JPS5929128B2 - stationary induction appliance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stationary induction electric appliance such as a transformer or a reactor that uses an iron core in which the cross section of the leg portion on which the winding is attached is non-circular.

In stationary induction appliances, such as transformers, the legs of the core to which the windings are attached are generally made of silicon steel plates, which are magnetic materials, stacked so that the cross-sectional shape is as close to a circle as possible. The inner and outer windings each having a cylindrical shape 10 are attached to form the inside of the transformer.

However, when the core and winding are formed in this way,
Although it is effective in increasing the strength against the large electromagnetic mechanical force that occurs in the event of a short circuit, when storing the contents of the transformer in the tank, 15 requires a lot of unnecessary space and the space factor inside the tank is poor. , the entire transformer becomes larger, and the amount of insulating medium filled in the tank also increases.
In order to improve this point and reduce the size and weight, the cross-sectional shape of the 20 legs of the core was formed into a non-circular shape such as a rectangular or oval shape, and inner and outer windings with a rectangular or oval cross-section were attached to this. It has been proposed to manufacture a transformer by installing it to form the contents of a transformer and storing it in a tank.

25 An example of this transformer is shown in Figs. 1 and 2, and the transformer contents 1 housed in the tank 5 include an iron core 2 formed by laminating steel plates, and a cross section of the legs 3 that is non-linear. It is configured to have a circular rectangular shape, and is equipped with inner and outer windings 430 that are shaped to fit the leg portions 3 of the iron core 2.

Insulating spacing pieces 6 are disposed between the windings 4 of each phase and between the windings 4 and the longitudinal sides of the tank 5 to support the windings. In this way, in the transformer using the core 2 whose legs 3 have a non-circular cross section, not only can the space factor inside the tank 5 be greatly improved, but also the dimension between each phase leg 3 of the core 2 can be shortened. As a result, the entire transformer can be made smaller and lighter, and the number of types of laminated steel plates can be greatly reduced, resulting in various effects such as a reduction in manufacturing man-hours.

However, in such a transformer, the length of the winding 4 is limited because the winding arranged in the leg 3 having a non-circular cross section is inferior to the circular winding in the radial electromagnetic mechanical force that occurs during a short circuit. The side portions are supported by insulating spacing pieces 6 to improve strength,
In particular, the winding 4 facing the longitudinal direction of the tank 5 must be constructed to support electromagnetic mechanical forces through insulating spacing pieces 6, as shown in FIGS. 1 and 2.

For this reason, after storing the transformer contents 1 in the tank 5, the winding 4
The insulating spacing piece 6 must be inserted between the long side portion and the tank 5, and its thickness must be adjusted according to the dimensional tolerance, so manufacturing is not easy, and the insulating spacing piece 6 cannot be rolled. When the wire 4 and the tank 5 are not in close contact with each other, even if a reinforcing stay is provided on the outer surface of the tank 5 to increase its rigidity, this tank cannot prevent the winding 4 from deforming due to electromagnetic mechanical force in the radial direction. There is a drawback that it cannot be done. The object of the stationary induction electric appliance of the present invention is to enable the insertion position of an insulating spacer placed between the winding and the tank to be adjusted from outside the tank, thereby firmly supporting the winding on the tank. ,
The purpose is to make production easier.

In order to achieve the above object, in the present invention, when the windings attached to the legs of an iron core having a non-circular cross section are supported by the tank through insulating spacers, the outer surface of the tank facing the windings is A reinforcing stay is fixed to the auxiliary chamber, and this reinforcing stay is used to create an auxiliary chamber that is sealed with a lid, and a pressure bolt that is operated from the auxiliary chamber side is screwed into a screw seat that is fixed to the tank part that becomes part of the auxiliary chamber. In addition, the winding can be pressed through the insulating spacer.

゛Hereinafter, Figs. 3 to 6, which are examples to which the present invention is applied, will be explained.
This will be explained using the example of the transformer shown in the figure.

In the transformer of the present invention, as shown in FIGS. 2 and 3, the transformer contents 1 are formed by attaching the inner and outer windings 4 to the legs of the iron core 2, which have a non-circular cross section, in the tank 5 as in the conventional case. stored, winding 4
An insulating spacing piece 6 is disposed between the long side of the tank 5 and the tank 5 facing the long side.

As shown in FIGS. 4, 5 or 6, a reinforcing stay 11 is also fixed to the outer surface of the tank 5 facing the long side portion of the winding 4 in the same manner as the other parts. The reinforcing stays 11 located at positions corresponding to the height of the tank 5 are connected by another reinforcing stay 11 to form an auxiliary chamber 10, thereby increasing the rigidity of the tank 5 portion. The auxiliary chamber 10 is formed so that a lid 12 with a gasket 13 interposed therebetween is hermetically sealed with fixtures 14a and 14b.
The auxiliary chamber 10 shown in FIGS. 4 and 5 is formed using a horizontal reinforcing stay 11 fixed horizontally to the outer surface of the tank 5, and the auxiliary chamber 10 shown in FIG. 5 shows an example formed using the longitudinal reinforcing stays 11 of No. 5. The reinforcing stay 11 of the tank 5 that forms this auxiliary chamber 10 is an L-shaped member in the illustrated embodiment, so the reinforcing stay 11 portion of this L-shaped member can also be used as a mounting flange for the lid 12. can. A portion of the tank 5 facing the winding 4 forms part of the auxiliary chamber 10,
At least one screw seat 15 is fixed to this tank 5 portion by welding, and an insulating spacer 6 is attached to the screw seat 15.
A pressing bolt 16 that presses the winding 4 through the screw is screwed onto the pressing bolt 16. The pressing bolt 16 is arranged so as to penetrate from the inside of the tank 5 into the auxiliary chamber 10, and is operated from the auxiliary chamber 10 side.
It is fixed in place by a lock nut 17. A pressing piece 16a provided at the tip of the pressing bolt 16 as necessary transmits the pressing force to the insulating spacing piece 6 in a distributed manner. Further, in the embodiment shown in FIGS. 3 and 4, a pressure receiving plate 18 having a U-shaped cross section is disposed between the insulating spacing piece 6 and the pressing bolt 16. Therefore, even if the pressing piece 16a is omitted, the pressing force of the pressing bolt 16 is evenly transmitted to the insulating spacing piece 6, so that the winding 4 can be firmly supported. The number of screw seats 15 fixed to the tank 5 and the pressing bolts 16 screwed therein are set appropriately according to the height of the winding 4 to reduce the electromagnetic mechanical force in the radial direction generated in the winding 4. , so that it can be reliably supported by the tank 5.

The winding 4 is pressed by the pressing bolt 16 by storing the transformer contents 1 in the tank 5 and then operating the pressing bolt 16 from the auxiliary chamber 10 side to press the insulation spacing piece 6 directly or through the pressure receiving plate 18. Since the insulating medium is tightly attached to the outer peripheral surface of the winding 4 and the auxiliary chamber 10 is then sealed with the lid 12 to prevent leakage of the insulating medium, assembly of the transformer can be performed extremely easily.

If a stationary induction electric appliance is configured as in the present invention, the winding can be supported by the tank by adjusting the position of the insulating spacer after the contents of the electric appliance are stored in the tank. The line can be strongly supported by the tank, and the auxiliary chamber is formed using reinforcing stays, which has the effect of increasing the rigidity of the tank.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of a conventional stationary induction appliance, FIG. 2 is a schematic perspective view of FIG. 1, FIG. 3 is a perspective view showing an embodiment of a stationary induction appliance to which the present invention is applied, and 3 is a longitudinal sectional view of FIG. 3, FIG. 5 is a perspective view of FIG. 3, and FIG. 6 is a perspective view showing another embodiment of the stationary induction appliance of the present invention. 1...Transformer contents, 2...Iron core, 3.
... Legs, 4 ... Windings, 5 ...
Tank, 6...Insulating spacing piece, 10...
Auxiliary room, 11... Reinforcement stay, 12...
・Lid body, 15...Screw seat, 16...Press bolt, 16a...Press piece, 17...
・Lock nut, 18...Pressure plate.

Claims (1)

[Scope of Claims] 1. The contents of an electric appliance having an iron core with a non-circular leg section and a winding wound around the leg of the iron core are housed in a tank, and the winding is an insulating material disposed on the outer surface of the electric appliance. In the tank supported through a spacer, a reinforcing stay is fixed to the outer surface of the tank opposite to the insulating spacer, and the reinforcing stay forms an auxiliary chamber that is sealed with a lid, and one part of the auxiliary room is 1. A stationary induction electric appliance, characterized in that a screw seat is fixed to a tank portion forming a section, and a pressing bolt that is operated from the auxiliary chamber side and presses a winding through an insulating spacing piece is screwed into the screw seat. 2. The stationary induction electric appliance according to claim 1, wherein a pressure receiving plate is disposed between the insulating spacing piece disposed on the outer surface of the winding and the pressing bolt. 3. The stationary induction electric appliance according to claim 1, wherein the reinforcing stay is formed with a flange portion of the lid using an L-shaped member.