JP2005033033A - Assembling method of lightning arrestor module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the assembling method of a lightning arrestor module the working efficiency of which is enhanced. <P>SOLUTION: In the assembling method of the lightning arrestor module 21, a current limiting element 1 with a nonlinear current voltage characteristic is sandwiched between a pair of metal fixtures 22, 23, and both ends of a plurality of insulating rods 25 arranged around the current limiting element 1 are fixed to the metal fixtures 22, 23. Grooves 24 are formed to an outer circumferential edge of each of the metal fixtures 22, 23, ends of the insulating rods 25 are fitted to the recessed grooves 24, a compressed weight is provided to the metal fixtures 22, 23 by depressing retaining tools 26 to opening circumferential parts from the outside of the opening circumferential parts of the recessed grooves 24, and provision of the compressed weight to the metal fixtures 22, 23 causes plastic deformation to the opening circumferential parts of the recessed grooves 24 to caulk the parts, thereby fixing the ends of the insulating rods 25. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for assembling a lightning arrester module, and more particularly to a method for assembling a lightning arrester module in which main components in a lightning arrester for protecting peripheral facilities of transmission and distribution lines from lightning surges and the like are unitized.

  Generally, when lightning strikes near high-voltage or extra high-voltage transmission and distribution lines, and when abnormal voltage occurs due to lightning surges, etc., the grounding side of the transmission and distribution lines is used to protect the peripheral equipment of the transmission and distribution lines from lightning surges. A lightning arrester is installed between the cable and the wire side. An example of the lightning arrester is shown in FIG.

  This lightning arrester has a structure in which a lightning arrester module 2 composed of a plurality of current limiting elements 1 is housed in an insulating insulator tube 3. The lightning arrester module 2 includes a plurality of current limiting elements 1 made of ZnO or the like having a non-linear current-voltage characteristic that exhibits a low resistance to surge voltage and a high resistance to a normal ground voltage of a transmission and distribution line, A pair of plate-like metal fittings 4 and 5 (hereinafter referred to as an upper metal fitting 4 and a lower metal fitting 5) are arranged coaxially at both ends of the current limiting element 1, and the current limiting element 1 is arranged with the upper metal fitting 4 and the lower metal fitting 5. It has a structure that is sandwiched between and unitized.

  In the lightning arrester module 2, as shown in FIGS. 9 and 10, insulating rods 6 are implanted at the four corners of the lower metal fitting 5, and holes 7 having a diameter larger than the insulating rod 6 are formed through the four corners of the upper metal fitting 4. ing. A plurality of current limiting elements 1 are placed and arranged on the lower metal fitting 5, and the upper metal fitting 4 is placed thereon. An insulating rod 6 is inserted into the hole 7 of the upper metal fitting 4 and a nut 9 is screwed into a male screw 8 formed at the tip of the insulating rod 6 to fasten and fix the current limiting element 1 and the upper metal fitting 4 and The lower metal fitting 5 is unitized (for example, refer patent document 1).

  The lightning arrester module 2 is accommodated in the cylindrical insulating rod 3 as described above. Specifically, the lower end opening of the soot tube 3 is hermetically sealed with the lower end plate 11, and the lower spacer 13 is disposed between the lower end plate 11 and the lower metal fitting 5 of the lightning arrester module 2. Further, the upper end opening of the soot tube 3 is hermetically sealed by the upper end plate 10, and the spring 14 and the upper spacer 12 are disposed between the upper end plate 10 and the upper metal fitting 4 of the lightning arrester module 2.

  The upper end plate 10, the lower end plate 11, the upper spacer 12 and the lower spacer 13 are all made of metal, and by applying a pressing force to the lightning arrester module 2 by the elastic force of the spring 14, A reliable electrical connection state is obtained by pressing the upper metal fitting 4, the current limiting element 1 and the lower metal fitting 5, and the lower spacer 13 of the lightning arrester module 2 with a predetermined pressurizing force. Although not shown, the upper end plate 10 is provided with, for example, an upper terminal electrode on the electric wire side, and the lower end plate 11 is provided with, for example, a lower terminal electrode on the ground side.

In this lightning arrester, when an abnormal voltage due to a lightning surge or the like is generated, the current limiting element 1 has a low resistance and instantaneously escapes to the ground. When the abnormal voltage disappears, the current limiting element 1 becomes a high resistance. Cut off the normal ground voltage. This valve action protects the peripheral equipment of the transmission and distribution lines from lightning surges and the like.
Japanese Patent Laid-Open No. 5-13142

  By the way, in the conventional lightning arrester, as described above, the lightning arrester module 2 in which a plurality of the current limiting elements 1 are sandwiched between the upper metal fitting 4 and the lower metal fitting 5 and nut-fixed via the insulating rod 6 is used. For this reason, in assembling the lightning arrester module 2, the nuts 9 must be screwed into the male screws 8 formed at the tips of the plurality of insulating rods 6 and fastened, which has a problem in work efficiency. In order to solve this problem, a structure has been proposed in which a constricted portion is provided at the end of the insulating rod, and a retaining ring is attached to the constricted portion to eliminate the need for screwing (Japanese Patent Laid-Open No. 2002-270405). . According to this structure, it is necessary to process the member, to handle the member in place of the nut, and to attach the member, and there is a limit to improving the working efficiency.

  Therefore, the present invention has been proposed in view of the above problems, and an object of the present invention is to provide a method of assembling a lightning arrester module that can improve the work efficiency in assembling the lightning arrester module in the lightning arrester. is there.

As a technical means for achieving the above object, the present invention provides a plurality of insulating elements arranged around a current limiting element by sandwiching a current limiting element having a non-linear current-voltage characteristic between a pair of metal fittings. The assembling method of the lightning arrester module for fixing both ends of the rod to the metal fitting is characterized by the following methods A to C.
A A concave groove is formed in the outer peripheral edge of the metal fitting, the end of the insulating rod is fitted into the concave groove, and the opening peripheral edge of the concave groove is crimped by plastic deformation by applying a compressive load to the metal fitting. To fix the end of the insulation rod. Here, the application of the compressive load to the metal fitting is realized by pressing a pressing jig against the opening peripheral edge from the outside of the opening peripheral edge of the concave groove.
B. A groove is formed in the outer peripheral edge of the metal fitting, and an end of the insulating rod is fitted into the groove, and then a pressing member for pressing the end of the insulating rod is press-fitted into the groove. The method of fixing the end of the.
C A method of forming a groove on the outer peripheral edge of the metal fitting, winding a sheet-like member around the end of the insulating rod, and press-fitting the end of the insulating rod into the groove.

  In the present invention, according to the above-described methods A to C, the operation of sandwiching the current limiting element between the upper metal fitting and the lower metal fitting and fastening the nut through the insulating rod as in the prior art becomes unnecessary, and the assembly of the lightning arrester module is simplified. Therefore, the work efficiency can be easily improved and the number of parts can be reduced.

  According to the present invention, a groove is formed in the outer peripheral edge of the A metal fitting, the end of the insulating rod is fitted into the groove, and the opening peripheral edge of the groove is plastically deformed by applying a compressive load to the metal fitting. Clamping the end of the insulating rod by caulking, forming a concave groove on the outer peripheral edge of the B metal fitting, inserting the end of the insulating rod into the concave groove, and pressing the end of the insulating rod A method of fixing the end of the insulating rod by press-fitting the member, forming a concave groove on the outer peripheral edge of the C metal fitting, winding a sheet-like member around the end of the insulating rod, and press-fitting the end of the insulating rod into the concave groove In any of the methods of securing the lightning arrester module, it is not necessary to sandwich a plurality of current limiting elements between the upper and lower brackets and fasten the nuts with the insulating rods as in the conventional case, and the assembly of the lightning arrester module is simplified. Thus, the work efficiency can be easily improved and the number of parts can be reduced.

  An embodiment of a method for assembling a lightning arrester module according to the present invention will be described in detail below. The same parts as those in FIGS. 9 to 11 are denoted by the same reference numerals.

  The lightning arrester of the embodiment shown in FIG. 2 has a structure in which a lightning arrester module 21 composed of a plurality of current limiting elements 1 is housed in an insulating soot tube 3. The lightning arrester module 21 includes a plurality of current limiting elements 1 made of ZnO or the like having a non-linear current-voltage characteristic that exhibits low resistance to surge voltage and high resistance to a normal ground voltage of a transmission and distribution line, A pair of cylindrical metal fittings 22 and 23 (hereinafter referred to as upper metal fitting 22 and lower metal fitting 23) are coaxially arranged at both ends of these current limiting elements 1, and current limiting element 1 is arranged between upper metal fitting 22 and lower metal fitting 23. It has a structure that is sandwiched between and unitized. In addition, the shape of the upper metal fitting 22 and the lower metal fitting 23 is not limited to a cylindrical shape, and may be other shapes including a prismatic shape.

  In the lightning arrester module 21, as shown in FIGS. 1A and 1B, a plurality of concave grooves 24 are formed at equal intervals in the opposing surface portions of the side surfaces of the upper metal fitting 22 and the lower metal fitting 23. The plurality of concave grooves 24 have a corresponding positional relationship between the upper metal fitting 22 and the lower metal fitting 23. The size of each concave groove 24 may be such that the end portion of the insulating rod 25 can be fitted therein. For example, the width dimension and the depth dimension of the concave groove 24 are approximately the same as the outer diameter of the end portion of the insulating rod 25. It is set above.

  The assembly of the lightning arrester module 21 in this embodiment is performed as follows. First, a plurality of current limiting elements 1 are placed and arranged on the lower metal fitting 23, and the upper metal fitting 22 is further placed thereon. At this time, the upper metal fitting 22, the plurality of current limiting elements 1 and the lower metal fitting 23 are arranged coaxially, and the corresponding concave grooves 24 of the upper metal fitting 22 and the lower metal fitting 23 are positioned on the same straight line parallel to the axial direction. Are arranged as follows. The upper metal fitting 22, the plurality of current limiting elements 1 and the lower metal fitting 23 are held in a posture by a chuck jig (not shown) in a state where a pressing force is applied from above and below along the arrangement direction. In this state, as shown in FIGS. 3 (a) and 3 (b), the end portions of the insulating rod 25 are fitted into the corresponding concave grooves 24 of the upper metal fitting 22 and the lower metal fitting 23, respectively.

  In this embodiment, as shown in FIGS. 4 (a) and 4 (b), the end of the insulating rod 25 is fitted into the concave groove 24 of the upper metal fitting 22 and the lower metal fitting 23, and is recessed by the holding jig 26 from the outside. A compression load is applied to the opening peripheral edge of the groove 24, and the opening peripheral edge of the concave groove 24 is caulked by plastic deformation by the compression load. By this caulking, the peripheral edge of the opening of the concave groove 24 is deformed so as to surround the end of the insulating rod 25, and the end of the insulating rod 25 is fixed (see FIG. 1B). The end of the insulating rod 25 is fixed simultaneously to all the concave grooves 24 formed at equal circumferential positions on the outer peripheral edge of both the upper metal fitting 22 and the lower metal fitting 23.

  As described above, the lightning arrester module 21 in which the plurality of current limiting elements 1 are sandwiched between the upper metal fitting 22 and the lower metal fitting 23 and unitized via the insulating rod 25 is manufactured. The lightning arrester module 21 manufactured in this manner can be obtained by releasing the pressing force applied to the upper metal fitting 22 and the lower metal fitting 23 from the state in which the posture is held by the aforementioned chuck jig (not shown). Tensile force acts on the insulating rod 25 fixed between the lower metal fitting 22 and the lower metal fitting 23, and between the upper metal fitting 22 and the current limiting element 1, between the current limiting elements 1, and the current limiting element 1 and the lower metal fitting 23. A good adhesion state can be obtained, and mechanical joining and electrical connection are ensured.

  The lightning arrester module 21 is accommodated in the cylindrical insulating insulator tube 3 as described above. Specifically, the lower end opening of the soot tube 3 is hermetically sealed with the lower end plate 11, and the lower metal fitting 23 of the lightning arrester module 21 is placed on the lower end plate 11. Further, the upper end opening of the soot tube 3 is hermetically sealed with the upper end plate 10, and the spring 14 is disposed between the upper end plate 10 and the upper metal fitting 22 of the lightning arrester module 21.

  The lightning arrester module 21 is pressed against the lower end plate 11 by the elastic force of the spring 14, and the upper end plate 10 and the spring 14, the spring 14 and the upper metal fitting 22 of the lightning arrester module 21, and the lower metal fitting 23 and the lower part of the lightning arrester module 21. The end plate 11 is in close contact and is electrically connected.

  Although not shown, an upper terminal electrode is mounted on the upper end plate 10, and a lower terminal electrode is mounted on the lower end plate 11, respectively. The upper terminal electrode or the lower terminal plate can be used as the upper end plate 10 or the lower end plate 11 by being integrally formed with the upper end plate 10 or the lower end plate 11.

  In this lightning arrester, when an abnormal voltage due to a lightning surge or the like is generated, the current limiting element 1 has a low resistance and instantaneously escapes to the ground. When the abnormal voltage disappears, the current limiting element 1 becomes a high resistance. The normal ground voltage is substantially cut off. This valve action protects the peripheral equipment of the transmission and distribution lines from lightning surges and the like.

  In the above-described embodiment, the end of the insulating rod 25 is fitted into the concave groove 24 of the upper metal fitting 22 and the lower metal fitting 23, and the opening peripheral edge portion of the concave groove 24 is caulked with the holding jig 26 by plastic deformation. However, the present invention is not limited to this, and other embodiments described below may be used.

  As shown in FIGS. 5 (a) and 5 (b), the end of the insulating rod 25 is fitted into the recessed grooves 24 of the upper metal fitting 22 and the lower metal fitting 23, and then shown in FIGS. 6 (a) and 6 (b). Thus, the end of the insulating rod 25 may be fixed by press-fitting the holding member 27 for pressing the end of the insulating rod 25 into the concave groove 24. In this case, the depth of the recessed groove 24 may be set so that the presser member 27 press-fitted into the recessed groove 24 does not protrude from the outer peripheral surfaces of the upper metal member 22 and the lower metal member 23. The width dimension of the pressing member 27 is set slightly larger than the width dimension of the concave groove 24 so that the pressing member 27 can be press-fitted. Further, the surface of the pressing member 27 that comes into contact with the insulating rod 25 is a concave curved surface that matches the outer diameter surface of the insulating rod 25.

  Further, as in the embodiment shown in FIGS. 7A and 7B, a sheet-like member such as a copper plate 28 is wound around and fixed to the end of the insulating rod 25. In this way, the outer diameter of the end portion of the insulating rod 25 becomes larger than the width dimension of the concave groove 24. Therefore, the end portion of the insulating rod 25 is connected to the upper metal fitting 22 as shown in FIGS. And it can be press-fitted and fixed in the concave groove 24 of the lower metal fitting 23.

  In each of the embodiments described above, a plurality of current limiting elements 1 are incorporated. However, a case where a single current limiting element is incorporated is also applicable. In these embodiments, the lightning arrester module 21 is housed in a soot tube 3 that is an insulating container. However, the lightning arrester module 21 is made of, for example, an elastic polymer such as epoxy resin, silicone rubber, or ethylene-propylene copolymer. The present invention can also be applied to a structure molded with an insulating jacket made of an insulating material such as a combined body (EPDM).

(A) is embodiment of this invention, and is a perspective view which shows a lightning arrester module, (b) is a cross-sectional view which follows the AA line of (a). It is a longitudinal cross-sectional view which shows the lightning arrester which accommodated the lightning arrester module of FIG. 1 in the soot pipe. In the embodiment of the present invention, in assembling the lightning arrester module, a method for fixing the end portion of the insulating rod to the concave groove of the metal fitting by a pressing jig is shown. (A) is for inserting the insulating rod into the concave groove. The longitudinal cross-sectional view which shows a previous state, (b) is a cross-sectional view which follows the BB line of (a). In the embodiment of the present invention, in assembling the lightning arrester module, a method for fixing the end of the insulating rod to the concave groove of the metal fitting by a pressing jig is shown. (A) is a diagram showing that the insulating rod is inserted into the concave groove. The longitudinal cross-sectional view which shows a back state, (b) is a cross-sectional view which follows the CC line of (a). In another embodiment of the present invention, in assembling a lightning arrester module, a method for fixing an end of an insulating rod to a concave groove of a metal fitting by a pressing member is shown. (A) pushes the pressing member into the concave groove. The longitudinal cross-sectional view which shows a previous state, (b) is a cross-sectional view which follows the DD line | wire of (a). In another embodiment of the present invention, in assembling a lightning arrester module, a method for fixing an end of an insulating rod to a concave groove of a metal fitting by a pressing member is shown. (A) pushes the pressing member into the concave groove. The longitudinal cross-sectional view which shows a state after the last, (b) is a cross-sectional view which follows the EE line | wire of (a). In another embodiment of the present invention, in assembling a lightning arrester module, a method for fixing an end portion of an insulating rod to a concave groove of a metal fitting with a sheet-like member is described. The longitudinal cross-sectional view which shows the state before inserting, (b) is a cross-sectional view which follows the FF line of (a). In another embodiment of the present invention, in assembling a lightning arrester module, a method for fixing an end portion of an insulating rod to a concave groove of a metal fitting with a sheet-like member is described. The longitudinal cross-sectional view which shows the state after inserting, (b) is a cross-sectional view which follows the GG line of (a). It is a perspective view which shows the conventional lightning arrester module. It is an assembly exploded front view for demonstrating the point to assemble the lightning arrester module of FIG. It is a longitudinal cross-sectional view which shows the lightning arrester which accommodated the lightning arrester module of FIG. 9 in the soot pipe.

Explanation of symbols

1 Current limiting element 21 Lightning arrester module 22 Metal fitting (upper metal fitting)
23 bracket (lower bracket)
24 concave groove 25 insulating rod 26 holding jig 27 holding member 28 sheet-like member (copper plate)

Claims (4)

  In a method of assembling a lightning arrester module in which a current limiting element having non-linear current-voltage characteristics is sandwiched between a pair of metal fittings and both ends of a plurality of insulating rods arranged around the current limiting element are fixed to the metal fittings. A concave groove is formed in the outer peripheral edge of the metal fitting, the end of the insulating rod is fitted into the concave groove, and the opening peripheral edge of the concave groove is caulked by plastic deformation by applying a compressive load to the metal fitting for insulation. A method of assembling a lightning arrester module, comprising fixing an end of a rod.   2. The lightning arrester module according to claim 1, wherein a compressive load is applied by a pressing jig from an outer side of an opening peripheral edge of the concave groove in a state in which an end portion of the insulating rod is fitted in the concave groove of the metal fitting. Assembly method.   In a method of assembling a lightning arrester module in which a current limiting element having non-linear current-voltage characteristics is sandwiched between a pair of metal fittings and both ends of a plurality of insulating rods arranged around the current limiting element are fixed to the metal fittings. A concave groove is formed in the outer peripheral edge of the metal fitting, and an end of the insulating rod is fitted into the concave groove, and then a pressing member for pressing the end of the insulating rod is pressed into the concave groove to An assembling method of a lightning arrester module characterized by fixing an end portion. In a method of assembling a lightning arrester module in which a current limiting element having non-linear current-voltage characteristics is sandwiched between a pair of metal fittings and both ends of a plurality of insulating rods arranged around the current limiting element are fixed to the metal fittings. A lightning arrester module characterized in that a concave groove is formed in an outer peripheral edge of the metal fitting, and a sheet-like member is wound around an end of the insulating rod, and the end of the insulating rod is press-fitted into the concave groove and fixed. Assembly method.