JPS59204220A - Stationrary induction electric apparatus - Google Patents

Abstract

PURPOSE:To reduce the number of sheets of the magnetic shielding plates of a stationary induction electric apparatus by a method wherein a pair of the magnetic shielding plates projected obliquely having the prescribed angles in the outer direction of a window at every phase from a magnetic shielding plate arranged extending over another phase are combined to the latter. CONSTITUTION:Even when leakage flux generated between a high-voltage winding 1 and a low-voltage winding 2 intends to invade in a tank or another structural material, the greater part thereof is attracted at first to magnetic shielding plates 40 split and juxtaposed along the shape of the winding, and after then, according to action of magnetic flux to flow transferring to a magnetic shielding plate 20 provided extending over another phase, reduction of loss at the respective parts of a transformer can be attained. Moreover, a pair of the magnetic shielding plates 40 protruded obliquely having the prescribed agnles theta in the outer direction of a core window are arranged as to along the outermost diametrical winding as much as possible. Accordingly, because the magnetic shielding plates can be concentrated to one piece making the central part of the phase of the winding as a boundary, the number of sheets of the wiring is reduced sharply.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention is directed to a magnetic shield plate attached to an iron core fastening fitting of a stationary induction electric appliance. II: Induced frost; Concerning improvements in vessels.

[Background of the invention]

In recent years, the static induction 47, such as a transformer, has become increasingly larger in capacity, and leakage flux from the windings has also increased accordingly. For this reason, efforts are being made to minimize the increase in stray loss caused by rain magnetic flux and the local temperature rise occurring in structural materials by using magnetic shield plates.

This will be explained with reference to a plan view of one phase of a conventional transformer shown in FIG. In the figure, 1.2 is the 18th line, 3 (ti' iron IL・
, 20.30 is a magnetic shield root placed at the end of the winding. Among these, the magnetic shield 4 anti-20 straddles other phases, and the magnetic shield plates 30d are divided and arranged parallel to each other along the winding shape at a face angle toward the outside of the iron core window every +1-1. , these two wires are magnetically coupled at their ends.

In a transformer with this configuration, even if the leakage magnetic flux generated between the high-voltage winding 1 and the low-voltage winding 2 tries to enter the tank (not shown) or other structural materials, it will be divided and juxtaposed along the winding shape. Most of the magnetic flux is attracted to the magnetic shield root 30, and then the magnetic flux moves to the magnetic shield plate 20, which is deaf to other phases, and flows, thereby reducing losses in each part of the transformer. The reason why the magnetic shield plate 30 is divided into multiple pieces and arranged in parallel is to minimize the loss of the shield plate itself that occurs when the magnetic shield plate 30 becomes larger, and to improve the magnetic shielding effect in such a purchase. This is so that it can be fully demonstrated.

However, as the capacity of transformers increases, the winding diameter also inevitably increases, and in order to achieve the above effects,
Magnetism that projects perpendicularly to the outside of the window for each phase /-
It became necessary to increase the number of lead plates 30, which was a disadvantage in providing an economical transformer.

[Purpose of the invention]

The purpose of the present invention is to reduce the number of magnetic shield plates without reducing the shielding effect of the magnetic shield plates.
We offer a complete range of economical stationary guide tools that reduce manufacturing man-hours and costs.

[Summary of the invention]

The advantage of the present invention lies in the combination of a pair of magnetic shield shields that protrude diagonally from the magnetic shield shields arranged across the other phases toward the outside of the window at a predetermined angle.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a plan view of the main parts of the transformer similar to FIG. 1.

The difference from the conventional structure is that a pair of magnetic shield plates 40 that project obliquely at a predetermined angle θ toward the outside of the iron core window are arranged so as to follow the outermost diameter winding as much as possible.

With this structure, the length of the magnetic shield plate 40 protruding outward from the iron core window can be ensured to be sufficiently long.
However, the number of devices required can be reduced significantly by consolidating them into one at the upper part of the phase of the winding. In addition, the area covered by the magnetic//- lead plate 40 can be made almost the same as the conventional one by carrying the plate width fK optimally, so the magnetic flux attraction effect and el should be the same as in this case. Can be done.

FIG. 3 shows a second embodiment of the invention. In the case where a pair of magnetic shielding members 50 diagonally protruding toward the outside of the core window do not approach the outermost diameter winding but bite into the inside of the windings 1 and 2, the angle θ' toward the outside of the core window is is larger than θ in the case of FIG. In the case of this structure, the length of the magnetic shield plate 50 is longer than that of the platform shown in Fig. 2, but by making optimizations such as slightly widening the range of the magnetic shield, the length of the magnetic shield plate 50 is longer than that shown in Fig. 2. It can fully demonstrate the same effect as Kuyo.

FIG. 4 is a plan view of a narrow portion of a transformer end phase according to a third embodiment of the present invention.

In the end phase that cannot be covered by the magnetic shield plate 20 disposed in the 41D phase, the magnetic shield plate 60 protruding diagonally, and the iron core 3, etc., the magnetic shield plate protrudes obliquely at a predetermined angle θ toward the outside of the iron core window. On the other hand, the structure is such that the magnetic shield 70 is longer than the others, and a part of the winding wire exposed at the end can be protected by the magnetic shield &70.

Traditionally, this structure has a tank (not shown) at the end phase.
The effect of the present invention described in FIG. 2 is even more certain because the large amount of magnetic flux that has penetrated into the magnetic flux and other structural materials is actively attracted by the total magnetic shield &70 and transferred to the magnetic field plate 20 and flows. Become something.

FIG. 5 shows a fourth embodiment of the present invention, and is a plan view of the main part of a transformer similar to FIG. 2.

The difference from the conventional structure is that the iron core is set at a predetermined angle θ toward the outside of the window.
The point is that the tank-side end surfaces of the pair of a-air/-old plates 80 that protrude obliquely are arranged parallel to the entire border of the phase center. 4 in the figure is a tank. In the present invention, the entire magnetic shield core protrudes obliquely toward the outside of the window at a predetermined angle, but the present invention is not limited to this, and the present invention may also be constructed with a triangular winding plate. It is possible to achieve the following effects.

〔Effect of the invention〕

According to the present invention, in the tank near the upper part of the phase indicated by the diagonal line where the loss is excessive, the winding is surrounded by the magnetic shield just by providing a small gap, so that the shielding effect for the tank is improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view of one phase of a conventional transformer, Fig. 2 is a plan view of one phase of an embodiment of the present invention, and Figs. The third embodiment is a plan view of one phase, and the fifth embodiment is a plan view of the end of the transformer in the fourth embodiment of the present invention. 20.30, 40, 50, 60, 70.80...Magnetic sea 2 / Kaya 4 figure Kaya S mouth

Claims (1)

[Claims] 1. In a stationary induction electric appliance having a magnetic shield plate distributed over other phases in order to guide leakage magnetic flux to the upper and lower ends of the winding, each phase is provided with a magnetic shield plate extending toward the outside of the iron core window. A stationary induction electric appliance characterized in that a pair of magnetic shield plates as described above are disposed in combination and are protruded obliquely at a predetermined angle.