JPS607109A - Shell type transformer for electric power - Google Patents

Abstract

PURPOSE:To miniaturize the transformer by elimination of a core supported beam by a method wherein the iron core in the lower layer part of a leg core is constructed of an adhesion iron core of the integral body obtained by adhesion of the laminated plates of iron cores. CONSTITUTION:The lower tank 1 of the titled transformer supports the group 2 of coil windings and the iron core. The lower layer part of the leg core 7 is constructed of the adhesion iron core 8 of the integral body obtained by adhesion of the laminated plates. The laminated plates are adhered into an integral body and therefore strong enough to support the core 7, having the same function as that of the core supported beam. Thereby, the beam is unnecessitated, and accordingly the dimensions of the shunt transformer become smaller.

Description

[Detailed description of the invention] This invention relates to electric power out-of-state iron transformers.

In particular, it relates to the support structure of the leg core of a power transformer.

An example of the configuration of the coil insulation group 9 leg iron core, core support beam, electromagnetic shield, lower tank, etc. in a conventional electric power interstate iron-type transformer will be explained with reference to Figs. 1 to 5. The lower tank l of the electric power interstate iron transformer supports the core legs 3 via the core support beam 6.
There is a coil insulation group around the leg core 3, and a lower electromagnetic shielder and an upper electromagnetic shield j are inserted between the leg core 3 and the coil insulation group. As shown, both ends of the core support beam 6 are supported by the lower tank 1 to support the leg core.

As is well known, the thickness of the iron core is dJ ~ 0! Since it is constructed by stacking laminated plates made of silicon steel plates as large as a dragon, the leg core 3 itself does not have the strength to support its own weight.
Therefore, in the conventional structure, the above-mentioned iron core support beam 6
was indispensable as a structure to support the leg core 3, but the transformer had the disadvantage that it became larger by the core support beam.

This invention was made in consideration of the above, and it is compact because it does not use an iron core support beam.

The purpose of this transformer is to provide an economical power transformer, and the lower part of the single-leg core is composed of a bonded core made by bonding laminated plates of the core. By doing so, sufficient strength is obtained to support the leg cores, the core support beam is eliminated, and the transformer is miniaturized to achieve the above objectives.

The invention will now be described with reference to one illustrated embodiment.

In this invention, as shown in FIG. q, the lower tank supports the coil insulation group and the iron core, which is the same as the conventional one, but one leg iron core 7 is placed in the lower layer part, This adhesive core is composed of a bonded core made by bonding and integrating laminated plates, and since the laminated plates are bonded and integrated, it has the strength to support the leg core, and has the same function as a core support beam. The leg core 7 is supported by the legs.

As a result, core support beams are no longer required and the dimensions of the transformer are reduced accordingly.

FIG. 3 shows an embodiment in which an electromagnetic shield is provided below the bonded iron core 9 to reduce the generation of eddy current product due to the intrusion of leakage magnetic flux. The eddy current product is a loss of power and can also cause temperature rise and local overheating of the transformer, so
This needs to be made smaller.

Figure 1 shows that slits 11 are provided on the bottom surface of the bonded core IO to subdivide the core width, thereby reducing the generation of eddy current products due to leakage magnetic flux entry, and adding an electromagnetic shielding function to the bonded core /θ. This is an example.

Although the above explanation has been given by taking a single-phase transformer as an example, a three-phase transformer or a multi-phase transformer can also have the same configuration as the single-phase transformer, and can have improved effects.

According to the present invention, as described above, by using a bonded core in the lower part of the leg core, a core support beam is not required, the transformer is downsized, and economical efficiency and compatibility with transportation size restrictions are improved. It has the effect of

[Brief explanation of drawings]

Fig. 1 is a plan view showing the inside of a tank of a conventional external iron type transformer, Fig. 2 is a sectional view taken along line II-ITIC in Fig. 1, and Fig. 3 is a sectional view taken along line m-nt in Fig. 2. cross section,
The first diagram is a sectional view similar to FIG. 2, showing an embodiment of the power peripheral iron transformer according to the present invention. (3) FIG. 3 is a sectional view similar to FIG. 3 showing another embodiment of the present invention, and FIG.
It is a sectional view similar to the figure. l...Lower tank, 2...Coil e group, 3...Leg core, lI...Lower electromagnetic shield,! r...Top electromagnetic shield, 6...Iron core support beam, ?・・Leg iron core, 9
．． lθ...Adhesive core, 4/...Slit. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa (4') Homura 2 figure 5 'l [-2 Note 3 figure 4 figure!

Claims (1)

[Claims] (1) An electric power interstate iron transformer characterized in that the lower part of the leg core that interlinks with the coil insulation group is composed of a bonded core in which core laminates are bonded and integrated. (g) The electric power interstate iron transformer according to claim 1, wherein an electromagnetic shield is attached or inserted between the lower part of the leg core and the coil insulation group.