JP2008205105A - Electrostatic induction apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrostatic induction apparatus which has low loss, is easy to manufacture, does not restrict transportation and has a tank magnetic shield. <P>SOLUTION: The electrostatic induction apparatus consists of an iron core, a coil wound around the iron core and a tank accommodating the core and the coil. It is equipped with a magnetic shield 1 made of a highly magnetically permeable material attached to a side face wall in the tank 3 and a non-magnetic shield 2 made of a highly conductive material attached to the side face wall in the tank 3 on an upper side and a lower side of the magnetic shield 1. By attaching the non-magnetic shields to the upper and lower parts of the magnetic shield, leakage magnetic flux is forced back by the non-magnetic shields and induced toward the magnetic shield absorbing the magnetic flux. Thus, local overheating not only on the side face of the tank but also on an inclined surface of the tank and upper and lower surfaces of the tank can be avoided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a static induction appliance such as a transformer or a reactor.

  In static induction appliances such as transformers and reactors, local overheating may occur due to leakage magnetic flux emitted from windings or lead wires entering the tank. In such a case, measures are often taken to attach a magnetic shield with a high permeability material such as a silicon steel strip or a nonmagnetic shield with a high conductivity material such as an aluminum plate or a copper plate to the inner surface of the tank. .

Generally, the tank of a static induction machine is divided into upper and lower parts by tank flanges, and the upper and lower tank surfaces may be inclined due to transportation restrictions. In the same structure, a method of applying two or more shields in combination has been proposed in order to suppress local heating of the tank flange portion and the tank inclined portion.
JP-A-8-330156 JP-A-64-89409 Japanese Patent Laid-Open No. 11-26262 JP 60-070713 A

  When a magnetic shield made of a silicon steel strip is applied to the inclined tank inner surface, it is necessary to bend the silicon steel strip along the tank bending portion, which takes time. Since a large number of magnetic shields are arranged side by side and attached to the inner surface of the tank, it takes time to attach a number of silicon steel strips separately to the upper and lower tanks divided by the tank flange.

  On the other hand, since the non-magnetic shield is made of a thin and large copper plate or aluminum plate, it has a feature that bending work and attachment work to the tank are easier than the magnetic shield. However, the principle of the non-magnetic shield is that the leakage magnetic flux to be incident is pushed back by the induced current induced in the shield, so that a loss is generated by that current, and the generated loss is larger than when the magnetic shield is applied. There is a problem.

  In recent years, large transformers often employ a disassembled and transported local assembly method in which windings, iron cores, and tanks are disassembled and transported separately and reassembled locally. In that case, since the tank itself is often disassembled and transported in the upper, lower, upper, middle, and lower directions, the shield is required to have a structure that can be easily transported while attached to the inner surface of the tank.

Japanese Patent Laid-Open No. 8-330156 proposes a structure in which a magnetic shield is attached to the side of the tank and a non-magnetic shield is attached to the entire upper tank. In this proposal, the upper end of the magnetic shield attached to the side surface is protruded upward from the tank flange surface to prevent overheating of the tank flange. There is a risk that the tip of the shield may be a restriction on tank transportation. In addition, since it is necessary to attach a non-magnetic shield such as a copper plate or an aluminum plate to the entire upper tank, there is a problem that the material cost becomes high and at the same time the production takes time.

  Japanese Patent Application Laid-Open No. 60-70713 proposes a method of attaching a magnetic shield to the tank upper slope without bending. In this method, the structure is adopted in which the width of the inclined upper tank is made wider than the width of the lower tank and at the same time the lower magnetic shield protrudes upward from the tank flange surface. It is difficult to enlarge the tank width due to the shield part.

  Japanese Patent Application Laid-Open No. 11-26262 proposes a structure in which a magnetic shield is attached to the tank top and bottom inclined part and the side straight part, and a non-magnetic shield is attached to the vicinity of the tank flange part and the tank bent part. This method has a low loss because the magnetic shield is applied to the majority of the area, there is no need to bend the magnetic shield, and a non-magnetic shield is placed at the joint between the magnetic shields. Therefore, there is no risk of leakage magnetic flux entering the tank. However, there is a problem that it takes a lot of time to attach a large number of small magnetic shields and non-magnetic shields.

  Japanese Patent Application Laid-Open No. 64-89409 proposes a structure in which a non-magnetic shield is attached to the vertical portion of the tank side surface and a magnetic shield is attached to the inclined portion of the upper and lower surfaces of the tank. According to this structure, leakage magnetic flux can be effectively prevented from entering the tank, but the non-magnetic shield is applied to the side of the tank where there is a large amount of magnetic flux leakage. Since the magnetic shield is applied to the portion, there is a problem that it takes time to perform bending for attaching to the bent portion of the tank.

  An object of the present invention is to provide an electrostatic induction electric device such as a transformer or a reactor having a tank magnetic shield, which is easy to manufacture with low loss and is not restricted by transportation.

  In order to achieve the above object, a static induction electric machine according to the present invention includes a magnetic shield made of a high permeability material attached to an inner surface of the tank, and at least an upper side and a lower side of the magnetic shield. A non-magnetic shield made of a high conductivity material attached to the inner surface of one of the tanks, wherein the non-magnetic shield covers at least one of the upper inner surface and the lower inner surface of the tank.

  Further, the static induction electric machine according to the present invention includes an iron core, a winding wound around the iron core, a tank having a divided structure including the iron core and the winding and including an upper tank and a lower tank through a tank flange. A magnetic shield made of a high permeability material on the inner surface of a tank having a large inner area facing the winding among the upper tank and the lower tank divided by the tank flange. In addition, the non-magnetic shield made of a high conductivity material is covered on the inner side surface of the other tank.

  Further, the static induction electric machine according to the present invention includes an iron core, a winding wound around the iron core, an upper tank, a center tank, and a tank flange that houses the iron core and the winding and is provided at the upper and lower portions. In a static induction appliance comprising a tank having a divided structure consisting of a lower tank, a magnetic shield made of a high magnetic permeability material is attached to the inner surface of the central tank, and either the upper tank or the inner surface of the lower tank or A nonmagnetic shield made of a high conductivity material is attached to both of them.

  According to the present invention, a low-loss magnetic shield is applied to the side of the tank that faces the winding and has a large amount of incident leakage magnetic flux. By applying a non-magnetic shield, it is possible to obtain an electrostatic induction electric machine having a tank magnetic shield that is easy to manufacture with low loss.

  In addition, by providing a shield boundary and a gap in accordance with the tank flange position, it becomes easy to disassemble and transport the tank while the shield is attached.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a static induction electric apparatus according to the present invention will be described with reference to the drawings.

A first embodiment of the present invention will be described with reference to FIG.

In the present embodiment, a stationary induction electric device body composed of a winding 5 and an iron core 6 is housed in a tank 3 filled with an insulating medium such as insulating oil or SF6 gas. A magnetic shield 1 made of a silicon steel strip, which is a high magnetic permeability material, is attached to the tank side surface 3a, and a non-magnetic shield 2, which is a high conductivity material such as an aluminum plate or a copper plate, is attached above and below the tank side surface 3a. .

  However, the nonmagnetic shield 2 does not cover the entire upper tank, but is attached only to the upper tank inclined portion 3b.

A part of the leakage magnetic flux emitted from the winding 5 goes to the tank 3 instead of the iron core 6, but most of it goes to the magnetic shield 1 attached to the tank side face 3a.

However, the partial leakage magnetic flux may locally overheat the tank upper and lower surfaces 3c and 3d and the inclined portion 3b by moving toward the tank upper and lower surfaces 3c and 3d and the inclined portion 3b. Therefore, by attaching the nonmagnetic shield 2 above and below the magnetic shield 1 as in the present embodiment, the leakage magnetic flux is pushed back by the nonmagnetic shield 2 and guided toward the magnetic shield 1 that absorbs the magnetic flux. The By this action, not only the tank side surface portion 3a but also the local overheating of the tank inclined surface 3b and the tank upper and lower surfaces 3c, 3d can be avoided.

  A low-loss magnetic shield 1 is attached to the tank side surface 3a with a large amount of magnetic flux leakage, and a non-magnetic material that is easy to process and attach to the upper and lower parts of the tank that requires a small amount of magnetic flux leakage but requires bending. By applying the shield 2, it is possible to configure a tank magnetic shield that is easy to manufacture with low loss. Since the leakage magnetic flux emitted from the winding 5 is directed in the direction of the iron core 6 and the magnetic shield 1, there is little component incident on the upper and lower opposing portions of the iron core 6 on the upper and lower tank surfaces 3c and 3d.

  Therefore, even if the nonmagnetic shield 2 does not cover the entire upper and lower tank surfaces 3c and 3d as in the present embodiment, the tank local overheating does not occur. In FIG. 1, the tank flange 4 is in the upper part and the upper and lower parts of the tank are inclined. However, the present invention can be applied to a structure in which the tank flange is in the lower part or a structure in which the tank is not inclined. If only one of the top and bottom of the tank is inclined due to transportation restrictions, and the magnetic shield on the non-inclined side can be extended for a long time, a non-magnetic shield is attached only to the surface where the tank is inclined Just do it.

  Further, the magnetic shield 1 and the non-magnetic shield 2 can obtain a shielding effect against not only the leakage magnetic flux from the winding 5 but also the leakage magnetic flux emitted from the lead wires arranged in each part in the tank. it can.

Next, a second embodiment of the present invention will be described with reference to FIG.

  Also in the present embodiment, as in the first embodiment, the stationary induction electric device body composed of the winding 5 and the iron core 6 is housed in the tank 3 filled with an insulating medium such as insulating oil or SF6 gas. Yes. In the present embodiment, with the tank flange 4 as a boundary, a magnetic shield 1 is attached to the upper portion thereof, and a nonmagnetic shield 2 is attached to the lower portion thereof. The operation of the present embodiment is the same as that of the first embodiment, and the leakage magnetic flux emitted from the winding 5 toward the lower surface 3c of the tank is pushed back by the nonmagnetic shield 2 and the magnetic shield 1 Guided in the direction. By applying the magnetic shield 1 to the tank side surface 3a having a large amount of leakage magnetic flux and applying the non-magnetic shield 2 to the lower surface 3c of the tank below the relatively small tank flange, the tank magnet can be easily manufactured with low loss. Shield can be configured. When adopting the method of transporting the upper tank and the lower tank separately, the shield structure is divided according to the position of the tank flange 4 as in this embodiment, so that the shield end protrudes from the tank flange surface during tank transportation. Therefore, transportation with the shields 1 and 2 attached to the tank 3 is facilitated.

  In FIG. 2, the tank flange 4 is on the lower side of the tank. In this case, a magnetic shield is attached to the lower side of the tank flange and a non-magnetic shield is attached to the upper side.

Next, a third embodiment according to the present invention will be described with reference to FIG.

  Also in the present embodiment, as in each of the above-described embodiments, the stationary induction electric device body including the winding 5 and the iron core 6 is housed in the tank 3 filled with an insulating medium such as insulating oil or SF6 gas. Yes. In the present embodiment, the tank can be divided into an upper tank 3d, a central tank 3a, and a lower tank 3c by tank flanges 4a and 4b provided at the top and bottom.

A magnetic shield 1 is attached to the central tank 3a, and a non-magnetic shield 2 is attached to the upper tank 3d and the lower tank 3c. The operation of this configuration is the same as in the first and second embodiments, and the effect is the same as in the second embodiment, in that a low-loss and easy-to-manufacture magnetic shield can be realized, and a shield is attached. It is the point that the tank disassembly transportation in the state becomes easy.

Next, a fourth embodiment according to the present invention will be described with reference to FIG.

  Also in the present embodiment, as in each of the above-described embodiments, the static induction electric device body including the winding 5 and the iron core 6 is housed in the tank 3 filled with an insulating medium such as insulating oil or SF6 gas. Yes. This embodiment has substantially the same configuration as that of the third embodiment, except that a gap is provided between the magnetic shield 1 and the nonmagnetic shield 2. With such a configuration, the action of pushing back the magnetic flux of the non-magnetic shield 2 and the action of absorbing the magnetic flux of the magnetic shield 1, even if there is a gap between the shields, there is little leakage magnetic flux entering the tank. 3 and tank flanges 4a and 4b do not cause local overheating. By providing an air gap, the upper and lower shields can be reliably insulated, so there is no concern of local overheating due to incomplete contact between the shields. Further, since manufacturing errors can be allowed, the shield can be easily processed and assembled.

  Furthermore, since the shield tip is lowered from the tank flange surface, the possibility of accidentally damaging the shield tip when the tank is disassembled and transported with the shield attached is reduced. In FIG. 4, a gap is provided in the vicinity of the tank flanges 4a and 4b. However, a gap is provided between the magnetic shield 1 and the non-magnetic shield 2 where there is no flange, as in the lower part of the tank shown in FIG. Even if it provides, the same effect can be acquired.

  Next, a fifth embodiment according to the present invention will be described with reference to FIG.

  Also in the present embodiment, as in each of the above-described embodiments, the stationary induction electric device body including the winding 5 and the iron core 6 is housed in the tank 3 filled with an insulating medium such as insulating oil or SF6 gas. Yes. In the present embodiment, the upper end portion of the nonmagnetic shield 2 partially overlaps the lower end portion of the magnetic shield 1. With the structure in which the shield tip portions are partially overlapped in this way, the leakage magnetic flux 7 passing through the magnetic shield 1 is pushed out to the tank inner surface at a portion in front of the tip portion of the magnetic shield 1 and wound. Follow the path back to line 5. There are several methods for supporting the magnetic shield 1 from the tank. However, in the case where the magnetic shield 1 is supported by the receiving seat 8 provided at the lower part of the shield as in the present embodiment, if the leakage flux penetrates the receiving seat 8, the receiving seat 8 The possibility of overheating arises. Therefore, according to this configuration, it is possible to suppress not only the tank 3 and the tank flange 4 but also local overheating of the receiving seat 8.

1 is a longitudinal side view of a first embodiment according to the present invention. Vertical side view of the second embodiment of the present invention Vertical side view of the third embodiment according to the present invention Vertical side view of the fourth embodiment according to the present invention Longitudinal side view of a fifth embodiment according to the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Magnetic body shield 2 ... Nonmagnetic body shield 3 ... Tank 4 ... Tank flange 5 ... Winding 6 ... Iron core 7 ... Leakage magnetic flux path 8 ... Magnetic Body shield seat

Claims (5)

In a static induction appliance comprising an iron core, a winding wound around the iron core, and a tank containing the iron core and the winding,
A magnetic shield made of a high permeability material attached to the inner surface of the tank, and a non-conductive material made of a high conductivity material attached to the inner surface of at least one of the upper side and the lower side of the magnetic shield. A stationary induction device comprising a magnetic shield, wherein the non-magnetic shield covers at least one of an upper inner surface and a lower inner surface of the tank. In a static induction electric machine comprising an iron core, a winding wound around the iron core, and a tank having a divided structure composed of an upper tank and a lower tank through a tank flange that houses the iron core and the winding,
Of the upper tank and the lower tank divided by the tank flange, a magnetic shield made of a high magnetic permeability material is attached to the inner surface of a tank having a large inner area facing the winding, and the inside of the other tank is A static induction electric appliance characterized by covering a nonmagnetic shield made of a high conductivity material on a side surface. An iron core, a winding wound around the iron core, and a tank having a divided structure including an upper tank, a central tank, and a lower tank via a tank flange that houses the iron core and the winding and is provided at the upper and lower portions In the static induction machine
A magnetic shield made of a high magnetic permeability material is attached to the inner surface of the central tank, and a non-magnetic shield made of a high conductivity material is attached to either or both of the inner surfaces of the upper tank and the lower tank. A stationary induction device characterized by being installed.   4. The static induction appliance according to claim 1, wherein a gap is provided at a boundary between the magnetic shield and the non-magnetic shield.   The ends of the magnetic shield and the nonmagnetic shield partially overlap, and the end of the nonmagnetic shield is disposed on the inner side of the magnetic shield surface. 4. The static induction machine according to 4.

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