JPH01183105A - Oil-filled electric apparatus - Google Patents

Abstract

PURPOSE:To make the transportation easier and to increase the insulating strength, by making an opening between the reinforcing beams of the flat boardlike side wall on the bushing fitting side of a tank, and fitting a bushing pocket directly on to the reinforcing beams. CONSTITUTION:The side walls 3a of a tank 3 are constituted with a partially cylindrical shell, and reinforcing beams 4 are fitted separated outside the tank side-walls 3a. And the side wall of the bushing pocket 6 fitting side of the tank is made in a flat board shape, then an opening 10 is made between the reinforcing beams 4 of the flat boardlike side wall. At this opening part, the bushing pocket 6 is directly bolted on to the reinforcing beams 4 with oilsealed structure. By the way, in time of transportation, the bushing pocket 6 is removed, and a blind cover is fitted to the opening 10. Furthermore, an electric field weakening shield is fitted to the base, and a sufficiently necessary insulating distance is secured. This enables reducing the size and making the transportation easier, and an oil-filled electric apparatus of high insulating strength can be obtained.

Description

[Detailed Description of the Invention] [Purpose of the Invention (Field of Industrial Application) The present invention relates to oil-filled electrical appliances such as transformers and accelerators, and particularly relates to oil-filled electrical appliances whose tank side walls are constructed with a partially cylindrical shell. Bushing pocket installation involves structural improvements.

(Prior art) In general, the shape and size of the tank of an oil-filled electrical appliance such as a transformer is related to the structure of the main body, which consists of an iron core, coil, etc., and the means for drawing out the lead wire from the coil to the outside of the tank. It is determined by the dimensional constraints of transportation when transporting to the installation site, etc.In recent years, as transformers have become larger capacity and higher voltage, the transportation conditions to the installation site have become stricter. As a result, making transformers more compact has become a more important issue than ever before.One solution to this problem is to use a tank whose side wall is made up of a partially cylindrical shell for the purpose of reducing weight and size. has been done.

In such constructions, the width of the tank is generally determined by the insulation distance from the coil. On the other hand, in the past, the high-voltage lead wire from the main body of the product was passed through the tank cover via an oil-air bushing and pulled out vertically or at an angle, but recently more effective layouts have been developed for gas insulated equipment. Reservoir-gas lashings are increasingly used to horizontally penetrate the tank side wall and connect directly to the gas busbar. By arranging the shipping horizontally close to the transformer installation surface, the configuration of the gas bus box directly connected thereto can be simplified, and a transformer that is superior in terms of maintenance and inspection can be obtained.

In a conventional transformer in which the tank side wall is constructed of a partially cylindrical shell, a structure in which a bushing pocket is horizontally attached to the tank side wall will be explained with reference to FIG. A tank 3 that houses the contents of a transformer consisting of an iron core 1 and a coil 2 wound around the iron core 1 has a side wall 3a formed of a partially cylindrical shell, and reinforcement beams spaced apart from each other on the outside of this side wall 3a. 4 is attached, a part of the cylindrical shell side wall 3a is opened, a bushing pocket mounting joint 5 is welded to the side wall 3a, and a bushing pocket 6 is bolted to this. Lead IIi from inside the transformer! 7 is attached with an oil-gas bushing 8, led out from the bushing pocket 6 to the outside of the tank, and connected to a gas mother @9.

The bushing pocket 6 is removed during transportation and is transported with a temporary cover attached to the joint 5.

(Problem to be Solved by the Invention) However, with such a structure, the bushing pocket mounting joint 5 may protrude from the tank side wall 3IL and exceed the transport dimension limit, which may result in a situation where transport is impossible.
Furthermore, there is little margin for selecting the insulating design of the inside, resulting in a high-cost transformer.

The purpose of the present invention is to eliminate such drawbacks, improve the combination structure of the tank side wall and the bushing pocket, which is composed of a partially cylindrical shell, to reduce the size, facilitate transportation, and obtain an oil-filled electrical appliance with high insulation strength. do.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above objects, the present invention provides a method for mounting a bushing on a tank whose side wall is made of a one-part cylindrical shell. An opening is formed between the reinforcing beams in the side wall, and the bushing pocket is directly attached to the reinforcing beam at this opening.

(Function) With this configuration, when the shipping pocket is removed from the tank body during transportation, there is no part that protrudes from the side wall of the tank, making it much smaller and easier to transport, and the side wall facing the coil. Since the insulation distance is eliminated, a sufficient insulation distance and insulation margin can be obtained.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a tank 3 that houses the contents of a transformer consisting of an iron core 1 and a coil 2 wound around the iron core 1 has a side wall 3a made up of a partially cylindrical shell, and is spaced apart on the outside of this side wall 3a. The reinforcing beam 4 is attached. A reinforcing beam 4 is attached at a distance to the outside of the tank side wall 3a. And the bushing pocket 6'f of the tank side wall 3a
c The mounting side is formed into a flat plate shape, and openings 10 are formed between the reinforcing beams 4 of this flat side wall. Then, the bushing pocket 6 is directly attached to the reinforcing beam 4 in this opening by bolting in an oil-tight manner. A lead wire 7 from the inside of the transformer is led out of the tank from the push/pull I-ket 6 via an oil-gas bushing 8 and connected to a gas busbar 9. The pushing pocket 6 is removed during transportation, and a blind cover is attached to the opening 10 for transportation.

With the transformer tank constructed in this manner, the portion that is separated from the tank body during transportation, that is, the mounting of the bushing pocket 6, does not protrude at the portion, and the size of transportation can be reduced. Furthermore, since the front side wall of the coil 2 is eliminated, the insulation distance between the coil 2 and the tank wall is determined by the position of the reinforcing beam 4 (AF). In addition, by attaching the electric field mitigation shield 11 to the base of the electric field mitigation shield 11, a sufficiently necessary insulation distance can be secured, and it becomes easy to secure the insulation distance. For the bushing attachment 9 of a tank whose side wall is made of a partially cylindrical shell, the side wall is formed into a flat plate, and the side wall between the reinforcing beams attached to the flat side wall is opened, and the side wall is opened in the side wall between the reinforcement beams attached to the flat side wall. Since the bushing pocket was attached to the reinforcing beam in an oil-tight manner, it was made much smaller.

It is possible to obtain an oil-filled electrical appliance that is easy to transport and has high insulation strength.

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[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional oil-filled electrical appliance. 1... Iron core, 2... Coil, 3... Tank, Jm
"・Tank side wall, 4... Reinforcement beam, 5... Mounting joint, 6... Bushing pocket, 7... Lead wire,
8... Oil-gas bushing, 9... Gas bus bar, 1
0...Aperture, 11...Electric field mitigation shield・Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (1)

[Claims] The side wall on the side where the bushing is attached to the tank whose side wall is made of a partially cylindrical shell is formed into a flat plate shape, and the side wall between the reinforcing beams attached to this flat side wall is opened, and the reinforcing beam is connected to the reinforcing beam through this opening. An oil-filled electrical appliance characterized by an oil-tight bushing pocket.