JPS6018815Y2 - gas insulated induction electrical equipment - Google Patents

Description

[Detailed description of the invention] There is a growing trend for gas insulation to be used instead of oil insulation in induction electrical equipment such as transformers and reactors.

In the case of gas insulation, instead of using insulating oil, the insulating gas sealed in a sealed tank is sent to a cooler that is hermetically connected to the tank, and the insulating gas that has absorbed the heat generated by the induction electrical equipment is cooled and returned to the tank. Insulation and cooling methods such as pumping are used.

In this case, in order to increase the circulation of the insulating gas and the cooling efficiency of the insulating gas within the tank, a configuration as shown in the conventional example shown in FIG. 1 has been adopted.

That is, in the figure, 4 is a tank, and for example, a transformer main body 3 formed by winding a coil 1 around an iron core 2 is surrounded by a wind tunnel 8 in its lower half, and the wind tunnel 8 has a blow pipe on one side thereof. Although not shown, the end of the air pipe 5 is connected to a cooler, and the other end of the cooler is connected to the upper air pipe 5 at the upper side of the tank 4, and the air pipe 5 at the lower side is connected to the air pipe 5 at the upper side of the tank 4. The cooled insulating gas discharged from the wind tunnel 5 rises in the direction of the arrow from the wind tunnel 8, cools the coil 1, the iron core 2, and others, and is circulated through the air pipe 5 in the upper part to the cooler. .

When assembling gas-insulated induction electrical equipment with this configuration,
The blow pipe 5 on the lower side of the tank 4 is usually formed by abutting the blow pipe 5', which is formed integrally with the wind tunnel 8 in advance, and the flanges 9, 9' of the blow pipe 5, which are integrated with the side wall of the tank 4 by welding or the like. , tighten the bolts and connect.

However, the bolt tightening position is on the lower side of the tank 4, and in order to tighten the bolt, it is necessary to divide the tank 4 into upper and lower halves, or to provide a hand hole in the side wall of the tank. The positioning of the air pipes was difficult and assembly work took time.

In order to avoid the above-mentioned difficulties during assembly, the present invention uses a new gas configuration that does not require bolts to be tightened at the joints in the tank between the wind tunnel side blower pipe and the cooler side blower pipe. The present invention aims to provide insulated induction electrical equipment, particularly gas insulated induction electrical equipment with an improved insulating gas circulation system.

The embodiment shown in FIG. 2 will be described below.

The figures are partially sectional views.

8 is a wind tunnel, and 3 is a transformer body including, for example, a coil 1 and an iron core 2.

The wind tunnel 8 is formed integrally with a blow pipe 5' on one side thereof, and the blow pipe 5' has an expansion joint 6 interposed therebetween and ends at a flange 13'.

Inside the tank 4, the wind tunnel 8 surrounds the lower half of the transformer body 3.

As shown in the figure, the wind tunnel 8 and the transformer main body 3 are fixed in the tank 4, and an insertion hole 14 is provided in the side wall of the tank 4, facing the wind pipe 5' projecting from the wind tunnel 8, through which the wind pipe 5 passes.

The tip of the blow pipe 5 has a flange 13, and the flange 10 is placed at an appropriate position on the pipe of the blow pipe 5 so as to hold the blow pipe 5' under pressure when joined to the flange 13' as shown in the figure. The flange 10 is fixed by welding or the like, and the space between the flange 10 and the blower pipe 5 passing through the flange 10 is sealed.

Further, the flange 10 has a sufficient size to cover the insertion hole 14.

Pass the blow pipe 5 with the flange 10 fixed through the carrying hole 14, align the flange 13 at the tip of the blow pipe 5 with the flange 13' on the wind tunnel 8 side, and tighten the flange 10 against the tank 4. 13 presses the flange 13', and the connection of the air pipe 5.5' is completed.

At this time, it goes without saying that the flange 10 and the side wall of the tank 4 are tightened using a normal airtight sealing means.

For example, the surfaces of the flanges 13 and 13' may be formed with unevenness to facilitate mutual fitting, or rubber or the like may be adhered to the opposing surfaces to prevent gas leakage.

The cooler 11 and the blower 12 are arranged and installed between the other end of the air pipe 5 assembled in this way and the air pipe 5 that protrudes from the upper side of the tank and is bent downward, so as to prevent gas leakage. The entire pipeline is sealed.

The necessary wiring inside the tank is connected to a bushing (not shown), the tank is sealed with a lid, dried and degassed, and an insulating gas such as SF6 is sealed inside the tank.

In use, by energizing the blower and cooler, the insulating gas passes from the blower 12 through the lower air pipe 5° 5' and enters the wind tunnel 8, sufficiently filling the lower half of the transformer body 3 in the wind tunnel 8. The surrounding insulating gas passes from below to above the transformer body 3 as shown by arrow 7 to perform cooling, and the insulating gas that has absorbed heat reaches the cooler 11 from the upper blast pipe where it is cooled and circulated.

At this time, as already explained, the flanges 13° and 13' are not strongly connected with bolts, etc., but the flanges 13 and 13'
3 constantly presses the flange 13', there is almost no leakage of insulating gas, and even if there is leakage, it is within the tank.

The present invention has the configuration described above, and when connecting the blower pipe 5' protruding from the wind tunnel 8 and the blower pipe 5 on the cooler side, if the flange 13' is pressed with the flange 13, then both flanges are connected. It can be tightened in the joined state, and both flanges 13.
13' are connected, even if a force is applied to both blow pipes 5, 5, and 5' with their axial directions slightly shifted, there is no risk of them coming apart due to the function of the expansion joint, and bolt tightening within the tank is not necessary. work efficiency can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 shows an example of a conventional gas-insulated induction electric device, and FIG. 2 shows an embodiment of the gas-insulated induction electric device of the present invention, with a partial cross-sectional view. 1... Coil, 2... Iron core, 3...
...Transformer body, 4...Tank, 5,5'.
...Blow pipe, 6...Expansion joint, 7...
...Gas flow indicator line, 8...Wind tunnel, 9.
9'... Flange 1, 10... Flange, 11... Cooler, 12... Blower, 13, 13'... Flange , 14...
・Through hole, 15・Curved/uneven part.

Claims (1)

[Scope of utility model registration request] A blast pipe that is integrally installed in the wind trunk in the tank and has an expansion joint in the middle and flanges at both ends of the blast pipe that are fixed to a flange that covers an insertion hole in the tank wall are joined in a pressed state,
A gas-insulated induction electric device configured such that a cooler and a blower are disposed between an upper blower pipe and a blower tube that passes through the tank wall, and the main body of the induction electric device is cooled with an insulating gas.