JPH08138946A - Gas-insulated static induction equipment - Google Patents

Abstract

PURPOSE: To enable a gas-insulated static induction equipment to be set compact in structure and lessened in cost by a method wherein upper spaces and lower spaces inside single-phase equipments are connected together with an upper communicating tube and a lower communicating tube respectively, and a cooling device is connected to at least either of the upper and the lower communicating tube. CONSTITUTION: A gas-insulated static induction equipment is filled with insulating gas 4, and three single-phase equipment tanks 1 each housing a static induction equipment main body are arranged like a triangle to form a three-phase equipment. The single-phase equipment tank 1 is partitioned into an upper space and a lower space with a gas stopping plate which extends from the outermost surface of a winding wire 3 to the inner surface of the tank 1. The upper spaces of the three tanks 1 are connected together with an upper communicating tube 11a, and the lower spaces are connected together with a lower communicating tube 11, whereby the three single-phase tanks 1 are formed into one piece. A cooling device composed of one or a few blowers 7 and a cooler 6 is connected to all the three upper and lower communicating tubes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated transformer for cooling by circulating a refrigerant such as SF6 gas, or a gas-insulated static induction generator such as a gas-insulated reactor.

[0002]

2. Description of the Related Art A conventional example of a gas-insulated static induction machine will be described with reference to FIGS. As shown in the figure, the static induction body is housed in each of the three tanks 1 together with an insulating gas 4 such as SF6 gas, and a gas stop plate 5 is provided between the outermost circumference of the winding 3 and the inner surface of the tank 1. It is provided. A plurality of coolers 6 for cooling the insulating gas outside the tank 1.
And a plurality of blowers 7 for circulating an insulating gas such as SF6 gas. Common pipes 8a and 8b are provided between the three tanks 1 and the plurality of coolers 6 and the blower 7,
A tank upper pipe 9a and a tank lower pipe 9c for connecting the tank 1 to the common pipes 8a and 8b are provided, and a cooling device upper pipe 9b and a cooling device lower pipe 9d for connecting the common pipes 8a and 8b to the cooler 6 and the blower 7 are provided. Is equipped with. Then, the three tanks 1 are electrically connected to form one gas-insulated static induction generator such as a three-phase transformer.

The insulating gas 4 cooled by the plurality of coolers 6 is joined by the blower 7 from the cooling device lower pipe 9d to the lower common pipe 8b, and then branched to the tank lower pipe 9c and sent to the lower part of the tank 1. . Since the winding 3 and the tank 1 are partitioned by the gas stop plate 5, the insulating gas flowing into the tank 1 is divided into the iron core 2 and the gas passages provided inside the winding 3, respectively. And the coil 3 ascending while cooling, and from the upper part of the tank 1 to the tank upper piping 9
To join the upper common pipe 8a, branch to the cooling device upper pipe 9b, and return to the cooler 6 and the blower 7.
As a result, the device body including the iron core 2 and the winding wire 3 is cooled by the insulating gas 4. Such a common piping system is adopted to allow the insulating gas to flow relatively uniformly to each tank even when the number of blowers to be operated is reduced due to the load condition of a transformer or the like.

[0004]

By the way, in the gas-insulated static induction machine having the above structure, the gas blown out from a plurality of blowers is once merged in the lower common pipe 8b, and then split into each tank 1. However, in the case where the cooling device upper pipe 9b and the cooling device lower pipe 9d from the blower 7 or the tank upper pipe 9a and the tank lower pipe 9c from the tank 1 are installed at one position of the common pipes 8a and 8b. , The balance of the flow rate to each tank 1 deteriorates, and the flow rate tends to decrease in a certain tank. Furthermore, when some of the plurality of blowers 7 fail, not only the total amount of circulating insulating gas decreases, but
There is a drawback in that the flow rate balance is further deteriorated due to the position of the blower 7 that has failed.

In such a case, the temperature of the winding housed in the tank having the smallest inflow rate becomes excessively high as compared with the windings in the other tanks, and therefore it is necessary to perform a cooling design in consideration of this. is there. For example, measures such as increasing the size of the winding to reduce the amount of heat generation, or increasing the number of blowers and coolers can be considered, but such measures have the drawback of increasing the size of the device. It is also possible to increase the diameter of the common pipe to make the resistance of the insulating gas flow in the common pipe small and uniform, and to improve the flow balance, but again the equipment becomes large and the installation area becomes large. There are drawbacks. Also, if the ratio of the external cooling system is large, the layout of the equipment in the substation will be restricted,
The layout may be complicated, and the gas-insulated static induction device may not fit in the installation space. In addition, there is a drawback that the cost increases due to the expansion of the installation space of the substation.

The present invention has been made in view of the above circumstances, and its purpose is to make a device compact and low in cost, and further to have a high degree of freedom in layout and a gas-insulated static induction with higher cooling reliability. It is to provide electric appliances.

[0007]

In order to achieve the above-mentioned object, the first aspect of the present invention is to construct a three-phase device by arranging three single-phase device tanks containing a stationary induction body and insulating gas. Furthermore, in a gas-insulated static induction machine provided with a plurality of coolers and blowers for forcing and cooling circulation of the insulating gas, the single-phase tanks are arranged in a triangle, and from the outermost circumference of the winding in each single-phase tank. The upper surface and the lower space of the single phaser tank are partitioned by a gas stop plate to form an upper space and a lower space, and the upper space and the lower space in the three single phasers are connected by an upper communication pipe and a lower communication pipe, respectively, A cooling device including a cooler and a blower is connected to at least one of the upper and lower communication pipes.

[0008]

According to the gas-insulated static induction electric device of the present invention, even if some of the blowers are out of order or a plurality of transformer tanks and the blowers are connected to each other with a bias, a uniform gas flow rate is made to flow in each tank. In addition, the total distance of the gas pipes can be shortened compared with the conventional one, and the installation area of the main tank and the space occupied by the external cooling device can be reduced, so that the gas can be made compact, low cost, and have improved cooling reliability. It becomes possible to provide an insulating static induction electric device.

[0009]

Embodiments of the present invention will be specifically described below with reference to the drawings. 1 is a plan view of a first embodiment of a gas-insulated static induction generator according to the present invention, and FIG. 2 is a bird's-eye view with a part of FIG. 1 deleted. As shown in the figure, the gas-insulated static induction electric machine according to the present embodiment comprises three single-phase tanks 1 filled with insulating gas 4 and accommodating the main body of the static induction electric machine arranged in a triangular shape to form a three-phase electric machine. I am configuring. Further, in each single-phase tank 1, the outermost circumference of the winding 3 to the inner surface of the tank is partitioned by a gas stop plate 5 to form an upper space and a lower space. The three single-phase tanks 1 are integrated by connecting the spaces to each other by the upper communication pipe 11a and the lower communication pipe 11b. One or several blowers 7 for all three of these vertical communication pipes
And a cooling device 10 including a cooler 6 is connected.

In the gas-insulated static induction machine constructed as described above, the insulating gas 4 cooled by the plurality of coolers 6 is cooled by the cooling device 10 and the blower 7.
Through the cooling device pipe 12, and then the lower communication pipe 1
It flows to 1b and is sent to the lower part of the tank 1. Here, the winding 3 and the tank 1 are partitioned by the gas stop plate 5, so that the insulating gas 4 flowing into the tank is separated from the iron core 2 and the winding 3.
Flow into the gas passages provided in the interior of the tank, rise while cooling the iron core 2 and the winding 3, and flow from the upper part of the tank 1 through the upper communication pipe 11a to the cooling device pipe 12,
Return to the cooler 6 and the blower 7.

Here, the three transformer tanks 1 are integrated by an upper communication pipe 11a and a lower communication pipe 11b, respectively, and the amount of gas flowing into each tank 1 is substantially uniform, and between the tanks 1. There is almost no variation in the flow rate. If one blower 7 stops, the balance of gas inflow in the three tanks 1 deteriorates, but the upper spaces of the three tanks 1 and the lower spaces of the three tanks 1 are connected by the pipes 11a and 11b, respectively. Therefore, the blower 7 is stopped from the tank having a large flow rate and the gas flows to the tank having a small flow rate. As a result, the pressure difference between the lower space and the upper space in the three tanks is kept uniform, and the gas flow rates flowing into the iron core 2 and the winding 3 are also made uniform.

Therefore, it is possible to minimize the variation in the flow rate to each tank. As a result, even if one blower is stopped, a uniform gas flow rate can be applied to each tank. Further, the total distance of the cooling gas pipes can be shortened as compared with the conventional case. That is, it is possible to reduce the space occupied by the gas pipe, the main body tank installation area, and the external cooling system, and to realize compactness and cost reduction. Further, cooling reliability is also improved.

FIG. 3 is a plan view of a second embodiment of the present invention. The difference of this embodiment from the first embodiment is that two of the three upper and lower communicating pipes 11 are the upper and lower communicating pipes 11. Since only the cooling device 10 including a cooler and a blower is connected to the above and other points are the same, duplicate description will be omitted. This embodiment also has the same effect as the first embodiment.

FIG. 4 is a plan view of a third embodiment of the present invention. The difference of this embodiment from the first embodiment is that one of the three upper and lower communicating pipes 11 is an upper and lower communicating pipe 11. Since only the cooling device 10 including a cooler and a blower is connected to the above and other points are the same, duplicate description will be omitted. Compared with the first embodiment, this embodiment has an effect that the cooling water piping equipment of the cooler can be simplified and the entire installation space can be further reduced.

FIG. 5 is a plan view of a fourth embodiment of the present invention. The difference of the present embodiment from the first embodiment is that the upper and lower communication pipes 11 are gathered at one central place and the merge pipe 13 is provided. Connecting. Further, the cooling pipe 10 including a cooler and a blower is connected to the confluent pipe 13 only at the connection point, and the other points are the same, and thus the duplicated description will be omitted. This embodiment can minimize the entire installation space as compared with the first embodiment. Other effects are the same as those of the first embodiment.

[0016]

As described above, according to the gas-insulated static induction machine of the present invention, a uniform gas flow rate can be supplied to each tank even when several blowers are stopped. Furthermore, the total distance of the cooling gas pipes is shorter than in the past, and it is possible to reduce the space occupied by the gas pipes, the main tank, and the external cooling device, which is compact, low-cost, and cooling reliability is further improved. It has an excellent effect.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment of the present invention.

FIG. 2 is a bird's-eye view with a part of FIG. 1 deleted.

FIG. 3 is a plan view of a second embodiment of the present invention.

FIG. 4 is a plan view of a third embodiment of the present invention.

FIG. 5 is a plan view of a fourth embodiment of the present invention.

FIG. 6 is a plan view of a conventional gas-insulated static induction generator.

FIG. 7 is a schematic side sectional view of FIG.

[Explanation of symbols]

1 ... Transformer tank, 2 ... Iron core, 3 ... Winding wire, 4 ... Insulating gas, 5 ... Gas stop plate, 6 ... Cooler, 7 ... Blower, 8a.
Reference numeral 8b ... Common piping, 9a ... Tank upper piping, 9b ... Cooling apparatus upper piping, 9c ... Tank lower piping, 9d ... Cooling apparatus lower piping, 10 ... Cooling apparatus, 11a ... Upper communication piping, 1
1b ... lower communication pipe, 12 ... cooling device pipe, 13 ... merging pipe.

Claims (1)

[Claims] 1. A gas provided with a plurality of coolers and blowers for arranging three single-phase tanks containing a stationary induction body and insulating gas to form a three-phase device, and further forcing and circulating the insulating gas. In the insulated static induction machine, the single-phase tanks are arranged in a triangular shape, and in each of the single-phase tanks, an upper space and a lower space are partitioned by a gas stop plate from the outermost circumference of the winding to the inner surface of the single-phase tank. The upper space and the lower space in the three single-phase units are connected by an upper communication pipe and a lower communication pipe, respectively, and a cooling device including a cooler and a blower is connected to at least one of the upper and lower communication pipes. A gas-cooled stationary induction electric device characterized by the above.