JPS6153706A - Prevention device for oil deterioration in oil immersed electric apparatus - Google Patents

Abstract

PURPOSE:To simplify assembling and disassembling works and attempt improvement in safety by fixing an inverted L-shaped stand to a side plate of a lower tank of an oil immersed electric apparatus and mounting the stand so as to position its outside line on the outside of a vertical line to a cut-edge of an upper tank. CONSTITUTION:A vertical side member 13a of an inverted L-shaped stand 13 is fixed to the other side of a side plate 2a of a lower tank 2. A prevention device for oil deterioration 7 is fixed to a horizontal side member 13b of the stand 13 and a side face 17 of the device 7 is mounted so as to position thereof on the outside of the cut-edge of a transformer tank 1. The device 7 is connected to an upper tank 3 via a pipe 7a. Consequently, works for removing the tank 3 do not need removal of the device 7, which allows disassembling and assembling works to be simplified and time required for the works to be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in the mounting position of an oil deterioration prevention device mounted on an oil-filled electric appliance.

[Technical background of the invention and its problems]

Conventionally, in oil-filled electrical appliances such as transformers and accelerators, such as large-capacity transformers, the high-voltage bushing is placed on the top of the transformer cover, and the oil deterioration prevention device is installed directly on the top of the upper tank of the transformer. The upper surface of the upper tank of the transformer (= a seat fixed by welding is provided, and this seat (: attaching the mount for the oil deterioration prevention device to the bolt 1; (Two-oil deterioration prevention device!
The installation was structured to be fixed.

Such a conventional structure is shown in FIGS. 3 and 4. That is, transformer tank 1 is connected to lower tank 2 and upper tank 3.
The main body of the transformer, shown by the dotted line, is housed in a lower tank 2.
One side of a long mounting base 6 is fixed to the seat 5 which is fixed to f'. The other side of the mounting base 6, that is, the part C protruding from the upper tank 3: Attach the oil deterioration prevention device 7. Then, connect the oil deterioration prevention device 7 and the upper tank 3 with the piping 7a. Installation, connect the oil cooling system 9 and this C: related oil pipe 1 (J, air vent, and piping 11) and assemble.Although not shown, all other accessories are installed and the complete assembly is complete. After 2 hours, the entire pressure transformer was emptied and lubricated.The Z0 transformer main body 4 was partially dried before being stored in the lower tank 3 to reduce its moisture content. As mentioned above, the insulation properties of the transformer body 4 were adversely affected by moisture absorption and adhesion of floating dust due to the long exposure to the atmosphere before lubrication. A spare winding is attached, and if it is necessary to replace the winding at the site after the start of operation, or if it is necessary to lift the transformer body and replace it, install it on the top surface of the upper tank 3 before lifting the transformer body. It is necessary to remove the bushing 8, the wiring WIO, 11, 7a, the pedestal 6, the oil deterioration prevention device 7, etc., which have been removed, which not only increases the cost of this work C1, but also reduces the exposure time of the transformer body 4 to the atmosphere. The problem is that the time becomes longer and the same negative effect as when fully assembling the transformer described above occurs.

Furthermore, since work is often carried out on the upper surface of the upper tank 3, which has a curved surface, there is another problem that is undesirable from the standpoint of worker safety.

[Purpose of the invention]

The present invention has been made in consideration of the above At, and its purpose is to minimize the deterioration of the insulation properties of the oil-filled electrical equipment body, and further reduce the total cost of assembling and disassembling the oil-filled electrical equipment. Another object of the present invention is to provide an oil deterioration prevention device for oil-filled electrical appliances that improves safety during assembly and disassembly work by reducing work on the upper surface of the upper tank.

[Summary of the invention]

In order to achieve such an object, the present invention (second invention) is to attach one vertical side of a gantry-shaped pedestal to the side plate of the lower tank of an oil-filled electric appliance, so that the outside line of the tank of the oil deterioration prevention tank is at the upper side. Horizontal stripping C of the chain-shaped pedestal so that it is located outside the vertical line of the edge of the tank; By fixing the tank to prevent oil deterioration, the cost of assembly and disassembly is completely reduced; It is characterized by reducing work on the top surface and increasing safety.
[Embodiment of the Invention] An embodiment of the present invention will be described below with full reference to FIGS. 1 and 2. The same parts as in FIGS. 3 and 154 are given the same reference numerals. That is, an oil-filled electrical device such as a transformer or a reactor, for example a transformer, will be explained. A transformer tank l is formed from a lower tank 2 and an upper tank 3. Iron core C: The transformer body 4 shown by the dotted line and wrapped with windings is housed in the transformer tank.

Then, the vertical side t3a of the inverted-shaped pedestal B is welded or bolted to the mounting seat 15 fixed to the outside of the side plate 23 of the lower tank 2.

Further, the horizontal side portion 13 of the pedestal 13. The oil deterioration prevention device 7 is mounted on the upper side of the transformer tank l via a temporary leg 16, and the side surface 17 of the oil deterioration prevention tank of the oil deterioration prevention device 7 is installed outside (=positioned) from the edge of the transformer tank l. That is, along the side surface 17 of the oil deterioration prevention tank, the outer fitting 18 is located at the outer side of the vertical line 19 indicated by the two-dot chain line at the edge 3a of the upper tank 3, as indicated by the line z1 and fJ. .

Further, the oil deterioration prevention device 7 is connected to the upper tank 3 via a pipe 7a. In addition, the pudding 8 is installed, the surface cooling device 9 and the oil piping 10 related to this! Connect and relax W
11. Connect the transformer tank l.Although not shown, after all other accessories are attached and fully assembled, the inside of the transformer tank l is brought to a nitrogen state and lubrication is performed to complete the assembly.

Next, the effects of the present invention will be explained. As mentioned above, l: the side plate mounting seat 15 of the lower tank 2 of the transformer tank l;
ζ; The vertical side 13a of the inverted-shaped pedestal 13 is attached, and the oil deterioration prevention tank is installed on the horizontal side 13b so that the side 17 is on the outside of the end area of the upper tank 3. . Therefore, there is no need to remove the oil deterioration prevention device 70 at all in the work f2 of removing the C-port upper tank 3.
Disassembly and assembly time is shortened.

In this way, the time for assembly and disassembly work is shortened, so for example, during assembly, the transformer body 4 is stored in the transformer tank 1 and heated and dried to reduce the water content. However, since the time it takes to store the transformer in the transformer tank l and lubricate it is shortened, the time that the transformer main body 4 is exposed to the atmosphere is shortened, and the transformer main body 4 is exposed to moisture, adhesion of floating dust, etc. To be able to minimize negative impacts.

2. After the start of operation at the site (2. Spare winding and gland replacement 7) or when it becomes necessary to lift out the transformer body 4 for replacement, the 10.Ll, 7a, and other accessories must be removed, but the upper tank 3 can be removed or installed from the vertical direction without removing the oil deterioration prevention device 7 and the pedestal 13, so disassembly and installation are easy. The assembly work time can be significantly shortened. Therefore, the work cost can be reduced, and the insulation properties of the transformer body 4 can be prevented from deteriorating.

In addition, if there is an allowance in the transport limit dimensions from the manufacturer's factory to the site, the frame 'fr: transformer tank (if it is possible to transport with two numbers), the frame 13 should be welded to the side plate 2 of the lower tank 2. You may choose to eat twice.

Also, the mount is 13k L-shaped! By doing this, the frame 13
Since one space can be secured at the bottom of the system, this space can be used effectively for installing coolers and cubicles.

〔Effect of the invention〕

As explained above, 2. Attach the side plate (binary-shaped frame) of the lower tank of the transformer tank. 1) It shortens the assembly and disassembly work time of the transformer, minimizes the deterioration of the insulation properties of the transformer body, and reduces the cost of the work (2). It is possible to provide an oil deterioration prevention device for oil-filled electrical appliances that can improve the safety of oil-filled electrical appliances.

[Brief explanation of drawings]

Figures 1 and 2 are a plan view and a side view, respectively, of the oil deterioration prevention device for oil-filled appliances of the present invention, and Figures 3 and 4 are plane views, respectively, of the conventional oil deterioration prevention device for oil-filled appliances. FIG. 2 is a diagram and a side view.

Claims (1)

[Claims] In an oil deterioration prevention device for an oil-filled appliance in which the oil deterioration prevention tank is attached to a frame with one side fixed to the upper tank of the oil-filled appliance tank, an inverted L is attached to the side plate of the lower tank of the oil-filled appliance tank.
One vertical side of the pedestal in the shape of a letter is fixed, and the oil deterioration prevention tank is fixed on the other side of the pedestal so that the outer line of the oil deterioration prevention tank is located outside the vertical line of the edge of the upper tank. This is an oil deterioration prevention device for oil-filled electrical appliances.