JP4807940B2 - Method of attaching / detaching high-voltage hot-wire ammeter, holder and operation tool - Google Patents

Description

  The present invention relates to a method for attaching / detaching an ammeter to / from a high-voltage live wire, and particularly to a method for attaching / detaching a clamp-type recording ammeter in an indirect hot-wire method, and a holder and an operation tool for the clamp-type recording ammeter used in the method.

A CT clamp type recording ammeter is known as a recording ammeter that measures and records a passing current in an electric wire without cutting. This recording ammeter includes an openable and closable CT clamp (clamp portion) that surrounds an electric wire so as to intersect with its axis and generates a magnetic field corresponding to a passing current inside. Here, CT means a current transformer. The recording ammeter measures the current flowing through the electric wire based on the strength of the magnetic field generated in the CT clamp while the electric wire is surrounded by the CT clamp.
JP-A-64-38662

  However, in the case of a recording ammeter applied to a high-voltage hot wire, its attachment or removal must be performed by the indirect hot wire method, but the ready-made dedicated tool used in the method is expensive and attached. Only the number of recording ammeters is required. For this reason, there exists a possibility that the burden in the cost side in the measurement operation | work with respect to a high voltage | pressure hot wire may become large. On the other hand, it is very difficult to tentatively use an indirect hot wire tool other than such a dedicated tool to attach or remove the recording ammeter to the high voltage hot wire. For this reason, there exists a possibility that the working efficiency in the measurement operation | work with respect to a high voltage | pressure hot wire may fall.

  This invention is made | formed in view of this subject, The place made into the objective is to provide the attachment or detachment method of the high voltage hot wire ammeter which makes the measurement operation | work with respect to a high voltage hot wire low-cost and highly efficient. is there.

  The invention for solving the above-mentioned problems is to support a pair of openable and closable clamp portions that are attached so as to surround a high-voltage live wire by being closed by an urging force, and to support the pair of clamp portions so as to be openable and closable. A main body that pivotally supports at least one of the clamp parts so as to be rotatable around a shaft part, and a fixing means provided on the main body for fixing the pair of clamp parts in the closed state. A method for attaching and detaching a high-voltage live-line ammeter that attaches or detaches a clamp-type ammeter that measures the current based on a magnetic field induced in the pair of clamp portions by a current flowing through the high-voltage live line. The step of attaching the clamp type ammeter includes at least two abutting parts while holding the clamp type ammeter with a holder having a holder part capable of holding the main body. When the operating tool is operated, the one abutting portion comes into contact with the inside of the one clamp portion in the closed state to form an action point, and the other abutting portion comes into contact with the holder portion. The operation tool is disposed on the one clamp part and the holder part so as to form a fulcrum, and the one clamp part is rotated around the shaft part in a direction against the biasing force. An open state holding step in which the clamp part is opened and the open state is maintained, and the pair of clamp parts are arranged so as to surround the high-pressure live wire under the holding by the holder, and the open state is maintained. An open state stop step for stopping the operation to be in the closed state, and the holding means by the operating tool to fix the pair of clamp portions to the closed state under the holding by the holding tool. Closed state operation And step comprises provided with a holder detachment step of detaching the retainer from the clamp type current meter.

  According to this method for attaching and detaching a high-voltage live-line ammeter, while holding the clamp-type ammeter by the holder, the operating tool is moved to the one clamp part and the one according to the lever principle having the action point and the fulcrum. By acting on the holder portion, the one clamp portion can be rotated around the shaft portion against the biasing force, and the open state can be maintained.

  In addition, the pair of clamp portions are arranged so as to surround the high-voltage live wire, and the operation of maintaining the open state is stopped, so that the biasing force is released and the pair of clamp portions are turned into the high-voltage live wire. Can be hung.

  Furthermore, after operating the fixing means so as to fix the pair of clamp portions in the closed state by the operating tool, the holding tool is removed from the clamp-type ammeter so that the clamp-type ammeter is It can be reliably hung from a high-pressure live wire. Thereby, the said attachment process in the attachment or detachment method of a high voltage hot wire ammeter can be implemented efficiently.

  On the other hand, if the holder has a holder portion having a box shape, for example, and the operation tool is made of, for example, a bind hammer having the two contact portions, these tools are relatively Since it has a simple structure, it can be a relatively inexpensive indirect hot tool. Therefore, it is possible to reduce the cost and increase the efficiency of the measurement work for the high-voltage hot wire.

  In the method for attaching and detaching the high-voltage live-line ammeter, the step of removing the clamp-type ammeter further includes holding the clamp-type ammeter with the holder and fixing the pair of clamp portions in the closed state. A closed state releasing step of operating the fixing means with the operating tool, an open state re-holding step of performing the open state holding step again following the closed state releasing step, and the holding tool It is preferable that a holding tool separating step for separating the pair of clamp portions from the high-pressure live wire under holding is provided.

  According to this method for attaching and detaching a high-voltage live-line ammeter, the clamp-type ammeter is held by the holding tool, and the holding tool is used to release the closed state of the pair of clamp portions. After operating the means, the pair of clamp portions can be kept open according to the lever principle, and the pair of clamp portions can be separated from the high-pressure live wire.

  Thereby, the said clamp type ammeter can be reliably removed from the said high voltage | pressure hot wire, opening said pair of clamp part against the said urging | biasing force. Here, as described above, the holding tool and the operation tool may be a relatively inexpensive indirect live tool. Therefore, the measurement work for the high-voltage hot wire can be reduced in cost and efficiency.

  In the method of attaching and detaching the high-voltage live wire ammeter, the clamp-type ammeter has the pair of clamp portions on the upper surface portion of the main body, and has the fixing means on the side surface portion of the main body, The fixing means includes a guide portion provided on the upper surface side of the side surface portion on the one clamp portion side, and guides upward or downward in the guide portion to fix the one clamp portion in the closed state or A movable portion movable in the vertical direction to release the fixing, and the holder includes the holder portion and an insulating operation rod that can be attached and detached at one end portion. And a first opening formed in a portion corresponding to the upper surface portion of the main body of the clamp-type ammeter, and a first opening side defining the first opening gradually toward the outside. A hem provided to open to the A second opening formed in a portion corresponding to the upper surface side of the side surface portion on the one clamp portion side of the main body of the plug type ammeter, and a second opening defining the second opening portion A pair of projecting pieces provided so as to extend in the vertical direction at the sides and face each other, and a pair of projecting pieces provided so as to be separated from each other at the ends of the pair of projecting pieces as compared with each other. A locking portion provided to lock the contact portion of the operating tool as the fulcrum between the end piece, the skirt portion on the one clamp portion side, and the pair of projecting pieces; The operating tool has a head part and an insulating operating rod that can be attached and detached at one end, and the head part has a main bar member that is in the same direction as the insulating operating bar; It is preferable to have two rod members which are provided so as to intersect the main rod member and which are the two contact portions. There.

  According to this method for attaching and detaching a high-voltage live-line ammeter, when the operating tool is appropriately operated in the closed state fixing step or the closed state releasing step to bring the contact portion closer to the fixing means, the contact portion Is first guided to the projecting piece by the end piece, and then easily guided to the second opening, that is, the fixing means, by the projecting piece. In addition, when the operation tool is appropriately operated to move the movable part of the fixing means upward or downward by the contact part, the contact part is guided by the two opposing projecting pieces along the vertical direction. By doing so, the movement becomes smooth. Therefore, the operation of the fixing means by the operation tool becomes efficient.

  Further, according to the method for attaching and detaching the high-voltage live wire ammeter, in the open state holding step, the contact portion of the operation tool is locked to the locking portion located above the second opening. The Therefore, the operation tool can be operated without interfering with the fixing means exposed at the second opening, and the operation becomes efficient.

  Further, according to the method for attaching and detaching the high-voltage live-line ammeter, prior to the closed state releasing step, for example, when the holder is appropriately operated to bring the holder portion close to the main body of the clamp-type ammeter, the hem The bottom part of the main body that is in contact with the part is guided to the bottom part. Therefore, the clamp type ammeter can be efficiently held by the holder.

  In addition, according to the method for attaching and detaching the high-voltage live-line ammeter, in the open state holding step, the action point and the fulcrum in the lever principle correspond to the two bar members, respectively, For example, by using the other end portion as a power point, the one clamp portion can be rotated around the shaft portion against the biasing force to maintain the open state of the pair of clamp portions. In the closed state fixing step or the closed state releasing step, the movable portion can be moved by one of the two bar members. Therefore, the operation of the open state holding step, the closed state fixing step, and the closed state releasing step can be executed by the operation tool having a relatively simple configuration.

  Further, in the method for attaching and detaching the high-voltage live-line ammeter, in the open state holding step or the open state reholding step, the other end portion of the insulating operating rod of the operating tool has a force point with respect to the action point and the fulcrum. It is preferable to make it.

  In the method for attaching and detaching the high-voltage live wire ammeter, in the open state stop step, the pair of clamp portions are disposed so as to surround the high-voltage live wire under the holding by the holding tool, and the open state In order to stop the holding operation and to make the closed state, the holder portion of the holding tool is arranged so as to be arranged while holding the contact state of the contact portion in the open state holding step. It is preferable to operate the insulation operation rod of the operation tool so as to release the contact state after operating both the insulation operation rod and the insulation operation rod of the operation tool.

  Further, in the method for attaching / detaching a high-voltage live-line ammeter, in the closed state fixing step or the closed state releasing step, the movable portion is moved upward or downward along the guide portion by one of the two bar members. It is preferable to operate the insulating operating rod of the operating tool.

  In the method for attaching and detaching the high-voltage live wire ammeter, it is preferable that the insulating operation rod of the holder is operated so that the holder part is detached from the main body in the holder removing step.

  In the method for attaching and detaching the high-voltage live wire ammeter, in the holder separating step, the holder portion is moved downward while maintaining the contact state of the contact portion in the open state re-holding step. Furthermore, it is preferable to operate both the insulating operating rod of the holding tool and the insulating operating rod of the operating tool.

  Further, the invention for solving the above-described problem is that a pair of clamp parts that can be opened and closed attached so as to surround the high-voltage live line when being in a closed state, and the pair of clamp parts can be opened and closed at the upper surface part. A main body to be supported; a guide portion provided on the upper surface side of at least one of the side surfaces of the clamp portion in the main body; the guide portion being guided upward or downward in the guide portion; Fixing means having a movable portion movable in the up-down direction to perform fixing in the closed state or releasing the fixing, and based on a magnetic field induced in the pair of clamp portions by a current flowing through the high-voltage live wire A clamp-type ammeter for measuring the current is a holder used in a method for attaching / detaching a high-voltage live-line ammeter attached to or detached from the high-voltage live-line, A holder portion capable of holding the main body, wherein the holder portion has a first opening formed in a portion corresponding to the upper surface portion of the main body of the clamp-type ammeter, and the movable means of the fixing means. Corresponding to the upper surface portion side of the side surface portion on the one clamp portion side of the main body of the clamp type ammeter so that an operating tool for moving the portion upward or downward can be guided to the fixing means. A second opening formed in the portion, and a pair of projecting pieces provided so as to extend in the vertical direction at the second opening side that defines the second opening and to face each other Become.

  Further, in the holder used in the method for attaching and detaching the high-voltage live-line ammeter, the end portions of the pair of projecting pieces in the holder portion have a pair of ends so as to be separated from each other compared to the projecting pieces. It is preferable that a piece is further provided.

  Further, in the holder used in the method for attaching and detaching such a high-voltage live-line ammeter, the first opening side of the holder portion that defines the first opening portion may be gradually opened outward. It is preferable that a part is further provided.

  Further, in the holder used in the method for attaching and detaching the high-voltage live-line ammeter, the operation tool has a head part and an insulating operation rod that can attach and detach the head part at one end, and the head part It is preferable to have a main bar member having the same direction as the insulating operation bar and a bar member provided so as to intersect the main bar member.

  Further, in the holder used in the method for attaching and detaching the high-voltage live-line ammeter, the insulating operation rod of the operation tool is moved so that the movable portion is moved upward or downward along the guide portion by the rod member. It is preferable to operate.

  Moreover, the invention for solving the above-described problems is a pair of openable and closable clamp portions that are attached so as to surround a high-pressure live wire by being closed by an urging force, and the pair of clamp portions are supported to be openable and closable. Therefore, a main body that pivotally supports at least one of the clamp portions so as to be rotatable around the shaft portion, and a fixing means that is provided on the main body and fixes the pair of clamp portions in the closed state. A clamp-type ammeter that measures the current based on a magnetic field induced in the pair of clamp portions by a current flowing through the high-voltage live wire, and is attached to or removed from the high-voltage live wire An operation tool used in an attachment / detachment method, wherein the one clamp part in the closed state in the clamp-type ammeter in which the main body is held by a holding tool is moved forward around the shaft part. In order to rotate in a direction against the urging force to open, one of the clamps abuts the inside of the one clamp part to form an operating point, and the other abuts the holder to form a fulcrum It has at least two contact parts.

  Further, in the operating tool used for the method of attaching and detaching the high-voltage live wire ammeter, the clamp-type ammeter has the pair of clamp portions on the upper surface portion of the main body, and the fixing means on the side surface portion of the main body. The fixing means includes a guide portion provided on the upper surface side of the side surface portion on the one clamp portion side, and is guided upward or downward in the guide portion, and the one of the clamp portions is It is preferable to have a movable portion that is movable in the up-down direction in order to perform the fixation in the closed state or the release of the fixation.

  Further, in the operation tool used in such a method for attaching and detaching a high-voltage live wire ammeter, the head portion having the two contact portions, and an insulating operation rod that can be attached and detached at one end portion, The head part preferably includes a main bar member that has the same direction as the insulating operation bar, and two bar members that are provided to intersect the main bar member and serve as the two contact parts.

  Moreover, in the operating tool used for the method of attaching / detaching the high-voltage live wire ammeter, it is preferable that the other end portion of the insulating operating rod forms a force point with respect to the action point and the fulcrum.

  Further, in the operation tool used in the method for attaching and detaching the high-voltage live line ammeter, the holder corresponds to the upper surface portion of the main body of the clamp-type ammeter so as to hold the main body of the clamp-type ammeter. A first opening formed in a portion to be formed, a skirt provided so as to gradually open outward at a first opening side defining the first opening, and the clamp-type ammeter A second opening formed in a portion corresponding to the upper surface side of the side surface portion on the one clamp portion side of the main body, and a second opening side defining the second opening portion in the vertical direction And a pair of projecting pieces provided so as to be opposed to each other, and between the hem part on the one clamp part side and the pair of projecting pieces in the holder part Has a locking portion for locking the bar member as the fulcrum. Vignetting was, it is preferable.

  Further, in the operation tool used in the method for attaching and detaching the high-voltage live-line ammeter, the insulating operation rod is configured to move the movable portion upward or downward along the guide portion by any one of the two rod members. It is preferable to operate.

  It is possible to reduce the cost and increase the efficiency of measurement work for high-pressure live wires.

=== Configuration of Recording Ammeter ===
As illustrated in the front view of FIG. 1, the recording ammeter 10 to which the high-voltage live-line ammeter attachment / detachment method of the present embodiment is applied mainly includes a pair of CT clamps (clamp portions) 12a and 12b. , And a main body 14. One CT clamp 12a (left side in FIG. 1) is fixed to the upper surface (upper surface portion) of the main body 14, and the other CT clamp 12b (right side in FIG. 14, which can be opened and closed with respect to the CT clamp 12a on the left side in FIG. When this opening and closing is performed manually, the handle 12c provided integrally with the end of the CT clamp 12b is operated. The CT clamp 12b is appropriately spring-biased so as to be normally closed with respect to the CT clamp 12a.

  Further, a lock mechanism (fixing means) 16 for the CT clamp 12b is provided on the right side surface (side surface portion) of the main body 14 in FIG. The lock mechanism 16 according to the present embodiment includes a lock button (movable part) 16a and a sliding groove (guide part) 16b. The lock button 16a is slidable in the vertical direction in FIG. 1 by being fitted in the sliding groove 16b on the side surface of the main body 14. When the lock button 16a is set at the upper part in FIG. 1 with respect to the sliding groove 16b, the CT clamp 12b having the handle 12c locked to the lock button 16a is kept closed with respect to the CT clamp 12a. It is fixed as it is. On the other hand, if the lock button 16a is set at the lower part in FIG. 1 with respect to the sliding groove 16b, the handle 12c is pivotally supported by the main body 14 and rotates to resist the spring bias, CT clamps 12a, 12b. It becomes possible to open each other.

  The recording ammeter 10 of the present embodiment is a memory that measures and records the value of the current flowing through the high-voltage live line A from the strength of the magnetic field generated around the high-voltage live line A with the high-voltage live line A at the center. It is a card type recording ammeter. That is, in order to measure the strength of the magnetic field generated in the pair of CT clamps 12a and 12b, the CT clamps 12a and 12b are formed of, for example, a core (not shown) around which a coil (not shown) is appropriately wound. ing.

=== Configuration of indirect hot-wire tool ===
As illustrated in the perspective view of FIG. 2, the attachment tool (holding tool) 20 used in the method for attaching and detaching the high-voltage live wire ammeter of the present embodiment is mainly a stainless steel container (holder part) 22, Insulating operation rod 24 is used. Here, the stainless steel container 22 accommodates the recording ammeter 10, and the insulating operation rod 24 can be attached to and detached from the stainless steel container 20 at one end.

  The stainless steel container 22 has a substantially rectangular parallelepiped shape and has an opening 22a (first opening) on the upper surface in the vertical direction. When the main body 14 of the recording ammeter 10 is stored in the stainless steel container 22, the CT clamps 12a and 12b are exposed from the opening 22a. Further, the stainless steel container 22 further has an opening 22b (second opening) at the lower part in the vertical direction from the opening 22a. When the main body 14 of the recording ammeter 10 is accommodated in the stainless steel container 22, the lock mechanism 16 is exposed from the opening 22b. Note that a rubber cushion (not shown) is provided on the inner surface of the bottom of the stainless steel container 22 of the present embodiment as a cushioning material and an electrical insulating material when the bottom of the main body 14 of the recording ammeter 10 abuts. Yes.

  The stainless steel container 22 of the present embodiment is formed, for example, by cutting, bending, and partially welding a stainless steel sheet of SUS304 into an appropriate shape. Therefore, the guide portions (projections) 221a and 221b, the edge portions (end pieces) 223a and 223b, and the flare portions (hem portions) 225a, 225b, 225c, and 225d described below are appropriately cut from one stainless steel sheet. It is drawn and bent.

The guide portions 221a and 221b are formed integrally with the side surface so as to protrude from the side surface of the container 22 at two opposing sides along the vertical direction of the rectangular opening portion 22b.
The edge portions 223a and 223b are provided integrally with the guide portions 221a and 221b so as to be gradually separated from each other as they protrude from the side surfaces of the container 22 at the ends of the guide portions 221a and 221b.
The flare portions 225a, 225b, 225c, and 225d are formed so that each of the four sides that define the opening portion 22a gradually opens upward.

  The end of the insulating operation rod 24 can be attached to and detached from an adapter 22c made of a stainless steel cap provided on the outer surface of the bottom of the stainless steel container 22. In addition, the adapter 22c and the insulation operation rod 24 of this Embodiment may have the structure similar to the indirect hot wire tool widely commercialized.

  As illustrated in the front view of FIG. 3, an operation tool (operation tool) 30 used in the method for attaching and detaching the high-voltage live wire ammeter of the present embodiment is mainly composed of a stainless steel head portion 32 and an insulation operation. And a bar 34. Here, the insulating operating rod 34 is detachable from the head portion 32 at one end thereof. That is, the tip of the insulating operation rod 34 can be attached to and detached from the adapter 33 formed of a stainless steel cap provided at the end of the head portion 32.

  In the head portion 32, for example, a stainless steel rod member (main rod member) of SUS304 is bent to form a first rod member (rod member, contact portion) 32a. A bar member (bar member, contact portion) 32b is welded in parallel with the first bar member 32a. In order to ensure the safety of the operator when handling the operation tool 30, spherical members 36a and 36b having substantially spherical shapes are provided at the tips of the first rod member 32a and the second rod member 32b. . In particular, the spherical member 36a has a flat spherical shape for the operation of the lock mechanism 16 described later.

  In addition, the adapter 33 and the insulation operation rod 34 of this Embodiment may have the structure similar to the indirect hot wire tool widely commercialized.

=== How to attach / detach the high-voltage hot-wire ammeter ===
<<< Mounting action >>>
The operation of attaching the recording ammeter 10 to the high-voltage hot wire A in the present embodiment will be described with reference to the drawings.

  As illustrated in the flowchart of FIG. 4, one worker holds the recording ammeter 10 whose lock mechanism 16 has been manually released by the attachment tool 20. The other operator grasps the operation tool 30, and as shown in FIG. 5, the first bar member 32a comes into contact with the CT clamp 12b from the inside thereof to form an action point (P), and the stainless steel container 22 is provided. The operating tool 30 is made to act so that the second bar member 32b contacts and forms a fulcrum (Q), and the CT clamp 12b is moved around the shaft portion 13 in the direction of the arrow in FIG. The CT clamps 12a and 12b are opened by rotating and held (S100).

  As illustrated in the external view of FIG. 5, the fulcrum (Q) is between the guide portions 221a and 221b and the flare portion 225a with respect to the action point (P) with respect to the inside of the CT clamp 12b of the operation tool 30. The force point (R) is located in the grip portion of the operator in the insulating operation rod 34 of the operation tool 30. That is, the CT clamp 12 b rotates around the shaft portion 13 based on the lever principle of the operation tool 30.

  Next, the two workers cooperatively move the attachment tool 20 and the operation tool 30 while maintaining the state of the operation tool 30 as a lever with respect to the CT clamp 12b, and the recording ammeter 10 is moved. The CT clamps 12a and 12b are placed close to the high-voltage live wire A as appropriate, and the high-voltage live wire A is surrounded (see FIG. 6). In this state, the operator holding the operation tool 30 stops the state of the operation tool 30 as a lever with respect to the CT clamp 12b, thereby closing the CT clamps 12a and 12b. 12b is suspended from the high-pressure live wire A (see FIG. 7) (S101).

  Next, in a state where one worker holds the recording ammeter 10 with the attachment tool 20, another worker uses a spherical member 36 a at the tip of the first rod member 32 a in the operation tool 30 to make stainless steel. The lock button 16a exposed from the opening 22b of the container 22 is slid vertically upward along the sliding groove 16b (see FIG. 8), and the CT clamps 12a and 12b are fixed in a closed state (S102).

  Next, as illustrated in the external view of FIG. 9, one worker appropriately moves the attachment tool 20 downward in the vertical direction, and removes the stainless steel container 22 from the recording ammeter 10 (S103).

  Note that step S100 described above corresponds to the open state holding step of the present embodiment, step S101 corresponds to the open state stop step of the present embodiment, and step S102 corresponds to the closed state fixing step of the present embodiment. Step S103 corresponds to the holder removal step of the present embodiment.

<<< Removal action >>>
The operation of removing the recording ammeter 10 from the high-voltage live wire A in the present embodiment will be described with reference to FIG. Note that the removal operation is substantially in reverse order of the attachment operation.
As illustrated in the flowchart of the figure, the attachment tool 20 is appropriately moved vertically upward, and the stainless steel container 22 is attached to the recording ammeter 10 (S200). Next, in a state where the recording ammeter 10 is held by the attachment tool 20, the lock button 16a exposed from the opening 22b of the stainless steel container 22 by the spherical member 36a at the tip of the first rod member 32a in the operation tool 30. Is slid vertically downward along the sliding groove 16b, and the fixed state of the CT clamps 12a and 12b is released (S201). Next, in a state where the recording ammeter 10 is held by the attachment tool 20, the first bar member 32 a comes into contact with the CT clamp 12 b from the inside to form an action point (P), and the stainless steel container 22 is second. The operating tool 30 is acted so that the bar member 32b contacts and forms a fulcrum (Q) (the lever operation), and the CT clamp 12b is rotated around the shaft portion 13 against the spring bias to perform CT. The clamps 12a and 12b are opened (S202). Next, the opened CT clamps 12a and 12b are separated from the high-voltage live line A while holding the recording ammeter 10 with the attachment tool 20 and holding the lever state of the operation tool 30 (S203). .

  The above-described step S201 corresponds to the closed state release step of the present embodiment, step S202 corresponds to the open state re-holding step of the present embodiment, and step S203 corresponds to the holder separation step of the present embodiment. Equivalent to.

  According to the method for attaching and detaching the high-voltage live wire ammeter according to the present embodiment, the recording ammeter 10 can be efficiently attached to and detached from the high-voltage live wire A. Here, the attachment tool 20 and the operation tool 30 are inexpensive hot-line tools because they have a simple configuration. Therefore, it is possible to reduce the cost and increase the efficiency of the measurement work for the high-voltage hot wire.

  In addition, according to the method for attaching and detaching the high-voltage live-line ammeter of the present embodiment, as illustrated in the external view of FIG. 8, in steps S102 and S201 described above, the first bar member 32a of the operation tool 30 is removed. When approaching the lock button 16a, the first bar member 32a is easily guided to the lock button 16a by the guide portions 221a and 221b. This guiding operation is further improved by guiding the edge portions 223a and 223b. Further, the vertical sliding by the guide portions 221 a and 221 b facilitates the vertical sliding of the lock button 16 a by the operation tool 30. Therefore, the operation of the lock mechanism 16 by the operation tool 30 becomes efficient, which leads to an increase in the efficiency of the measurement work for the high-pressure live line.

  Further, according to the method for attaching and detaching the high-voltage hot-wire ammeter of the present embodiment, as illustrated in the external views of FIGS. 5 and 6, the second rod of the operation tool 30 in steps S100 and S202 described above. The member 32b is locked between the guide portions 221a and 221b and the flare portion 225a. Therefore, the operation tool 30 can be operated without interfering with the lock mechanism 16, and the operation becomes efficient. This leads to higher efficiency of measurement work for high-voltage live wires.

  Further, according to the method for attaching and detaching the high-voltage live line ammeter according to the present embodiment, when the stainless steel container 22 is attached to the recording ammeter 10 in the above-described step S200, the recording ammeter 10 includes the flare portions 225a, 225b, It is guided by 225c and 225d to facilitate attachment. Therefore, the holding of the recording ammeter 10 by the attachment tool 20 becomes efficient, which leads to an increase in the efficiency of measurement work for a high-voltage live line.

=== Other Embodiments ===
The above-described embodiment is intended to facilitate understanding of the present invention, and is not intended to limit the present invention. The present invention is changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

  In the above-described embodiment, as a configuration of the fixing means, the lock button 16a slides up and down in the vertical direction in the slide groove 16b, but is not limited thereto. For example, the lock button 16a may be a push-down type. In this case, the lock button 16a may be pressed with the spherical member 36a at the tip of the first rod member 32a.

  In the above-described embodiment, the first bar member 32a is used for the vertical sliding of the lock button 16a in steps S102 and S201. However, the present invention is not limited to this. For example, the second bar member 32b may be used.

  In the embodiment described above, the operation tool 30 is used as the operation tool. However, the operation tool 30 is not limited to this, and the lever operation described above can be performed and the lock button 16a can be slid. Any indirect hot wire tool having a simple structure may be used. For example, the bind hitting tool 300 illustrated in the front view of FIG. 11 may be used, which includes the action point (P, contact portion) and the fulcrum (Q, contact portion) in the lever principle described above. I have.

It is a front external view of the clamp type ammeter of this embodiment. It is a perspective view of the holder of this Embodiment. It is a front view of the operating tool of this Embodiment. It is a flowchart which shows the clamp type ammeter attachment procedure of this Embodiment. It is an external view which shows the open state holding | maintenance step of the clamp type ammeter attachment procedure of this Embodiment. It is an external view which shows the open state stop step of the clamp type ammeter attachment procedure of this Embodiment. It is another external view which shows the open state stop step of the clamp type ammeter attachment procedure of this Embodiment. It is an external view which shows the closed state fixed step of the clamp type ammeter attachment procedure of this Embodiment. It is an external view which shows the holder removal step of the clamp type ammeter attachment procedure of this Embodiment. It is a flowchart which shows the clamp type ammeter removal procedure of this Embodiment. It is another front view of the operation tool of this Embodiment.

Explanation of symbols

10 Recording Ammeters 12a, 12b CT Clamp 12c Handle 13 Shaft 14 Body 16 Locking Mechanism 16a Lock Button 16b Sliding Groove 20 Attachment Tool 22 Stainless Steel Container 22a, 22b Opening 22c, 33 Adapter 221a, 221b Guide 223a, 221b Edge portion 225a, 225b, 225c, 225d Flare portion 24, 34 Insulating operation rod 30 Operation tool 32 Head portion 32a First rod member 32b Second rod member 36a, 36b Spherical member 300 Binding tool

Claims (8)

A pair of openable and closable clamps attached so as to surround the high-pressure live wire by being closed by an urging force;
A main body that pivotally supports at least one of the clamp portions so as to be rotatable around a shaft portion in order to support the pair of clamp portions so as to be opened and closed;
A fixing means provided on the main body for fixing the pair of clamp portions in the closed state;
A clamp-type ammeter that measures the current based on a magnetic field induced in the pair of clamp portions by a current flowing through the high-voltage live wire,
A method for attaching and detaching a high voltage live wire ammeter attached to or removed from the high voltage live wire,
The step of attaching the clamp-type ammeter includes
While holding the clamp-type ammeter with a holder having a holder part capable of holding the main body, an operation tool having at least two abutting parts is operated, inside the one clamp part in the closed state. The operation tool is attached to the one clamp part and the holder part so that one of the contact parts comes into contact to form an operating point, and the other contact part comes into contact with the holder part to form a fulcrum. An open state holding step in which the one clamp part is rotated around the shaft part in a direction against the biasing force to open the pair of clamp parts and hold the open state;
Under the holding by the holder, the pair of clamp portions are arranged so as to surround the high-voltage live wire, and an operation for holding the open state is stopped and the open state is stopped.
A closed state fixing step of operating the fixing means by the operation tool so as to fix the pair of clamp portions in the closed state under the holding by the holding tool;
A holder removing step of removing the holder from the clamp-type ammeter;
A method for attaching and detaching a high-voltage hot-wire ammeter characterized by comprising: The step of removing the clamp-type ammeter further comprises:
A closed state releasing step of operating the fixing means with the operating tool so as to release the fixed state of the pair of clamp portions while holding the clamp-type ammeter with the holding tool;
Following the closed state release step, an open state re-holding step for performing the open state holding step again,
A holding tool separating step for separating the pair of clamp parts from the high-pressure live wire under the holding by the holding tool;
The method for attaching and detaching a high-voltage hot-wire ammeter according to claim 1, comprising: The clamp-type ammeter has the pair of clamp portions on the upper surface portion of the main body, and the fixing means on the side surface portion of the main body,
The fixing means includes a guide portion provided on the upper surface side of the side surface portion on the one clamp portion side, and guides upward or downward in the guide portion to fix the one clamp portion in the closed state. Or a movable part movable in the vertical direction to release the fixation,
The holder has the holder part and an insulating operation rod that can be attached to and detached from the holder part at one end part,
The holder part is
A first opening formed in a portion corresponding to the upper surface of the main body of the clamp-type ammeter;
A hem provided to gradually open toward the outside at a first opening side defining the first opening;
A second opening formed in a portion corresponding to the upper surface portion side of the side surface portion on the one clamp portion side of the main body of the clamp-type ammeter;
A pair of projecting pieces provided so as to extend in the vertical direction at the second opening side defining the second opening and to face each other;
A pair of end pieces provided at the end portions of the pair of projecting pieces so as to be separated from each other compared to the projecting pieces;
A locking portion provided to lock the contact portion of the operating tool as the fulcrum between the skirt portion on the one clamp portion side and the pair of projecting pieces,
Have
The operation tool has a head portion and an insulating operation rod that can be attached and detached at one end portion of the head portion.
The head portion includes a main rod member that is in the same direction as the insulating operation rod, and two rod members that are provided to intersect the main rod member and serve as the two contact portions.
The method for attaching or detaching a high-voltage hot-wire ammeter according to claim 1 or 2.   4. The high pressure according to claim 3, wherein in the open state holding step or the open state reholding step, the other end portion of the insulating operation rod of the operation tool forms a force point with respect to the action point and the fulcrum. How to attach and detach the hot wire ammeter. In the open state stop step,
Under the holding by the holding tool, the pair of clamp portions are arranged so as to surround the high-voltage live wire, and the operation of holding the open state is stopped to be the closed state.
Both the insulating operating rod of the holding tool and the insulating operating rod of the operating tool are arranged so that the holder portion is disposed upward while maintaining the contact state of the contacting portion in the open state holding step. After operating
Operating the insulation operating rod of the operating tool to release the contact state;
The method for attaching and detaching a high-voltage hot-wire ammeter according to claim 3.   In the closed state fixing step or the closed state releasing step, the insulating operation rod of the operation tool is moved so that the movable portion is moved upward or downward along the guide portion by one of the two rod members. The method of attaching or detaching a high-voltage hot-wire ammeter according to claim 3, wherein the method is operated.   The method of attaching or detaching a high-voltage live line ammeter according to claim 3, wherein, in the holding tool removing step, the insulating operation rod of the holding tool is operated so as to remove the holder portion from the main body.   In the holding tool separating step, the insulating operating rod of the holding tool and the operating tool are moved so as to move the holder portion downward while holding the contact state of the contact portion in the open state re-holding step. The method for attaching and detaching a high-voltage hot-wire ammeter according to claim 3, wherein both the insulating operation rods are operated together.

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