JPH0851037A - Stationary induction machine - Google Patents

Abstract

PURPOSE:To obtain a stationary induction machine equipped with a magnetic shielding unit for preventing the local temperature rise of a tank, while making uniform the restriction performance and the interval of a magnetic shielding board, by minimizing the gap G at the seam of the magnetic shielding board thereby shielding the leakage flux to the tank. CONSTITUTION:The stationary induction machine comprises a stationary induction machine body including a core and a winding, a tank 3 for housing the body, and a plurality of magnetic shielding boards 4 arranged at an interval while facing the inner wall of the tank 3. Since a stud is inserted into a screw hole made at the upper part of the magnetic shielding board 4 which is thereby secured to the inner wall face of the tank 3 integrally with the stud, the fixing gap of the magnetic shielding board 4 is minimized and local heating due to intrusion of flux into the tank 3 of transformer can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static induction generator which reduces eddy current loss in a tank of a static induction generator such as a transformer or reactor and prevents local temperature rise.

[0002]

2. Description of the Related Art Generally, a leakage magnetic flux generated by a load current flowing in a winding of a static induction generator such as a transformer flows into a tank containing the winding as a part of its magnetic path, and an eddy current is generated in the tank. Since a local temperature rise occurs, a plurality of magnetic shield plates made of magnetic material are arranged on the front surface of the inner wall of the tank in order to reduce the temperature rise of the tank.

FIG. 6 is a plan view of a conventional magnetic shield device, and FIGS. 7A, 7B, 7C, and 7C are plan views, front views, and views of a portion A in FIG.
It is a side view. In these figures, in the tank 3,
The main body of the static induction electric device including the iron core 1 and the winding 2 is housed, and a supporting seat 10 extending horizontally is fixed to the lower portion of the inner wall surface of the tank 3 by welding. This support seat 10
Is provided with a plurality of holding plates 7 and 8 arranged in the vertical direction while holding the mounting pitch P of the magnetic shielding plates 4 mounted on the inner wall surface of the tank 3 in advance. The magnetic shield plate 4 having magnetic plates laminated in correspondence with the pitch P is inserted between the pressing plates 7 and 8 from above, and the tip end thereof is brought into contact with the support seat 10, and then the screw hole of the support seat 10 is provided. Is used to fix the tip of the magnetic shield plate 4 by the support seat 11 and the bolt 12.

The conventional magnetic shield device 4 is constructed as described above, and since the magnetic shield plate 4 is arranged inside the tank 3 and is generally constructed by stacking silicon steel plates, it flows through the transformer winding 1. Most of the magnetic flux having the magnetic path of the tank 3 out of the leakage magnetic flux generated by the load current does not enter the tank 3 and suppresses the local temperature rise of the tank 3 due to the eddy current generated by the leakage magnetic flux.

[0005]

However, when the conventional magnetic shield device 4 is attached to the inclined surface portion near the bottom surface of the tank 3 as shown in FIG. A gap G occurs in a portion where the shield plate cannot be attached. Since the magnetic resistance of the gap G portion is high, a part of the magnetic flux 9 passing through enters the tank 3. As a result, an eddy current is locally generated in the tank 3, and the eddy current loss causes a local temperature rise of the tank.

The present invention has been made to solve the above-mentioned drawbacks, and its purpose is to minimize the gap G of the magnetic shield plate joint to shield the leakage magnetic flux to the tank and raise the local temperature of the tank. It is an object of the present invention to provide a magnetic shielding device for a static induction electric device which prevents the above-mentioned phenomenon and also obtains the restraint property of the magnetic shielding plate and the uniformity of intervals.

[0007]

In order to achieve the above-mentioned object, a magnetic shielding device for a static induction machine according to claim 1 of the present invention is a static induction machine body comprising an iron core and a winding, and the static induction machine body. A tank for housing the magnetic shield plate, a plurality of magnetic shield plates facing the inner wall of the tank at a distance, and a stud inserted into and fixed to a screw hole provided on the upper part of the magnetic shield plate. The stud is integrally fixed to the inner wall surface of the tank.

[0008]

According to the magnetic shield device for a static induction electric device of the present invention, since the supporting seat is not provided unlike the conventional case, the magnetic shield plate mounting gap can be minimized, and the magnetic flux can enter the transformer tank. It is possible to suppress local heating due to.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. 1A and 1B show a first embodiment of the present invention. FIG. 1A is a plan view, FIG. 1B is a front view, and FIG. 1C is a side view.

As shown in FIG. 1, the magnetic shield plate 4 is fixed to the wall surface of the tank 3 in advance, so that a bolt tightening hole is provided at a position corresponding to the mounting pitch P of the magnetic shield plate 4 near the upper end portion. 6a is provided. Using the bolt tightening hole 6a, the vicinity of the upper end of the magnetic shield plate 4 is fixed by the fixing bolt 6. Then, at least a pair of holding plates 7 and 8 are arranged in a plurality of rows in the vertical direction, one end holds the magnetic shield plate 4, and the other end is welded to one side to attach a plurality of magnetic shield plates 4 to the tank 3 in the longitudinal direction. Mount it vertically.

According to the present embodiment, the magnetic shield plate 4 is attached in close contact with the fixing bolts 6, so that it is possible to prevent vertical deviation and prevent incomplete grounding. Further, since the conventional support seat 10 is not required when the magnetic shield plate 4 is also attached to the inclined portion of the wall surface of the tank 3, the gap G between the magnetic shield plates 4 and 4 can be minimized. Therefore, the local temperature heating of the tank 3 caused by the eddy current due to the leakage magnetic flux entering the tank 3 in the gap G can be suppressed. Further, the mutual dimension pitch P between the magnetic shield plates 4 and 4 can be uniformly held by the fixing bolt 6 and the bolt tightening hole 6a.

FIG. 2 is a side view of the second embodiment of the present invention. As shown in FIG. 2, the stud 14 is installed on the wall surface of the tank 3 and the magnetic shield plate 4 is arranged by using this stud 14. 1
It is fixed at 5. In the present embodiment, as in the embodiment of FIG. 1, when the magnetic shield plate 4 is also attached to the inclined portion of the wall surface of the tank 3, the conventional support seat 10 is not required. Since the gap G can be minimized, the leakage flux tank 3 in the gap G can be
It is possible to suppress the local temperature heating of the tank 3 caused by the eddy current due to the invasion into the tank.

FIG. 3 is a side view of a third embodiment of the present invention. As shown in FIG. 3, a receiving seat 13 having a screw hole is previously installed on the side opposite to the wall surface of the tank 3 and is utilized. If the fixing bolt 6 is passed through the wall surface of the tank 3 and tightened, the rigidity is further increased. In the present embodiment, as in the embodiment of FIG. 1, when the magnetic shield plate 4 is also attached to the inclined portion of the wall surface of the tank 3, the conventional support seat 10 is not required. Since the gap G can be minimized, it is possible to suppress the local temperature heating of the tank 3 caused by the eddy current due to the leakage magnetic flux entering the tank 3 in the gap G.

FIG. 4 is a side view of the fourth embodiment of the present invention. As shown in FIG. 4, the magnetic shield plate 4 is supported at a portion abutting against the lower end of the magnetic shield plate 4 so that the gap G does not become excessive. If the plate 16 is installed vertically to the wall surface of the tank 3, the magnetic shield plate 4 can be supported from below, so that the vertical restraint and rigidity are further enhanced. In the present embodiment, as in the embodiment of FIG. 1, when the magnetic shield plate 4 is also attached to the inclined portion of the wall surface of the tank 3, the conventional support seat 10 is not required. Since the gap G can be minimized, it is possible to suppress the local temperature heating of the tank 3 caused by the eddy current due to the leakage magnetic flux entering the tank 3 in the gap G.

FIG. 5 shows a fifth embodiment of the present invention. FIG. 5A is a front view and FIG. 5B is a side view. As shown in the figure, a fixing bolt 6 for the magnetic shield plate 4 and a plurality of holding plates 7 and 8 are provided. When the magnetic shield plate 4 is attached in this manner, the rigidity is further increased and the restraint property is increased. In this embodiment, as in the embodiment of FIG.
Since the conventional supporting seat 10 is not required when it is also attached to the inclined portion of the wall surface, the gap G between the magnetic shielding plates 4 and 4 can be minimized.
It is possible to suppress the local temperature heating of the tank 3 caused by the eddy current due to the leakage magnetic flux entering the tank 3 in the above.

[0016]

As described above, according to the present invention,
A magnetic shield device for a static induction machine that can suppress the invasion of magnetic flux into the tank, can be easily attached to the tank, can evenly maintain the distance between the magnetic shield plates, and can enhance the action of restraining the magnetic shield plates. Can be provided.

[Brief description of drawings]

1A, 1B, and 1C are a plan view, a front view, and a side view, respectively, of a first embodiment of the present invention.

FIG. 2 is a side view of the second embodiment of the present invention.

FIG. 3 is a side view of the third embodiment of the present invention.

FIG. 4 is a side view of the fourth embodiment of the present invention.

5 (a) and 5 (b) are a front view and a side view of a fifth embodiment of the present invention.

FIG. 6 is a plan view of a conventional magnetic shield device.

7 (a), (b), and (c) are a plan view, a front view, and a side view of a portion A in FIG.

FIG. 8 is a side view of a conventional magnetic shield device in which a magnetic shield plate is attached to a tank inclined surface portion.

[Explanation of symbols]

1 ... Iron core, 2 ... Winding, 3 ... Tank, 4 ... Magnetic shielding plate, 5
… Weld metal, 6… Fixing bolts, 7, 8… Holding plate, 9…
Magnetic flux, 10, 11, 16 ... Support seat, 12 ... Bolt, 13
… Catch, 14… Stud, 15… Nut.

Claims (1)

[Claims] 1. A static induction machine body comprising an iron core and a winding, a tank for housing the static induction machine body, a magnetic shield plate arranged facing the inner wall of the tank at a plurality of intervals, and the magnetic field. A static induction machine characterized in that a stud is inserted and fixed in a screw hole provided in the upper part of the shield plate, and the magnetic shield plate is integrally fixed to the inner wall surface of the tank with the stud.