JPH0433302A - Disassembly transportation transformer - Google Patents

Abstract

PURPOSE:To minimize a disassembly part during transportation as for an oil introducing device part by fixing a high pressure device core, by welding and fusing a content supporting hardware to a lower tank bottom of a divided tank and by arranging a partition board of an insulating material in an upper surface of the content supporting metal member and a tank division flange surface which is divided in accordance with a height of an upper surface of the content supporting metal member. CONSTITUTION:A content supporting metal member 5a which fixes to support a lower yoke part of a core 2 between and supports a winding 3 inserted to a core leg is molten and fused to a bottom of a lower tank 1b. A division flange 12 of the upper tank 1a and a lower tank 1b holds and fixes a partition board 6a of an insulating material using a clearance of a division flange part by a gascket 13 arranged in a connection part of the tanks at the same height as an upper surface of the content supporting metal member 5a. An inner peripheral part of the partition board 6a is mounted on an upper surface of the content supporting metal member 5a, and a winding bearer 7 which is provided with an oil introducing hole is arranged thereon to constitute an oil introducing device.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention aims to significantly reduce the transport weight of a transformer by separating the tank and its contents, and by transferring the contents to an iron core winding. The present invention relates to a disassembled and transported transformer of the prepared oil feed type, which is disassembled into pieces, transported, and reassembled at the installation site.

(Conventional technology) In recent years, as transformers have become increasingly high-voltage and large-scale, the construction of power generation and substations in mountainous areas where transportation conditions are harsh, and the construction of underground substations in urban areas has also increased. Significant reductions in the transport weight and dimensions of transformers are required.

For transformers to be installed in such locations, there are two methods: transporting the contents and tank in separate units, or disassembling and transporting the transformers into smaller pieces, such as into tanks with one core and one winding, and reassembling them on site. be.

The present invention relates to an oil guide structure in a forced oil feed type transformer that is divided into parts and transported, and an example of the conventional structure is shown in FIG. The inner part stored on the inner wall of the transformer tank is the iron core 2.
and a core support hardware 5b that tightens the core 2 and supports the winding 3 with the winding 3 wrapped twice around the core and the core tightening tape 4.
Consists of etc. Also.

Insulating oil 10 drawn out from a cooler installed outside the tank to cool the iron core 2 and windings 3 is passed through an oil guide pipe 11 to an oil guide duct consisting of an inner support metal fitting 5b and a partition plate 6b. The winding receiver disposed further on the partition plate flows into the winding through oil guide holes provided in the stand 7 and the winding clamping plate 8.

(Problem to be Solved by the Invention) However, in the conventional structure, when transporting iron cores, coils, etc. by dividing them into fine pieces, the above-mentioned oil guiding device must be disassembled and transported. It takes a long time to reassemble partition plates etc. made of insulators, which not only increases the number of assembly steps, but also causes many negative quality factors such as moisture absorption of the insulators and foreign matter adhering and mixing during reassembly.

The purpose of the present invention is to minimize the disassembly of the lubricating device part during transport in cases where the contents are disassembled and transported in small pieces, thereby significantly reducing assembly time on site and improving quality assurance during reassembly. is to get a transformer.

[Structure of the invention]

(Means for Solving the Problems) The present invention does not use the internal support hardware that fixes the high voltage equipment core and supports the windings as a internal assembly component.

It is fixed by welding to the bottom of the lower tank of the divided tank, and a partition plate made of insulating material is placed between the upper surface of the content support metal fitting and the divided tank split flange surface corresponding to the height of the top surface of the content support metal fitting to form an oil guiding device. .

(Function) As mentioned above, by configuring the oil guide device on the lower tank side without assembling the contents as a component, it is possible to transport the oil guide device while attached to the tank without disassembling it, making it easy to use on-site. No reassembly required.

(Example) Hereinafter, an oil guiding structure for a transformer according to the present invention will be explained using FIG. 1 showing the entire cooling structure of the transformer and FIG. 2 showing the main part of the present invention.

The insulating oil 10 cooled by the cooler 9 provided outside the tanks 1a and 1b flows into the oil guide device whose structure will be described in detail later through the oil guide pipe 11, and flows inside the iron core 2 and the winding 3. This constitutes a circulation path that returns to the cooler.

The present invention relates to the structure of an oil guiding device that feeds insulating oil 10 flowing into a tank from a cooler 9 through an oil guiding pipe 11 to an iron core 2 and a winding 3.

Content support hardware 5a, which is fixed so as to sandwich the lower yoke portion of the iron core 2 and supports the winding 3 inserted into the iron core legs, is welded and fixed to the bottom surface of the lower tank 1b. The dividing flange 12 of the upper tank 1a and the lower tank 1b is at the same height as the upper surface of the contents support hardware 5a, and the gasket 1 is placed at the joint.
The partition plate 6a made of an insulating material is sandwiched and fixed using the gap between the split flange portions 3 and 3. The inner circumferential portion of the partition plate 6a is placed on the upper surface of the content support metal fitting 5a, and a winding receiver with an oil guide hole provided thereon is arranged with a stand 7 to constitute an oil guide device. During transportation, the winding receiver up to stand 7 will remain assembled at the factory.

Furthermore, upper and lower tanks la are separated by a partition plate 6a.

An oil drain valve 14 is provided at the lower end of each of 1b.

According to the above-described embodiment of the present invention, the oil guide device is separated from the internal assembly components and configured on the lower tank side, and there is no work to be done inside the oil guide device on site, so the oil guide device can be constructed easily. It has become possible to transport a wide variety of parts without having to disassemble them.

Therefore, at the site, the lower yoke of the core and the core legs are inserted into the content support hardware fixedly attached to the bottom plate of the lower tank, and then the windings can be inserted without having to reassemble the complicated and time-consuming oil guide system. It is possible to significantly shorten the time and to significantly improve problems related to quality assurance such as moisture absorption of insulators, foreign matter getting into the oil guiding device, and adhesion.

Further, by providing an oil drain valve at the lower end of each insulating oil compartment partitioned by a partition plate, it is possible to rapidly remove minute foreign matter from each insulating oil compartment by oil circulation after lubrication.

In large-capacity transformers, a magnetic shield is often attached to the inner wall of the tank in order to prevent the tank side wall from overheating due to magnetic flux leakage from the windings.

FIG. 3 shows an embodiment of the oil guiding device in such a case.

Since the flange surfaces of the divided flanges 12 of the upper and lower tanks la and lb are easily overheated by air cooling with poor heat transfer, the lower ends of the magnetic shields 15 are extended toward the lower tanks. In this case, the partition plate 6a has a fixed seat 16 fixed to the inner wall surface of the lower tank 1b.

In this structure as well, the parts constituting the oil guiding device can be transported without being separated, so similar effects can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, a complex oil guiding device can be realized by providing the oil guiding device, which consists of the internal support hardware, partition plate, etc., which were conventional components of the transformer internal assembly, on the divided lower tank side. This makes it possible to transport the product by storing it inside a tank without having to separate it, eliminating the need for on-site reassembly.

This has significantly shortened the assembly time on-site, thereby reducing assembly costs, and also improved quality by minimizing the possibility of foreign matter entering or adhering during reassembly work.

Furthermore, by providing an oil drain valve in each oil tank separated by a partition plate, the effect of removing minute foreign matter through oil circulation after oil filling was enhanced.

[Brief explanation of the drawing]

Fig. 1 is an overall view of a transformer cooling structure according to the present invention, Fig. 2 is a cross-sectional view showing its main parts, Fig. 3 is a cross-sectional view showing another embodiment, and Fig. 4 is a conventional oil guiding structure. FIG. 1a... Upper tank 1b... Lower tank 2... Iron core 3... Winding 4... Iron core tightening tape 5a... Contents support hardware 6a...
Partition plate 7... Winding bone is stand 8... Tightening plate 9... Cooler 10... Insulating oil
11... Oil guide pipe 12... Tank division flange 13... Gasket 14... Oil drain valve
15...Magnetic shield 16...Fixed seat agent Patent attorney Noriyuki Chika

Claims (1)

[Claims] In a transformer in which oil is forced into the core and the windings wrapped around the core to cool them both, the inner support hardware holds the lower yoke of the core between them and supports the windings with the upper surface of the lower yoke. A partition plate made of insulating material that is fixed to the bottom of the tank, aligning the tank's dividing flange position near the upper surface of the content support hardware, and placing the inner circumference on the top surface of the content support hardware and fixing the outer circumference by sandwiching it between the tank split flanges. By arranging the tank horizontally, the cooling oil forced from outside the tank flows into the core and the inside of the winding, extending the lower end of the magnetic shield on the inner wall of the tank below the tank dividing flange, and extending the lower end of the magnetic shield from the tank dividing flange. The transformer for disassembly and transport is further characterized in that a fixing seat is fixed to the inner wall of the tank at the bottom, and the outer periphery of the partition plate is fixed.