JP2569090Y2 - Tap change tool for transformer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for changing the voltage to be transmitted by changing the mounting position of a tap plate in a transformer tap disposed inside a transformer. The present invention relates to a transformer tap switching tool for gripping and rotating a tap nut.

[0002]

2. Description of the Related Art Generally, a transformer tap is provided inside a pole transformer, and the transformer tap maintains a secondary voltage at an appropriate voltage according to a primary voltage of a distribution line. The transmission voltage is changed by switching the mounting position of the tap plate each time with the construction of new transformers, the expansion of substations, and the expansion of distribution lines.

Conventionally, the work of switching the transformer tap in such a pole transformer has been performed, for example, as follows. That is, first, the lid of the pole transformer is opened, the hand is put into the insulating oil injected into the transformer container, and two tap nuts of the transformer tap buried in the insulating oil are removed. Loosen with pliers and remove the tap plate. Then, the tap plate is moved with bare hands, each tap nut is screwed into the two tap screws at the changed position, the tap plate is attached, and each tap nut is tightened again with pliers. Thereafter, by closing the lid, the tap switching operation is completed.

[0004]

However, in the conventional tap change operation as described above, the operation must be performed by putting a hand in insulating oil and turning a tap nut with pliers. However, since it is easy to slip due to the insulating oil, it is necessary to pay close attention so as not to drop the tap plate, and there is a problem that workability is poor because the work requires a long time. Moreover, even if you wipe off the insulating oil that has arrived on your hands with a rag, you cannot wipe it completely, so when you wear gloves later, your hands become slippery,
This kind of work is not only dangerous because it is often performed on a pillar, and there is also a problem that the smell of oil does not escape even after several hours from the work and the working environment is poor.

The present invention has been made in view of such a conventional problem, and the tap nut can be securely attached and detached without directly touching the insulating oil, and the tap plate may be dropped. It is an object of the present invention to solve the above-mentioned problem by providing a transformer tap switching tool capable of performing tap switching work easily and quickly without any problem.

[0006]

In order to achieve the above object, a tap change tool for a transformer according to the present invention is attached to a tap table provided inside a transformer and is connected to an anode or a cathode of a transmission line. Attach and remove two tap nuts that are screwed to one tap screw on the anode side and one tap screw on the cathode side selected from three or more tap screws individually connected to any of the sides. In a transformer tap switching tool used for tap switching of a transformer capable of changing a voltage to be transmitted by connecting a tap screw in which both tap nuts are screwed together by a tap plate engaging and holding the tap nut, A collet chuck having a nut insertion hole into which the tap nut is inserted at an end thereof, and a collet chuck having a distal end screwed to a base end of the collet chuck so as to be relatively movable in the axial direction. A cylindrical body provided with a working shaft, a tapered receiving portion for loosely fitting to the operation shaft and abutting against a tapered portion provided on the outer peripheral surface of the collet chuck to reduce the nut insertion hole; A shaft movement preventing member provided between the shaft and the shaft for allowing rotation of the operating shaft but preventing movement in the axial direction, and a rotation preventing member for preventing rotation of the collet chuck provided on the cylindrical body. It is characterized by having.

[0007]

The gripping body is gripped by one hand and the operating shaft is gripped by the other hand, and the collet chuck is inserted into the insulating oil in the transformer container. Then, the nut insertion hole at the tip of the collet chuck is fitted to one tap nut fixing the tap plate to the tap table, and the operation shaft is rotated. At this time, since the shaft movement preventing member is provided between the cylinder and the operation shaft, the operation shaft rotates without moving in the axial direction, and the cylinder has a rotation that prevents the rotation of the collet chuck. Since the blocking member is provided, the collet chuck is moved in the axial direction by the rotation of the operation shaft. Then, by turning the operation shaft and pulling the collet chuck into the cylindrical body, the tapered portion of the collet chuck comes into contact with the tapered receiving portion of the cylindrical body, whereby the nut insertion hole is reduced and the tap nut is gripped. In this state, by releasing the hand from the operation shaft and turning the cylinder with the hand holding the cylinder, the tap nut is turned and loosened, and the tap nut is removed from the tap screw as it is. Thereafter, the operation shaft is turned in the opposite direction to feed the collet chuck out of the cylinder, so that the nut insertion hole can be enlarged and the tap nut can be removed from the collet chuck.

Similarly, the nut insertion hole is fitted to the other tap nut, and the operating shaft is rotated to pull the collet chuck into the cylinder, whereby the nut insertion hole can be reduced and the tap nut can be gripped. . Then, the tap nut is loosened by turning the cylinder, and the tap nut is removed from the tap screw as it is, whereby the tap plate is removed from the tap base. At this time, since the other tap nut is still held by the collet chuck, the tap plate with which this tap nut is engaged and held and one tap nut are not dropped. While holding the other tap nut with the collet chuck, change the tap position, align the other tap nut with the changed one tap screw, turn the cylinder, and screw the tap nut to the tap screw. And tighten. Then, after removing the other tap nut from the collet chuck,
By similarly tightening one of the tap nuts, this transformer tap switching operation is completed.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 7 show an embodiment of the present invention. FIG. 1 is an exploded perspective view showing the entire structure, FIG. 2 is a front view showing the same upper half section, and FIG. 3 is an enlarged view. 4 is a cross-sectional view showing an embodiment of the protective cover, FIG. 5 is a perspective view showing an example of a tap plate, FIG. 6 is a front view showing a tap nut and a tap plate, and FIG. It is a top view showing a tap board.

First, the configuration will be described. 1 to 3, reference numeral 1 denotes a collet chuck. The collet chuck 1 is formed of a pipe-shaped member having a large diameter portion 1a and a small diameter portion 1b which are continuous in the axial direction.
A tapered portion 1c is formed in a portion continuous with the first portion, and a cross-shaped slit 1d extending from the large-diameter portion 1a side to a middle portion of the small-diameter portion 1b is provided. On the large-diameter portion 1a side of the collet chuck 1, a nut insertion hole 2 formed of a hexagonal concave portion opened on an end face thereof is formed, thereby forming a grip portion for gripping a tap nut 37 described later. ,
A screw portion 3 provided with a female screw is provided on the inner peripheral surface on the small diameter portion 1b side. The nut insertion hole 2 needs to be formed slightly larger than the tap nut, and since tap nuts generally used are 8 to 10 mm, the nut insert holes 2 have a size that allows easy insertion of those tap nuts. However,
The shape of the nut insertion hole 2 is not limited to a hexagon, but can be formed in a square or other various shapes according to the shape of the nut to be used. Further, the shape of the slot 1d of the gripping portion is not limited to the above embodiment, and various shapes such as a one-letter shape and a Y-shape can be applied.

A screw shaft portion 5 of an operating shaft 4 provided with a male screw which can be screwed to the female screw is screwed into the screw portion 3 of the collet chuck 1. The screw shaft portion 5 is formed at the distal end of the operation shaft 4, and an operation knob 6 is fitted to the base end, and is fixed by a spring pin 7 to be integrally formed. The inner sleeve 8 is fixed to the inside of the operation knob 6 by fixing means such as welding to be integrally formed. Inner sleeve 8
Is provided with a step portion having a small diameter at the base end side, and the outer sleeve 9 is fitted to the small diameter portion. Outer sleeve 9
Has an inner flange 9a that is locked to the step of the inner sleeve 8, and prevents the inner flange 9a from moving in the axial direction by the step and the operation knob 6 to prevent the outer sleeve 9 from coming off. The operation knob 6, the inner sleeve 8, and the outer sleeve 9 constitute an axial movement preventing member that permits the rotation of the operation shaft 4 but prevents the operation shaft 4 from moving in the axial direction.

The outer sleeve 9 has a pipe-like cylindrical body 10.
Are fixed integrally by a fixing means such as welding, and a fixed sleeve 11 is fitted around the inner periphery of the base end, and the fixed sleeve 11 is fixed to the fixing means such as welding. And are integrally formed. A fixed knob 12 is fitted around the outer periphery of the fixed sleeve 11,
The fixing knob 12 is fixed to the fixing sleeve 11 with a fixing screw 13 to be integrally formed. A fastening tube 14 having a tapered receiving portion 14a which comes into contact with the tapered portion 1c of the collet chuck 1 is fixed to the tip of the cylindrical body 10 by a fastening means such as welding and is integrally formed. By preventing the collet chuck 1 from moving toward the cylinder 10 and reducing the diameter of the gripping portion at 14, the nut insertion hole 2 can be reduced and the tap nut can be gripped. A fixing pin 15 which is inserted into one of the slits 1d of the collet chuck 1 and protrudes inward in the radial direction is fixed to the tightening tube 14, thereby preventing the rotation of the collet chuck 1 and preventing the shaft from rotating. It constitutes a rotation preventing member that allows only movement in the direction.

Reference numeral 16 shown in FIG. 4 is a protective case of the transformer tap change tool having the above-described configuration. The protective case 16 is used for storing or transporting the transformer tap switching tool. The protective case 16 includes a case tube 17 into which the collet chuck 1 side beyond the fixed knob 12 is inserted, and a case tube 17.
The end cap 18 is fitted and fixed to the tip of the end cap, and a hook 19 fixed to the end cap 18. The hook 19 is attached to the end cap 18.
A screw shaft portion 20 penetrating the end face plate of
And a hook portion 21 formed in an arc shape that is continuous with the outer end of the end plate, and the hook 19 is fixed to the center of the end plate by a fastening nut 22 disposed outside the end plate and a fixing nut 23 disposed inside. doing. The fixing nut 23 is set at a position corresponding to the tip of the inserted collet chuck 1, and at the time of insertion, the nut insertion hole of the collet chuck 1 is reduced to hold the fixing nut 23. This prevents the transformer tap switching tool from falling out of the protection case 16 and enables the hook 21 to be hooked to a latch or the like screwed to a wall or the like.

FIG. 5 shows a specific example of a tap table provided inside a pole transformer in which the transformer tap switching tool is used, and is formed of an insulating material such as porcelain. . The tap table 25 includes a plate portion 26 formed in a flat plate shape, and leg portions 27 formed at both ends of the plate portion 26. Fixing screws (not shown) penetrating through mounting holes provided in both leg portions 27. ) Is fixed inside the pole transformer. The plate portion 26 is provided with a plurality of (up to ten in this embodiment) through holes vertically penetrating, terminal screws 28 and 29 in the through holes at both ends, and tap screws 30a to 30 through the remaining through holes. The terminal screws 28 and 29 and the tap screws 30a to 30d and 31a to 31d are fastened by the common nut 32 and fixed to the plate portion 26.
An electric wire 33 connected to the anode side of the transmission line is wound around one terminal screw 28, and an electric wire 33 connected to the cathode side of the transmission line is wound around the other terminal screw 29. It is tightened and connected by a nut 34.

The four tap screws 30a to 30d provided on one side of the plate portion 26 are connected to the terminal screws 28 on the anode side via electric wires connected to a transformer (not shown), respectively. The four tap screws 31a to 31d arranged on the side are respectively connected to the terminal screws 29 on the cathode side via electric wires similarly connected to the transformer. Therefore, for example, the first tap screw 30a on the anode side
By connecting the first tap screw 31a on the cathode side with the tap plate 35, a voltage of 6000 volts can be transmitted, and the fourth tap screw 30d on the anode side and the fourth tap screw 31d on the cathode side can be connected. Is connected by the tap plate 35, a voltage of 6900 volts can be transmitted.

The tap plate 35 is formed of a highly conductive member such as a copper plate into a shape as shown in FIGS. 6 and 7, and has a bifurcated portion 36 formed at both ends of a long and thin plate material. The forked portion 36 is opposed in the same direction. Each of the forked portions 36 has a tap screw 30a.
Nut 3 that can be screwed into 30d, 31a-31d
7 are respectively engaged and held. Tap nut 37
Has a hexagonal head portion 38 and a tubular portion 39 having a screw thread on the inside for screwing with a tap screw. Bifurcated part 3
Numeral 6 is engaged with the cylindrical portion 39, and the inward protruding portion provided at the tip of each forked portion 36 narrows the gap to prevent the tap nut 37 from coming off.

The transformer tap switching tool having the above configuration can be assembled, for example, as follows. First, the screw portion 3 of the collet chuck 1 is screwed into the screw shaft portion 5 of the operation shaft 4, and the inner sleeve 8 side of the operation shaft 4 is tightened with a tightening tube 14.
The small diameter portion of the inner sleeve 8 is projected from the outer sleeve 9 from the side. Next, the operation knob 6 is fitted into the small-diameter portion of the inner sleeve 8, and a spring pin (not shown) is press-fitted into a pin hole provided through both members in common. Fixed to. Next, one of the slits 1d of the collet chuck 1 is aligned with a pin hole provided in the tightening tube 14, and the stop pin 15 is driven into engagement with one of the slits 1d. Thus, the assembly of the transformer tap switching tool is completed.

Next, the operation of the present embodiment will be described.
The tap change tool for a transformer according to the present invention is used for so-called tap change work in which a mounting position of the tap plate 35 is changed when a voltage tap zone is changed by newly installing, relocating, and changing a system of a high voltage automatic voltage regulator (SVR). It is used for new installation of pole transformers and tap change work at the time of reloading.

First, the case where the tap plate 35 is removed from the tap base 25 will be described. After opening the lid of the pole transformer, the holding knob 12 is gripped by one hand and the operating knob 6 is gripped by the other hand, and the collet chuck 1 is inserted into the insulating oil in the transformer container. . And tap stand 25
One tap nut 37 fixing the tap plate 35 to the
Then, the nut insertion hole 2 at the tip of the collet chuck 1 is fitted to the collet chuck 1, and the operation knob 6 is rotated in a direction to pull the collet chuck 1 into the cylindrical body 10. At this time, between the cylinder 10 to which the fixed knob 12 is fixed and the operation shaft 4 to which the operation knob 6 is fixed, an axial movement preventing member composed of the operation knob 6, the inner sleeve 8 and the outer sleeve 9 is provided. , The operation shaft 4
Rotates without moving in the axial direction. At the same time,
A stop pin 15 serving as a rotation preventing member is fixed to a tightening tube 14 integral with the cylindrical body 10 and the stop pin 15 is slit.
d, the rotation of the collet chuck 1 is prevented by the rotation of the operation shaft 4.
Moves in the axial direction without rotating.

The rotation of the operation shaft 4 causes the collet chuck 1 to rotate.
When the tapered portion 1c of the collet chuck 1 comes into contact with the tapered receiving portion 14a of the cylindrical body 10 by pulling the nut into the cylindrical body 10, the gripping portion is reduced in diameter by the tapered receiving portion 14a, so that the nut insertion hole 2 is formed. The tap nut 37 is held by the collet chuck 1. In this state, when the user releases the operation knob 6 and turns the cylinder body 10 side with the hand holding the fixed knob 12, the collet chuck 1 is integrally rotated in the same direction via the stopper pin 15, thereby forming the tap nut. 37 is turned in the same direction and loosened. And
By turning the fixing knob 12 as it is, the tap nut 37 can be removed from the tap screw 30 (or 31). Thereafter, by holding the operation knob 6 and the fixed knob 12 by hand and turning the operation shaft 4 in the opposite direction, the collet chuck 1 is sent out from the cylindrical body 10 and the nut insertion hole 2 is enlarged, so that the tap nut is removed from the collet chuck 1. 37 can be removed.

Next, the nut insertion hole 2 is fitted into the other tap nut 37, and similarly, the operating shaft 4 is rotated to draw the collet chuck 1 into the cylindrical body 10, thereby making contact with the tapered portion 1c. The nut insertion hole 2 is reduced by the operation of the taper receiving portion 14a, and the tap nut 37 is gripped by the collet chuck 1. Then, the tap nut 37 is loosened by turning the cylinder body 10 side via the fixing knob 12, and the tap nut 37 is continuously turned and the tap nut 37 is turned to the tap screw 31.
By removing the tap plate 35 from the tap table 25, the tap plate 35 is detached from the tap base 25. At this time, the two tap nuts 37 are disengaged from the two tap screws 30 and 31 and the tap plate 35 is in a free state, but one tap nut 37 is still held by the collet chuck 1. Therefore, the tap plate 35 in which the tap nut 37 is engaged and held does not separate from the other tap nut 37, and therefore, there is no possibility that the tap plate 35 is dropped.

Thereafter, while the one tap nut 37 is held by the collet chuck 1, the tap position is changed, and the tap nut 37 is aligned with the changed one tap screw 30 (or 31) and fixed. By turning the knob 12, the tap nut 37 is screwed into the tap screw 30 and tightened. Next, after removing the tap nut 37 from the collet chuck 1, the other tap nut 37 is similarly aligned with the other tap screw 31 (or 30), and the fixing knob 12 is turned to attach the tap nut 37 to the tap screw 31. Screw and tighten. Thus, the work of switching the transformer taps is completed.

When the transformer tap switching tool is used, hands are not directly put into the insulating oil, so that the dirty working environment such as oil adheres to the skin and work clothes. Can be improved, and the safety of work can be improved by eliminating the risk of slipping hands with oil. Moreover, even if the size of the tap nut is different,
The tap switching operation can be performed without replacing the collet chuck 1 at the tool tip, and the gripping of the nut is reliable and the switching operation can be performed using only this tool. The power outage time can be reduced. By the way, according to the experiment conducted by the present inventors, in the tap switching operation according to the conventional method,
The time required for one operation was 5 minutes and 30 seconds, but the time required when the transformer tap switching tool was used was 3 minutes and 30 seconds, which was almost half of the conventional operation time.

The transformer tap change tool according to the present invention is not limited to the above embodiment.
A screw shaft may be provided in place of the screw 3 of the collet chuck 1, and a screw may be provided in place of the screw shaft 5 of the operation shaft 4. Side is provided integrally with the protrusion, and the protrusion is slit 1d
It is good also as a structure made to engage with. Further, by storing the transformer tap switching tool in the protective case 16 after the end of the switching operation, etc., the collet chuck 1 is prevented from being damaged or deformed at the time of transportation or the like, thereby providing protection. In addition to the fact that the hanging hook 19 is used for hanging on the wall, the convenience of storage can be improved.

[0025]

Advantages of the Invention As described above, the present invention is configured as described above, and has the following effects. That is, by rotating the operating shaft relative to the cylindrical body and moving the collet chuck forward and backward, the nut insertion hole of the collet chuck can be reduced or enlarged to grip or release the tap nut. Even if the tap nuts have different sizes, they can be reliably gripped and rotated. In addition, since the tap nut is rotated while being held by the collet chuck, there is no danger that the tap nut and the tap plate will be dropped when the tap nut is attached or detached. The work time can be shortened by improving workability. Furthermore, since the tap change operation can be performed by inserting the collet chuck into the insulating oil, there is no need to work by directly inserting the hand into the insulating oil, so that oil does not adhere to hands or work clothes. A pressure transformer that can prevent and prevent oil stains at the time of work and improve the work environment, and can also eliminate the risk of slipping hands with oil and improve work safety. A dexterous tap switching tool can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an entire configuration showing an embodiment of the present invention.

FIG. 2 is a front view showing a cross section of the upper half.

FIG. 3 is an enlarged left side view of the same.

FIG. 4 is a cross-sectional view showing one embodiment of a protective cover used for the transformer tap switching tool according to the embodiment of FIG. 1;

FIG. 5 is a perspective view showing an example of a tap plate.

FIG. 6 is a front view showing a tap nut and a tap plate.

FIG. 7 is a plan view showing a tap nut and a tap plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Collet chuck 1a Large diameter part 1b Small diameter part 1c Taper part 1d Slot 2 Nut insertion hole 3 Screw part 4 Operation shaft 5 Screw shaft part 6 Operation knob 8 Inner sleeve 9 Outer sleeve 9a Inner flange 10 Cylindrical body 10a Taper receiving part 11 Fixing sleeve 12 Fixing knob 13 Fixing screw 14 Tightening tube 14a Tape receiving portion 15 Locking pin 16 Protective case 17 Case cylinder 18 End cap 19 Hook 20 Screw shaft 21 Hook 22 Co-tightening nut 23 Fixing nut Reference Signs List 25 Tap stand 26 Plate part 27 Leg part 28 Terminal screw 29 Terminal screw 30 30a-30d 30a-30d Tap screw 31 31a-31d 31a-31d Tap screw 32 Coupling nut 33 Electric wire 34 Tightening nut 35 Tap plate 36 Bifurcation 37 Tap nut 39 cylinder

Claims (1)

(57) [Scope of request for utility model registration] 1. An anode selected from three or more tap screws attached to a tap base disposed inside a transformer and individually connected to either an anode side or a cathode side of a transmission line. Plate that attaches and detaches two tap nuts screwed to one tap screw on the side and one tap screw on the cathode side, and engages and holds the tap nut between the tap screws into which both tap nuts are screwed. A transformer tap switching tool used for switching the tap of a transformer capable of changing a voltage to be connected and transmitted by a collet chuck provided with an opening at a tip end of a nut insertion hole into which the tap nut is inserted, An operating shaft having a distal end screwed to the base end of the collet chuck and connected so as to be relatively movable in the axial direction, and a tapered portion loosely fitted to the operating shaft and provided on the outer peripheral surface of the collet chuck. A cylindrical body provided with a tapered receiving portion for reducing the nut insertion hole in contact with the shaft, and a shaft for allowing rotation of the operating shaft provided between the cylindrical body and the operating shaft but for preventing movement in the axial direction; A tap switching tool for a transformer, comprising: a movement preventing member; and a rotation preventing member for preventing rotation of the collet chuck provided on the cylindrical body.