JPH0529168A - Method of assembling transformer iron core - Google Patents

Abstract

PURPOSE:To provide a compact-type transformer which eliminates the need for an iron base nor communication bolt and reduces the width of its lower tank and curtails the quantity of oil and the weight. CONSTITUTION:A fastening jig 4, which is a temporary base, is mounted with an upper yoke 3 of an iron core 2 stacked horizontally on an iron stack and hoist jig 1. The iron core stack and hoist jig 1 and a crane 5 are used to place down and hoist the upper yoke 3. Then, a lower yoke 7 of the iron core 2 is covered with a lower tank 6 which is turned upside down so that the iron core 2 and the lower tank 6 may be fixed. The top and the bottom of the whole iron core 2 fixed to the lower tank 6 is inverted so that it may be hoisted in a regularly assembled condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling an iron core of a transformer having a bell type tank.

[0002]

2. Description of the Related Art Recently, bell-type tank structures are often required for transformers for overseas markets. This is based on the idea that it is better to leave the heavy contents body in place and lift the light upper tank when inspecting the transformer contents body at a local substation where it is difficult to procure lifting machines. is there.

The bell-type transformer has a structure in which a bell-shaped upper tank is put on a transformer main body composed of a winding wire, an iron core and the like. FIG. 2 is a cross-sectional view of an essential part showing the structure of the lower part of the bell-type transformer. In FIG. 2, an iron core stand 8 is attached to the lower yoke portion 7 of the iron core 2, and the lower yoke portion 7 of the lower tank 6 is attached. A coil 9 is housed inside, a winding 9 is wound around the iron core 2, and a bell-shaped upper tank (not shown) is covered to form a transformer.

Reference numeral 10 is a connecting bolt.

3 (A) to 3 (C) are explanatory views showing a method of assembling the iron core of a conventional bell type transformer.
As shown in (A), an iron core stand 8 and a connecting bolt 10 are attached to a mountain-shaped iron core 2 which is not packed with an upper yoke portion 3 which is horizontally stacked on a jig 1 for standing up the iron core stack, and is used for standing up the iron core stack. The iron core 2 is erected by the jig 1 and the lifting machine 5, and the iron core 2 is lifted by the hoisting jig 11 via the connecting bolt 10 as shown in FIG. 3 (B), and the iron core 2 is lowered as shown in FIG. 3 (C). The yoke portion 7 is stored in the lower tank 6.

As described above, in the bell type, since the lower tank has a structure in which the lower tank and the winding are narrowed so as to be close to each other, the oil amount can be reduced and the winding can be tightened by the lower tank. It has the feature that it is not necessary to prepare a rigid clamp.

[0007]

However, in the above-described conventional iron core assembling method, the iron core base 8 and the connecting bolt 10 are used.
In addition, the narrowing amount of the lower tank 6, that is, the reduction amount of the width of the tank is limited, so that it is difficult to make it compact.

The present invention has been made in view of the above points and does not require an iron core stand or a connecting bolt, and reduces the width of the lower tank to reduce the amount of oil and weight, thus making the bell type compact. The purpose is to provide a transformer.

[0009]

In the method for assembling a transformer core according to the present invention, first, the lower yoke is erected upright to attach the lower tank, and then the upper and lower sides are turned upside down to form a regular iron core assembled state. It is characterized by doing.

[0010]

According to the method of assembling the transformer iron core of the present invention, the bellows transformer can be obtained in which the iron core pedestal and the connecting bolt are not required, the width of the lower tank can be reduced, the oil amount and the weight are reduced, and the size is reduced. be able to.

[0011]

1 (A) to 1 (C) are explanatory views showing an embodiment of a method for assembling a transformer iron core according to the present invention. As shown in FIG. A clamping jig 4 as a temporary base is attached to an upper yoke portion 3 of a mountain-shaped iron core 2 which is horizontally stacked on the tool 1, and the upper yoke portion 3 is lifted by the iron core stacking upright jig 1 and a lifting machine 5. To stand upright, then
As shown in (B), the lower yoke portion 7 is covered with a lower tank 6 which is turned upside down to fix the iron core 2 and the lower tank 6, and then fixed to the lower tank 6 as shown in FIG. 1 (C). This is a method of assembling a transformer core in which the entire upper and lower parts of the iron core 2 are replaced with each other and inverted so as to stand up in a regular assembled state.

[0012]

As described above, according to the method of assembling the transformer iron core according to the present invention, (1) the iron core pedestal, which was conventionally required mainly for lifting, is no longer necessary, and the function of maintaining the iron core upright is provided in the lower tank. Can be combined.

(2) Since the iron core is firmly fixed to the tank, it has an effect of preventing steadying during transportation, an earthquake, or an accident, and the conventional steadying member is unnecessary.

(3) A connecting bolt for lifting is unnecessary.

(4) Since the amount of narrowing down of the lower tank can be made large, it is possible to reduce the amount of oil and the weight while making it compact.

(5) Since a method of hoisting a light object (lower tank) without hoisting a heavy object (iron core) is effective in terms of work safety, and the number of manufacturing steps can be reduced.

The effects such as the above can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an assembly method according to an embodiment of the present invention,
(A) is an explanatory view showing a state immediately after stacking the iron core, (B) is an explanatory view showing a state where the iron core is temporarily erected, and (C) is an explanatory view showing a regular upright state of the iron core.

FIG. 2 is a cross-sectional view of essential parts showing the structure of the lower portion of a conventional bell-type transformer.

3A and 3B are explanatory views of an assembling method of a conventional example, FIG. 3A is an explanatory view showing a state immediately after stacking an iron core, FIG. 3B is an explanatory view showing a state in which an iron core is temporarily erected, and FIG. Explanatory drawing which shows a normal standing state.

[Explanation of symbols]

1 ... Iron core stacking upright jig, 2 ... Iron core, 3 ... Upper yoke part,
4 ... Tightening jig, 5 ... Lifting machine, 6 ... Lower tank, 7 ... Lower yoke part, 8 ... Iron core stand, 9 ... Winding wire, 10 ... Connecting bolt, 11
… Lifting jig.

Claims (1)

Claims: 1. An iron core of a bell-type structure in which a bell-shaped tank is covered on a transformer main body composed of a winding wire, an iron core, etc. Attach a tightening jig as a temporary base to the upper yoke portion of the horizontally stacked iron cores, and raise the upper yoke portion downward with the lifting machine and the lower yoke portion upward so as to stand up by the iron core stacking upright jig. Next, cover the lower yoke, which has been turned upside down, on the lower yoke portion of the iron core to fix the iron core and the lower tank, and then replace the upper and lower parts of the whole solid iron core in the lower tank by turning them upside down and standing up in a normal assembled state. A method of assembling a characteristic transformer core.