JPS6098609A - Stationary induction electrical apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to stationary induction electric appliances such as transformers and reactors, and particularly to stationary induction electric appliances equipped with magnetic clamps for controlling magnetic flux leakage from windings. Regarding improvements.

[Technical background of the invention and its problems]

In static induction appliances, the amount of magnetic flux leaking from the windings is increasing due to the reduction in size and weight. An increase in leakage magnetic flux not only increases stray loss occurring in internal structures such as tanks and iron cores, but also induces local temperature increases, which may affect product performance and reliability from various viewpoints. has been viewed as a problem. In order to eliminate or reduce these inconveniences, recently, ring-shaped magnetic clamps made of magnetic thin plates such as silicon steel plates have been installed at the upper and lower ends of the windings to actively attract magnetic flux leaking from the windings. However, a leakage flux control method is being used in which magnetic flux flows into a place with low magnetic resistance, such as an iron core yoke, to reduce the amount of magnetic flux penetrating into other structures.

FIG. 1 shows such a conventional core type transformer.

(2) is the iron core leg, (3), (3) is the iron core leg (2)
Core yokes are placed at the upper and lower ends of the core, and have a structure that magnetically connects the core legs of other phases. On the sides of the core leg (2) and core yoke (3), there are abutment plates (5) and fastening fittings (5a).

(5b) is applied and firmly tightened. This iron core leg (2) has an inner winding (6) and an outer winding (6; I) wound coaxially, and a ferromagnetic thin plate such as a silicon steel plate is wound around the upper and lower ends of the core leg (2). An annular magnetic clamp formed (
These transformer internal elements are housed together with an insulating medium (8a) in a tank (8).

” In a conventional transformer configured as a duplex, the I
The inner winding (6) and the outer i++m winding (6) are shown in PA.
The leakage magnetic flux φ from between a) is attracted by the magnetic clamp (force) at the upper end of the winding, and then flows through it in the circumferential direction and invades the lower end of the iron core yoke (3). As a result of the significant reduction in leakage magnetic flux that enters the clamps (5a), (5b) and the iron core leg (2), the loss of 4Ei that occurs in these is greatly reduced by θ.And this magnetic clamp (force is It will also be highly effective in preventing local Jlj fever.

However, in such a conventional structure, leakage magnetic flux φ from the winding may enter the tank (8), increasing overheating and loss. In order to eliminate this problem, measures are sometimes taken to attach a magnetic shield to the inner wall of the tank, but this has the problem of increasing costs, which must be resolved.

[Purpose of the invention]

The present invention has been made in consideration of the above points, and its purpose is to provide static induction that prevents overheating and loss due to leakage magnetic flux at the tank wall. 1) To provide 4 vessels.

[Summary of the Invention] In order to achieve the above object, the present invention provides a core yoke which magnetically couples the core leg to both ends of the core leg, and a core yoke which is wound around the core leg. The motive is to prevent overheating and loss due to leakage magnetic flux on the tank wall by arranging a ring-shaped magnetic clamp with a flange at both ends of the winding. It is preferable to form a separate magnetic ring electrically insulated and attached near the outer periphery of the main body of the clamp.

[Embodiments of the invention]

An embodiment of the stationary induction electric device of the present invention is shown in Figs. 2 and 3 below.
This will be explained with reference to the figures. Among stationary induction electric appliances such as transformers and accelerators, for example, a three-phase three-legged transformer (1υ is constructed as shown in Figure 2. Iron core yokes ([3)] are installed at the upper and lower ends of the iron core legs (12). The core legs 03) of the other phases are magnetically coupled. The iron core leg (121) and the side of the iron core yoke OJ are firmly tightened by applying a contact plate or clamping fittings (15a) and (15b). Inner winding (16) and outer winding (16a)
The transformer body formed in this way has an insulating medium (18a), such as insulating oil, inside the tank 08).
).

A magnetic clamp with a flange (1η is formed into an annular shape by winding a ferromagnetic thin plate such as a silicon steel plate or a silicon steel strip, as shown in FIG. 3). A pot (17b) is formed to protrude toward the winding side.The thickness dl of the main body (17a) is (17
The thickness of b) is increased to a thickness of d, and this tip (17
b) The main body part (17a) is placed at a distance from the lower L end of the outer winding (1, 6a) and slightly covers the outer periphery of the winding end.
It is formed so as to protrude from the winding side.

Incidentally, when winding the ferromagnetic thin plate to form a ring, it is a matter of course that one turn is not formed.

Next, the effects of the present invention will be explained. The leakage magnetic flux φ from the inner and outer windings (Ifil, (16a)
7b) and passes through the core yoke 031 to the core leg (
The cost of magnetic flux penetrating the tank (18) wall can be greatly reduced.

For example, the thickness d of bubba (17b) is 100+111fl
It has been experimentally confirmed that when there is no loss (17b) caused by the magnetic flux penetrating the tank wall (171), the loss can be significantly reduced by 9%.In this way, In particular, since there is no need to provide a magnetic shield on the tank wall, manufacturing costs can be reduced.

Next, another embodiment of the present invention will be described with reference to FIGS. 4 and 5. The same parts and parts having the same functions as those in FIGS. 2 and 3 are given the same reference numerals.

As shown in Figures 4 and 5, a magnetic clamp with a collar (1
η is formed by fixing a collar (171) consisting of an annular magnetic ring to the outer peripheral end of the main body (17a) via an insulating member (17c). The collar (17b) of this magnetic clamp θD is insulated and fixed by the main body (17a) and the insulating member (17c), so the boxwood (17b)
Since the magnetic flux can be extended for a long time close to the winding, the magnetic flux penetrating the tank (solid wall) can be further reduced than in the embodiment of the present invention.

〔Effect of the invention〕

As explained above, according to the stationary induction electric appliance according to one embodiment of the present invention, magnetic clamps with annular flanges are provided at the upper and lower ends of the winding, so that leakage magnetic flux from the winding is absorbed by the tank wall. Provides a stationary induction electric appliance that can reduce the temperature increase and loss of the tank wall by reducing the amount of magnetic flux that enters the tank wall, and in particular can reduce costs because there is no need to provide a magnetic shield on the tank wall. can do.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing the main parts of a conventional transformer, FIG. 2 is a longitudinal sectional view showing the main parts of a transformer according to an embodiment of the present invention, and FIG.
The figure is an enlarged partial side view of the flange-equipped magnetic shield shown in FIG. 2, and FIG. 4 is a vertical sectional view showing the main parts of another embodiment of the present invention.
Figure 5 is an enlargement of the magnetic shield with flange in Figure 4 - Immediate judgment 1 hour
It is a side view. ■)...Transformer, 021...Iron core leg (1)...Iron core yoke. (1(i), (16a)...Inner and outer winding. 0 force...Magnetic with flange Clamp. (17a) One main body + (171)) One flange (17
c) ...Itoshiro Meshukubu Shrine. (18)...Tank. Agent Patent Attorney I -1--Male Figure 1b Figure 2 Including b Figure 3 f7 Figure 5/7 Figure 4 t'sb

Claims (2)

[Claims] (1) A core leg, a core yoke arranged at both ends of the core leg to magnetically couple the core legs, a winding wound around the core leg, and an annular arrangement arranged at both ends of the winding. A stationary induction electric appliance comprising a magnetic clamp and a tank for storing the magnetic clamp together with an insulating medium, the magnetic clamp with a flange having a flange thicker than the thickness of the main body formed on the outer circumferential side of the magnetic clamp and protruding toward the winding side. A stationary induction electric appliance characterized by being equipped with. (2) A stationary induction electric appliance according to claim 1, wherein a magnetic clamp with a flange is formed by insulating and fixing a separate magnetic ring near the outer peripheral side 1 of the main body of the magnetic clamp.