JPS60154511A - Transformer - Google Patents

Abstract

PURPOSE:To simplify the assembling of the title transformer by a method wherein a bushing pocket is detachably provided on a tank and the height of said bushing pocket is made taller than the bushing part to be inserted in the pocket. CONSTITUTION:A bushing pocket 2 is formed taller than the length (e) of the inserting part of a bushing 3 in the length (f), and it is oil-tightly fixed to the transformer by tightening a bolt through the intermediary of a packing. After the bushing 3 has been attached to the pocket 2, it is lifted by a lifting lug and installed on a tank 1. According to this constitution, the entire lifting height H' can be made low, and it is unnecessary to have a large housing structure. Also, the pocket 2 performs an additional function as a protective case for transportation of the bushing 3, and the bushing is self-supported. Through these procedures, works can be conducted at low position in an easy and safe manner, and lifting up distance is reduced, thereby enabling to markedly improve the performance of work.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a transformer, and the transformer is assembled inside a building.

An improved transformer bushing pocket that reduces the height of a crane for hoisting bushings during modification and repair.

[Technical background of the invention and its problems] Conventionally, when installing a bushing in a bushing pocket formed integrally with a transformer tank in a transformer assembled inside a building, the bushing is 3 with the crane hook 5, and then lift it up into the transformer body tank 1.
The method used was to assemble the bushing by lowering it into the bushing pocket 2 provided at the top of the bushing. However, according to this method, the lifting height of the crane is 11 in FIG.
is the height a to the bushing pocket 2 provided in the transformer tank 1, the suspension length C1 of the bushing 3, and the length d of the rope 4 for hanging the bushing 3, respectively. It will be the added height.

Therefore, the lifting height of the crane becomes H = a + b + c + d. However, in recent years, due to the increase in power demand, transformers have become increasingly thicker, and today, as power transmission using ultra-high voltage is being implemented, the lifting height has become extremely high. In some cases, the lifting height 11 of the crane is insufficient in the building, making it impossible to carry out assembly and maintenance, which has the disadvantage that the building has to be made larger. ] The present invention aims to provide a transformer in which the bushing can be easily assembled without the need to dig up the building by eliminating the above-mentioned conventional drawbacks and reducing the height of the bushing when assembling the transformer. The purpose is to

[Summary of the Invention] In order to achieve the above objects, the present invention makes the bushing pocket detachable from the transformer tank, and also makes the height of the bushing pocket smaller than the length of the bushing inserted into the bushing pocket. By increasing the length of the bushing, the height required for lifting the bushing can be reduced by attaching the bushing to the bushing pocket in advance and then assembling the bushing pocket to the transformer tank.

"Embodiment of the invention" An embodiment of the present invention will be described below with reference to the drawings.
In the figure, the bushing pocket 2 in the transformer of the present invention is longer than the lower dimension e of the bushing 3 inserted into the bushing pocket 2 by a dimension f, which is the height h of the bushing pocket 2, and is detachable from the transformer tank 1. Appropriate means such as oil-tight connection with bolts via a backing can be used as a removable structure.
) will be.

With this configuration, the bushing 3 can be attached in advance to the bushing pocket 2 on the transformer installation surface. Next, when the bushing pocket 2 to which the bushing 3 has been previously attached is to be attached to the transformer tank 1, the bushing pocket 2 is lifted up by the lobe 4 using the hanging lug 6, as shown in FIG. The height H' of the suspension at this time is H'=a'+b+h+d. Here, the height a' of the transformer tank 1 is the height a' of the transformer tank 1 when the bushing pocket 2 and the bushing 3 are attached.
Since it is removable, it can be lowered accordingly, and the overall lifting height H' can also be lowered. Therefore, there is no need to enlarge the building in order to lift the bushing. In addition, the transformer bushing pocket 2 of the present invention (δ) has the following advantages.This bushing pocket 2 can also be used as a transport case for the bushing 3, so the bushing 3 can be removed after the factory test. It can be shipped without having to remove it from the bushing pocket 2.

In addition, when attaching the bushing 3 to the bushing pocket 2 or attaching the VF to the transformer tank 1, the work can be done from a stable, low position on the footing, making it safer and more workable.

Furthermore, even when the bushing 3 is attached to the bushing pocket 2, its independence can be maintained, which has the advantage of reducing storage and work space.

[Effect of the invention] As described above, in the present invention, assembly is carried out inside a building.

When modifying or repairing a malfunction, be sure to remove the bushing into the bushing pocket. Since it can be lifted with -4, the lifting size of the crane can be reduced, and work can be done easily from a low position (2) It is safe and work efficiency is improved, which has the effect of improving work.

[Brief explanation of the drawing]

Fig. m1 is a front view showing how to lift a bushing of a conventional transformer, Fig. 2 is a sectional view showing a state in which a bushing is attached to a bushing pocket in a transformer according to the present invention, and Fig. 3 is a front view showing a state in which a bushing is attached to a bushing pocket in a transformer according to the present invention. O which is a front view showing lifting of the bushing pocket 1...Transformer kunk 2...Bushing pocket 3
... Bushing 4 ... Rope 5 ... Crane hook 6 ... Hanging ear agent Patent attorney Noriyuki Chika (EL or one person) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In a transformer in which the lower part of the bushing is inserted into a bushing pocket provided on the transformer tank, the bushing pocket is made detachable from the transformer tank and the height dimension of the bushing pocket is adjusted to the height of the bushing pocket. A transformer characterized in that the length is longer than the length of the bushing inserted into the transformer.