JP2017117680A - Ground tool for mega ring filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground tool for mega ring filter capable of improving safety and work efficiency in measurement work of insulation resistance using an insulation resistor.SOLUTION: A ground tool 1a for mega ring filter is structured by fitting a hook opening/closing part 2 to a hook 61 in the vicinity of a connection location with an insulation rod 60 and fitting a wire operation part 3 in the vicinity of a lower end of the insulation rod 60. The hook opening/closing part 2 comprises: a hook opening/closing part body 7 of a hollow structure; a closing tool 8 in a long and rectangular parallelepiped shape erected on a top face of the hook opening/closing part body 7 in such a manner that its upper part can be brought into contact with or approach a distal end 61a of the hook 61; a conduction body 9a (not shown in the figure) installed within the hook opening/closing part body 7 in a state where an upper end of a cable 62 is electrically connected; and a conduction body 9b which is electrically connected to the hook 61 in such a manner that the conduction body is brought into contact therewith, and at least partially installed within the hook opening/closing part body 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a megaring filter grounding tool used in an insulation resistance measurement work using an insulation resistor, and more particularly to a megaring filter grounding tool capable of improving safety and work efficiency in the above work.

  When measuring the insulation resistance of each phase in a parallel two-line three-phase transmission line installed between the substation and the transmission tower, after suspending the line to be measured, the remaining two lines In order to attenuate the induced voltage generated by the influence, a grounding tool is installed for the line.

Here, a method for measuring insulation resistance using a mega ring filter and an insulation resistor will be described with reference to FIGS. 11 and 12 are a diagram schematically showing a procedure for measuring an insulation resistance using a megaring filter according to the prior art, and a flowchart showing the procedure.
The electrical equipment 50 shown in FIGS. 11 (a) and 11 (b) illustrates the power transmission end of the disconnector. The disconnect switch is used to open and close the transmission line from the substation facility in a circuit, and is used between the substation facility and the transmission line. The electrical equipment 50 includes three support insulators 51 provided so as to correspond to the three phases, and a gantry 52 that supports the support insulators 51, and the above-described cable is connected to the power transmission line via the support insulators 51. ing. A grounding attachment terminal 53 for attaching a grounding tool 54 and a mega ring filter 59 is provided on the support insulator 51.

  The grounding tool 54 has a structure in which a grounding metal 58 is connected to a hook 56 provided at the tip of an insulating rod 55 via a cable 57. In addition, the mega ring filter 59 is connected to a hook 61 provided at the tip of the insulating rod 60 via a cable 62 with a ground metal fitting 64 and to a line terminal 65 and a ground terminal 66 via a cable 63. ing.

First, in order to discharge the electric charge remaining in the electric equipment 50, the hook 56 of the grounding tool 54 is connected in a state where the grounding metal 58 is connected to the grounding portion provided on the mount 52 as shown in FIG. It attaches to the ground attachment terminal 53 (step S1 in FIG. 12).
Next, as shown in FIG. 11 (b), the grounding metal 64 is connected to the grounding location provided on the mount 52, and the line terminal 65 and the grounding terminal 66 are grounded to the line connection terminal 68 of the insulation resistor 67. The hook 61 of the mega ring filter 59 is attached to the ground attachment terminal 53 while being connected to the terminal 69 (steps S2 to S4 in FIG. 12).

  Thereafter, the grounding tool 54 is removed (step S5 in FIG. 12), the insulation resistor 67 is turned on, and the measurement of the insulation resistance is started (step S6 in FIG. 12). When the measurement of the insulation resistance is completed (step S7 in FIG. 12), the grounding tool 54 is attached to the electric facility 50 again (step S8 in FIG. 12), and the mega ring filter 59 is removed in this state (step S9 in FIG. 12). Finally, the grounding tool 54 is removed (step S10 in FIG. 12).

  Generally, a long object of 1.5 m or more is often used for the grounding tool 54 and the insulating rods 55 and 60 of the mega ring filter 59 in order to ensure insulation. And in the above-mentioned work, it is necessary to attach and detach such two kinds of long objects many times. Furthermore, since the grounding tool 54 and the mega ring filter 59 are heavy, handling is not easy. Therefore, the conventional mega ring filter 59 has a problem that the workability when measuring the insulation resistance is poor. Further, if the worker attaches or removes the mega ring filter 59 without grounding with the grounding tool 54, a serious accident may occur.

For example, Patent Document 1 discloses an invention relating to an “insulation resistance measuring instrument” that measures the insulation resistance of a transmission line via a mega ring filter as a means for improving the working efficiency when measuring insulation resistance. .
The present invention is characterized in that it has a “screw type” terminal to which a “flat type” ground terminal and a line terminal of the mega ring filter are connected, and the connection with the mega ring filter becomes easy. Has the effect of reducing the burden on the user.

Patent Document 2 discloses an invention relating to a “discharge grounding rod” which is not related to a mega ring filter but is used in an operation of discharging residual charges of a high voltage capacitor and a cable.
The present invention is characterized by comprising an electrode for performing resistor discharge, an electrode for performing direct ground discharge, and a resistor built in the transparent insulating material case. Since it can be performed with a grounding rod, it has the effect of improving convenience and safety in use.

JP 2012-237731 A Japanese Patent Laid-Open No. 08-31471

In the invention described in Patent Document 1, although the burden on the operator is certainly reduced in the connection work between the insulation resistance measuring instrument and the mega ring filter, there are two types of long and heavy grounding tools and mega ring filters. Since a tool must be used, workability at the time of measuring insulation resistance cannot be improved.
In addition, in the invention described in Patent Document 2, the idea of integrating two types of tools is disclosed, but the above-described work procedure remains unchanged by simply integrating the grounding tool and the mega ring filter. The workability is hardly improved because a heavy long object needs to be attached to or detached from the measurement object many times. Furthermore, it is impossible to prevent human error such as forgetting to attach the grounding tool.

  The present invention has been made in response to such a conventional situation, and provides a grounding tool for a mega ring filter capable of improving safety and work efficiency in an insulation resistance measurement work using an insulation resistor. With the goal.

  In order to achieve the above object, according to a first aspect of the present invention, there is provided a megaring filter having a hook on an upper portion of an insulating rod, a hollow hook opening / closing portion body installed in the vicinity of a connection portion between the hook and the insulating rod, A wire operating part installed near the lower end, a wire connected to one end of the wire operating part and movable along the longitudinal direction of the insulating rod, and the tip end side of the hook end being separated Installed to close or open the opening of the hook and connect the other end of the wire, and to be connected to the grounding metal via the cable and detachable from the hook The wire is moved along the longitudinal direction of the insulating rod in accordance with the operation of the wire operating portion, and the obturator is pulled by the wire to close the opening of the hook. It is installed in the hook opening / closing unit main body so that it can be switched from the open state to the open state, and the conduction means is installed in the hook opening / closing unit main body so that a part of the conducting means can contact the hook by being pulled by the wire. is there.

  In the grounding tool for a mega ring filter having such a structure, when the wire operating unit is operated to move the wire along the longitudinal direction of the insulating rod, the opening / closing state of the opening of the hook, the hook and the grounding metal It has the effect | action that a conduction | electrical_connection state switches, respectively. In other words, since the present invention has the functions of both a conventional grounding tool and a mega ring filter, the measurement of insulation resistance is different from the case of using the conventional mega ring filter before and after the use of the mega ring filter. There is no need to install or remove the grounding tool.

  Further, according to a second invention, in the first invention, the obturator is rotatably held at the proximal end side by the hook opening / closing portion so that the distal end side can be rotated and separated from the distal end of the hook. It is characterized in that it is installed so that the tip side rotates in a direction away from the tip of the hook when pulled by the wire.

  In the grounding tool for a mega ring filter having such a structure, in addition to the action of the first invention, when the obturator is pulled and rotated by the wire in accordance with the operation of the wire operation portion, and the tip side thereof is separated from the hook. While the opening of the hook is opened, the opening of the hook is closed when the obturator is rotated in the reverse direction and the tip side comes into contact with the hook.

According to a third invention, in the first invention, the obturator moves along the longitudinal direction of the insulating rod and is held by the hook opening / closing portion so that the tip side can be separated from and attached to the tip of the hook. It is characterized in that it is installed so that the tip side moves in a direction away from the tip of the hook when pulled.
In the grounding tool for a mega ring filter having such a structure, in addition to the action of the first invention, the obturator is pulled by the wire in accordance with the operation of the wire operating portion and moves along the longitudinal direction of the insulating rod, When the tip side is separated from the hook, the opening of the hook is opened. On the other hand, when the obturator moves in the reverse direction and the tip comes into contact with the hook, the opening of the hook is closed.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the conducting means is detachable from the hook by moving along the longitudinal direction of the insulating rod and is pulled by the wire. It is characterized in that the portion in contact with the hook is movably installed in a direction away from the hook.
In the grounding tool for a mega ring filter having such a structure, in addition to the operation of any one of the first to third inventions, the conducting means is pulled by the wire in accordance with the operation of the wire operating portion, and the insulating rod When moving along the longitudinal direction and contacting the hook, the conducting means and the hook are conducted, so that the hook is electrically connected to the grounding metal via the conducting means and the cable, while the conducting means moves in the opposite direction. When the hook is separated from the hook, the conduction state between the conduction means and the hook is released, and the hook is not electrically connected to the grounding metal.

According to a fifth aspect of the present invention, in any one of the first to third aspects, the conducting means is rotatably held at the base end side by the hook opening / closing portion so that the distal end side can be rotated and detached from the hook. And a connection fitting that is installed so that the distal end side rotates in a direction away from the hook when pulled by the wire.
In the grounding tool for a mega ring filter having such a structure, in addition to the operation of any one of the first to third inventions, the connection fitting is pulled by the wire and rotated in accordance with the operation of the wire operation unit. When the hook comes into contact, the connection bracket and the hook become conductive, so that the hook is electrically connected to the grounding bracket via the connection bracket and the cable, while the connection bracket rotates in the opposite direction and moves away from the hook. The conductive state between the connection fitting and the hook is released, and the hook is not electrically connected to the grounding fitting.

According to a sixth invention, in any one of the first to fifth inventions, the conductive means is installed in a state in which it is always in contact with the hook, instead of being installed so as to be detachable from the hook. An insulating means is installed on the cable so that a part of the cable is disconnected and the disconnected part of the cable can be connected again.
In the grounding tool for a mega ring filter having such a structure, when a part of the cable is disconnected by operating the insulating means, the hook is not electrically connected to the grounding bracket, while the disconnected part of the cable is again connected. When connected, the hook has an effect of being electrically connected to the grounding metal via the cable.

A seventh invention is characterized in that, in any one of the first to sixth inventions, the obturator is provided with a spring member that urges the obturator in a direction in which a distal end side thereof abuts against a distal end of the hook. .
In the grounding tool for a mega ring filter having such a structure, in addition to the action of any one of the first to sixth inventions, the tip side that can come into contact with the tip of the hook is connected via a wire or the like so as to be separated from the hook. When the force applied to the obturator is weakened, the obturator is biased by the spring member, and the distal end side comes into contact with the distal end of the hook, and the opening of the hook is obstructed.

  In the first invention, when measuring insulation resistance, it is not necessary to handle two kinds of heavy long members such as a conventional grounding tool and a mega ring filter, so that operator fatigue is reduced. In addition, the time required for work is reduced. Also, unlike the case of using a conventional grounding tool and a megaring filter, an accident caused by “forgetting to attach the grounding tool before and after using the megaring filter” cannot occur. Therefore, the safety at the time of the measurement work can be greatly improved.

  According to the second invention, in addition to the effect of the first invention, the mechanism for opening and closing the opening of the hook can be realized with a simple structure, so that the manufacturing cost is reduced.

  According to the third invention, in addition to the effect of the first invention, the opening of the hook can be easily opened and closed by a mechanism different from that of the second invention, so that the manufacturing cost is reduced.

  According to the fourth invention, in addition to the effect of any one of the first to third inventions, the hook and the grounding metal can be conducted and the mechanism for releasing the conduction state can be realized with a simple structure. There is an effect that the manufacturing cost is reduced.

  According to the fifth invention, in addition to the effect of any one of the first to third inventions, the hook and the grounding metal are made conductive by a mechanism different from the fourth invention, and the conductive state is easily released. Therefore, the manufacturing cost can be reduced.

  According to the sixth aspect of the invention, the mechanism for making the hook and the grounding metal conductive and releasing the conductive state can be realized with a simpler structure than in the case of the first through fifth inventions. The effect of being reduced is further exhibited.

  According to the seventh invention, when the wire operating part is not operated, the opening of the hook is always closed by the closing tool, and the hook is released from the grounding attachment terminal of the electrical equipment. Therefore, there is an effect that safety during work is increased.

(A) And (b) is the front view and side view which respectively show the external appearance of Example 1 of the grounding tool for mega ring filters which concerns on embodiment of this invention, (c) and (d) are the same figure, respectively. In (a), they are the enlarged view which looked at the grounding tool for mega ring filters from the A direction, and the enlarged view of a BB arrow directional cross section. (A) And (b) is an enlarged view of the CC arrow directional cross section in Fig.1 (a). (A) And (b) is the side view and front view which respectively show the modification of the wire operation part in Example 1, (c) And (d) is the DD sectional view taken on the line in FIG. FIG. (A) And (b) is the front view and side view which respectively show the external appearance of Example 2 of the grounding tool for mega ring filters which concerns on embodiment of this invention, (c) is the mega of the figure (a). It is the enlarged view which looked at the grounding tool for ring filters from the H direction. (A) And (b) is an enlarged view of the II arrow directional cross section in Fig.4 (a). (A) And (b) is the front view and side view which respectively show the external appearance of Example 3 of the grounding tool for mega ring filters which concerns on embodiment of this invention, (c) is the mega of the figure (a). It is the enlarged view which looked at the grounding tool for ring filters from the K direction. (A) is an external appearance perspective view of the wire operation part in the grounding tool for mega ring filters of Example 3, (b) And (c) is the front view. (A) And (b) is an enlarged view of the LL line | wire arrow cross section in Fig.6 (a). (A) And (b) is the front view and side view which respectively show the external appearance of Example 4 of the grounding tool for mega ring filters which concerns on embodiment of this invention, (c) is the mega of the figure (a). It is the enlarged view which looked at the grounding tool for ring filters from the P direction. (A) And (b) is an enlarged view of the QQ line arrow cross section in Fig.9 (a). It is the figure which showed typically the procedure at the time of measuring an insulation resistance using the mega ring filter which concerns on a prior art. It is the flowchart which showed typically the procedure at the time of measuring an insulation resistance using the mega ring filter which concerns on a prior art.

  A grounding tool for a mega ring filter according to the present invention will be described with reference to FIGS. In the grounding tool for a mega ring filter according to the present invention, the operator holds the main body (insulating rod) in his hand and attaches the hook provided at the tip of the main body to the object to be measured overhead. Used. Therefore, in the following explanation, assuming the state when the grounding tool for a mega ring filter is used, the side where the hook is installed is referred to as “upper part”, and the one closer to the part held by the operator is “ "Bottom". Further, for the megaring filter grounding tool in FIGS. 1, 3, 4, 6, and 9, the cable 63, the line terminal 65, and the ground terminal 66 are not shown.

FIG. 1A and FIG. 1B each show the appearance of a grounding tool for a mega ring filter according to this embodiment. 1 (c) shows the state of the megaring filter grounding tool viewed from the direction A in FIG. 1 (a), and FIG. 1 (d) is a view taken along the line BB in FIG. 1 (a). A cross section is shown.
Further, FIGS. 2A and 2B are enlarged views of the cross section taken along the line CC in FIG. 1A.
However, in FIG. 1C, illustration of the wire and the tension coil spring is omitted, and in FIG. 1D, only the main body and the knob of the wire operation unit are hatched to show that they are cross sections. 2 (a) and 2 (b), the above hatching is applied only to the main body of the hook opening / closing portion, and the illustration of the cable to which the grounding metal fitting is connected is omitted. In addition, about the component shown in FIG. 11, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIGS. 1 and 2, the megaring filter grounding tool 1a has a hook opening / closing portion 2 attached to the hook 61 in the vicinity of a connection portion with the insulating rod 60 using a fixing belt 2a, and wire operation. The part 3 has a structure attached to the vicinity of the lower end of the insulating rod 60 using the fixed belt 3a.
The wire operation unit 3 includes a knob 6 to which one end of the wire 5 is connected, and a hollow main body 4 fixed to the insulating rod 60 by a fixing belt 3a. A guide hole 4a is formed long in the front surface of the main body 4 in a direction parallel to the axial direction when attached to the insulating rod 60, and the knob 6 is movable only in the longitudinal direction with respect to the guide hole 4a. By being fitted, the body 4 is held slidable in the axial direction of the insulating rod 60. Therefore, when the knob 6 is moved in the direction indicated by the arrow X in FIG. 1A or 1D, the wire 5 is pulled by the knob 6 and moves downward. The main body 4 is provided with cable insertion holes 4b and 4b on the upper and lower surfaces, and the cable 62 installed so as to penetrate the main body 4 is held movably in the vertical direction by the cable insertion holes 4b and 4b. Has been.

  The hook opening / closing portion 2 is erected on the upper surface of the hook opening / closing portion main body 7 so that the upper portion of the hook opening / closing portion main body 7 is fixed to the hook 61 by the fixing belt 2a and the tip 61a of the hook 61 is in contact with or close to the top. A long rectangular parallelepiped obturator 8 and a conductive body 9a (see FIG. 2) installed inside the hook opening / closing portion main body 7 with the upper end of the cable 62 electrically connected. It is electrically connected to the hook 61 so as to be in contact with it, and at least a part thereof is electrically connected to the conductor 9b and the base end is electrically connected to the conductor 9a. And a connection fitting 10 installed inside the hook opening / closing portion main body 7 so that the tip 10a contacts the conductive body 9b when pivoted.

  In addition, the hook opening / closing part 2 is externally attached to the obturator 8 so as to be slidable in the longitudinal direction, and the upper end of the wire 5 is connected to one end. A wire 12 a connected to the wire 5 inside the opening / closing part main body 7, a pair of wires 12 b and 12 b connecting the vicinity of the upper end of the obturator 8 and the cylindrical body 11 via the tension coil spring 13, and a tension coil spring 13 One end of the wire 12c connecting the vicinity of the upper end of the obturator 8 and the hook opening / closing portion main body 7 and the pivot shaft (not shown) of the base end of the connection fitting 10 and the other end of the hook opening / closing portion main body 7 are connected. , And a wire 12d coupled to the wire 5 inside.

  On the front surface of the hook opening / closing portion main body 7, a guide roller 14a (see FIG. 1) for guiding the wire 12a and a guide hole 14b for inserting the wire 12a are provided. In addition, wire insertion holes (not shown) are respectively provided on the upper and lower surfaces of the hook opening / closing portion main body 7, and the wire 5 penetrating the hook opening / closing portion main body 7 is movable in the vertical direction through the wire insertion holes. Is retained. Further, the obturator 8 is pivotally connected to the lower portion 8b via the hinge 8c (see FIG. 2B), and the upper portion 8a and the lower portion 8b are in a straight line. The vicinity of the upper end of the upper part 8 a is in contact with the tip 61 a of the hook 61. That is, the opening 61b of the hook 61 is closed in a state where the upper portion 8a and the lower portion 8b of the obturator 8 are in a straight line (see FIG. 2A), and the upper portion 8a is away from the tip 61a of the hook 61 (see FIG. It is released by rotating in the direction indicated by the arrow E in 2 (a) (see FIG. 2 (b)).

The wire 12c urges the upper part 8a of the obturator 8 in a direction approaching the tip 61a of the hook 61, and the wires 12b and 12b urge the cylindrical body 11 in a direction toward the upper end of the upper part 8a of the obturator 8. When the upper part 8a and the lower part 8b of the obturator 8 are in a straight line, the cylindrical body 11 is in a position that covers a part of the lower end of the upper part 8a and a part of the upper end of the lower part 8b connected to the hinge 12c. In this case, since the upper part 8a and the lower part 8b are fixed in an integrated state by the cylinder 11, the upper part 8a cannot be rotated with respect to the lower part 8b.
On the other hand, when the knob 6 of the wire operation unit 3 is slid downward, the tube 11 is pulled downward by being pulled by the wire 5. And when the cylinder 11 moves below the hinge 8c, the upper part 8a becomes rotatable with respect to the lower part 8b.

  As described above, one end of each of the wires 12 a and 12 d is connected to the wire 5. Therefore, when the wire 5 moves downward, the upper portion 8a of the obturator 8 is pulled by the wire 12a, and is separated from the tip 61a of the hook 61 against the tensile force of the tension coil spring 13 provided on the wire 12c (see FIG. 2 (a) in the direction indicated by arrow E). Further, when the wire 5 moves downward, one end of the wire 12d connected to the wire 5 is pulled downward, so that the pivot shaft of the base end of the connection fitting 10 around which the other end of the wire 12d is wound rotates. To do. As a result, the connection fitting 10 rotates as shown by an arrow F in FIG. 2A, and the tip 10a contacts the conductive body 9b (see FIG. 2B). As a result, the hook 61 is electrically connected to the cable 62 to which the ground metal fitting 64 is connected via the conductor 9b, the connection metal 10, and the conductor 9a. That is, the conductors 9a and 9b and the connection fitting 10 function as conduction means for conducting the hook 61 to the ground fitting 64 via the cable 62. In addition, as shown to Fig.2 (a), when the upper part 8a and the lower part 8b of the obturator 8 have made the straight line, the front-end | tip 10a of the connection metal fitting 10 is not contacting the conductor 9b.

Next, a modification of the wire operation unit 3 will be described with reference to FIG.
3 (a) and 3 (b) show modifications of the wire operation unit in the first embodiment, respectively, and FIGS. 3 (c) and 3 (d) are DD lines in FIG. 3 (b). An arrow cross section is shown. In FIGS. 3C and 3D, only the main body of the wire operation unit is hatched as described above, and the cable to which the grounding metal fitting is connected is omitted.
As shown in FIG. 3A to FIG. 3D, the wire operating portion 15 includes a hollow structure main body 16 that is fixed to the insulating rod 60 using a fixing belt 15a that is inserted into the belt insertion hole 16a. A lever handle 17 having a gripping portion 17 a and a long rectangular parallelepiped wire fixing portion 17 b and having a “F” shape in a side view, and a compression coil spring 18 built in the main body 16 are provided.

  The lever handle 17 projects a part of the grip portion 17a from an opening 16b provided on the front surface, and is rotatable about a shaft body 19 orthogonal to the central axis of the insulating rod 60 and the plane including the wire 5. It is installed inside the main body 16. On the upper surface of the wire fixing portion 17b, guide rollers 20a and 20b of the wire 5 are provided in the vicinity of the tip and the shaft body 19, and the main body 16 is connected to the inner wall surface 16c located above the guide roller 20a on the wire 5 The fixing tool 21 is provided, and an insertion hole (not shown) for the wire 5 is provided on the inner wall surface 16c located above the guide roller 20b. The wire 5 is inserted through the insertion hole into the main body 16 and wound around the guide rollers 20a and 20b, and the distal end of the wire 5 is fixed to the inner wall surface 16c by the fixture 21. The compression coil spring 18 is installed between the lower surface near the tip of the wire fixing portion 17b and the inner wall surface 16c, and the tip of the wire fixing portion 17b is urged upward by the compression coil spring 18. .

  In the wire operation unit 15 having such a structure, the lever handle 17 is rotated in the direction indicated by the arrow G in FIG. 3C until the operator holds the grip 17a until the state shown in FIG. Then, as shown by an arrow X in FIG. 3D, the wire 5 is pulled downward. On the other hand, if the operator weakens the gripping force of the grip portion 17a from this state, the lever handle 17 is rotated in the direction opposite to the arrow G by the action of the compression coil spring 18, and the state shown in FIG. In order to return, the wire 5 that has been pulled downward moves again upward.

  As described above, in the grounding tool 1a for the mega ring filter, the opening / closing state of the opening 61b of the hook 61, the hook 61, the grounding fitting 64, and the like can be performed by a simple operation of sliding the knob 6 of the wire operation unit 3. Each has a function of switching the conduction state. That is, the megaring filter grounding tool 1a has both functions of a conventional grounding tool and a megaring filter. Therefore, when measuring the insulation resistance using the megaring filter grounding tool 1a, the grounding tool must be attached and removed before and after using the conventional megaring filter (step of FIG. 12). The operations of S1, step S5, step S8 and step S10) are unnecessary.

As described above, according to the grounding tool 1a for a mega ring filter, it is not necessary to handle two kinds of heavy long members such as a conventional grounding tool and a mega ring filter when measuring insulation resistance. The operator's fatigue is reduced and the time required for the work is shortened. Also, unlike the case of using a conventional grounding tool and a megaring filter, an accident caused by “forgetting to attach the grounding tool before and after using the megaring filter” cannot occur. Therefore, the safety at the time of the measurement work can be greatly improved.
Further, since the mechanism for opening and closing the opening 61b of the hook 61 and the mechanism for connecting the hook 61 and the grounding metal 64 and releasing the conductive state are realized by a simple structure, the manufacturing cost can be reduced.
In addition, in the grounding tool 1a for the mega ring filter, when the wire operating unit 3 is not operated, the opening 61b of the hook 61 is always closed by the closing tool 8, and the grounding attachment terminal of the electric equipment Since there is no possibility that the hook 61 will come off unintentionally from the above, safety during work can be improved.

4 (a) and 4 (b) show the external appearance of the megaring filter grounding tool of the present embodiment, respectively. FIG. 4 (c) shows the megaring filter grounding tool H in FIG. 4 (a). The state seen from the direction is shown. Moreover, Fig.5 (a) and FIG.5 (b) have shown the II arrow directional cross section in Fig.4 (a).
In FIG. 5, the conductive body 9 a is shown as contacting the hook 61, but the conductive body 9 a is not actually connected to the hook 61. Further, in FIGS. 5A and 5B, only the main body and the guide member of the hook opening / closing portion are hatched to indicate a cross section. Furthermore, the same reference numerals are given to the components shown in FIGS. 1 and 2 and the description thereof is omitted.

As shown in FIGS. 4 and 5, the megaring filter grounding tool 1 b according to the present embodiment has the obturator 22 instead of the obturator 8 in the hook opening / closing portion 2 of the megaring filter grounding tool 1 a according to the first embodiment. Is installed.
The obturator 22 has a long rectangular parallelepiped shape, and is inserted into an insertion hole (not shown) provided on the upper surface of the hook opening / closing portion main body 7 so that the vicinity of the upper end can contact the tip 61a of the hook 61. The lower part is held by a guide member 23 installed inside the hook opening / closing part main body 7 so as to be slidable in the vertical direction.

The conducting body 9b electrically connected to the hook 61 is held by a guide member (not shown) so as to be slidable in the vertical direction. Instead of being conducted to the conducting body 9a via the connection fitting 10, The lower end of the conductor 9a is brought into contact with the upper end of the conductor 9a so that the conductor 9a is electrically connected.
Further, a guide roller 24 is provided in the vicinity of the upper end of the conducting body 9a. The wire 12f having one end fixed to the conducting body 9b is wound around the guide roller 24 and the other end is connected to the wire 5. It is connected. Further, the obturator 22 has a pair of wires 12f and 12f (only one is shown in the figure) that connects the vicinity of the lower end of the obturator 22 and the upper inner wall surface 7a of the hook opening / closing section body 7 via the tension coil spring 13. Is not applied).
Unlike the megaring filter grounding tool 1a of the first embodiment, the hook opening / closing portion main body 7 is not provided with the guide roller 14a and the guide hole 14b, and the wire insertion hole through which the wire 5 is inserted is a lower surface. Only provided.

In the grounding tool 1b for a mega ring filter having such a structure, when the knob 6 of the wire operation unit 3 is slid downward, the obturator 22 is pulled by the wire 5 and the tension coil spring 13 provided on the wire 12e. And the conductor 9b is pulled by the wire 12f and lowered. As a result, the opening 61b (see FIG. 5A) of the hook 61 closed by the obturator 22 is opened, and the conducting body 9a and the conducting body 9b are in contact with each other and are electrically connected. (See FIG. 5 (b)). As a result, the hook 61 is electrically connected to the cable 62 to which the ground metal fitting 64 is connected via the conductors 9a and 9b.
On the other hand, when the hand is released from the knob 6 of the wire operation unit 3 in this state, the obturator 22 is lifted by the tensile force of the tension coil spring 13 to close the opening 61b of the hook 61 and the conductive body 9b is lifted. The conductive state between the hook 61 and the grounding metal 64 is released away from the conductive body 9a.
That is, the conductors 9 a and 9 b function as a conduction unit that conducts the hook 61 to the grounding metal 64 via the cable 62.

As described above, in the grounding tool 1b for the mega ring filter, when the wire operation unit 3 is not operated, the opening 61b of the hook 61 is always closed by the closing tool 22, and the grounding terminal of the electric equipment is connected. Since there is no possibility that the hook 61 will come off without permission, the safety during operation is excellent.
In addition, the megaring filter grounding tool 1b is different from the megaring filter grounding tool 1a in that the mechanism for opening and closing the opening 61b of the hook 61 and the mechanism for making the hook 61 and the grounding metal 64 conductive and releasing the conductive state. Since it is realized by a simple structure, it can be manufactured at low cost.

6 (a) and 6 (b) show the external appearance of the megaring filter grounding tool of this embodiment, respectively. FIG. 6 (c) shows the megaring filter grounding tool in FIG. The state seen from the direction is shown. FIGS. 7A to 7C show the external appearance of the wire operation portion of the megaring filter grounding tool of this embodiment. Further, FIGS. 8A and 8B are enlarged views of the cross section taken along the line LL in FIG. 6A.
In FIGS. 8A and 8B, only the main body of the hook opening / closing portion and the guide member are hatched to indicate a cross section. Further, the components shown in FIGS. 4 and 5 are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIGS. 6 to 8, the megaring filter grounding tool 1 c of the present embodiment is the same as the megaring filter grounding tool 1 b of the second embodiment except that the wire operation section 25 is installed instead of the wire operation section 3. It is characterized by.
The wire operating unit 25 is installed on the front surface of the main body 26 so as to be rotatable about a hollow body 26 fixed to the insulating rod 60 by the fixing belt 25a and an axis orthogonal to the axial direction of the insulating rod 60. One end of the wire 5 is connected and a cylindrical insulator 27 provided with a knob 27a on the front surface, and the insulator 27 is integrated with the insulator 27 so as to be rotatable and installed inside the main body 26, and a protrusion 28a ( 7), and a guide member 29 that is installed on the front surface of the main body 26 and only allows the wire 5 to move in the vertical direction. The cable 62 is divided into an upper end 62 a and a lower end 62 b inside the main body 26. And the upper side edge part 62a is installed so that the conduction | electrical_connection body 28 may be contacted, and both are always a conduction | electrical_connection state. On the other hand, the lower end portion 62 b is installed so as to conduct with the conducting body 28 only when it comes into contact with the protruding portion 28 a that rotates together with the conducting body 28.
That is, in the megaring filter grounding tool 1 c, the wire operating unit 25 functions as an insulating unit that disconnects a part of the cable 62 and releases the conductive state between the hook 61 and the grounding metal 64.

  That is, in a state where the wire 5 is not wound by the insulator 27 (FIG. 7A or 7B), the upper end 62a and the lower end 62b of the cable 62 are not conductive. However, as indicated by an arrow M in FIG. 7B, when the operator grasps the knob 27a and rotates the insulator 27 clockwise, the wire 5 is wound around the side surface of the insulator 27. Therefore, the wire 5 moves downward (in the direction indicated by the arrow X). Then, when the insulator 27 is rotated until the state shown in FIG. 7C is reached, the projecting portion 28a comes into contact with the lower end portion 62b of the cable 62, and both are conducted. As a result, the upper end 62a and the lower end 62b of the cable 62 are electrically connected via the conductive body 28 and the protrusion 28a.

  As shown in FIGS. 8A and 8B, since the conducting member 9b is not installed in the megaring filter grounding tool 1c, neither the guide roller 24 nor the wire 12f is provided. Instead, the conductor 9a is in contact with the hook 61, and both are always in a conductive state. That is, in the megaring filter grounding tool 1 c, the conducting body 9 a functions as a conducting means for conducting the hook 61 to the grounding metal 64 via the cable 62.

As shown in FIG. 8A, when the opening 61 b of the hook 61 is closed by the closing tool 22, the hook 61 is not electrically connected to the grounding fitting 64 connected to the cable 62. However, when the knob 27a of the wire operation unit 25 is rotated clockwise, the obturator 22 is pulled down by the wire 5 and the opening 61b of the hook 61 closed by the obturator 22 is shown in FIG. ) As shown. At this time, as described above, since the upper end 62a and the lower end 62b of the cable 62 are in a conductive state, the hook 61 connects the conductor 9a and the cable 62 to the cable 62 to which the grounding metal fitting 64 is connected. Through an electrical connection.
Thus, according to the megaring filter grounding tool 1c, the mechanism for making the hook 61 and the grounding metal 64 conductive and releasing the conductive state is simpler than the case shown in the first or second embodiment. Since it is realized by the structure, the effect of reducing the manufacturing cost is further exhibited.

9 (a) and 9 (b) show the external appearance of the megaring filter grounding tool of this embodiment, respectively. FIG. 9 (c) shows the megaring filter grounding tool in FIG. 9 (a). The state seen from the direction is shown. Moreover, Fig.10 (a) and FIG.10 (b) have expanded and shown the state of the QQ arrow directional cross section in Fig.9 (a).
In FIGS. 10A and 10B, only the main body of the hook opening / closing portion and the guide member are hatched to indicate a cross section. Further, the components shown in FIGS. 4 to 8 are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIGS. 9 and 10, the megaring filter grounding tool 1 d according to the present embodiment is the same as the megaring filter grounding tool 1 c according to the third embodiment except that the wire operating portion 3 is installed in addition to the wire operating portion 25. In addition, instead of the obturator 22, an obturator 30 having a letter “I” shape in a side view is provided.
Since one end of the wire 5 is connected to the knob 6 and is not connected to the insulator 27 of the wire operation unit 25, the wire 5 does not move in the vertical direction even if the knob 27a of the wire operation unit 25 is rotated. . Further, as shown in FIGS. 10A and 10B, the conductor 9a is not installed in the grounding tool 1d for the mega ring filter, and the upper end of the cable 62 is connected to the lower end of the obturator 30. Are electrically connected. That is, in the megaring filter grounding tool 1d, the wire operating unit 25 is operated when the conductive state of the upper end 62a and the lower end 62b of the cable 62 is switched, and the wire 5 is moved up and down. The operation unit 3 is operated.

Therefore, as shown in FIG. 10A, when the knob 6 of the wire operation unit 3 is slid downward while the opening 61 b of the hook 61 is closed by the closing tool 22, the closing tool 30 becomes a wire. The opening 61b of the hook 61 pulled down by 5 and closed by the obturator 30 is opened as shown in FIG. 10 (b). However, in this state, the hook 61 and the grounding metal 64 are not conductive.
Therefore, when the knob 27a of the wire operation unit 25 is rotated clockwise so that the protrusion 28a of the conductive body 28 (see FIG. 7) contacts the lower end 62b of the cable 62, the upper end of the cable 62 is As a result of the conduction between the portion 62a and the lower end portion 62b, the hook 61 and the grounding metal 64 are brought into conduction. That is, in the grounding tool 1d for the mega ring filter, the obturator 30 functions as a conduction means for conducting the hook 61 to the grounding metal 64 via the cable 62, and the wire operation unit 25 cuts off a part of the cable 62 and It functions as an insulating means for releasing the conduction state between 61 and the grounding metal 64.
That is, in the megaring filter grounding tool 1d, the mechanism for opening and closing the opening 61b of the hook 61 and the mechanism for connecting the hook 61 and the grounding metal 64 and releasing the conductive state are realized by one simple structure. Therefore, the manufacturing cost can be further reduced.

  The grounding tool for a mega ring filter according to the present invention is not limited to the structure shown in the first to fourth embodiments. For example, in the megaring filter grounding tool 1a of the first embodiment, the obturator 22 shown in the second embodiment may be used instead of the obturator 8, and the conductors 9a and 9b may be connected via the connection fitting 10. Instead of conducting, as shown in the second embodiment, the conducting body 9b may be moved along the longitudinal direction of the insulating rod 60 and brought into contact with the conducting body 9b so that they can be conducted.

  The present invention can be used in the measurement work of insulation resistance using an insulation resistor.

  DESCRIPTION OF SYMBOLS 1a-1d ... Grounding tool for mega ring filters 2 ... Hook opening / closing part 2a ... Fixed belt 3 ... Wire operation part 3a ... Fixed belt 4 ... Main body 4a ... Guide hole 4b ... Cable insertion hole 5 ... Wire 6 ... Knob 7 ... Hook opening / closing Part main body 7a ... Upper inner wall surface 8 ... Obturator 8a ... Upper part 8b ... Lower part 8c ... Hinge 9a, 9b ... Conducting body 10 ... Connection fitting 10a ... Tip 11 ... Cylindrical body 12a-12f ... Wire 13 ... Tension coil spring 14a ... Guide Roller 14b ... Guide hole 15 ... Wire operating part 15a ... Fixing belt 16 ... Main body 16a ... Belt insertion hole 16b ... Opening part 16c ... Inner wall surface 17 ... Lever handle 17a ... Grip part 17b ... Wire fixing part 18 ... Compression coil spring 19 ... Shaft body 20a, 20b ... guide roller 21 ... fixing tool 22 ... occlusion tool 23 ... guy Guide member 25 ... Guide roller 25 ... Wire operation part 25a ... Fixed belt 26 ... Main body 27 ... Insulator 27a ... Knob 28 ... Conducting body 28a ... Projection part 29 ... Guide member 30 ... Obturator 50 ... Electrical equipment 51 ... Support insulator 52 ... frame 53 ... ground mounting pin 54 ... ground tool 55 ... insulating rods 56 ... hook 57 ... cable 58 ... grounding member 59 ... Mega ring filter 60 ... insulating rods 61 ... hook 61a ... tip 61b ... opening 62 ... cable 62a ... upper End 62b ... Lower end 63 ... Cable 64 ... Grounding metal fitting 65 ... Line terminal 66 ... Earth terminal 67 ... Insulation resistor 68 ... Line connection terminal 69 ... Earth connection terminal

Claims (7)

In the mega ring filter having a hook on the top of the insulating rod,
A hollow hook opening / closing part main body installed in the vicinity of a connection portion between the hook and the insulating rod,
A wire operating unit installed near the lower end of the insulating rod;
One end is connected to the wire operation unit and the wire is installed to be movable along the longitudinal direction of the insulating rod;
An obturator that is installed so as to be separable from the tip of the hook so as to close or open the opening of the hook and to which the other end of the wire is connected;
A conductive means that is electrically connected to the grounding metal via a cable and is detachably attached to the hook; and
The wire moves along the longitudinal direction of the insulating rod in accordance with the operation of the wire operation unit,
The obturator is installed in the hook opening / closing portion main body so that the opening of the hook can be switched from a closed state to an open state by being pulled by the wire,
The grounding tool for a mega ring filter, wherein the conducting means is installed on the hook opening / closing portion main body so that a part of the conducting means can come into contact with the hook by being pulled by the wire.   The obturator is pivotally held by the hook opening and closing portion so that the distal end side is rotated and can be separated from the distal end of the hook, and the hook is pulled by the wire. The grounding tool for a mega ring filter according to claim 1, wherein the grounding tool is installed so that the tip side rotates in a direction away from the tip.   The obturator moves along the longitudinal direction of the insulating rod and is held by the hook opening / closing portion so that the tip side can be separated from and attached to the tip of the hook, and the tip is pulled by the wire. The grounding tool for a mega ring filter according to claim 1, wherein the grounding tool is installed so as to move in a direction away from the tip of the hook.   The conducting means can move away from the hook by moving along the longitudinal direction of the insulating rod, and can move in a direction in which the portion in contact with the hook leaves when pulled by the wire. The grounding tool for a mega ring filter according to any one of claims 1 to 3, wherein the grounding tool is installed.   The conduction means is pivotally held at the base end side by the hook opening / closing portion so that the distal end side can be rotated and separated from the hook and pulled away from the hook by being pulled by the wire. The grounding tool for a megaring filter according to any one of claims 1 to 3, further comprising a connection fitting that is installed so that the tip end side is rotated.   Instead of being installed so as to be detachable from the hook, the conducting means is always placed in contact with the hook, disconnecting a part of the cable and reconnecting the disconnected part of the cable The grounding tool for a mega ring filter according to any one of claims 1 to 5, wherein an insulating means is installed in the cable as possible. The grounding for a mega ring filter according to any one of claims 1 to 6, further comprising a spring member that biases the obturator in a direction in which a distal end side thereof abuts on the distal end of the hook. tool.

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