JP2019102717A - Oil collection tool and oil collection method - Google Patents

Abstract

To provide an oil collection tool capable of efficiently collecting an insulation oil in a transformer in accordance with an indirect hot-line work, and an oil collection method.SOLUTION: An oil collection tool comprises an operation rod 2, an open-circuit claw 3, an oil collection pipe operation rod 4, a vacuum container 5, a cap 6, an oil collection pipe 7, a coupling member 8 and a stopper 9. The operation rod 2 includes a front end 11. The open-circuit claw 3 is mounted in the front end 11. The oil collection pipe operation rod 4 is movable in an axial direction of the operation rod 2. The vacuum container 5 is mounted in a front end of the oil collection pipe operation rod 4 and includes a seal 18 which seals the inside, in a front end. The cap 6 is inserted in such a manner that the vacuum container 5 is movable in the axial direction of the operation rod 2. The oil collection pipe 7 protrudes inside of the cap 6, includes a needle 19 which faces the seal 18, in a rear end and is fixed to the cap 6. The coupling member 8 couples the vacuum container 5 with the cap 6. The stopper 9 is mounted to the operation rod 2, penetrates the oil collection pipe 7 therein and faces the cap 6.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an oil production tool and an oil production method. More particularly, the present invention relates to a tool for producing oil and a method for producing oil for collecting insulating oil in a transformer.

  Transformers are installed on utility poles. The inside of the transformer is filled with insulating oil. In the past, insulating oils contained polychlorinated biphenyls (PCBs). In recent years, it has become known that PCBs are harmful to the human body, and work has been carried out to check whether insulating oil in existing transformers contains PCBs.

  Insulating oil check work is performed at the time of transformer inspection and replacement. In the insulation oil check work, the peripheral equipment is shut down, the transformer on the utility pole is removed from the utility pole, and it is lowered to the ground. Then, open the transformer and extract and analyze the insulating oil in the transformer.

  An apparatus and a method for collecting insulating oil in a transformer are disclosed, for example, in Japanese Utility Model Application Laid-Open No. 3-127241 (Patent Document 1).

  In the extraction container described in Patent Document 1, the inside is vacuumed by the vacuum dividing wall. One end of the needle is inserted into the vacuum extraction vessel and the other end of the needle is inserted into the oil. The pressure difference between the vacuum extraction vessel and the ambient air causes the oil to be injected into the extraction vessel. Then, a carrier gas is injected into the oil in the extraction vessel to extract the gas dissolved in the oil. Patent Document 1 describes that this enables effective extraction and analysis of oil in a transformer.

Japanese Utility Model Application Publication No. 3-127241

  However, in the conventional insulating oil confirmation work, the peripheral equipment was shut down, the transformer on the utility pole was removed from the utility pole, and it was dropped to the ground. At this time, all wires etc. connected to the transformer were removed, and the transformer was lowered to the ground by a crane. Therefore, it took several hours to check the insulating oil. Although Patent Document 1 discloses a method for extracting and analyzing a sample oil, there is no specific description on the collection of insulating oil in an actual transformer, and the work content is unknown.

  An object of the present invention is to provide an oil producing tool and an oil producing method capable of extracting insulating oil in a transformer efficiently by an indirect active wire construction method.

  The oil production tool of the present embodiment includes an operation rod, an open claw, a oil production pipe operation rod, a vacuum container, a cap, an oil production pipe, a connection member, and a stopper. The operating rod includes a tip. An open claw is attached to the tip. The oil collection tube operating rod is movable in the axial direction of the operating rod. The vacuum vessel is attached to the tip of the oil pipe operation rod and includes a seal that seals the inside at the tip. The cap is inserted so that the vacuum vessel can be moved in the axial direction of the operating rod. The oil collection pipe protrudes inside the cap, includes a needle at the rear end facing the seal, and is fixed to the cap. The connecting member connects the vacuum vessel and the cap. The stopper is attached to the operating rod, and the oil collection pipe penetrates to face the cap.

  The oil production method of the present embodiment is a method for collecting insulating oil in a transformer using the above-described oil production tool. The oil production method includes a bolt loosening step, a lid opening step, a oil collection pipe insertion step, and an oil collection step. In the bolt loosening process, loosen the lock bolt of the transformer lid. In the lid opening process, the lock bolt loosens the lid of the transformer where the lock bolt is loosened at the tip of the operation rod of the oil production tool and the opening claw. In the oil pipe inserting step, the oil pipe operating rod is operated to insert the tip of the oil pipe into the inside of the transformer whose lid is opened. In the oil collecting process, the oil collecting pipe operating rod is operated, the cap is pressed against the stopper, the needle of the oil collecting pipe penetrates the seal of the vacuum vessel, and the insulating oil in the transformer is collected.

  ADVANTAGE OF THE INVENTION The oil production tool and oil production method by this invention can extract the insulating oil in a transformer efficiently by an indirect active wire construction method.

FIG. 1 is a side view of the oil producing tool. FIG. 2 is an enlarged view of the vicinity of the tip of the operating rod. FIG. 3 is a side view of the oil collection tool when the oil collection pipe operating rod is pushed to the tip side. FIG. 4 is a perspective view of the vicinity of the vacuum vessel. FIG. 5 is a cross-sectional view taken along the line V-V in FIG. FIG. 6 is a perspective view showing the stopper. FIG. 7 is a side view of the lock bolt tightening and loosening tool attached to the operating rod. FIG. 8 is a side view of the lock bolt tightening and loosening tool. FIG. 9 is a perspective view of the lock bolt tightening and loosening tool. FIG. 10 is a view showing a bolt loosening process. FIG. 11 is a view showing a lid opening process. FIG. 12 is a figure which shows a production pipe insertion process. FIG. 13 is a perspective view of the fitting return tool.

  The oil production tool of the present embodiment includes an operation rod, an open claw, a oil production pipe operation rod, a vacuum container, a cap, an oil production pipe, a connection member, and a stopper. The operating rod includes a tip. An open claw is attached to the tip. The oil collection tube operating rod is movable in the axial direction of the operating rod. The vacuum vessel is attached to the tip of the oil pipe operation rod and includes a seal that seals the inside at the tip. The cap is inserted so that the vacuum vessel can be moved in the axial direction of the operating rod. The oil collection pipe protrudes inside the cap, includes a needle at the rear end facing the seal, and is fixed to the cap. The connecting member connects the vacuum vessel and the cap. The stopper is attached to the operating rod, and the oil collection pipe penetrates to face the cap.

  According to the oil producing tool of the present embodiment, the lid of the transformer can be opened by the open claws attached to the tip end portion and the tip end portion of the operation rod. Since the oil collection tube control rod is movable in the axial direction of the control rod, the oil collection tube control rod is on the tip end side of the control rod (that is, with the operator holding the control rod, that is, with the lid of the transformer open). Can be pushed towards the transformer). By this pressing operation, the vacuum container, the cap and the oil collecting pipe integrated with the oil collecting pipe operating rod also move toward the tip end. As a result, the oil production pipe advances from the tool tip and is inserted into the transformer. The stopper is attached to the operating rod held by the operator, and the cap abuts on the stopper when the oil collection pipe operating rod is pushed a predetermined distance in order to face the cap. Since the vacuum vessel is lightly pressed into the cap, after the cap strikes the stopper, the vacuum vessel further penetrates into the inside of the cap if the oil tube operating rod is further pressed down. Since the needle facing the seal of the vacuum container protrudes inside the cap, the needle penetrates the seal when it is pressed for a predetermined distance. Thus, since one end of the oil tube is in the vacuum vessel and the other end is in the insulating oil in the transformer, the pressure difference between the vacuum vessel and the outside air causes the insulating oil in the transformer to It flows in and insulating oil is collected. That is, according to the oil producing tool of the present embodiment, it is possible to adopt a so-called indirect active wire construction method, in which there is no need to blackout the surrounding facilities and the operator does not need to directly touch the charging unit of the facilities. Furthermore, the opening of the transformer lid and the oiling can be done with one tool. Thus, for example, when the transformer is attached to the utility pole, it is not necessary to remove the transformer from the utility pole in insulating oil harvesting. As a result, the time required for collecting insulating oil in the transformer can be significantly reduced, and the cost can be reduced. Furthermore, the safety is also improved because of the indirect active wire construction method.

  In the above-described oil producing tool, the stopper preferably includes an oil absorbing member through which the oil producing pipe passes.

  In the case of extraction of insulating oil, the oil pipe is withdrawn from the transformer as soon as a predetermined capacity is obtained. As described above, it is possible to suck up the oil droplets remaining inside the tube at the tip of the oil collection tube when it is separated from the insulating oil by pulling up the oil collection tube while there is a pressure difference between the vacuum container and the external pressure. In addition, since an oil production pipe passes to a stopper, if an oil absorption member is provided in a stopper, the drawn oil production pipe will pass an oil absorption member. As a result, since the oil absorbing member absorbs the insulating oil adhering to the periphery of the oil pipe at the tip end of the oil collection pipe, leakage of the insulating oil to the outside is suppressed.

  The oil production method of the present embodiment is a method for collecting insulating oil in a transformer using the above-described oil production tool. The oil production method includes a bolt loosening step, a lid opening step, a oil collection pipe insertion step, and an oil collection step. In the bolt loosening process, loosen the lock bolt of the transformer lid. In the lid opening process, the lock bolt loosens the lid of the transformer where the lock bolt is loosened at the tip of the operation rod of the oil production tool and the opening claw. In the oil pipe inserting step, the oil pipe operating rod is operated to insert the tip of the oil pipe into the inside of the transformer whose lid is opened. In the oil collecting process, the oil collecting pipe operating rod is operated, the cap is pressed against the stopper, the needle of the oil collecting pipe penetrates the seal of the vacuum vessel, and the insulating oil in the transformer is collected.

  Since the oil production method of this embodiment uses the above-mentioned oil production tool, it is not necessary to remove the transformer in insulation oil extraction, and the time for insulation oil extraction in the transformer can be shortened significantly and the cost can be reduced. Safety is high because it is an indirect hot-line construction method. In addition, the oil production method of this embodiment is applicable not only to the transformer disposed in the utility pole, but also to the case of producing oil from a transformer used in an electric room installed in an apartment house or a medium scale building It is.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings have the same reference characters allotted and description thereof will not be repeated.

[Oil production tool]
FIG. 1 is a side view of the oil producing tool. Referring to FIG. 1, the oil producing tool 1 includes an operating rod 2, an open claw 3, an oil producing pipe operating rod 4, a vacuum vessel 5, a cap 6, an oil producing pipe 7, a connecting member 8 and a stopper 9. And.

[Operation rod]
The operating rod 2 has a circular cross section and extends in the central axis direction. The material of the control rod 2 is a material with high electrical insulation. The operating rod 2 may be a solid rod or a hollow rod. A grip 10 is provided at one end (rear end) of the operating rod 2. The operator grips the grip to operate the control rod. The operating rod 2 includes a tip 11.

  FIG. 2 is an enlarged view of the vicinity of the tip of the operating rod. Referring to FIG. 2, the outer shape of tip portion 11 is a circle. The tip portion 11 includes a tip cylindrical portion 12 and a lock nut 14 in order from the tip side of the operation rod 2. The outer diameter of the tip cylindrical portion 12 is the largest in the tip portion 11. A pin 15 is inserted into the lock nut 14. The pin 15 is, for example, a screw. The tip 11 is attached to the tip of the operating rod 2 via a pin 15. In addition, in this embodiment, although the case where the operating rod 2 contains the separate front-end | tip part 11 is shown, a front-end | tip part may be integral with the operating rod.

[Opening claw]
The release claw 3 is attached to the tip 11. The release claw 3 extends in a direction (radial direction of the tip) perpendicular to the central axis of the operation rod 2. The end of the release claw 3 opposite to the end of the release claw 3 attached to the tip 11 is curved toward the tip of the operation rod 2. That is, the open claw 3 is hook-shaped.

  When the lid of the transformer is opened, the release claw 3 is hooked on the inside of the lid 32 of the transformer 31, and the tip cylindrical portion 12 of the tip portion 11 is put on the top surface of the lid 32 of the transformer. Thus, the contact between the tip cylindrical portion 12 and the upper surface of the lid 32 is the fulcrum, the contact between the open claw 3 and the inside of the lid is the action point, and the grip of the operating rod is the force point. Can be easily opened.

[Production tube control rod]
Referring to FIG. 1, the oil collection tube control rod 4 has a circular cross section and extends in the central axial direction. The material of the oil production pipe operating rod 4 is a highly insulating material. The oil collection tube control rod 4 may be a solid rod or a hollow rod. A grip 10 is provided at one end (rear end) of the oil collection pipe operating rod 4. The operator grips the grip and operates the oil collection tube control rod. The oil pipe operating rod 4 is connected to the operating rod 2 by a connecting device 17. The connecting device 17 is fixed to the operating rod 2 and movably holds the oil collection pipe operating rod 4 in the axial direction of the operating rod 2. Therefore, the operator can push the oil collection pipe operating rod 4 toward the front end side of the operating rod 2 or retract it toward the rear end side.

  FIG. 3 is a side view of the oil collection tool when the oil collection pipe operating rod is pushed to the tip side. Referring to FIG. 3, when the operator operates oil collecting pipe operating rod 4, oil collecting pipe operating rod 4 moves in the axial direction of operating rod 2. As will be described later, the oil tube 7 is inserted into the transformer to collect the insulating oil in the transformer.

[Vacuum container]
FIG. 4 is a perspective view of the vicinity of the vacuum vessel. Referring to FIG. 4, the vacuum vessel 5 is attached to the tip of the oil collection tube control rod 4. In addition, since the vacuum container 5 is accommodated in the inside of the holding member 38, it shows with a broken line in FIG. The vacuum vessel 5 can contain insulating oil. The shape of the vacuum vessel 5 is not particularly limited as long as it can contain a necessary amount of insulating oil. As the vacuum container 5, for example, a general-purpose sample collection tube, a test tube, or the like whose inside is a negative pressure with respect to the external pressure can be used.

  FIG. 5 is a cross-sectional view taken along the line V-V in FIG. Referring to FIG. 5, vacuum vessel 5 includes seal 18. The seal 18 is provided at the opening of the vacuum vessel 5. The seal 18 seals the inside of the vacuum vessel 5. The vacuum vessel 5 is attached to the oil collection pipe operating rod 4 with the seal 18 directed to the distal end side of the operating rod 2. Before containing the insulating oil, the inside of the vacuum vessel 5 is vacuum. As will be described later, the needle 19 penetrates the seal 18 by operating the oil collection pipe operating rod 4, and the insulating oil is collected in the vacuum container 5.

[cap]
The cap 6 has a cylindrical shape. A vacuum vessel 5 is inserted into the cap 6 so as to be movable in the axial direction of the operating rod 2. However, the vacuum vessel 5 is lightly pressed into the cap 6. Therefore, although the vacuum vessel 5 can enter into the cap 6, it does not enter beyond the predetermined position. The predetermined position is a position where the needle 19 penetrates the seal 18 of the vacuum vessel 5. The vacuum vessel 5 is lightly pressed into the cap in order to align the needle 19 so that the needle 19 can penetrate a predetermined position of the seal 18 of the vacuum vessel.

[Oil production pipe]
The oil collection pipe 7 is a hollow tube. The oil collection pipe is made of vinyl chloride, rubber or the like and can be elastically deformed. The oil collection pipe 7 is fixed to the cap 6 and moves integrally with the cap 6 by the operation of the oil collection pipe operation rod 4. The oil collection pipe 7 includes a needle 19. The needle 19 is provided at the rear end of the oil collection pipe. The needle 19 projects inside the cap 6. That is, the oil collection pipe 7 penetrates the cap 6. The needle 19 faces the seal 18 of the vacuum vessel. By operating the oil collection pipe operating rod 4, the needle 19 penetrates the seal 18, and the inside of the vacuum vessel and the inside of the oil collection pipe are spatially connected.

[Connection member]
Referring to FIG. 4, connecting member 8 connects vacuum vessel 5 and cap 6. As a result, by moving the oil collection pipe operating rod 4, the vacuum vessel 5 fixed to the oil collection pipe operating rod 4 moves integrally, and the cap 6 also moves integrally via the connecting member 8. Since the oil collection pipe 7 is fixed to the cap 6, the oil collection pipe 7 is advanced from the tip of the oil collection tool 1 by moving the oil collection pipe operating rod 4 in the axial direction of the operation rod 2. Thereby, the tip of the oil collection pipe can be inserted into the transformer. However, the connecting member 8 does not fix the positional relationship between the vacuum vessel 5 and the cap 6. The connecting member 8 allows the vacuum vessel 5 to enter into the cap 6. On the other hand, the connecting member 8 prevents the vacuum vessel 5 from coming out of the inside of the cap 6. For this reason, the cap 6 is provided with the flange portion 13, and the connecting member 8 includes the wall portion 16 that faces the flange portion 13 and can be in contact therewith.

  The connecting member 8 may connect the vacuum vessel 5 and the cap 6, and the shape and the material thereof are not particularly limited. For example, as shown in FIG. 4, the connecting member 8 is hinged at one end to the vacuum vessel 5 and provided with a wall 16 at the other end. The wall 16 is in the form of a snap ring to hold the cap 6. In this case, the connecting member 8 is a resin member. Besides, the connecting member 8 may be made of a wire or the like.

[Stopper]
FIG. 6 is a perspective view showing the stopper. In FIG. 6, the oil absorbing member 21 is not shown. Referring to FIG. 6, stopper 9 is a plate fixed to operating rod 2. The stopper is, for example, a steel plate or a plastic plate. The stopper comprises a hole 20. The oil collection pipe 7 penetrates the hole 20 of the stopper 9. Therefore, the diameter of the stopper hole 20 is larger than the diameter of the oil collection pipe 7. However, the diameter of the stopper hole 20 is smaller than the minimum outer diameter of the cap 6. The stopper 9 is opposed to the lid surface of the cap 6 (a surface of the two end surfaces in the axial direction of the cap 6 which is not opened) in the axial direction of the operating rod 2.

  In FIG. 6, the shape of the hole 20 is a circle. However, the shape of the hole 20 is not limited to this. The shape of the hole 20 may be a polygon, an ellipse or the like. Moreover, in FIG. 6, the stopper 9 shows the case where it is integral with the open claw 3. However, the stopper 9 may be a separate member from the opening claw 3.

  Referring to FIG. 5, when oil collecting pipe operating rod 4 is pushed along the axial direction of operating rod 2 to the tip side of operating rod 2, the lid surface of cap 6 abuts stopper 9. Therefore, the axial movement of the operating rod of the cap 6 is limited. However, as described above, the vacuum vessel 5 is lightly pressed into the cap 6 and can enter the inside of the cap to a predetermined position. After the cap 6 hits the stopper 9, when the oil tube operating rod 4 is further pushed forward along the axial direction of the operating rod 2, the vacuum vessel 5 further enters the inside of the cap 6. Since the needle 19 projects inside the cap 6, the needle 19 penetrates the seal 18 of the vacuum container. As a result, one end (the needle 19 side) of the oil production pipe 7 becomes vacuum and the other end is in the insulating oil in the transformer, so the insulation is caused by the pressure difference between the air pressure in the vacuum vessel 5 and the outside air. The oil flows into the vacuum vessel 5 and is collected.

  As described above, according to the oil producing tool of the present embodiment, it is possible to both open the lid of the transformer and collect the insulating oil in the transformer. Thus, for example, when the transformer is attached to the utility pole, it is not necessary to remove the transformer from the utility pole when extracting the insulating oil in the transformer. Therefore, the time required for insulating oil extraction in the transformer can be significantly reduced, and the cost can be reduced. Further, in the oil producing tool of the present embodiment, the operating rod and the oil producing pipe operating rod having high insulating properties are used. Therefore, there is no need to shut down the peripheral equipment, and there is no need for the operator to directly touch the charging part of the equipment. Therefore, the safety in the insulating oil sampling operation is also improved.

[Oil absorption member]
Referring to FIG. 4, the stopper may include oil absorbing member 21. The oil absorbing member 21 is, for example, a sponge.

  Referring to FIG. 5, the oil collecting pipe 7 penetrates the inside of the oil absorbing member 21. After collecting the insulating oil in the transformer, pull up the oil pipe from the inside of the transformer. Under the present circumstances, since the front-end | tip of the oil production pipe was immersed in insulating oil, there is a possibility that the insulating oil may drip from the front-end | tip of the oil production pipe. Since the sampled insulating oil may contain PCB, it is necessary to prevent the insulating oil from dripping and leaking to the outside. If the stopper 9 includes the oil absorbing member 21, the tip of the oil collection pipe pulled up from the transformer is immediately accommodated in the oil absorbing member 21. Therefore, it can suppress that insulating oil drips down from the tip of a oil collection pipe.

  In addition, even if the stopper does not contain the oil absorbing member, the insulating pipe can be isolated from the transformer by pulling up the oil collection pipe while the pressure difference between the vacuum container and the external pressure is obtained when the insulating oil of a predetermined volume is collected. It is possible to absorb oil droplets remaining at the tip of the oil collection tube as it leaves the oil. Furthermore, it is possible to prevent the dripping of the insulating oil by other measures such as carefully drawing up the oil pipe or providing a drip-proof sheet of the insulating oil.

[Oil production method]
Then, the oil production method of this embodiment is explained. The oil production method of this embodiment extracts insulating oil in a transformer using the above-described oil production tool. The oil production method includes a bolt loosening step, a lid opening step, a oil collection pipe insertion step, and an oil collection step. In addition, the oil production method of the present embodiment is a so-called indirect active wire construction method in which a power failure of peripheral equipment is not required, and an operator does not directly touch the charging unit of the equipment and performs work remotely.

[Bolt loosening process]
The transformer includes a container and a lid. The inside of the transformer is slightly underpressured to the outside air in order to improve the sealing. Therefore, the container and the lid of the transformer are firmly fixed by the lock bolt. In the bolt loosening process, loosen the lock bolt of the transformer lid. For example, the following tools can be used to loosen such a tightly tightened lock bolt.

  FIG. 7 is a side view of the lock bolt tightening and loosening tool attached to the operating rod. Referring to FIG. 7, the lock bolt tightening and loosening tool 22 is attached to the tip of the operating rod 27. The operating rod 27 is a general-purpose insulating operating rod.

  FIG. 8 is a side view of the lock bolt tightening and loosening tool. Referring to FIG. 8, the lock bolt tightening and loosening tool 22 includes an attaching portion 23, a ratchet shaft 24, a body 25, and a tip 26.

  The ratchet shaft portion 24 is attached to the attachment portion 23. FIG. 8 shows the case where the axial direction of the ratchet shaft portion is attached to be inclined with respect to the direction perpendicular to the axial direction of the operation rod 27. However, the ratchet shaft 24 may be attached in a direction perpendicular to the axial direction of the operating rod 27. The ratchet shaft portion 24 internally includes a ratchet mechanism. Therefore, the ratchet shaft 24 is rotatable in one direction around the axial direction of the ratchet shaft.

  The body 25 is fixed to the ratchet shaft 24. The body 25 extends in the radial direction of the ratchet shaft 24. Although the cross-sectional shape of the body 25 is not particularly limited, a ring (bolt head) 28 of a lock bolt passes through the body 25. Therefore, the cross-sectional shape of the body portion 25 is smaller than the inner peripheral ring of the ring 28. The lock bolt tightening and loosening tool may include a non-slip ring 29 fixed to the body 25. The non-slip ring 29 prevents the ring 28 of the lock bolt from shifting from the position of the body 25.

  FIG. 9 is a perspective view of the lock bolt tightening and loosening tool. Referring to FIG. 9, tip portion 26 is attached to body portion 25. The cross-sectional shape of the tip portion 26 is circular. The tip 26 is curved in the direction in which the body 25 extends. The cross-sectional area of the tip portion 26 decreases toward the end opposite to the end fixed to the body portion 25. In essence, the tip 26 is in the form of a tapered claw. The tip portion 26 has such a shape in order to slightly open the lid of the transformer as described later and release the negative pressure in the transformer.

  A method of loosening the transformer lock bolt using the lock bolt tightening and loosening tool 22 will be described.

  Referring to FIG. 9, the tip portion 26 of the lock bolt tightening and loosening tool attached to the operating rod is passed through the ring 28 of the lock bolt 30. Then, the body portion 25 is positioned in the ring 28. The operating rod 27 is operated to apply the body 25 to two places on the inner peripheral ring of the ring 28. From this state, the operating rod 27 is operated in the direction in which the ratchet shaft 24 does not rotate and in the direction in which the lock bolt 30 is loosened. Then, since the ratchet shaft portion 24 does not rotate with respect to the mounting portion 23 in this direction, the force applied to the operating rod 27 is transmitted to the ring 28 and the lock bolt 30 is loosened.

  Generally, if there is no ratchet function, when the operator operates the operating rod in the direction to loosen the lock bolt, the range in which the operating rod 27 can be operated is limited as long as the operator is in the same place. That is, as long as the worker is in the same place, only a predetermined amount can be rotated in the direction of loosening the lock bolt. However, the lock bolt tightening and loosening tool of the present embodiment includes the ratchet shaft portion 24, and the ratchet shaft portion 24 is rotatable in one direction (the direction in which the lock bolt is tightened). Therefore, even if the operating rod moved by the predetermined amount for loosening the lock bolt is returned to the original position (even if the lock bolt is tightened in the tightening direction), the tool body 25 and tip 26 rotate the lock bolt by a predetermined amount Stay in the same position. Then, by operating the operation rod 27 returned to the original position again, the lock bolt can be further rotated by a predetermined amount from the position rotated by a predetermined amount. By repeating this as shown by the arrow in FIG. 10, the lock bolt can be completely loosened even if the operator does not move around the lock bolt.

  The oil production method of the present embodiment may include a pressure adjustment step after the bolt loosening step and before the lid opening step. As described above, the inside of the transformer is under negative pressure with respect to the outside air. Therefore, in the pressure adjustment process, the lid of the transformer is slightly opened to make the pressure inside the transformer equal to the outside air.

  Also in this pressure adjustment process, the lock bolt tightening and loosening tool 22 described above can be used. After completely loosening all the lock bolts installed in the transformer, the tip of the tool is inserted between the lid 32 of the transformer 31 and the container 33. Then, by operating the control rod 27, the lid 32 of the transformer is slightly lifted to make the pressure in the transformer equal to the outside air. Due to the tapered claw shape of the tip 26, the tip can be easily inserted and lifted between the lid and the container.

  In the bolt loosening process of the present embodiment, the lock bolt may be loosened using a general-purpose tool other than the lock bolt tightening and loosening tool described above.

[Lid opening process]
FIG. 11 is a view showing a lid opening process. Referring to FIG. 11, in the lid opening step, the lid 32 of the transformer 31 in which the lock bolt is loosened is opened by the tip 11 and the opening claw 3 of the operating rod 2 of the oil producing tool 1. As described above, the tip cylindrical portion 12 of the tip portion 11 of the oil producing tool has the largest outside diameter of the tip portion 11. The tip cylindrical portion 12 is brought into contact with the upper surface of the lid 32, and the release claw 3 is inserted between the lid 32 and the container 33. Thereby, it is possible to easily open the lid of the transformer according to the principle of leverage.

[Oil tube insertion process]
FIG. 12 is a figure which shows a production pipe insertion process. Referring to FIG. 12, in the oil pipe inserting step, the oil pipe operating rod 4 is operated to insert the tip of the oil pipe 7 into the inside of the transformer 31 whose lid 32 is opened. As described above, the oil collection pipe operating rod 4 is movable in the axial direction of the operating rod 2. When the oil tube insertion step is performed, the above-described lid opening step is performed, and the transformer lid 32 is opened by the operation rod and the opening claw of the tool. In this state, when the oil collecting pipe operating rod 4 is pushed to the tip side along the axial direction of the operating rod 2, the oil collecting pipe 7 pops out from the tip of the oil collecting tool 1. Thus, the oil production pipe 7 is inserted into the transformer 31. In the oil pipe insertion step, the oil pipe operating rod 4 is pushed until the cap 6 of the oil tool touches the stopper 9.

[Oil collecting process]
Referring to FIG. 5, in the oil collecting step, after cap 6 hits stopper 9, oil collecting pipe operating rod 4 is further pushed in, and needle 19 of the oil collecting pipe penetrates seal 18 of the vacuum container. Thereby, the insulating oil in the transformer flows into the vacuum vessel and is collected due to the pressure difference between the inside of the vacuum vessel and the outside air. The collected insulating oil is analyzed and examined for the presence of PCB.

  After the insulating oil is collected, when the oil production pipe operating rod 4 is pulled back to the rear end side along the axial direction of the operating rod 2, the oil production pipe is withdrawn from the transformer 31. After withdrawing the oil production pipe, the operating rod 2 is operated to close the lid of the transformer which has been released. Then, the opposite operation to the above-mentioned bolt loosening process is performed, and the lock bolt is tightened. This completes the oil production operation.

  In addition, before tightening the lock bolt, it is necessary to return the lock bolt and the mounting bracket (washer) of the lock bolt to a predetermined position. At that time, for example, the following tools can be used.

  FIG. 13 is a perspective view of the fitting return tool. Referring to FIG. 13, the metal fitting return tool 34 includes an attachment portion 35, a magnet holding portion 36, and a magnet 37. The attachment portion 35 is attached to the tip of the operating rod 27. The magnet holding unit 36 holds the magnet 37. The magnet 37 is, for example, a permanent magnet. Since the lock bolt and the mounting bracket are magnetic metal, when the operating rod 27 is operated to bring the magnet 37 close to the lock bolt and the mounting bracket, the lock bolt and the mounting bracket are attached to the magnet. Therefore, if the metal fitting return tool 34 is used, the lock bolt and the mounting bracket can be easily returned to the predetermined position.

  The embodiment of the present invention has been described above. However, the embodiments described above are merely examples for implementing the present invention. Therefore, the present invention is not limited to the above-described embodiment, and the above-described embodiment can be appropriately modified and implemented without departing from the scope of the invention.

1: Oil production tool 2: Operation rod 3: Open claw 4: Oil production pipe operation rod 5: Vacuum vessel 6: Cap 7: Oil production pipe 8: Coupling member 9: Stopper 11: Tip part 18: Seal 19: Needle 21: Oil absorption Member 31: Transformer

Claims (3)

An operating rod including a tip,
An open claw attached to the tip;
An oil collection tube operating rod movable in the axial direction of the operating rod;
A vacuum vessel including a seal attached to the tip of the oil tube operation rod and sealing the inside at the tip;
A cap in which the vacuum vessel is movably inserted in the axial direction of the operating rod;
An oil-collecting pipe including a needle at a rear end, which protrudes inside the cap and is opposed to the seal and is fixed to the cap;
A connecting member for connecting the vacuum vessel and the cap;
An oil collection tool comprising: a stopper attached to the operating rod, through which the oil collection pipe penetrates and facing the cap. The oil production tool according to claim 1, wherein
The oil collection tool, wherein the stopper includes an oil absorbing member through which the oil collection pipe passes. A method of collecting insulating oil in a transformer using the oil production tool according to claim 1 or 2,
Loosening the lock bolt of the transformer lid;
Opening the lid of the transformer in which the lock bolt is loosened by the tip end of the operation rod of the oil producing tool and the open claw;
Operating the oil collecting pipe operating rod, and inserting the tip of the oil collecting pipe into the inside of the transformer with the lid opened;
Operating the oil collection pipe operating rod, pressing the cap against the stopper, penetrating the needle of the oil collection pipe through the seal of the vacuum vessel, and collecting the insulating oil in the transformer Method.

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