JP5394437B2 - How to exchange the insulators - Google Patents

Description

  The present invention relates to an insulator replacement method for an insulator for exchanging a first insulator on the ground side among insulators attached to a steel tower arm by a power transmission line and supporting the power transmission line.

  In the transmission line, the transmission line is supported by an insulator series attached to the steel tower arm. In such insulator series, the steel tower mounting side is called the ground side, and the transmission line support side is called the line side. Depending on the scale of the transmission line, the insulator series is arranged with a large number of insulators ranging from about 20 to 50 in a 500 kV line, for example. The individual insulators are arranged in series by connecting a cap fitting fixed to the head of the insulator to a pin fitting provided at the bottom of the insulator main body.

  The individual lions that make up the lion chain deteriorate with age. It will deteriorate over time. A defective insulator that has deteriorated over time needs to be replaced. If the number of defective insulators found is about several, it is common to replace the defective insulators using a hydraulic insulator exchanger. Such an insulator exchanger and a method for replacing a defective insulator using the insulator exchanger are described in, for example, Patent Document 1 (see Paragraphs 0003 to 0004 of Patent Document 1).

  In order to replace a defective insulator using an insulator exchanger, first, a cap gripping part for insulator replacement (referred to as “insulator replacement gripper” in Cited Reference 1) is placed between a pair of healthy insulator caps sandwiching the defective insulator. ). These cap gripping portions are connected at both ends by a pair of connecting cranks. Therefore, the connecting crank is operated by the hydraulic ram, and the pair of cap gripping portions are pulled in directions close to each other. Then, since the space | interval between cap holding parts is narrowed and the tension | tensile_strength added to a defective insulator is removed, the replacement | exchange is attained.

Japanese Patent Laid-Open No. 05-041124 JP 2000-059936 A

  The defective insulator replacement method using the insulator exchanger described in Patent Document 1 is an excellent method in that the defective insulator can be replaced relatively easily. However, the insulator exchanger has a structure in which the cap gripping parts are attached to the healthy insulator cap fittings located on both sides of the defective insulator, and the first insulator located at the end of the insulator series is grounded. This cannot be exchanged either on the side or on the line side. For this reason, to replace the first insulator, conventionally, a large-scale operation has been performed in which the transmission line supported by the insulator series is pulled with a winch to remove the tension of the entire insulator series.

  On the other hand, in Patent Document 2, a ground-side yoke and a line-side yoke provided at both ends of an insulator series are connected by a telescopic link rod, and a hydraulically driven piston / cylinder is connected to the link rod. The invention has been described in which a hydraulic telescopic device and a turnbuckle connected in series are connected (see paragraphs 0015 to 0017 of Patent Document 2). By operating the hydraulic telescopic device to shorten the overall length of the link rod, the tension applied to the lever in the entire row of levers can be removed, and the desired lever can be replaced. Of course, the first lion is no exception. By adopting such a method, at least a large-scale work such as pulling the power transmission line with a winch is unnecessary, and the first insulator can be replaced relatively easily.

  However, the apparatus described in Patent Document 2 is approximately different in structure from a general insulator exchanger as described in Patent Document 1. In addition, it is assumed that the entire apparatus will be relatively large because the tension applied to the insulators is removed all at once for the entire row of insulators. If you can, you don't want to use such a special instrument.

  The present invention has been made in view of such a point, while using a general insulator exchanger that attaches a pair of cap gripping portions to the cap metal fittings of two insulators and brings these cap gripping portions close to each other, The purpose of the present invention is to make it possible to replace the first insulator on the earth side of the Isogo Reed relatively easily.

According to the lever replacement method of the lever series of the present invention, a pair of connecting cranks that extend and contract by applying an external force to both ends of a pair of cap gripping tools that are detachably attached to a plurality of lever cap fittings provided in the lever series. A step of removing one of the cap grippers from the insulator exchanger connected in step 1 and making the one end side of the connecting crank consisting of the pair of single links a free end, and the other not removed from the insulator exchanger A mounting step of mounting the cap gripping tool on the cap cap of the insulator on the line side with respect to the first insulator on the ground side provided in the insulator series, and each of the free ends of the pair of connecting cranks, A connecting step of connecting and fixing to a member on the ground side from the first insulator on the ground side via a pair of connecting metal fittings, and contracting the pair of connecting cranks by applying an external force; Comprising a抜力step of removing the tensile force applied to one sheet of insulator over the scan side and, in the connecting step, the ground-side yoke attaching the first sheet of insulator cap fitting of the ground side, one of the A plate-like member provided on the tower arm located on the opposite side of the earth side yoke by inserting the insulator series attached with the cap gripping tool, as a member on the earth side for connecting and fixing a connecting metal fitting, The above-mentioned problem is solved by using the other connecting fitting as a member on the ground side for connecting and fixing .

  According to the present invention, since the connecting crank of the insulator exchanger from which one cap gripper is removed is connected and fixed to the member on the side of the steel tower arm via the pair of connecting fittings, the general insulator exchanger is used. However, the first insulator on the ground side provided in the insulator series can be replaced relatively easily. Therefore, when exchanging the first insulator on the ground side, it is used for facilitating the replacement and for the replacement. Various effects can be produced, such as miniaturization of devices and suppression of diversification of devices used for replacement work.

As an embodiment, an example of a double tension tensile insulator attached to a tower arm is shown, (a) is a plan view showing a state during normal use, and (b) is a replacement of the first insulator on the ground side The top view which shows a procedure. The front view which shows an example of an insulator exchanger. The top view of the insulator exchanger shown in FIG. The front view which shows an example of a connection metal fitting. The top view of the coupling metal fitting shown in FIG.

  An embodiment will be described with reference to the drawings.

≪Overview≫
As shown in FIG. 1 (a), an insulator series 21 for supporting a power transmission line (not shown) is attached to a steel tower arm 11 of a steel tower (none of which is shown) placed on the power transmission line. Yes. The insulator series 21 is a double tension tension insulator in which a plurality of insulators 23 are arranged in two rows between the earth side yoke 22a and the line side yoke 22b, and the earth side yoke 22a is attached to the mounting piece 12 of the tower arm 11. And the transmission line is supported by the line side yoke 22b. The insulator 23 has a cap fitting 23a fixed to the head and a pin fitting (not shown) at the bottom. If the cap metal fitting 23a is attached to the pin metal fitting of the adjacent insulator 23, the plurality of insulators 23 are connected in series.

  The present embodiment provides a method for exchanging the first insulator 23E on the ground side of the insulator series 21. For this purpose, a conventional insulator exchanger 31 and a pair of connecting fittings 101 (101S, 101L) are used (see FIG. 1B). Hereinafter, after describing the insulator exchanger 31 and the pair of connecting fittings 101, a method for exchanging the first insulator 23E on the ground side will be introduced.

≪Insulator exchanger≫
As shown in FIGS. 2 and 3, the insulator exchanger 31 includes a pair of couplings that extend and contract by applying external force to both ends of a pair of cap grippers 32 that are detachably attached to the cap fitting 23a of the insulator 23. They are connected by a crank 33. The connecting crank 33 is a structure in which a pair of connecting bodies 34 and a pair of pressure receiving bodies 35 are connected by four connecting rods 36 so as to form a pantograph structure.

  The center portion of the cap gripping tool 32 is formed in an annular shape, and the annular portion is attached to the cap fitting 23a so as to surround the cap fitting 23a of the insulator 23. The annularly formed portion of the cap gripper 32 is divided into two parts, one of which is rotatably attached to the other about the axis A, and the part opposite to the axis A can be fixed with a wing nut WN. . When attaching to and detaching from the cap fitting 23a, the wing nut WN is loosened to open one of the two annular portions.

  The coupling body 34 has two pieces facing each other to form a gap G1 therebetween, and the flat end of the cap gripping tool 32 is positioned in the gap G1, and the cap gripping tool 32 is connected by the cotter pin CP in this state. ing. The cotter pin CP passes through an attachment hole H formed in the connecting body 34 and the end of the cap gripping tool 32, and is prevented from being detached in this state, so that the cap gripping tool 32 is rotatably connected to the connecting body 34. To do.

  The connecting arm 34a is projected from the connecting body 34 and the front and back surfaces thereof. The connecting rod 36 is rotatably connected to the connecting arm 34a of the connecting body 34 and the pressure receiving body 35 by a connecting pin AP. Therefore, as the pair of pressure receiving bodies 35 approaches and separates, the pair of connecting bodies 34 also approaches and separates, and according to this, the pair of cap grippers 32 also approaches and separates and changes the facing interval. Therefore, the insulator exchanger 31 is configured such that a hydraulic ram 37 is interposed between the pair of pressure receiving bodies 35 and the hydraulic ram 37 is operated so that the facing distance between the pair of cap gripping tools 32 can be controlled.

≪Connecting bracket≫
As shown in FIGS. 4 and 5, the connection fitting 101 has a flat plate shape at one end, and two pieces are opposed to each other at the other end to form a gap G <b> 2 therebetween, and a plurality of mounting holes H are formed at both ends thereof. Is forming. These mounting holes H are arranged along the length direction of the connection fitting 101.

  One end side of the connecting metal fitting 101 formed in a flat plate shape is formed with a thickness inserted into the gap G1 formed by the connecting body 34 of the insulator exchanger 31, and can be freely rotated by the cotter pin CP while being inserted into the gap G1. It can be stopped. The cotter pin CP passes through the mounting hole H formed in the connecting body 34 and one mounting hole H provided on one end side formed in a flat plate shape of the connecting fitting 101, and is prevented from being detached in this state. , Both are rotatably connected. At this time, the extension length of the connection fitting 101 from the connection fitting 101 can be adjusted by selecting the position of the attachment hole H connected to the connection body 34.

  The gap G <b> 2 formed on the other end side of the connecting metal fitting 101 is set to an interval at which the attachment piece 13 of the tower arm 11 can be inserted. The other end side of the connection fitting 101 is rotatably fixed to the attachment piece 13 of the steel tower arm 11 inserted into the gap G2 by the cotter pin CP (see FIG. 1B). The cotter pin CP passes through the mounting hole H formed in the mounting piece 13 and one mounting hole H provided on the other end side of the coupling metal 101, and is prevented from coming off in this state, so that both can be freely rotated. Connect to At this time, in the connection fitting 101, the attachment hole H that allows the cotter pin CP to pass through can be selected in accordance with the position of the attachment hole H formed in the attachment piece 13 of the tower arm 11.

≪How to replace insulators≫
The method for exchanging the first insulator 23E on the ground side is executed by a preparation process, a mounting process, a connecting process, and a extracting process. Hereinafter, each process is demonstrated based on FIG. 1 thru | or FIG.

(1) Preparatory Step In the preparatory step, one cap gripper 32 is removed from the insulator exchanger 31 and one end side of the pair of connecting cranks 33 is set as a free end FE.

(2) Mounting Step In the mounting step, the other cap gripper 32 that has not been removed from the lever exchanger 31 is mounted on the cap fitting 23a of the lever 23 on the line side with respect to the first lever 23E on the ground side.

(3) Connection process Each free end FE of the pair of connection cranks 33 is connected and fixed to a member on the ground side with respect to the first insulator 23E on the ground side through the pair of connection fittings 101. In the present embodiment, as the “earth side member”, the earth side yoke 22 a of the insulator series 21 and the attachment piece 13 provided on the tower arm 11 are used. A short connecting metal 101S is used for the ground side yoke 22a, and a long connecting metal 101L is used for the mounting piece 13, and the free ends FE of the pair of connecting cranks 33 are connected and fixed. doing.

  At this time, the connecting metal fitting 101 has a plurality of both the connecting side to the free end FE of the pair of connecting cranks 33 and the connecting side to the earth side yoke 22a and the mounting piece 13 which are “earth side members”. A mounting hole H is provided. Therefore, an attachment hole H that allows the cotter pin CP to pass through is appropriately selected from the attachment holes H in accordance with the separation distance between the free ends FE of the pair of connecting cranks 33 and the “earth side member”.

  Note that either the mounting step or the connecting step may be executed first, and it does not matter before and after time.

(4) Pulling-out process The hydraulic ram 37 is operated to apply an external force to the pair of connecting cranks 33 to contract the connecting cranks 33. “Shrinking” the connecting crank 33 means that the hydraulic ram 37 is operated to separate the pair of pressure receiving bodies 35, and as a result, the pair of connecting bodies 34 are brought close to each other. As a result of the contraction of the connecting crank 33, the insulator chain 21 connected with the pin fitting (not shown) to the cap fitting 23a held by the cap holder 32 of the insulator exchanger 31 is pulled toward the tower arm 11 side (ground side). Thus, the pulling force applied to the first insulator 23E on the ground side is removed. Therefore, the first insulator 23E on the ground side can be replaced.

<Effect>
As described above, according to the present embodiment, the pair of connecting cranks 33 of the insulator exchanger 31 from which one cap gripping tool 32 is removed are connected to the ground side via the pair of connecting fittings 101 (101S, 101L). Since this is connected and fixed to the member (earth side yoke 22a), the first ground side insulator 23E provided in the insulator series 21 can be replaced relatively easily while using a general insulator exchanger 31. . Thereby, when exchanging the first insulator 23E on the ground side, various effects such as easy exchange work, downsizing of the equipment used for the exchange work, and suppression of diversification of the equipment used for the exchange work are produced. be able to.

  In the connecting step, one connecting fitting 101S is connected and fixed to the earth side yoke 22a of the insulator series 21, and the other connecting fitting 101L is connected to the mounting piece 13 which is a flat plate member provided on the tower arm 11. It is fixed. Thereby, it becomes possible to set the connection metal fitting 101 using the existing product. In addition, the center of the cap fitting 23a, the earth side yoke 22a, and the mounting piece 13 held by the one cap holding tool 32 remaining in the insulator exchanger 31 are positioned in substantially the same plane, so that strange twisting occurs. The connecting fitting 101 can be set in a well-balanced manner.

  Further, the connecting fitting 101 (101S, 101L) is rotatably connected and fixed to the earth side yoke 22a and the mounting piece 13 which are “earth side members”, and the free ends FE of the pair of connecting cranks 33 are connected to each other. Depending on the separation distance between the earth side yoke 22a, which is the “earth side member”, and the mounting piece 13, the connection position with these members is varied by a plurality of mounting holes H. These configurations also contribute to setting the connecting fitting 101 in a well-balanced manner without causing strange twisting.

≪Modification≫
Although the present embodiment has been described above, various modifications and changes are allowed in implementation.

  For example, in the present embodiment, as the “earth side member”, the earth side yoke 22 a of the insulator series 21 and the attachment piece 13 provided on the tower arm 11 are used. That is, one of the free ends FE of the pair of connecting cranks 33 included in the insulator exchanger 31 is connected to the ground side yoke 22a via the connecting fitting 101S, and the other is connected to the mounting piece 13 via the connecting fitting 101L. doing. On the other hand, in implementation, as long as it is a member on the ground side with respect to the first insulator 23E on the ground side, other members can be used as the “earth side member”. For example, another member provided on the tower arm 11 can be used, or any of the free ends FE of the pair of connecting cranks 33 can be connected to the ground side yoke 22a or connected to the mounting piece 13. It is also possible. What is to be “earthed member” may be determined on a case-by-case basis.

  Further, in the present embodiment, an example in which the expansion and contraction of the pair of connecting cranks 33 is controlled using the hydraulic ram 37 has been described. For example, the expansion and contraction of the pair of connecting cranks 33 may be controlled using a turnbuckle.

11 Steel tower arm
22a Earth side yoke 13 Mounting piece (a flat member provided on the steel tower arm)
21 Insulator series 23 Insulator 23a Cap metal fitting 23E First insulator 31 on the earth side Insulator exchanger 32 Cap gripper 33 Coupling crank 101 Coupling metal fitting CP CP cotter pin (pin)
FE Free end

Claims (6)

From a lever exchanger in which both ends of a pair of cap gripping tools that are detachably mounted on a plurality of lever cap fittings provided in the lever series are connected by a pair of connecting cranks that expand and contract when external force is applied. A preparation step of removing the cap gripping tool and setting one end side of the pair of connecting cranks as a free end;
A mounting step of mounting the other cap gripping tool that has not been removed from the lever exchanger on the cap metal fitting of the lever on the line side from the first lever on the ground side provided in the lever series;
A connecting step of connecting and fixing each of the free ends of the pair of connecting cranks to a member on the ground side rather than the first insulator on the ground side via a connecting metal fitting made of a pair of single links ;
A pulling-out step of applying an external force to contract the pair of connecting cranks and removing a pulling force applied to the first insulator on the ground side;
Equipped with a,
In the connecting step, the earth side yoke for attaching the cap member of the first insulator on the ground side is used as a member on the earth side for connecting and fixing one of the connecting members, and the insulator equipped with the cap gripping tool is used. A plate-like member provided on the steel tower arm located on the opposite side of the earth side yoke with a series in between is used as the earth side member for connecting and fixing the other connecting fitting.
A method of exchanging insulators of the Choshiren characterized by the above. The method for exchanging levers according to claim 1 , wherein the connecting bracket is rotatably connected and fixed to a member on the ground side. 2. The lever replacement method according to claim 1 , wherein the connecting metal fitting is connected and fixed to the ground side yoke by penetrating a pin in a state where the ground side yoke is sandwiched from the front and back surfaces thereof. The connecting fitting, wherein the plate-like member provided in the tower arm in claim 1 in which the pins in a state sandwiched from front and rear surfaces by penetrating coupling fixed to the flat-plate-like member, it is characterized by How to exchange lions The pair of connecting brackets vary a connecting position between the free ends of the pair of connecting cranks in accordance with a separation distance between the free ends of the pair of connecting cranks and the ground side member. The method for exchanging insulators of the insulator series according to any one of claims 1 to 4 . The pair of connection fittings may vary a connection position between the pair of connection cranks and the ground side member according to a separation distance between a free end of the pair of connection cranks and the ground side member. Item 5. A method for exchanging insulators according to any one of Items 1 to 4 .

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