JPH10275731A - Oil-immersed electrical equipment and pole transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil-immersed electrical equipment wherein, with less number of parts, switching operation is done with a simple structure. SOLUTION: In an insulating oil 8 inside a transformer vessel 1, a transformer main body 3 and an on-road tap changer 5 are allocated. At a periphery part 1a of the transformer vessel 1, an operation axis supporting structure member 9 which supports an operation axis is attached. The operation axis supporting structure member 9 comprises a blockage member 11 which blocks a through hole 10 provided at the periphery wall part and a bearing holder 12 which supports the operation axis 6 while provided at the blockage member 11. Attaching angle θ of the bearing part of bearing holder 12 to the blockage member 11 is so set that the operation axis 6 linearly extends from the bearing holder 12 toward the rotation axis 51 of the on-load tap changer 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-filled electric device and a pole transformer in which an electric device main body and a switching device requiring a switching operation are arranged in insulating oil filled in a container. It is.

[0002]

2. Description of the Related Art FIG. 5A shows a pole transformer in which two transformer bodies T1 and T2 and a load tap changer TC are arranged in insulating oil (a typical example of oil-filled electric equipment). Among them, this is a pole transformer according to the proposal of the inventor, which has made it possible to operate the on-load tap changer TC as a changeover device from outside the transformer container C. In this pole-mounted transformer, an operation shaft support structure member SM for supporting the operation shaft S extending of the on-load tap changer TC is attached to the cover member CM of the transformer container C. When the operation shaft support structure member SM is provided on the cover member CM as in this structure, not only is the workability at the time of switching poor, but also when the cover member is provided with the high-pressure cutout HVC, the operation shaft support structure member SM and There is a problem that the handle H is in the way.

[0003] The inventor of the present invention has proposed to attach an operation shaft support structure member SM to a peripheral wall of a transformer container as shown in Fig. 5B. With this structure, workability at the time of switching is improved, and a high-pressure cutout or bushing for three phases can be easily attached to the cover member CM of the transformer container C.

[0004]

However, FIG. 5 (B)
In the above-mentioned pole-mounted transformer, the operation shaft supporting structure member SM is horizontally mounted on a peripheral wall portion located above the oil level of the transformer container C, and the two divided operation shafts S1 and S2 are formed by a bevel gear gear mechanism. It is connected via G. However, in such a structure, since the gear mechanism G is required, not only the number of parts is increased but also the problem that the structure is complicated occurs.

[0005] If the handle H is left attached as in the prior art, there is a problem that the switching operation is performed by mischief.

An object of the present invention is to provide an oil-filled electric device and a pole transformer which can be switched by a simple structure with a small number of parts.

It is another object of the present invention to provide an oil-filled electric device in which a switching operation is not performed by mischief.

Another object of the present invention is to provide a safe oil-filled electrical device that can reliably ground an operation shaft.

It is still another object of the present invention to provide an oil-filled electrical device in which the operation shaft support structure member can be easily mounted and the number of mounting components is small.

[0010]

SUMMARY OF THE INVENTION According to the present invention, there is provided an electric appliance main body and a switching device requiring a switching operation are disposed in insulating oil filled in a container, and the switching device is operated from outside the container. The operating shaft supporting structure member rotatably supporting the operating shaft of the container is connected to the inside of the container through a through hole for mounting a supporting structure member formed in a peripheral wall portion of the container located above the level of the insulating oil. An oil-filled electrical device attached to the peripheral wall portion of the container so as to be introduced into the container is targeted for improvement.
Transformers and circuit breakers are examples of this type of oil-filled electrical equipment.

In the present invention, the operating shaft support structure member is constituted by a closing member for closing the through hole provided in the peripheral wall portion, and a bearing holder provided on the closing member to support the operating shaft.
The mounting angle of the bearing portion of the bearing holder with respect to the closing member is determined such that the operation shaft extends linearly from the bearing holder toward the operation shaft connecting portion of the switching device. From another point of view, the mounting angle of the bearing holder with respect to the closing member or the mounting angle of the bearing holder with respect to the peripheral wall of the container is determined so that the operation shaft enters the insulating oil obliquely from above the liquid level.
When a general switching device is used, the support for supporting the switching device on the main body of the electric device supports the switching device in a posture in which the axis of the rotating shaft for operation of the switching device coincides with the axis of the operating shaft. It may be configured as follows. In this way, there is no need to specially design the switching device.

According to the present invention, the operating shaft and the operating shaft connecting portion of the switching device can be directly connected without using a gear mechanism. As a result, the number of parts is reduced and the structure is simplified.

When operating a switching device such as an on-load tap changer, leakage current may flow through the operating shaft. Therefore, it is necessary to completely ground the operation shaft. It can be grounded via the bearing part of the bearing holder, but since there is a gap between the operating shaft and the bearing part,
Low grounding reliability. Therefore, in order to ensure grounding, in the present invention, the closing member and the bearing holder are formed of a metal material. Then, the closing member is fixed to the peripheral wall portion of the container by screwing or welding, and the closing member and the container are electrically connected. Then, the operating shaft is brought into strong contact with the outer surface of the operating shaft portion located above the oil level of the insulating oil at a position distant from the bearing holder to the switching device side at a portion located in the container of the bearing holder. A grounding member is attached to the ground through a bearing holder, a closing member and a container. With this configuration, the operation shaft can be reliably grounded.

In order to prevent mischief, a handle mounting portion for detachably attaching a handle is provided at an end of the operating shaft which comes out of the bearing holder, and a cover member capable of detaching the handle mounting portion when the switching device is not operated. Just cover it. In this way, mischief can be prevented. Even if the cover member is not provided, mischief can be prevented if there is no handle, but if the surface of the handle attachment portion is corroded, it becomes difficult to attach the handle. Therefore, it is preferable to cover the handle attachment portion with the cover member.

The structure for attaching the closing member to the peripheral wall is arbitrary. However, since it is preferable to minimize the number of welding portions to the container, it is preferable to fix the closing member to the peripheral wall portion by bolting. In this case, it is conceivable that a nut member is welded to the outer surface of the peripheral wall portion, and a bolt penetrating the closing member is screwed into the nut member to attach the closing member to the peripheral wall portion of the container. However, also in this case, there is a problem that the number of welding points and the number of parts increase. Therefore, in order to solve this, a plurality of screw holes for attachment are formed in a portion facing the peripheral wall portion of the closing member. Then, bolt insertion holes are formed around the through holes in the peripheral wall portion of the container so as to correspond to the plurality of screw holes. In this way, the closing member is attached to the peripheral wall portion by bolts inserted into the bolt insertion holes and the screw holes from inside the peripheral wall portion. This reduces welding to the container and
The number of parts can be reduced.

According to the present invention, a transformer body and a load tap changer are arranged in insulating oil filled in a transformer container, and an operation for operating the load tap changer from outside the transformer container is provided. An operating shaft supporting structure member rotatably supporting the shaft is connected to the transformer container through a through hole for mounting a supporting structure member formed in a peripheral wall portion of the transformer container located above the level of the insulating oil. Also when applied to a pole transformer attached to the peripheral wall portion of the transformer container so as to be introduced into the inside of the, the operating shaft support structure member, a closing member that closes the through hole, and a closing member are provided on the closing member And a bearing holder for supporting the operating shaft. Then, the mounting angle of the bearing holder with respect to the peripheral wall portion of the transformer container is determined so that the operation shaft extends linearly toward the operation shaft coupling portion of the on-load tap changer.

[0017]

FIG. 1 is a schematic diagram showing an example of an embodiment in which the present invention is applied to a pole transformer. In the figure, 1 is a transformer container, and 2 and 3 are three-phase transformer bodies, respectively. The transformer bodies 2 and 3 are arranged so as to overlap one another vertically, and a load tap changer 5 as a switching device is mounted on the upper part of the upper transformer body 3 via a support 4. The load tap changer 5 is connected to the transformer main body 3.
Are connected to a plurality of taps provided on the U-phase winding and the W-phase winding on the primary side, and these taps are switched to change the output voltage. Although the configuration of the on-load tap changer 5 is arbitrary, FIGS. 2A to 2D show a front view, a plan view, a bottom view, and a right side view of an example of the on-load tap changer 5. The on-load tap changer 5 rotates the rotating shaft 51 by rotating the rotating shaft 51, and rotates the movable contact conductor 53 with the rotation of the rotating plate 52, and connects the movable contact 53 a to the winding tap. Are connected to the plurality of fixed contact pairs 54... Connected to the current limiting resistors 55 and 56 and the taps are switched. The load tap changer 5 is configured to quickly switch taps by using the spring force of the spring 58.

The on-load tap changer 5 includes a frame 5
9 is attached to the support 4 shown in FIG. 1 and fixed on the transformer main body 3. As shown in FIG.
1 is connected to a distal end of an operating shaft 6 via a joint 7. The shape of the support 4 is determined so that the axis of the rotating shaft 51 and the axis of the operation shaft 6 match. The transformer bodies 2 and 3 and the on-load tap changer 5 are immersed in the insulating oil 8. In FIG. 3, the handle H is not attached to the outer end of the operation shaft 6.

Reference numeral 9 denotes an operation shaft support structure member for rotatably supporting an operation shaft 6 for operating the load tap changer 5 from outside the transformer container 1. The operating shaft 6 passes through the through hole 10 for mounting the supporting shaft formed in the peripheral wall portion 1a of the transformer container 1 located above the liquid level of the insulating oil 8, that is, the oil level 8a. Is mounted on the peripheral wall portion 1a so as to be introduced into the transformer container 1. The operation shaft support structure member 9 includes a metal closing member 11 for closing the through hole 10, and a metal bearing holder 12 provided on the closing member 11 to support the operation shaft 6. The mounting angle θ of the bearing holder 12 with respect to the peripheral wall portion 1a of the transformer container 1 or the mounting angle of the bearing holder 12 with respect to the closing member 11 is operated toward the rotating shaft 51 constituting the operating shaft connecting portion of the tap changer 5 under load. The shaft 6 is defined to extend linearly. The closing member 11 is bolted to the mounting recess 1b provided in the peripheral wall portion 1a of the transformer container 1 from inside the transformer container 1 by bolts 13. In the example of FIG.
Are connected by welding. Reference numeral 14 denotes a rubber packing.

FIG. 4 shows a structure using an operating shaft supporting structure member in which the closing member 11 and the holder main body 12a of the bearing holder 12 are integrally formed by casting. A plurality of screw holes 15 for attachment are formed in the portion facing the peripheral wall portion 1a of the closing member 11 at intervals in the circumferential direction, and a plurality of screw holes 15 are provided around the through hole 10 in the peripheral wall portion 1a. Bolt insertion holes 16 are formed corresponding to the small holes 15. The closing member 11 is formed by the bolts 13 inserted into the bolt insertion holes 16 and the screw holes 15 from inside the peripheral wall portion 1a.
Is attached to the peripheral wall portion 1a. 17 are washers.

A portion of the holder main body 12a of the bearing holder 12 located in the transformer container 1 includes an operating shaft 6 located above the liquid level at a position away from the bearing holder 12 toward the load tap changer 5 side. The grounding member 18 which makes strong contact with the outer surface of the portion is screwed. The grounding member 18 is formed by bending a strip-shaped metal piece having a spring property, and its base is screwed to the holder main body 12a using a screw 19. When the grounding member 18 comes into strong contact with the operating shaft 6 in the air, the operating shaft 6 is mounted on the bearing holder 12, the closing member 11, the bolt 13, the washer 17, and the transformer container 1.
Through the ground.

A bearing portion 20 is formed inside the holder body 12a. The operating shaft 6 is provided outside the bearing portion 20.
Is formed with an enlarged diameter portion 22 for accommodating two O-rings 21 fitted to the outer periphery of the O-ring. At the end of the enlarged diameter portion 22,
A tubular bush 23 is fitted to prevent the end of the operation shaft 6 from rattling. A large nut 24 forming a handle mounting portion is screwed into an end of the operation shaft 6 protruding from the bearing holder 12, and the nut 24 is screwed into a screw portion formed at the end of the operation shaft 6. It is fixed to the end of the operation shaft 6 by the combined lock nut 25. An annular fitting groove 26 is formed at the outer end of the holder main body 12a at a position surrounding the periphery of the bush 23.
A rubber or metal cover member 27 is detachably fitted to 6. The cover member 27 covers the handle mounting portion when the on-load tap changer 5 is not operated. When attaching the handle, the cover member 27 may be removed and the nut fitting recess of the handle may be fitted to the nut 24.

In the above example, the present invention is applied to an oil-filled pole transformer, but the present invention can of course be applied to other oil-filled electric devices such as a circuit breaker.

[0024]

According to the first and sixth aspects of the present invention, the operating shaft and the operating shaft connecting portion of the switching device can be directly connected without using a gear mechanism, so that the number of parts is reduced and the structure is reduced. A simple oil-filled electric device and a pole transformer can be obtained. According to the invention of claim 2, there is an advantage that the operation shaft can be reliably grounded. According to the third aspect of the present invention, it is possible to prevent the switching device from being operated by mischief. Further, according to the invention of claim 4, there is an advantage that the mounting structure of the operation shaft support structure member is simplified. Further, according to the invention of claim 5, the present invention can be applied to an oil-filled electric device using a general switching device.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an example of an embodiment in which the present invention is applied to a pole transformer.

FIGS. 2A to 2D are a front view, a plan view, a bottom view, and a right side view of an example of a load tap changer.

FIG. 3 is a schematic enlarged view of a main part of the embodiment of FIG. 1;

FIG. 4 is an enlarged sectional view showing another example of the operation shaft support structure member.

FIGS. 5A and 5B are diagrams showing the structure of a pole transformer as a prior art of the present invention proposed by the inventor, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transformer container (oil-filled electrical equipment) 2, 3 Transformer main body 4 Supporting tool 5 Tap changer under load (switching device) 6 Operating shaft 8 Insulating oil 9 Operating shaft support structural member 10 Mounting hole 11 Closure member 12 Bearing holder 18 Grounding member 25 Cover member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takaki Saito 2-182 Watanabe-dori, Chuo-ku, Fukuoka City, Fukuoka Prefecture Inside Kyushu Electric Power Company (72) Inventor Toshifumi Nishi Hanamigahama, Fukuma-cho, Munakata-gun, Fukuoka Prefecture 2-1-1 Kyushu Transformer Co., Ltd. (72) Inventor Tatsuo Tarumi 2-1-1 Hanamihama, Fukuma-cho, Munakata-gun, Fukuoka Prefecture Kyushu Transformer Co., Ltd.

Claims (6)

[Claims] An electric device main body and a switching device requiring a switching operation are arranged in insulating oil filled in a container, and an operation shaft for operating the switching device from outside the container is rotatable. An operation shaft supporting structure member for supporting the operation shaft is introduced into the inside of the container through a through hole for mounting a support structure member formed in a peripheral wall portion of the container located above the liquid level of the insulating oil. An oil-filled electric device attached to the peripheral wall portion of the container so that the operation shaft support structure member is provided on the closing member for closing the through hole and the closing member to support the operation shaft. And a mounting angle of the bearing portion of the bearing holder with respect to the closing member is determined such that the operation shaft extends linearly from the bearing holder toward an operation shaft coupling portion of the switching device. Oil-filled electrical equipment characterized by being used. 2. The closure member and the bearing holder are formed of a metal material, the closure member is fixed to the peripheral wall portion of the container by screwing or welding, and a portion of the bearing holder located in the container. At a position distant from the bearing holder to the switching device side, makes strong contact with the outer surface of a portion of the operation shaft located above the liquid level, and moves the operation shaft to the bearing holder, the closing member and The oil-filled electric device according to claim 1, wherein a grounding member for grounding through the container is attached. 3. An end portion of the operating shaft, which protrudes outward from the bearing holder, is provided with a handle attaching portion for detachably attaching a handle, and the handle attaching portion is detached when the switching device is not operated. The oil-filled electrical device according to claim 1, wherein the electrical device is covered by a possible cover member. 4. A plurality of screw holes for attachment are formed in a portion of the closing member facing the peripheral wall portion, and around the through hole in the peripheral wall portion, the plurality of screw holes correspond to the plurality of screw holes. The oil filling according to claim 1, wherein a bolt insertion hole is formed, and the closing member is attached to the peripheral wall portion by a bolt inserted into the bolt insertion hole and the screw hole from inside the peripheral wall portion. Electrical equipment. 5. A support for supporting the switching device on the main body of the electric device, the supporting device supporting the switching device in a posture in which an axis of a rotating shaft for operation of the switching device coincides with an axis of the operating shaft. The oil-filled electrical device according to claim 1, wherein the electrical device is configured as follows. 6. An operation for operating the on-load tap changer from outside the transformer container, wherein the transformer main body and the on-load tap changer are arranged in insulating oil filled in the interior of the transformer container. An operation shaft support structure member rotatably supporting a shaft is provided with a through hole for mounting a support structure member formed in a peripheral wall portion of the transformer container located above a liquid level of the insulating oil. A pole transformer attached to the peripheral wall portion of the transformer container so as to be introduced into the transformer container, wherein the operation shaft support structure member includes a closing member closing the through hole and the closing member. A bearing holder provided on a member for supporting the operating shaft, wherein an angle of attachment of the bearing holder to the peripheral wall portion of the transformer container is directed toward an operating shaft connecting portion of the on-load tap changer. The operating axis Is defined as extending linearly.