrigerant can also be reduced.

FIG. 5 is a sectional view showing the structure of a stationary induction appliance according to still another embodiment of the present invention. A stationary induction electric appliance main body 26 is composed of a winding 24 and an iron core 25,
It is stored in a tank 23. A pump 27 is connected to the first and second liquid pipes 30A and 30B that communicate with the tank 23.
A heat radiator 28 and a stirrer 31 having the configuration shown in FIG. 2 are interposed. The tank side of the second liquid pipe 30B is equipped with a sprayer 31 (having a large number of through holes on the lower surface) for spraying the fluorocarbon emulsion 29, and the first liquid pipe 30
One end of A is attached to the lower part of a liquid reservoir 33 which is arranged at the bottom of the tank 23 and where the fluorocarbon emulsion 29 is temporarily collected.

In FIG. 5, a pump 27 pumps a fluorocarbon emulsion 29 in the direction of the arrow of a liquid flow 27A. The sprayer 31 sprays the fluorocarbon emulsion 29 into raindrops onto the stationary induction appliance body 26. The fluorocarbon emulsion 29 cools the winding 24, which is a heating element, while falling, and then collects in a reservoir 33 at the bottom of the tank. The pump 27 sucks up the fluorocarbon emulsion 29 in the liquid reservoir 33 and radiates the heat using the radiator 28, and the agitator 31 prevents the fluorocarbon emulsion 29 from separating into two layers.

The configuration shown in FIG. 5 has conventionally been called an evaporative cooling type, and the amount of the fluorocarbon liquid, which is extremely expensive, is reduced as much as possible, and the winding 2 is heated by the latent heat of evaporation of the fluorocarbon liquid.
4 was effectively cooled. A portion of the fluorocarbon liquid is temporarily evaporated by the heat of the winding 24 during the fall, but is cooled by the surrounding tank 23 and liquefied again and enters the liquid reservoir 33. By using fluorocarbon emulsion 29 in place of conventional fluorocarbon liquid, winding 24 can be cooled in exactly the same manner as in the prior art. This embodiment makes it possible to further reduce the unit price of the refrigerant for the winding 24, and also to reduce the weight of the refrigerant.

The stirrers shown in FIGS. 1, 3, 4, and 5 are all of the static type shown in FIG. It may also be constructed using a colloid mill or the like. In addition, although the configuration in FIG. 1 is a forced oil feed type equipped with a pump 6 and a radiator 7, the configuration without the pump 6 and radiator 7 in FIG. Even in the case of ), separation of the fluorocarbon emulsion 5 can be prevented by providing the pump 11 and stirrer 10 on the right side.

[0021]

Effects of the Invention As described above, the present invention provides a stirrer in the middle or at the end of the first or second liquid pipe piped outside the tank, and allows the fluorocarbon emulsion in the tank to be mixed through the stirrer. By circulating the fluorocarbon emulsion, an emulsion state is maintained at all times, and separation of the fluorocarbon emulsion into two layers can be prevented.

In addition to the above configuration, by interposing a radiator in the middle or at the end of the first or second liquid pipe, the liquid pipe of the fluorocarbon emulsion stirring system and the pipe of the cooling system can be connected. It can be used for both purposes, making it possible to reduce costs.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the configuration of a stationary induction electric appliance according to an embodiment of the present invention.

[Fig. 2] A partially exploded perspective view showing the main part configuration of the agitator shown in Fig. 1.

FIG. 3 is a sectional view showing the configuration of a stationary induction electric appliance according to a different embodiment of the present invention.

FIG. 4 is a sectional view showing the configuration of a stationary induction appliance according to still another embodiment of the present invention.

FIG. 5 is a sectional view showing the configuration of a stationary induction appliance according to still another embodiment of the present invention.

[Explanation of symbols]

1 Winding wire 19 Winding wire 24 Winding wire 2 Iron core 20 Iron core 25 Iron core 3. Stationary induction appliances 21　　　Stationary induction electric appliance 26 Stationary induction appliances 4 Tank 23 Tank 5 Fluorocarbon emulsion 22 Fluorocarbon emulsion 29 Fluorocarbon emulsion 6 Pump 11 Pump 27 Pump 7 Heat sink 14 Heatsink 28 Heatsink 8 Piping 9A First liquid pipe 15A First liquid pipe 16A First liquid pipe 30A First liquid pipe 9B Second liquid pipe 15B Second liquid pipe 16B Second liquid pipe 30B Second liquid pipe 10 Stirrer 31 Stirrer 12 Circular tube 13A Twisted blade 13B Twisted blade 17 SF6 gas 32 SF6 gas 33 Liquid reservoir 6A Liquid flow 11A Liquid flow 27A Liquid flow 18 Insulation tank

Claims (2)

[Claims] Claim 1: A tank containing a stationary induction electric appliance body together with a non-flammable insulating liquid made by adding an emulsifier to an insulating liquid containing a fluorocarbon liquid, and a non-flammable insulating liquid disposed outside the tank. a pump for sending a liquid; a first liquid pipe for guiding the nonflammable insulating liquid in the tank to the suction side of the pump; and a second liquid pipe for guiding the nonflammable insulating liquid on the discharge side of the pump into the tank. A stationary induction electric appliance comprising a liquid pipe and a stirrer that stirs a nonflammable insulating liquid that is inserted and guided in the middle or at the end of the first or second liquid pipe. 2. A stationary induction electric appliance according to claim 1, characterized in that a radiator is interposed in the middle or at the end of the first or second liquid pipe.