JPWO2018105090A1 - Attachment, operation tool, and method of pulling out a cylindrical cutout fuse cylinder - Google Patents

Abstract

In the case of a cylindrical cutout for extra high voltage distribution lines (used to protect the primary side of the transformer), the arc extinguishing capability of the slit arc extinguishing device consisting of arc extinguishing rod and arc extinguishing cylinder is insufficient The operation tool that pulls out the fuse cylinder from the cut-out body is provided by connecting the vacuum valve in parallel to the fuse cylinder, first opening the circuit on the fuse cylinder side, and then opening the vacuum valve. To do.

Description

  The present invention relates to an attachment for removing a fuse cylinder having a cylindrical cutout, an operation tool, and a method for pulling out a fuse cylinder having a cylindrical cutout.

  The transformer may be disconnected from the electrical circuit during inspection and maintenance on the high-voltage distribution line. At that time, the construction worker pulls out the fuse cylinder inserted into the main body of the cylindrical cutout connected to the primary side of the transformer as a protective device using an insulating operation rod or an insulating hot stick. (Japanese Unexamined Patent Publication No. 2014-99333). This operation was not particularly problematic for 6KV class high-voltage distribution lines.

  However, the cylindrical cutout for extra high voltage distribution lines used in 20KV class and 30 KV class extra high voltage distribution lines has the following problems.

  In other words, when disconnecting the transformer from the electrical circuit, as described above, if the fuse cylinder is removed from the cutout with the insulating operation rod, the upper electrode of the fuse cylinder is separated from the upper electrode of the cutout, and arc discharge occurs between the two electrodes. Happens. The generated arc is guided to a slit portion of a slit arc extinguishing device including an arc extinguishing bar and an arc extinguishing cylinder provided in the cutout. In the slit arc extinguishing device, arc extinguishing gas (decomposed gas) is generated by arc discharge, so that the arc disappears by the arc extinguishing gas and the disconnection of the electric circuit is completed.

  However, in the extra high voltage distribution line, the line voltage is high, so even if the generated arc is guided to the slit, the arc extinguishing gas (decomposition gas) generated from the arc extinguishing rod and the arc extinguishing cylinder may not disappear. is there. If the arc does not disappear, the inside of the main insulator may be contaminated by arc discharge. For this reason, in disconnecting the transformer from the electric circuit, there is a possibility that the arc cannot be extinguished or the electric circuit cannot be disconnected.

  As a countermeasure for this, the slit arc extinguishing device is configured to lengthen the slit portion formed by the arc extinguishing bar and the arc extinguishing cylinder, and the generated arc is guided into the slit portion to improve the arc extinguishing performance. It is also possible. However, in this case, an increase in the size of the slit arc extinguishing device is unavoidable, resulting in an increase in the size and weight of the entire cutout, which is not practical.

  Therefore, the present invention solves the problem of arc extinguishment and electric circuit disconnection that occur when the electric circuit is disconnected in the cylindrical cutout for the special high voltage distribution line used in the special high voltage distribution line, and the operator can safely operate it. It is an object of the present invention to provide an attachment, an operation tool, and a method of pulling out a cylindrical cutout fuse cylinder.

  According to one aspect of the present invention, the operating tool is inserted into the insulator of the cutout in the cylindrical cutout for the extra high voltage distribution line used for the purpose of protecting the primary side of the transformer of the extra high voltage distribution line. An operation tool for pulling out the attached fuse cylinder and disconnecting the transformer from the special high-voltage distribution line, mechanically and electrically connecting to the fuse cylinder and mechanically holding the fuse cylinder when connected And a large current interrupting part electrically connected in parallel with the fuse of the fuse cylinder, and when the fuse cylinder is pulled out, after the fuse is disconnected from the electric circuit, the interrupting part of the large current interrupting part is It consists of an outer body and an attachment characterized by opening an electric circuit.

  According to one aspect of the present invention, the operating tool is inserted into the insulator of the cutout in the cylindrical cutout for the extra high voltage distribution line used for the purpose of protecting the primary side of the transformer of the extra high voltage distribution line. An operation tool for pulling out the attached fuse cylinder and disconnecting the transformer from the special high-voltage distribution line, and electrically disconnecting the electric circuit by opening it and electrically connecting the electric circuit by closing it. A circuit generating means for generating a parallel circuit of the fuse cylinder and the vacuum valve, an opening means for opening the vacuum valve, a closing means for closing the opened vacuum valve, and the fuse cylinder being pulled out from the insulator When the fuse cylinder is disconnected from the lower electrode, the timing control means for controlling the opening means to open the vacuum valve closed by the closing means, Obtain.

  According to one aspect of the present invention, a method for extracting a cylindrical cutout fuse cylinder generates a parallel circuit in parallel with a fuse cylinder connected to an upper electrode and a lower electrode provided in an insulator of the cylindrical cutout. The circuit generating means is configured to open the circuit to electrically cut off the electric circuit of the parallel circuit, and to close the circuit to electrically connect the electric circuit of the parallel circuit by operating the circuit closing means, Electrically connecting an electric path of the parallel circuit; inserting an outer body into the insulator; generating the parallel circuit by the circuit generating means; and disconnecting the fuse cylinder from the lower electrode; After disconnecting the fuse cylinder from the upper electrode, controlling the opening means for opening the vacuum valve to open the vacuum valve closed by the closing means; and the vacuum After opening the lube, and a step of disconnecting the fuse tube from the upper electrode.

  According to one aspect of the present invention, the attachment has a drive body that is electrically connected to the frame and the cylindrical cutout fuse cylinder and moves in the axial direction at one end, and the drive body moves. A vacuum valve fixed to the frame for electrically blocking, a shaft body having one end fixed to the drive body, and a notch provided in a part in the circumferential direction, and the other end of the shaft body A disc-shaped seat plate fixed to the seat plate, a biasing means provided between the seat plate and the vacuum valve, and biasing the seat plate in a direction away from the vacuum valve; and A pressing member that presses the valve toward the valve in the axial direction and is positioned at the cutout portion to release the pressing, and a guide member that rotates the seat plate.

  According to an aspect of the present invention, the operating tool is configured to move the holding tool that holds the cylindrical cutout fuse cylinder, the frame to which the holding member is fixed, the fuse cylinder, and the axial movement. A vacuum valve fixed to the frame, a shaft body having one end fixed to the drive body, and a circumferential direction member. A disc-shaped seat plate fixed to the other end of the shaft body, provided between the seat plate and the vacuum valve, and separating the seat plate from the vacuum valve. A biasing means for biasing in the direction, pressing the seat plate in the axial direction toward the vacuum valve, and a pressing member for releasing the press by being positioned in the notch, and the seat plate Attach with rotating guide member Comprising cement and a shell body for movably accommodating the attachment in the axial direction, and a operating rod provided on the attachment.

  According to one aspect of the present invention, a plurality of operation tools are provided, and when connected, a connection fitting that engages in an axial direction with an engagement portion provided in a fuse cylinder of a cylindrical cutout, and a lower end of the fuse cylinder. An operating body that is operated by pressing and that contacts, a holding member that includes a moving body that opens and closes the connection fitting by operation of the operating body, and an operating rod connected to the holding member.

FIG. 1 is an explanatory diagram showing an outline of electric circuit disconnection of a cylindrical cutout using an operation tool according to an embodiment of the present invention. FIG. 2 is a perspective view showing the configuration of the operation tool. FIG. 3 is a perspective view showing the configuration of the operation tool and holding the fuse cylinder. FIG. 4 is a cross-sectional view showing the configuration of the operation tool. FIG. 5 is a cross-sectional view showing the configuration of the operation tool. FIG. 6 is a cross-sectional view showing the configuration of the cylindrical cutout. FIG. 7 is a perspective view showing a configuration of a fuse cylinder used for a cylindrical cutout. FIG. 8 is a front view illustrating a configuration of guide holes provided in the outer body of the operation tool. FIG. 9 is a cross-sectional view showing the main configuration of the operation tool. FIG. 10 is a cross-sectional view showing a main configuration of the operation tool. FIG. 11 is a cross-sectional view showing a main configuration of the operation tool. FIG. 12 is a perspective view showing a configuration of a seat plate used for attachment of the operation tool. FIG. 13 is a side view illustrating the configuration of the holding member of the operation tool. FIG. 14 is a side view showing the configuration of the holding member. FIG. 15 is an explanatory diagram showing the configuration and operation of the main part of the holding member. FIG. 16 is a perspective view showing the configuration of the moving member of the holding member. FIG. 17 is a flowchart showing an example of the replacement work of the fuse cylinder using the operation tool. FIG. 18 is a flowchart showing a schematic configuration of an example of the replacement work of the fuse cylinder using the operation tool. FIG. 19 is a flowchart showing a schematic configuration of an example of the work for replacing the fuse cylinder using the operation tool. FIG. 20 is a flowchart showing an example of the replacement work of the fuse cylinder using the operation tool in a circuit diagram. FIG. 21 is a flowchart showing an example of the operation of the attachment during the replacement operation of the fuse cylinder using the operation tool. FIG. 22 is a flowchart showing an example of the operation of the attachment during the replacement operation of the fuse cylinder using the operation tool. FIG. 23 is a flowchart showing the configuration of an example of the operation of the attachment at the time of exchanging the fuse cylinder using the operation tool.

Embodiment

  Hereinafter, the configuration of the operation tool 1 including the attachment 12 for removing the fuse cylinder 102 from the cutout body 101 of the cylindrical cutout 100 according to the embodiment of the present invention will be described.

  The operation tool 1 is used to remove the fuse cylinder 102 of the cylindrical cutout 100 provided in a 20 KV class or 30 KV class extra high voltage distribution line. The operation tool 1 generates a parallel circuit using the vacuum valve 52 and closes the vacuum valve 52 after removing the fuse cylinder 102 to prevent arc discharge.

  As shown in FIG. 1, the operation tool 1 includes a holding unit 3 that holds a fuse cylinder 102, a vacuum valve 52 that opens and closes an electric circuit, and a circuit and a vacuum valve 52 through a fuse cylinder 102 of a cylindrical cutout 100. After the circuit generating means 4 for generating a parallel circuit with the circuit via the circuit, the opening means 5 for opening the vacuum valve 52, the closing means 6 for closing the vacuum valve 52, and the fuse cylinder 102 are separated from the cutout body 101. Timing control means 7 for opening the vacuum valve 52. The holding unit 3, the circuit generating unit 4, and the vacuum valve 52 constitute a large current interrupting unit that is mechanically and electrically connected to the fuse cylinder 102. That is, the holding means 3 mechanically holds the fuse cylinder 102, and the circuit generation means 4 and the vacuum valve 52 are electrically connected in parallel with the fuse cylinder 102 held by the holding means 3.

  The operation tool 1 is separated from the cylindrical cutout 100 in a normal state as in the state 1 shown in FIG. 1. When the fuse cylinder 102 is removed, first, the opening means is opened by the closing means 6 as a preparation. The vacuum valve 52 is closed by operating the vacuum valve 52 against 5.

  Next, as shown in state 2 in FIG. 1, the operation tool 1 is connected to the cylindrical cutout 100, and the circuit generation unit 4 generates a parallel circuit of the fuse cylinder 102 and the vacuum valve 52. Next, by operating the operation tool 1 in the direction of pulling out the fuse cylinder 102, as shown in the state 2, the circuit on the fuse cylinder 102 side in the parallel circuit is opened.

  After the fuse cylinder 102 is disconnected from the circuit in the cylindrical cutout 100, the operating tool 1 is further operated in the same direction, so that the vacuum valve 52 is opened by the opening means 5 as shown in state 3, and the circuit Among the parallel circuits generated by the generating means 4, the circuit on the vacuum valve 52 side is opened. Thereby, a transformer (not shown) is completely disconnected from the electric circuit.

  After that, by operating the operation tool 1 in the direction in which the fuse cylinder 102 is extracted, the fuse cylinder 102 is extracted from the cutout main body 101. Through these steps, the fuse cylinder 102 is removed from the cutout body 101 without causing arc discharge from the cylindrical cutout 100.

  The timing control means 7 controls the opening timing of each circuit, such as the circuit on the fuse cylinder 102 side first and the circuit on the vacuum valve 52 side later. Details will be described later. As described above, the operating tool 1 can safely remove the fuse cylinder 102 from the cylindrical cutout 100.

Next, the detailed configuration of the operation tool 1 and the cylindrical cutout 100 using the operation tool 1 will be described below with reference to FIGS.
2 and 3 are perspective views showing the configuration of the operation tool 1, and FIGS. 4 and 5 are cross-sectional views showing the configuration of the operation tool 1 in the section of the cutting line different from the configuration of the operation tool 1. 6 is a cross-sectional view showing the configuration of the cylindrical cutout 100, and FIG. 7 is a perspective view showing the configuration of the fuse cylinder 102 used in the cylindrical cutout 100. As shown in FIG.

  8 is a front view showing the configuration of the guide hole 32 provided in the main body cover 21 of the outer body 11, and FIG. 9 is a cross-sectional view showing the configuration of the connection body 23 of the outer body 11 of the operation tool 1, FIG. 11 is a cross-sectional view illustrating configurations of the vacuum valve 52, the shaft body 53, the seat plate 54, the coil spring 55, and the pressing member 56 of the operation tool 1. FIG. 12 is a perspective view illustrating a configuration of a seat plate 54 used for the attachment 12 of the operation tool 1. FIG. 13 is a side view showing the configuration of the holding member 14 of the operating tool 1 and a plurality of connection fittings 74 being opened, and FIG. 14 is the configuration of the holding member 14 and the plurality of connection fittings 74 are It is a side view which shows the closed state. FIG. 15 is an explanatory diagram for explaining the position of the top dead center of the moving body 73 and the operation of the operating body 76 as a structure of the holding member 14. FIG. 16 is a perspective view showing the configuration of the moving body 73. For convenience of explanation, the configuration is appropriately omitted in each drawing.

  First, the cylindrical cutout 100 will be described.

  The cylindrical cutout 100 is used for a 20 KV class or 30 KV class extra high voltage distribution line. As shown in FIGS. 6 and 7, the cylindrical cutout 100 includes a cutout main body 101 and a fuse cylinder 102. The cylindrical cutout 100 is used for the purpose of protecting the primary side of the transformer provided in the extra high voltage distribution line. Cylindrical cutout 100 is connected to the primary side of the transformer. For example, a commercial power source and a load device are electrically connected. The cylindrical cutout 100 is a circuit breaker that interrupts an overcurrent exceeding the rated current.

  The cutout body 101 includes an insulator 111, a first electrode 112, a first electric wire 113, a second electrode 114, a second electric wire 115, a first insulating cover 116, and a second insulating cover 117. ing.

  The insulator 111 is formed in a cylindrical shape whose lower end opens the detachable fuse cylinder 102. Specifically, the insulator 111 includes a body 131 having a larger diameter than the outer diameter of the fuse cylinder 102, an opening 132 provided at the lower end of the body 131, and a skirt provided in the opening 132. 133, a first hole 134 provided at the upper end of the body 131, and a second hole 135 provided in a part of the outer peripheral surface of the opening 132.

  The opening 132 is configured so that the second electrode 114 can be fixed to the body 131 side of the internal space. The skirt 133 is fixed to the opening 132. The skirt 133 is configured to have a constant inner diameter at a portion fixed to the opening 132. The diameter of the skirt 133 is increased in a direction in which a portion located below the opening 132 is separated from the opening 132. The skirt 133 has an annular groove 133a formed on the inner peripheral surface along the circumferential direction. For example, the cross section of the groove 133a is rectangular or semicircular.

  The first hole 134 is configured with different inner diameters. The 1st hole part 134 is comprised so that the 1st electrode 112 can be fixed and the 1st electric wire 113 can be arrange | positioned. The 2nd hole 135 is comprised so that arrangement | positioning of the 2nd electric wire 115 is possible.

  The first electrode 112 is an upper electrode provided at the upper end of the insulator 111. The first electrode 112 is fixed to the first hole 134. The first electrode 112 holds the fuse cylinder 102. The first electrode 112 is in contact with the held fuse cylinder 102 and is electrically connected to the fuse cylinder 102. One end of the first electric wire 113 is electrically connected to the first electrode 112. The other end of the first electric wire 113 is connected to a commercial power source.

  The second electrode 114 is a lower electrode provided on the lower end side of the insulator. The second electrode 114 is fixed to the opening 132. The second electrode 114 is in contact with the outer peripheral surface on the lower end side of the fuse cylinder 102 and is electrically connected to the fuse cylinder 102. One end of the second electric wire 115 is electrically connected to the second electrode 114. The other end of the second electric wire 115 is connected to the load device.

  The first insulating cover 116 covers the first hole 134 of the insulator 111 and covers the first electric wire 113. The first insulating cover 116 insulates the end portions of the first electrode 112 and the first electric wire 113 provided in the first hole 134.

  The second insulating cover 117 covers the second hole 135 of the insulator 111 and covers the second electric wire 115. The second insulating cover 117 insulates the ends of the second electrode 114 and the second electric wire 115 provided in the second hole 135.

  The fuse cylinder 102 electrically connects the first electrode 112 connected to one end side and the second electrode 114 connected to the outer peripheral surface of the other end side. Specifically, the fuse cylinder 102 is provided at the upper end in a state of being fixed to the insulator 111, and is provided at the lower end with the upper electrode 141 held and connected to the first electrode 112, and is connected to the second electrode 114. A lower end electrode 142.

  Further, the fuse cylinder 102 cuts off the electrical connection between the upper end electrode 141 and the lower end electrode 142 when an overcurrent exceeding the rated current flows. That is, the fuse cylinder 102 is provided with a fuse for cutting off the electrical connection.

  The fuse cylinder 102 has an engaging portion 143 protruding in the circumferential direction on the outer peripheral surface of the lower end electrode 142. The engaging portion 143 is a protrusion configured in an annular shape. As for the engaging part 143, the outer periphery of the upper surface extends upwards. The fuse cylinder 102 is detached from the first electrode 112 when the engaging portion 143 is pulled downward from the opening portion 132 with a predetermined load. The fuse cylinder 102 is fixed to the first electrode 112 by being pressed upward from the opening 132 with a predetermined load.

  Next, the operation tool 1 will be described. As shown in FIGS. 2 to 5 and 8 to 14, the operation tool 1 includes an outer body 11, an attachment 12, a guide member 13, a holding member 14, an electrode member 15, an operation rod 16, It has. In the present embodiment, the operation tool 1 will be described below with the holding member 14 side as the upper side and the operation rod 16 side as the lower side.

  The outer body 11 includes a main body cover 21, an intermediate connection body 22, and a connection body 23. The outer body 11 has a cylindrical shape and accommodates the attachment 12 and the holding member 14 in a movable manner.

  The main body cover 21 is configured in a cylindrical shape having the same diameter. The body cover 21 is made of a nonconductive material. The main body cover 21 includes a pair of rails 31, a guide hole 32, a slit 33, and a regulating member 34 that regulates the movement of the attachment 12.

  The pair of rails 31 are provided along the axial direction of the main body cover 21 at symmetrical positions on the inner peripheral surface of the main body cover 21. The pair of rails 31 are fixed to the inner peripheral surface of the main body cover 21 by fastening members such as bolts, for example.

  The guide hole 32 is a hole provided on the lower end side of the center in the axial direction of the main body cover 21. As shown in FIG. 8, the guide hole 32 is provided continuously with the first portion 32 a extending in the axial direction of the main body cover 21 and the end portion of the first portion 32 a, and is inclined with respect to the axial direction of the main body cover 21. And a third portion 32c that is provided continuously with the end portion of the second portion 32b and extends in the axial direction of the main body cover 21.

  The first part 32a, the second part 32b, and the third part 32c constitute one hole. The first part 32 a and the third part 32 c are provided on the main body cover 21 so as to be separated from each other by a predetermined distance in the axial direction and the circumferential direction of the main body cover 21. The distance in the circumferential direction between the first portion 32a and the third portion 32c is appropriately set according to the rotation angle of a seat plate 54 described later of the attachment 12.

  In addition, the distance between the end portion of the first portion 32a and the end portion of the third portion 32c in the axial direction, in other words, the axial length of the guide hole 32 is the movement of the attachment 12 in the axial direction with respect to the outer body 11. The distance and the moving distance by which the seat plate 54 of the attachment 12 moves by the bias of a coil spring 55 described later are set as appropriate.

  Such a guide hole 32 constitutes the guide member 13. The guide hole 32 is configured such that a guide pin 57 (described later) fixed to the seat plate 54 of the attachment 12 can be disposed. The guide hole 32 is a guide for guiding the moving direction of the guide pin 57.

  The slit 33 is a hole extending in the axial direction from the lower end of the main body cover 21. The slit 33 is provided in a movable range of an operation lever 56 a used for a pressing member 56 described later of the attachment 12. The slit 33 is configured such that the operation lever 56a can be disposed.

  The restricting member 34 is provided in a part of the main body cover 21, and restricts the movement of the attachment 12 by contacting the attachment 12 moving in the axial direction. For example, the restricting member 34 is provided on the center side and the other end side of the main body cover 21, and is configured by a bolt partially protruding from the inner peripheral surface of the main body cover 21.

  The intermediate connection body 22 is configured in, for example, a cylindrical shape whose diameter is partially enlarged. The intermediate connection body 22 has an inner diameter in which the holding member 14 and the fuse cylinder 102 can be disposed. The intermediate connector 22 is fixed to one end of the main body cover 21, and the connector 23 is fixed to the other end.

  The connection body 23 is configured in a cylindrical shape. The outer diameter of the connecting body 23 is configured to be slightly smaller than the minimum inner diameter of the skirt 133 provided in the opening 132 of the insulator 111. The connection body 23 is configured such that a part of the radial thickness on the central side in the axial direction is thicker than the other part.

  As shown in FIG. 9, the connection body 23 includes a plurality of attachment portions 41, and a plurality of fitting pins 42 that are respectively provided on the plurality of attachment portions 41 and project from the outer peripheral surface of the connection body 23. . The plurality of attachment portions 41 and the plurality of fitting pins 42 are arranged on the connection body 23 at equal intervals in the circumferential direction.

  The mounting portion 41 is, for example, a cylindrical first mounting hole 41a provided along the radial direction in a portion where the radial thickness of the connection body 23 is configured, and a shaft continuous to the first mounting hole 41a. It is comprised by the column-shaped 2nd attachment hole 41b provided along the direction.

  The fitting pin 42 is configured to be able to fit into a groove 133 a provided on the inner peripheral surface of the skirt 133 of the insulator 111. The fitting pin 42 includes a pin 42a, a coil spring 42b that urges the pin 42a outward in the radial direction, and a restriction pin 42c that restricts the movement of the pin 42a.

  The pin 42 a has a tip shape that engages with the groove 133 a of the skirt 133. For example, the pin 42a has a truncated cone shape or a hemispherical shape. The pin 42a has an opening 42d whose rear end is opened in a cylindrical shape. In addition, the pin 42a has an opening 42e having a part of the outer peripheral surface that extends and opens in the axial direction of the pin 42a by the same distance as the movable distance of the pin 42a.

  The coil spring 42b is accommodated between the first mounting hole 41a and the pin 42a. One end of the coil spring 42b contacts the end surface of the first mounting hole 41a, and the other end contacts the end surface in the opening 42d at the rear end of the pin 42a. The coil spring 42b biases the pin 42a in a direction away from the first mounting hole 41a in the radial direction.

  The restriction pin 42c is fixed to the second mounting hole 41b. A part of the restriction pin 42c on the tip side is disposed in an opening 42e provided on the outer peripheral surface of the pin 42a. The regulation pin 42c regulates the movement of the pin 42a in the axial direction by coming into contact with the opening on the outer peripheral surface of the pin 42a.

  The attachment 12 includes a frame 51, a vacuum valve 52, a shaft 53, a seat plate 54, a coil spring 55 that is a biasing means, a pressing member 56, and a guide pin 57. The attachment 12 has a holding member 14 fixed to one end and an operation rod 16 fixed to the other end, and is accommodated in the outer body 11 so as to be movable along the axial direction. The attachment 12 constitutes the opening means 5 by the shaft body 53, the seat plate 54 and the coil spring 55, and the closing means 6 by the shaft body 53, the seat plate 54 and the pressing member 56. Further, the timing control means 7 is configured by the guide pin 57 of the attachment 12 and the guide hole 32 of the outer body 11.

  The frame 51 includes a first support plate 61, a second support plate 62, a third support plate 63, a fourth support plate 64, and a plurality of support columns that support the first support plate 61 to the fourth support plate 64. 65.

  As for the 1st support plate 61, the holding member 14 is fixed to one main surface, and the vacuum valve 52 is fixed to the other main surface. The 1st support plate 61 is comprised by square shape, for example. The diameter of the circumscribed circle of the first support plate 61 is configured to be the same as the inner diameter of the main body cover 21 or slightly smaller than the inner diameter of the main body cover 21. The first support plate 61 is made of a conductive material, for example, a metal material. The first support plate 61 has four corners fixed to the column 65.

  The second support plate 62 is formed in a disk shape having an opening 62a at the center. The outer diameter of the second support plate 62 is configured to be the same as the inner diameter of the main body cover 21 or slightly smaller than the inner diameter of the main body cover 21. The second support plate 62 is made of, for example, a nonconductive material, such as a resin material. The opening 62 a of the second support plate 62 is configured to have a larger diameter than the outer diameter of the shaft body 53. The outer peripheral surface of the second support plate 62 has a pair of guide grooves 62b in which the pair of rails 31 can be arranged.

  The second support plate 62 has a seat surface 62 c that supports the coil spring 55 on the main surface facing the third support plate 63. The outer peripheral edge of the second support plate 62 avoiding the guide groove 62 b is fixed to the column 65. The guide groove 62 b is configured in substantially the same shape as the cross-sectional shape orthogonal to the longitudinal direction of the pair of rails 31.

  The third support plate 63 is formed in a disc shape having an opening 63a at the center. The outer diameter of the third support plate 63 is configured to be the same as the outer diameter of the second support plate 62. The third support plate 63 is made of, for example, a conductive material, such as a resin material. The opening 63 a of the third support plate 63 is configured to have a larger diameter than the outer diameter of the shaft body 53. The third support plate 63 is provided on the outer peripheral surface of the opening 63a, and a pair of guide grooves 63b in which the pair of rails 31 can be arranged, and a pair of guide pins 63c, which will be described later, of the pressing member 56 are inserted. Through-holes 63c. The outer peripheral edge of the third support plate 63 avoiding the guide groove 63 b is fixed to the column 65. The third support plate 63 regulates the movement of the seat plate 54 when the seat plate 54 is urged by the coil spring 55 and the pressing pin 56c is positioned in the notch 54f of the seat plate 54. The movement of the second energizing shaft 52a is made to stop.

  The guide groove 63 b has the same shape as the guide groove 62 b of the second support plate 62, and is substantially the same shape as the cross-sectional shape orthogonal to the longitudinal direction of the pair of rails 31. The pair of through holes 63 c are provided at symmetrical positions with respect to the center of the third support plate 63.

  The fourth support plate 64 is formed in a disc shape having an opening 64a at the center, one main surface being a flat surface, and a cylindrical protrusion 64b at the center of the other main surface. The outer diameter of the fourth support plate 64 is configured to be the same as the outer diameter of the second support plate 62. The fourth support plate 64 is made of, for example, a metal material. The opening 64 a of the fourth support plate 64 is configured to be able to move a part of the pressing member 56.

  The protrusion 64b of the fourth support plate 64 is configured to be able to fix the operation rod 16. The outer peripheral surface of the fourth support plate 64 has a pair of guide grooves 64c in which the pair of rails 31 can be disposed, and a notch portion 64d in which an operation lever 56a provided between the pair of guide grooves 64c can be disposed. . The outer peripheral edge of the fourth support plate 64 that avoids the guide groove 64 c is fixed to the column 65.

  The guide groove 64 c is configured in the same shape as the guide groove 62 b of the second support plate 62 and substantially the same shape as the cross-sectional shape orthogonal to the longitudinal direction of the pair of rails 31. The notch 64d is a groove that is provided in the movable range of the operation lever 56a of the fourth support plate 64 and does not interfere with the operation lever 56a when the operation lever 56a is movable.

  The plurality of support columns 65 hold the first support plate 61, the second support plate 62, the third support plate 63, and the fourth support plate 64 with a predetermined interval therebetween. The support 65 is made of, for example, a nonconductive material.

  Such a frame 51 is supported by a plurality of columns 65 with the guide groove 62b of the second support plate 62, the guide groove 63b of the third support plate 63, and the guide groove 64c of the fourth support plate 64 facing each other. The plates 61, 62, 63 and 64 are fixed. Thereby, the frame 51 is accommodated in the main body cover 21 so as to be movable in the axial direction in the main body cover 21 by arranging the guide grooves 62b, 63b, 64c in the pair of rails 31. Further, for example, the frame 51 is configured such that the upper surface of the second support plate 62 and the lower surface of the fourth support plate 64 are connected to the restriction member 34 on one end side and the other end side provided on the main body cover 21. The movement along the axial direction is restricted.

  The vacuum valve 52 is electrically connected and fixed to the first support plate 61. The vacuum valve 52 has a first energizing shaft that is electrically connected to the first support plate 61. The vacuum valve 52 has a second energization shaft 52a that is movable in the axial direction and is electrically connected to the first energization shaft when closed. The vacuum valve 52 is a circuit breaker and is configured to be electrically connected and disconnected. In the vacuum valve 52, the second energizing shaft 52a is electrically connected to the first energizing shaft at the reference position, and the second energizing shaft 52a moves in a direction away from the vacuum valve 52 in the axial direction of the vacuum valve 52. Thus, the first energizing shaft and the second energizing shaft 52a are electrically disconnected.

  One end of the shaft body 53 is fixed to the second energizing shaft 52 a and the other end is fixed to the seat plate 54. The shaft 53 is screwed with a nut 53a at the tip, and is fixed to the seat plate 54 by the nut 53a.

  As shown in FIGS. 4, 5, and 10 to 12, the seat plate 54 is formed in a disk shape. The seat plate 54 fixes a seat surface 54a for supporting the coil spring 55 on one main surface, a boss 54b provided on the center side of the seat surface 54a, an opening 54c for fixing the shaft body 53, and a guide pin 57. And a pair of recesses 54e provided around the opening 54c, with which a part of the pressing member 56 abuts, and a pair of notches 54f into which the part of the pressing member 56 is inserted. .

  The boss 54 b is a cylindrical protrusion provided at the center of the seat plate 54. The boss 54b regulates the radial displacement of the coil spring 55 supported by the seat surface 54a. The outer diameter of the boss 54 b is configured to be smaller than the inner diameter of the coil spring 55. The opening 54 c passes through the center of the seat plate 54. The opening 54c is configured to be inserted and fixed through the shaft body 53. For example, the opening 54c fixes the shaft body 53 in one direction by a nut 53a screwed into the end of the shaft body 53 coming into contact with the lower surface side of the seat plate 54.

  A pair of fixing portions 54 d are provided at symmetrical positions on the outer peripheral surface of the seat plate 54. The fixing portion 54d is, for example, a female screw hole. A guide pin 57 is provided on one of the pair of fixing portions 54d.

  The recess 54e is a recess provided in the other main surface of the seat plate 54 and extending in the circumferential direction. The recess 54e contacts the tip of a pressing pin 56c described later of the pressing member 56.

  The notch 54 f is a notch provided in the seat plate 54. For example, the notches 54f are a pair of openings provided in the seat plate 54 and are arc-shaped openings extending in the circumferential direction. The notch 54f is provided continuously to the recess 54e. The notch 54f is configured such that the radial width of the seat plate 54 is such that the press pin 56c can be inserted when the press pin 56c that is in contact with the recess 54e is positioned by the rotation of the seat plate 54. .

  The distance between the centers of the pair of recesses 54 e and the distance between the centers of the pair of notches 54 f are set to be the same distance as the distance between the centers of the pair of through holes 63 c of the third support plate 63.

  The coil spring 55 is supported by the seat surface 62 c of the second support plate 62 and the seat surface 54 a of the seat plate 54, and biases the seat plate 54 in a direction away from the second support plate 62.

  The pressing member 56 includes an operation lever 56a, a drive shaft 56b, and a pressing pin 56c. The operation lever 56a is supported by the drive shaft 56b so as to be rotatable around a rotation shaft 56d orthogonal to the axial direction of the drive shaft 56b. The operation lever 56a contacts the fourth support plate 64 according to the rotational position, thereby moving the drive shaft 56b in the axial direction of the drive shaft 56b. In other words, the shape around the rotation shaft 56d of the operation lever 56a is longer at the position rotated from the radial rotation shaft 56d of the rotation shaft 56d to the outer peripheral edge at a predetermined rotation angle than the initial position. Configured in shape.

  The drive shaft 56 b has a pressing pin 56 c fixed at one end and the other end inserted into the opening 64 a of the fourth support plate 64. The outer diameter of the portion inserted into the opening 64a of the drive shaft 56b is configured to be the same as or slightly smaller than the inner diameter of the opening 64a so that the drive shaft 56b can move through the opening 64a.

  A pair of pressing pins 56c are provided. The tip shape of the pressing pin 56c is configured to be, for example, a hemisphere. The pair of pressing pins 56c are inserted into the pair of through holes 63c of the third support plate 63, respectively. The pressing pin 56 c is configured to be longer than the thickness of the third support plate 63. The distance between the centers of the pair of pressing pins 56 c is set to the same distance as the distance between the centers of the pair of through holes 63 c of the third support plate 63. The pressing pin 56c is fixed to the drive shaft 56b via, for example, a plate material 56e fixed to the end of the drive shaft 56b.

  The guide pin 57 is fixed to one of the fixing portions 54 d of the seat plate 54. On the outer peripheral surface of one end of the guide pin 57, a male screw that is screwed with the fixing portion 54d is formed. The guide pin 57 is fixed to the fixing portion 54 d and is set to a length that contacts the inner surface of the guide hole 32 of the main body cover 21 when the attachment 12 is accommodated in the main body cover 21.

  The guide member 13 guides the rotation of the seat plate 54 so that the pressing pin 56c is located in either the recess 54e or the notch 54f of the seat plate 54. Specifically, the guide member 13 is constituted by a guide hole 32 of the main body cover 21 and a guide pin 57 provided on the seat plate 54.

  The guide member 13 has a second portion 32b that is inclined in the axial direction of the guide hole 32 when the attachment 12 moves in the axial direction and the guide pin 57 moves from the first portion 32a of the guide hole 32 to the second portion 32b. The seat plate 54 is rotated by moving the guide pin 57 along the axis. By this rotation, when the pressing pin 56c located in the recess 54e of the seat plate 54 is located in the notch 54f, the seat plate 54 biased by the coil spring 55 moves in the axial direction. Thereby, the pressing pin 56c is inserted into the notch 54f. Thus, the guide member 13 converts the axial movement of the attachment 12 into the rotation of the seat plate 54, and guides the pressing pin 56c from the recess 54e to the notch 54f.

  As shown in FIGS. 2 to 5, 9, 13 to 16, the holding member 14 includes a pedestal 71, a base 72, a moving body 73, a plurality of connection fittings 74, and a biasing member 75. The operating body 76 and the operated body 77 are provided. When the operating body 76 is pressed, the holding member 14 opens and closes a plurality of connection fittings 74 connected to the fuse cylinder 102, and holds and releases the fuse cylinder 102. The holding member 14 electrically connects the fuse cylinder 102 and the vacuum valve 52 when the fuse cylinder 102 is held.

  The pedestal 71 is formed in a disk shape or a polygonal plate shape. The pedestal 71 is made of a conductive material such as a metal material. The pedestal 71 is fixed to the first support plate 61. The pedestal portion 71 fixes the base portion 72 and the plurality of connection fittings 74 and supports the biasing member 75.

  The base portion 72 is fixed to the upper surface of the pedestal portion 71. The base portion 72 includes a plurality of leg portions 72a and a cylindrical body portion 72b connected to the plurality of leg portions 72a. The plurality of leg portions 72a are respectively fixed to the first support plate 61 by fastening members such as bolts. The plurality of leg portions 72a are arranged at equal intervals at the lower end of the body portion 72b. The body 72b has an inner diameter that is smaller than the other inner diameter, and has an annular protrusion 72c that is configured to have substantially the same diameter as the outer diameter of the operation body 76 at the end. The trunk portion 72b guides the movement of the operating body 76 in the axial direction by the inner surface of the protrusion 72c and regulates the moving distance of the operating body 76.

  As shown in FIG. 16, the moving body 73 includes a disk-shaped seat surface portion 73 a and a plurality of operation portions 73 b that are provided integrally with the seat surface portion 73 a and control the movement of the plurality of connection fittings 74 in the radial direction. . The bottom surface of the seat surface portion 73 a constitutes the seat surface of the biasing member 75. The seat surface portion 73a has a hole 73c at the center.

  The operation portion 73b is, for example, a protrusion extending in the axial direction provided in the same number as the connection fitting 74 on the outer peripheral edge of the seat surface portion 73a. For example, four operation units 73b are provided. The operation portion 73 b presses the connection fitting 74 in the radial direction of the base portion 72 by having the tip contact with the connection fitting 74. For example, the tip surface and the ridge portion of the outer surface of the operation unit 73b are configured as an inclined surface or a curved surface. Moreover, the operation part 73b has the control part 73d in the outer surface.

  The restricting portion 73d includes a protruding portion 73f formed with a hole 73e that protrudes in the radial direction and opens in a direction orthogonal to the axial direction, and a pin 73g fitted in the hole 73e. The length of the pin 73g is configured to be longer than the width of the protrusion 73f. In other words, both ends of the pin 73g fitted in the hole 73e protrude from both end surfaces of the protrusion 73f.

  The plurality of connection fittings 74 are fixed to the outer surface of the pedestal portion 71 at equal intervals. The connection fitting 74 is configured in a plate shape that is long in one direction. One end of the connection fitting 74 is fixed to the pedestal 71 by a fastening member such as a bolt. The connection fitting 74 has a first return portion 74a provided at the other end, an opening portion 74b provided at the intermediate portion, and a second return portion 74c provided at the upper end of the opening portion 74b.

  The first return portion 74 a protrudes from the upper end of the connection fitting 74 toward the pedestal portion 71 in a state where the connection fitting 74 is fixed to the pedestal portion 71. In other words, the first return portion 74a is fixed to the pedestal portion 71, protrudes from the upper end of the connection fitting 74 toward the central axis of the trunk portion 72b of the base 72, and protrudes downward. . The first return portion 74 a is inclined with respect to the axis of the main body cover 21.

  The opening 74b is configured to have a width wider than the width of the protruding portion 73f of the restricting portion 73d provided in the operation portion 73b of the moving body 73. Further, the opening 74b is disposed below the first opening 74d and the first opening 74d configured to be wider than the width of the pin 73g provided in the protrusion 73f, and is narrower than the width of the pin 73g. The second opening 74e is configured.

  The second return portion 74 c protrudes toward the upper end side of the connection fitting 74 from a portion located at the upper end of the opening 74 b in a state where the connection fitting 74 is fixed to the pedestal portion 71. In other words, the second return portion 74c protrudes upward in the direction from the upper end of the first opening 74d of the opening 74b toward the central axis of the trunk portion 72b. The second return portion 74 c is inclined with respect to the axis of the main body cover 21. The second return portion 74 c comes into contact with the tip of the operation portion 73 b of the moving body 73.

  The biasing member 75 is, for example, a coil spring. The urging member 75 contacts the main surface of the pedestal 71 and the seat surface 73 a of the moving body 73. The urging member 75 urges the moving body 73 in a direction away from the pedestal portion 71.

  The operation body 76 is configured in a cylindrical shape whose upper end is closed. The operation body 76 is configured such that the outer diameter on the upper end side is smaller than the outer diameter on the lower end side. The outer diameter on the upper end side of the operating body 76 is configured to be the same diameter as the inner diameter of the protrusion 72 c of the body 72 b of the base 72 or slightly smaller than the inner diameter. The outer diameter of the lower end side of the operation body 76 is configured to be larger than the inner diameter of the protrusion 72c of the trunk portion 72b and smaller than the inner diameter of the other portion of the trunk portion 72b.

  That is, the operating body 76 has a large diameter portion 76a provided on the lower end side and a small diameter portion 76b provided on the upper end side. In the operating body 76, the end surface formed at the boundary between the large diameter portion 76a and the small diameter portion 76b abuts on the protrusion 72c of the body 72b, whereby the movement in the axial direction is restricted by the protrusion 72c.

  The operated body 77 is configured in a double cylindrical shape whose one end is closed. The operated body 77 has an outer cylinder part 77a and an inner cylinder part 77b.

  The outer cylinder part 77a has a plurality of protrusions 77c on the outer peripheral surface thereof that abut against the lower end of the large diameter part 76a of the operating body 76. The outer diameter of the outer cylindrical portion 77a is the same as or slightly smaller than the inner diameter of the large diameter portion 76a of the operating body 76, and larger than the inner diameter of the small diameter portion 76b of the operating body 76. Is done. The outer cylinder part 77 a is inserted into the large diameter part 76 a of the operating body 76. The inner cylinder part 77b protrudes from the lower end of the outer cylinder part 77a. The outer diameter of the inner cylinder portion 77b is configured to be the same as or slightly smaller than the inner diameter of the hole 73c of the seat surface portion 73a. The inner cylinder portion 77b is inserted into the hole portion 73c of the seat surface portion 73a.

  In addition, the holding member 14 rotates the operated body 77 relative to the body 72 b of the base 72 every time the operating body 76 is operated, so that the moving distance in the axial direction of the moving body 73 relative to the base 72 is variable. 78. In other words, as shown in FIGS. 13 to 15, the variable mechanism 78 changes the top dead center of the moving body 73 to the first top dead center for each operation from the top dead center to the bottom dead center of the operating body 76. It can be switched to a second top dead center located lower than the first top dead center.

  The first top dead center is a position where the tip of the operation portion 73b of the moving body 73 contacts the second return portion 74c, and the pin 73g of the operation portion 73b is set to a position where it is disposed in the first opening 74d. Is done. The second top dead center is set to a position where the tip of the operation portion 73b of the moving body 73 is separated from the second return portion 74c and the pin 73g is disposed in the second opening 74e.

  As a specific example, the variable mechanism 78 includes a plurality of inclined surfaces that come into contact with the upper surface of the protrusion 77 c of the operated body 77 and the upper surface of the protrusion 77 c provided on the lower end surface of the large-diameter portion 76 a of the operation body 76. A plurality of protrusions 72d that are provided on the inner peripheral surface of the recess 76c and the body 72b of the base 72, have different axial lengths alternately, and constitute grooves in which the protrusions 77c are arranged, and whose lower ends are inclined. And composed of

  The variable mechanism 78 engages the recess 76c at the lower end of the operating body 76 with the protrusion 77c by the movement of the operating body 76 to rotate the operated body 77 by a predetermined angle, and the protrusion 77c is moved to the body 72b. The grooves are alternately arranged in grooves having different lengths from the lower end of the inner peripheral surface. The variable mechanism 78 varies the moving distance in the axial direction of the moving body 73 that contacts the lower end of the operated body 77 by changing the moving distance in the axial direction of the operated body 77.

  Further, the variable mechanism 78 determines the variable distance of the moving distance in the axial direction of the operated body 77, in other words, the distance between the first top dead center and the second top dead center of the moving body 73. The distance between the position where the pin 73g of the part 73b is located between the first opening 74d and the second opening 74e, and the position where the tip of the operation part 73b interferes with the second return part 74c and the position where it does not interfere Set to

  The electrode member 15 includes a first electrode member 81 that electrically connects the lower end electrode 142 of the fuse cylinder 102 and the upper end of the vacuum valve 52, the second electrode 114 of the cutout body 101, and the lower end of the vacuum valve 52, in other words, a vacuum. And a second electrode member 82 that electrically connects the second energizing shaft 52a of the valve 52. The electrode member 15 is circuit generation means 4 that generates a parallel circuit when the outer body 11 is fixed to the cutout body 101. The parallel circuit is configured by an electric circuit on the fuse cylinder 102 side and an electric circuit on the vacuum valve 52 side provided between the first electrode 112 and the second electrode 114 of the cutout body 101. Specifically, the parallel circuit includes a circuit on the fuse cylinder 102 side passing through the first electrode 112, the fuse cylinder 102, and the second electrode 114 of the cutout body 101, the first electrode 112, the fuse cylinder 102, and the first electrode member. 81, a vacuum valve 52, a second electrode member 82, and a circuit on the vacuum valve 52 side passing through the second electrode 114.

  The first electrode member 81 includes a first support plate 61, a pedestal portion 71 and a connection fitting 74. The first electrode member 81 includes a connection fitting 74 engaged with an engagement portion of the lower end electrode 142 of the fuse cylinder 102, a pedestal portion 71 to which the connection fitting 74 is fixed, and a first support plate to which the pedestal portion 71 is fixed. 61, the upper end of the vacuum valve 52 fixed to the first support plate 61 is electrically connected from the lower end electrode 142. In other words, the first electrode member 81 is evacuated from the fuse cylinder 102 by the contact of the fuse cylinder 102 and the connection fitting 74, the contact of the connection fitting 74 and the pedestal 71, the contact of the first support plate 61 and the first current-carrying shaft. An electric circuit to the valve 52 is configured. Note that the holding means 3 is configured by the contacts of the first support plate 61 and the first current-carrying shaft and the contacts of the holding member 14, the fuse cylinder 102 and the connection fitting 74.

  The second electrode member 82 includes a wiring 82a made of a conductive material and a strip-shaped energization plate 82b. One end of the wiring 82a is connected to the second energizing shaft 52a of the vacuum valve 52 or the shaft body 53 fixed to the second energizing shaft 52a. The other end of the wiring 82 a is disposed in the slit 33 of the main body cover 21. The energization plate 82 b is provided along the axial direction on the outer surfaces of the main body cover 21, the intermediate connection body 22, and the connection body 23, and is provided annularly along the circumferential direction on the outer peripheral surface of the connection body 23 in the connection body 23.

  One end of the energization plate 82 b is disposed in the slit 33 and is electrically connected to the wiring 82 a provided in the slit 33. At the other end of the current-carrying plate 82b that is annularly provided along the circumferential direction in the connection body 23, the fitting pin 42 of the connection body 23 is fitted into the groove 133a provided on the inner peripheral surface of the skirt 133 of the insulator 111. Sometimes it is electrically connected to the second electrode 114.

  The operation rod 16 is set to a length that allows the connection body 23 to be inserted into the skirt 133 of the insulator 111 from the ground, for example, about 10 m. The operation rod 16 is made of an insulating material. One end of the operation rod 16 is fixed to a protruding portion 64 b provided on the fourth support plate 64.

  Next, with respect to the replacement work of the fuse cylinder 102 of the cylindrical cutout 100 installed at a high place such as a utility pole using the operation tool 1 configured as described above, a flowchart shown in FIG. 19 is a flowchart showing the schematic configuration of the operation tool 1 and the fuse cylinder 102, FIG. 20 is a flowchart showing the schematic diagram, and FIGS. 21 to 23 are flowcharts showing the schematic configuration of the attachment 12. FIGS. 21 to 23 show the operation of the seat plate 54 in the axial direction and the circumferential direction and the operation of the pressing pin 56c in (a), and the operation in the circumferential direction of the seat plate 54 and the notch 54f and The relationship of the pressing pin 56c is shown, and the operation of the guide pin 57 in the guide hole 32 is shown using arrows as appropriate in (c).

  First, preparation is made to remove the fuse cylinder 102 of the cylindrical cutout 100 with the operation tool 1 (step ST1). Specifically, as preparation of the operation tool 1, the operator presses the operation body 76 of the holding member 14 and arranges the moving body 73 at the first top dead center. By disposing the moving body 73 at the first top dead center, the distal end of the operation portion 73b of the moving body 73 presses the second return portion 74c of the connection fitting 74, and the pin 73g of the operation portion 73b opens the first opening. 74d.

  As a result, the connection fitting 74 spreads outward as shown in FIG. 13, and the plurality of connection fittings 74 are opened. That is, the diameter of the inscribed circle between the tips of the first return portions 74 a of the plurality of connection fittings 74, in other words, passes through the tips of the plurality of first return portions 74 a is larger than the outer diameter of the engaging portion 143 of the fuse cylinder 102. Also grows.

  Further, in the operation tool 1 before use, that is, in the initial state, as shown in step ST11 of FIG. 21, the pressing pin 56c is positioned in the notch 54f, and the seat plate 54 is in contact with the third support plate 63. The guide pin 57 is located at the lower end of the second portion 32b of the guide hole 32 or the third portion 32c.

  Therefore, the operator operates the operation lever 56a to retract the pressing pin 56c from the notch 54f as shown in step ST12 of FIG. 21, and then operates the guide pin 57 as shown in step ST13. Then, the guide pin 57 in the second part 32b or the third part 32c of the guide hole 32 is moved toward the first part 32a. Next, as shown in step ST14 of FIG. 22, the operation lever 56a is operated to move the pressing pin 56c toward the seat plate 54 in the axial direction. Thereby, as shown in step ST15 of FIG. 22, the guide pin 57 is positioned on the first portion 32a, the concave portion 54e of the seat plate 54 and the pressing pin 56c face each other, and the pressing pin 56c presses the concave portion 54e. When the pressing pin 56c presses the recess 54e, the seat plate 54 moves to the vacuum valve 52 side and compresses the coil spring 55.

  In addition, the guide pin 57 is positioned on the first portion 32a, thereby coming into contact with the inner surface of the guide hole 32 constituting the first portion 32a and restricting the seat plate 54 from rotating. Thereby, the coil spring 55 is compressed and accumulated, and the seat plate 54 is urged in the direction away from the vacuum valve 52, and the movement in the direction away from the vacuum valve 52 is restricted.

  Through these steps, the preparation of the operation tool 1 is completed. At this time, as shown in ST1 of FIG. 20, the cylindrical cutout 100 is electrically connected to the first electrode 112 and the second electrode 114 via the fuse cylinder 102. In addition, the operating tool 1 is connected to the first electrode member 81 and the second electrode member 82 through the vacuum valve 52 so that energization is possible.

  Next, the operator holds the operation rod 16 and moves the operation tool 1 upward. The operator aligns the connection body 23 with the skirt 133 of the insulator 111, further moves the operation tool 1 upward, and pushes the connection body 23 into the skirt 133 (step ST2).

  In the connection body 23 inserted into the skirt 133, the pin 42a of the fitting pin 42 of the connection body 23 abuts against the inner surface of the skirt 133, and the pin 42a is placed in the first mounting hole 41a against the bias of the coil spring 42b. Moving. When the connecting body 23 is further pushed, the pin 42a is positioned in the groove 133a of the skirt 133, the compressed coil spring 42b is restored, and the pin 42a moves outward.

  Accordingly, the plurality of fitting pins 42 are fitted into the grooves 133 a of the skirt 133, and the outer body 11 is fixed to the insulator 111. Further, the end portion of the second electrode member 82 provided on the outer surface of the connection body 23 is connected to the second electrode 114.

  When the connection body 23 is pushed into the skirt 133, the tip of the lower end electrode 142 of the fuse cylinder 102 presses the operation body 76 of the holding member 14. When the operating body 76 is pushed in by this pressing, the operated body 77 rotates and the top dead center of the moving body 73 is switched to the second top dead center.

  As a result, as shown in FIG. 14, the tip of the connection fitting 74 moves inward, the plurality of connection fittings 74 are closed, and the lower end electrode 142 of the fuse cylinder 102 and the connection fitting 74 are electrically connected. As a result, as shown in ST2 of FIG. 20, in the cylindrical cutout 100, the first electrode 112 and the second electrode 114 are energized through the fuse cylinder 102, and the first electrode 112, the first electrode member 81, and the vacuum are supplied. The second electrode 114 is energized through the valve 52 and the second electrode member 82.

  In other words, when the connection fitting 74 comes into contact with the lower end electrode 142 of the fuse cylinder 102, the first electrode 112 and the second electrode via the first electrode member 81, the vacuum valve 52 and the second electrode member 82 of the operation tool 1. 114 is energized to form a parallel circuit.

  Next, after the fitting pin 42 is fitted into the groove 133a of the skirt 133, the operator releases the pushing of the operation rod 16 (step ST3). When the push-in of the operation rod 16 is released, the attachment 12 and the operation rod 16 move downward while the outer body 11 is fixed to the insulator 111, and the first return portion 74a of the connection fitting 74 engages with the fuse cylinder 102. Engage with part 143. At this time, as shown in ST3 of FIG. 20, as in ST2, in the cylindrical cutout 100, the first electrode 112 and the second electrode 114 are energized through the fuse cylinder 102, and from the first electrode 112, The state where the second electrode 114 is energized through the first electrode member 81, the vacuum valve 52 and the second electrode member 82 is maintained.

  Next, the operator pulls the operation rod 16 downward. By pulling the operating rod 16 downward, first, the fuse cylinder 102 is opened (step ST4). Specifically, the attachment 12 moves downward along the pair of rails 31, and the guide pin 57 moves in the first portion 32 a of the guide hole 32. While the guide pin 57 moves from the upper side to the lower side of the first portion 32a of the guide hole 32, the fuse cylinder 102 engaged with the connection fitting 74 moves downward, and the lower end electrode 142 of the fuse cylinder 102 is the second electrode 142. Separate from the electrode 114. Note that the upper end electrode 141 of the fuse cylinder 102 is kept connected to the first electrode 112.

  As a result, as shown in ST4 of FIG. 20, in the cylindrical cutout 100, the electrical connection between the first electrode 112 and the second electrode 114 via the fuse cylinder 102 is disconnected, and the first electrode 112 is connected to the fuse. The second electrode 114 is energized through the cylinder 102, the first electrode member 81, the vacuum valve 52, and the second electrode member 82. At this time, as shown in step ST16 of FIG. 22, the guide pin 57 moves in the first portion 32a, but is located in the first portion 32a and the state where the pressing pin 56c presses the recess 54e is maintained.

  After the lower end electrode 142 of the fuse cylinder 102 is separated from the second electrode 114, the operating rod 16 is further pulled downward, whereby the vacuum valve 52 is opened (step ST5). Specifically, the attachment 12 further moves downward along the pair of rails 31 from step ST4. As the attachment 12 moves, the guide pin 57 further moves through the first portion 32a of the guide hole 32 as shown in step ST17 of FIG. 23, and as shown in step ST18 of FIG. The guide hole 32 moves from the first part 32a to the second part 32b. Since the second part 32b extends in a direction inclined with respect to the longitudinal direction of the first part 32a, the guide pin 57 is guided by the second part 32b and moves in the circumferential direction in addition to the axial direction, and the seat plate 54 rotates. When the seat plate 54 rotates by a predetermined angle, the pressing pin 56c moves from the recess 54e to the notch 54f.

  When the pressing pin 56c moves to the notch portion 54f, the seat plate 54 biased by the coil spring 55 moves downward separately from the movement of the attachment 12. As the seat plate 54 moves downward, the shaft 53 fixed to the seat plate 54 also moves downward, and the second energizing shaft 52a of the vacuum valve 52 moves downward. The vacuum valve 52 is electrically disconnected by the movement of the second energizing shaft 52a. When the seat plate 54 contacts the third support plate 63, the guide pin 57 is positioned at the lower end of the second portion 32b or the third portion 32c, as shown in step ST19 of FIG.

  By these steps, after the fuse cylinder 102 is electrically disconnected from the second electrode 114, the vacuum valve 52 opens the electric circuit on the side of the vacuum valve 52 of the parallel circuit, and as shown in ST5 of FIG. The electrode 112 is electrically disconnected from the second electrode 114.

  By further pulling the operating rod 16 downward from the state of step ST5, the fuse cylinder 102 is pulled out from the first electrode 112 while being held by the holding member 14 (step ST6). Next, by pulling the operating rod 16 downward, the pin 42a of the fitting pin 42 is pressed against the inner surface of the groove 133a to press the coil spring 42b. Thereby, the pin 42a moves radially inward, the fitting pin 42 is removed from the groove 133a, and the operation tool 1 is pulled out from the lever 111. Through these steps, the fuse cylinder 102 is removed from the insulator 111 by the operation tool 1.

  When removing the fuse cylinder 102 from the holding member 14, the top dead center of the moving body 73 is changed from the second top dead center to the first dead center by pressing the fuse cylinder 102 toward the operating body 76 of the holding member 14. Switching to the top dead center and the connection fitting 74 is opened, whereby the fuse cylinder 102 can be removed.

  Further, when the fuse cylinder 102 is attached to the insulator 111, the operating tool 1 is operated with the new fuse cylinder 102 held by the holding member 14, and the connecting body 23 is pushed into the skirt 133 of the insulator 111. The upper end electrode 141 of the fuse cylinder 102 is held by the first electrode 112, and then the lower end electrode 142 is connected to the second electrode 114. Further, when the fuse cylinder 102 is pushed into the first electrode 112 until it reaches the bottom, the operating body 76 is pushed by the lower end of the lower end electrode 142 of the fuse cylinder 102, and the top dead center of the moving body 73 becomes the second top dead center. Switch. As a result, the fuse cylinder 102 is detached from the holding member 14. For this reason, even if the operating tool 1 is pulled out from the insulator 111, the fuse cylinder 102 can be attached to the insulator 111 because the fuse cylinder 102 is held by the first electrode 112.

  According to the operation tool 1 including the attachment 12 configured as described above, the fuse cylinder 102 can be attached to and removed from the insulator 111 only by operating the operation tool 1 in one axial direction with respect to the insulator 111. Good. For this reason, the operation tool 1 can easily attach and detach the fuse cylinder 102.

  In particular, the cylindrical cutout 100 is often installed at a high place, and when the distance from the handle portion of the operation rod 16 gripped by the operator to the holding member 14, that is, the ground 111 to the operation tool 1 is increased. It becomes difficult to apply a force to the tip of the head in an oblique direction or a rotational direction. However, the present invention has good operability because the fuse cylinder 102 can be attached and detached by operating in one direction.

  In addition to the circuit that electrically connects the first electrode 112 of the cylindrical cutout 100 to the second electrode 114 via the fuse cylinder 102, the operation tool 1 is also connected to the first electrode member 81, vacuum from the fuse cylinder 102. A circuit that is electrically connected to the second electrode 114 via the valve 52 and the second electrode member 82 is configured. That is, the operation tool 1 is mechanically connected to the cylindrical cutout 100 to form a parallel circuit between the first electrode 112 and the second electrode 114 of the cutout body 101. When the operation tool 1 is operated and the fuse cylinder 102 is pulled out, first, a circuit including the first electrode 112, the fuse cylinder 102, and the second electrode 114 in the parallel circuit is electrically cut off. Thereafter, by further operating the operation tool 1, the vacuum valve 52 is opened, and the circuit on the vacuum valve 52 side in the parallel circuit is electrically cut off.

  As described above, the operation tool 1 previously cuts off the flow of electrically connecting the first electrode 112 and the second electrode 114 directly by the fuse cylinder 102, and the first electrode 112 and the second electrode via the vacuum valve 52. 114 connections are maintained. Thereby, the operation tool 1 can prevent arc discharge between the lower end electrode 142 and the second electrode 114 from occurring when the lower end electrode 142 of the fuse cylinder 102 is separated from the second electrode 114. For this reason, the operation tool 1 can safely pull out the fuse cylinder 102 from the cylindrical cutout 100 provided on the primary side of the transformer of the extra high voltage distribution line.

  Further, when the fuse cylinder 102 is pulled out while a high voltage current is flowing through the cylindrical cutout 100, arc discharge can be prevented from occurring in the insulator 111 without requiring an extinguishing cylinder. Of course, the operation tool 1 can also be used for mounting the fuse cylinder 102 of the cylindrical cutout 100 having an arc extinguishing cylinder.

  In addition, the operating tool 1 includes a variable mechanism 78 that opens and closes a plurality of connection fittings 74 by operating the operating body 76 as the holding member 14 that holds the fuse cylinder 102. For this reason, the holding member 14 can reliably hold the fuse cylinder 102.

  As described above, according to the operation tool 1 according to the embodiment of the present invention, the fuse cylinder 102 of the cylindrical cutout 100 can be easily and safely removed.

  In addition, this invention is not limited to embodiment mentioned above. For example, in the above-described example, the holding member 14 that opens and closes the connection fitting 74 with the variable mechanism 78 has been described. However, the present invention is not limited to this, and the connection fitting 74 may be opened and closed with another mechanism.

  In the above-described example, the configuration in which the pressing pin 56c is moved upward by the operation lever 56a and the seat plate 54 is pressed has been described. However, the present invention is not limited thereto, and the pressing pin 56c is moved upward by other means. It may be a configuration. In the above-described example, the configuration in which the coil spring 55 is used as the urging unit that urges the seat plate 54 in one direction has been described. The urging means may be a leaf spring or the like as long as it constantly presses the seat plate 54 in one direction, or other elastic body made of a resin material or metal material having a high elastic force. There may be.

  Furthermore, although the operation tool 1 demonstrated the structure provided with the vacuum valve 52 in the example mentioned above, it is not limited to this. For example, when the arc-extinguishing cylinder is provided in the cylindrical cutout, a configuration without the vacuum valve 52 may be used. The operation tool 1 having such a configuration may be configured such that, for example, the holding member 14 is provided in the frame 51 of the attachment 12 in the outer body 11, and the operation rod 16 is connected to the frame 51. It is not necessary to have the plate 54, the coil spring 55, the pressing member 56, and the guide pin 57.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the embodiments may be appropriately combined as much as possible, and in that case, the combined effect can be obtained. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be obtained as an invention.

Claims (12)

In the special high voltage distribution line cylindrical cutout used to protect the primary side of the transformer in the special high voltage distribution line, the fuse cylinder inserted in the insulator of the cutout is pulled out to make the transformer an extra high voltage distribution. An operating tool for separating from the track,
It is mechanically and electrically connected to the fuse cylinder, and at the time of connection, the fuse cylinder is mechanically gripped, and electrically includes a large current interrupting unit that is connected in parallel with the fuse of the fuse cylinder, Further, when the fuse cylinder is pulled out, after the fuse is disconnected from the electric circuit, the interrupting part of the large current interrupting part opens the electric circuit, and the operating tool comprising an outer body and an attachment. In the special high voltage distribution line cylindrical cutout used to protect the primary side of the transformer in the special high voltage distribution line, the fuse cylinder inserted in the insulator of the cutout is pulled out to make the transformer an extra high voltage distribution. An operating tool for separating from the track,
A vacuum valve that electrically disconnects the electrical path by opening and electrically connects the electrical path by closing; and
Circuit generating means for generating a parallel circuit of the fuse cylinder and the vacuum valve;
Opening means for opening the vacuum valve;
Closing means for closing the opened vacuum valve;
Timing control means for controlling the opening means to open the vacuum valve closed by the closing means after disconnecting the fuse cylinder from the lower electrode when pulling out the fuse cylinder from the insulator;
An operating tool comprising An outer shell having a connecting means for connecting to a lower part of the insulator, which is a cylindrical type;
The vacuum valve, the opening means, the closing means, the contact with the first current-carrying shaft of the vacuum valve, the contact with the fuse cylinder and the holding member for gripping the fuse cylinder, and the vacuum valve, the closing circuit An attachment for fixing the means and the holding member, and having a holding means having a frame movable relative to the outer body, and being accommodated in the outer body and moving relative to the outer body;
Further comprising
The opening means includes a coil spring that opens the vacuum valve, and a disc-like shape with respect to a second energizing shaft of the vacuum valve that has two or more notches in the circumferential direction, supports the coil spring, and rotates. With a seat plate,
The closing means has a pressing means that presses the seat plate in the compression direction of the coil spring by contacting the seat plate in the axial direction and is not in contact with the seat plate by facing the notch. ,
The operation tool according to claim 2.   The circuit generating means forms the parallel circuit together with the vacuum valve, one end is connected to the second energizing shaft, and the other end is connected to the lower electrode when the outer body is inserted into the insulator. The operation tool according to claim 3, wherein the outer body has a conductive portion.   The timing control means is provided on the outer body and is provided with a guide inclined in the axial direction, provided on a side surface of the seat plate, and moved along the guide, thereby rotating the seat plate, The operating tool according to claim 4, wherein the pressing means is opposed to the notch after the fuse cylinder held by the holding means is separated from the lower electrode. Opening the electrical circuit of the parallel circuit by opening it, provided in the circuit generating means for generating a parallel circuit in parallel with the fuse cylinder connected to the upper electrode and the lower electrode provided in the insulator of the cylindrical cutout Electrically connecting the electric circuit of the parallel circuit by operating a vacuum valve that electrically connects the electric circuit of the parallel circuit by closing means and closing the circuit,
Inserting an outer body into the insulator and generating the parallel circuit by the circuit generation means;
Separating the fuse cylinder from the lower electrode;
After disconnecting the fuse cylinder from the upper electrode, controlling the opening means for opening the vacuum valve to open the vacuum valve closed by the closing means;
Separating the fuse cylinder from the upper electrode after opening the vacuum valve;
A method of pulling out a cylindrical cut-out fuse cylinder. Frame,
A vacuum valve fixed to the frame, electrically connected to a cylindrical cutout fuse cylinder, having a driving body that moves in an axial direction at one end, and electrically shuts off when the driving body moves; ,
A shaft body having one end fixed to the drive body;
A disc-shaped seat plate having a notch provided in a part of the circumferential direction and fixed to the other end of the shaft body;
A biasing means provided between the seat plate and the vacuum valve, and biasing the seat plate in a direction away from the vacuum valve;
A pressing member that presses the seat plate in the axial direction toward the vacuum valve and releases the pressing by being positioned in the notch,
A guide member for rotating the seat plate;
Attachment with. A holding member for holding a cylindrical cut-out fuse cylinder;
The frame having the holding member fixed thereto, the frame electrically connected to the fuse cylinder and having a driving body that moves in an axial direction at one end, and the electrical connection is cut off by the movement of the driving body. A vacuum valve fixed to the shaft, a shaft body having one end fixed to the drive body, a disc-shaped seat plate having a notch provided in a part of the circumferential direction, and fixed to the other end of the shaft body, An urging means provided between the seat plate and the vacuum valve, for urging the seat plate in a direction away from the vacuum valve, and pressing the seat plate in the axial direction toward the vacuum valve; A pressing member for releasing the pressing by being located in the notch, and an attachment including a guide member for rotating the seat plate;
An outer body housing the attachment so as to be movable in the axial direction;
An operating rod provided on the attachment;
An operating tool comprising A guide hole provided in the outer body and extending in a direction inclined in the axial direction; and a guide member provided in an outer peripheral surface of the seat plate and having a guide pin that moves through the guide hole;
When the holding member holds the fuse cylinder, the guide member moves in the axial direction within the outer body, and the fuse cylinder is separated from the secondary electrode of the cylindrical cutout. The operating tool according to claim 8, wherein the guide pin is moved through the guide hole to rotate the seat plate and position the pressing member at the notch.   A plurality of the holding members are provided, and a connection fitting that engages with an engaging portion provided in the fuse cylinder in the axial direction by being closed, and an operating body that is operated by pressing and that contacts a lower end of the fuse cylinder. The operation tool according to claim 8, further comprising: a moving body that opens and closes the connection fitting by operation of the operation body.   The operation tool according to claim 8, wherein the outer body has a fitting pin that fits into a groove provided in the cylindrical cutout at a distal end. A plurality of connection fittings that are engaged in an axial direction with an engagement portion provided in a fuse cylinder of a cylindrical cut-out by closing, an operation body that is operated by pressing, contacting a lower end of the fuse cylinder, and A holding member comprising a moving body that opens and closes the connection fitting by operation of the operation body;
An operating rod connected to the holding member;
An operating tool comprising

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