JPH0710917U - Oil-filled static induction electrical equipment - Google Patents

Abstract

(57) [Summary] [Object] To provide an oil-filled static induction electric device in which a magnet for catching a fragment of an amorphous magnetic alloy floating in insulating oil can be easily attached and detached. [Structure] A tank 1 containing a transformer main body 2 using an iron core 201 made of an amorphous magnetic alloy ribbon together with insulating oil 3.
The magnet 11 is attached to the outer surface of the bottom plate 1b. The non-magnetic member 10 is embedded in the bottom plate 1b of the tank, and the magnetic poles N and S of the magnet 11 are located on both sides of the non-magnetic member 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil-filled static induction electric device using an iron core made of an amorphous magnetic alloy ribbon.

[0002]

[Prior art]

 Recently, static induction electrical equipment such as distribution transformers using amorphous magnetic alloy thin ribbons, which have good magnetic characteristics and low loss, are being put to practical use as materials for forming iron cores. Amorphous magnetic plywood ribbons are extremely thin and become brittle when annealed. Therefore, when static induction electrical equipment is constructed using iron cores made of amorphous magnetic alloy ribbons, it may be difficult to transport or install columns. If vibration or shock is applied to the electric device at the time, the iron core may be chipped and fragments of the amorphous magnetic alloy may be generated. If this shard floats in insulating oil and adheres to the coil of electrical equipment, it may seriously adversely affect the insulation of electrical equipment.

In order to prevent the generation of the fragments of the amorphous magnetic alloy ribbon, attempts have been made to harden the surface of the iron core with a resin or to wrap the iron core with insulating paper or the like.

[0004]

[Problems to be solved by the device]

 When the surface of an iron core made of an amorphous magnetic alloy ribbon is hardened with resin, the iron core is distorted when the resin cures and shrinks, and iron loss increases. Further, when the surface of the iron core is hardened with a resin, a step of applying the resin when manufacturing the iron core and a step of heat-curing the applied resin are required, which increases the number of man-hours for manufacturing the iron core and reduces the cost. I couldn't avoid getting higher.

According to the method of wrapping the iron core with insulating paper or the like, the iron core is not distorted, but in this case, since it is necessary to prepare an insulating paper having a complicated shape, the processing thereof is expensive. Moreover, wrapping the iron core with insulating paper requires a lot of man-hours, which inevitably increases the cost.

Therefore, as seen in Japanese Utility Model Application Laid-Open No. 4-36212, a permanent magnet is arranged between the bottom of the tank housing the electric device body and the lower part of the electric device body, and the non-magnet generated from the iron core is generated. It was proposed that fragments of the crystalline magnetic alloy be adsorbed by a permanent magnet and captured.

However, when the permanent magnets are arranged in the case as described above, there is a problem that the magnets cannot be easily replaced when the magnets deteriorate, and the magnets are arranged in the insulating oil. Therefore, there is a problem that it is not possible to use a rubber magnet or the like having no oil resistance.

The object of the present invention is to make it possible not only to easily replace the magnet for capturing the fragments of the amorphous magnetic alloy ribbon, but also to use a magnet having no oil resistance. To provide a stationary induction electric device.

[0009]

[Means for Solving the Problems]

 The present invention relates to an oil-filled static induction electric device in which a main body of a static induction electric device using an iron core made of an amorphous magnetic alloy ribbon is housed in a tank together with insulating oil. A permanent magnet for adsorbing and holding debris of a high quality magnetic alloy was attached to the outer surface of the lower part of the tank. The lower part of the tank means the part from the lower part of the side surface of the tank to the bottom surface.

In order to strengthen the suction force acting on the fragments of the amorphous magnetic alloy ribbon and to reliably capture the fragments, it is necessary to guide the flow of magnetic flux generated from the magnet into the oil in the tank. I like it. For that purpose, for example, at least the bottom plate of the tank may be formed of a non-magnetic material, and the magnet may be attached to the outer surface of the bottom plate.

When the tank is made of a magnetic material, a non-magnetic material member made of a non-magnetic material such as aluminum is embedded in a part of the lower portion of the tank so that the magnetic poles of the pair of permanent magnets are made of the non-magnetic material. The magnets may be attached to the tank with the magnets positioned on both sides of.

In the present specification, a magnetic material means a material exhibiting ferromagnetism such as iron, and a non-magnetic material means a material other than a ferromagnetic material.

[0013]

[Action]

 As described above, if a permanent magnet that adsorbs and holds the fragments of the amorphous magnetic alloy is attached to the lower outer surface of the tank, the magnet can be easily replaced when it deteriorates.

Moreover, the fragments of the amorphous magnetic alloy ribbon may float in the oil only when the insulating oil is agitated during the transportation of the electric device or during the installation work. It has been confirmed by experiments that debris once settled on the bottom of the tank after installation is not likely to be suspended again in the oil by convection of insulating oil that occurs during the operation of electrical equipment. Therefore, the magnet can be removed after the electric device is installed. In order to prevent the magnets from affecting the magnetic properties of the iron core, it is preferable to remove the magnets while the electric equipment is operating. If the magnet can be attached to the outer surface of the tank as in the present invention, the magnet should be attached only during transportation of the electric equipment and during installation work, and removed after the electric equipment is installed. You can

As described above, the bottom plate of the tank is made of a non-magnetic material and the magnet is attached to the outer surface of the bottom plate, or a non-magnetic member is embedded in the lower part of the tank made of the magnetic material to form a pair of magnetic poles of the magnet. By locating the magnets on both sides of the non-magnetic member, the magnetic flux generated by the magnet can be guided into the oil in the tank, so the magnetic attraction force acting on the fragments of the amorphous magnetic alloy floating in the oil. Can be strengthened to reliably catch debris.

[0016]

【Example】

 FIG. 1 shows an embodiment in which the present invention is applied to a distribution transformer mounted on a pole. In FIG. 1, reference numeral 1 denotes a cylindrical side wall portion 1a, a bottom plate 1b and a cover 1c. An iron tank 2 is a transformer body housed in a tank 1 together with insulating oil 3.

The transformer body 2 includes an iron core 201 having a wound iron core structure made of an amorphous magnetic alloy ribbon, and coils 202 wound around the left and right legs of the iron core 201. The lower part and the lower yoke part are clamped by clamp fittings 203 and 204, respectively.

Bushings 4 and 5 are attached to the upper portions of the side surfaces of the side wall portion 1a of the tank 1, and the lead wires 6 and 6 drawn from the primary coil and the secondary coil of the transformer main body are attached to these bushings, respectively. 7 is connected.

A slit 1b1 is provided substantially in the center of the bottom plate 1b of the tank 1, and a non-magnetic member 10 made of aluminum, copper or the like is embedded in the slit so as to liquid-tightly close the slit. Has been.

Reference numeral 11 denotes a permanent magnet formed in a rectangular plate shape and magnetized in the longitudinal direction. This magnet 11 has a pair of magnetic poles N and S formed at both ends thereof located on both sides of the non-magnetic member 10. It is attached to the outer surface of the tank 1 in a closed state. Any magnet such as a ferrite magnet or a rubber magnet can be used as the magnet 11.

The magnet 11 may be fixed to the bottom plate 1b by a fixing means such as adhesion or screwing, or may be fixed to the bottom plate by a magnetic attraction force acting between the magnet 11 and the bottom plate 1b. If a magnet that can be welded is used, the magnet 11 may be fixed to the bottom plate 1b by welding.

As described above, when a non-magnetic member is embedded in the bottom plate 1b of the tank 1 and the pair of magnetic poles N and S of the magnet 11 are positioned and mounted on both sides of the non-magnetic member, the magnetic flux generated from the magnet is removed. Since it can be introduced into the oil in the tank, the magnetic attraction force acting on the fragments of the amorphous magnetic alloy ribbon floating in the oil can be strengthened and the fragments can be reliably captured. Further, instead of embedding a non-magnetic member in the bottom plate 1b of the tank 1 as in the above embodiment, the bottom plate 1b itself may be made of a non-magnetic material, and the magnet 11 may be attached to the outer surface of the bottom plate by bonding or screwing. However, a strong magnetic attraction force can be similarly applied to the fragments of the amorphous magnetic alloy.

Even when the bottom plate 1b is made of a non-magnetic material, the magnet 11 can be held on the bottom plate 1b by the magnetic attraction force acting between the magnet 11 and the iron core of the electric device body in the tank.

In the above embodiment, the magnet 11 is attached to the bottom plate of the tank, but the magnet may be attached to the outer surface of the lower portion of the side surface of the tank 1 (the portion near the bottom plate 1b). Also in this case, the nonmagnetic member is embedded in a part of the tank, and the magnetic poles N and S of the magnets are positioned on both sides of the nonmagnetic member, so that the fragments of the amorphous magnetic alloy can be formed. A strong magnetic attraction force can be applied.

As described above, after the fragments of the amorphous magnetic alloy are sunk in the bottom plate of the tank, unless the fragments are agitated by the external force acting on the tank, there is no risk that the fragments will float in the oil again. After mounting the vessel, the magnet 11 can be removed. When the magnet 11 is to be removed after mounting the electric equipment, the magnet 11 should be held in the tank by magnetic attraction force, or held in the tank by a fixing means that can be easily removed, such as screwing. It is preferable to keep it. Even when the magnet 11 is attached by adhesion, the adhesive force can be lost by applying a solvent to the adhesive, so that the magnet 11 can be removed. In any case, in the present invention, since the magnet is attached to the outer surface of the tank, the magnet can be easily removed or replaced.

In the above embodiments, the distribution transformer is taken as an example, but the present invention can also be applied to a static induction electric device such as a phasing reactor.

[0027]

[Effect of device]

 As described above, according to the present invention, since the permanent magnet for adsorbing and holding the fragments of the amorphous magnetic alloy is attached to the outer surface of the lower portion of the tank, the magnet can be easily replaced when it deteriorates. There is an advantage that can be. Further, according to the present invention, a magnet having no oil resistance such as a rubber magnet can be used.

Further, according to the present invention, since the magnet is attached to the outer surface of the tank, the magnet can be removed after the electric device is installed.

Particularly, as described in claim 2 or 3, the bottom plate of the tank is formed of a non-magnetic material and a magnet is attached to the outer surface of the bottom plate, or a non-magnetic member is attached to the lower part of the tank made of a magnetic material. By embedding and positioning the pair of magnetic poles of the magnet on both sides of the non-magnetic member, the magnetic flux generated from the magnet was introduced into the oil in the tank. There is an advantage that a strong magnetic attraction force can be applied to the to improve the effect of trapping debris.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a bottom view of FIG.

[Explanation of symbols]

 1 Tank 1a Side Wall 1b Bottom Plate 1c Cover 2 Transformer Main Body 3 Insulating Oil 10 Non-Magnetic Member 11 Permanent Magnet

Claims (3)

[Scope of utility model registration request] 1. An oil-filled static induction electric device, wherein a main body of a static induction electric device using an iron core made of an amorphous magnetic alloy ribbon is stored together with insulating oil in a tank. An oil-filled static induction electric device, characterized in that a permanent magnet that attracts and holds it is attached to the outer surface of the lower part of the tank. 2. The oil-filled static induction electric device according to claim 1, wherein at least a bottom plate of the tank is made of a non-magnetic material, and the permanent magnet is attached to an outer surface of the bottom plate of the tank. 3. The tank is made of a magnetic material,
A non-magnetic member is embedded in a part of the lower portion of the tank, and the permanent magnets are attached to an outer surface of the tank with the pair of magnetic poles positioned on both sides of the non-magnetic member. Item 1. The oil-filled static induction electric device according to Item 1.