JP4878058B2 - Triple tension insulator with lightning arrester - Google Patents

Description

  The present invention relates to a triple tension insulator device with a lightning arrester mainly used for a transmission line.

  Various insulator devices are conventionally used to insulate and support a transmission line on a steel tower. When the tensile load borne by the insulator device is large, a double tension insulator device as shown in Patent Document 1 A triple tension insulator device is used. Also, in order to prevent lightning accidents on the transmission line due to flashover of the lever device when lightning strikes on the transmission line, it is also widely practiced to install a lightning arrester on the lever device.

  In this lightning arrester, zinc oxide elements having non-linear voltage-current characteristics that are high resistance to the operating voltage of the system but low resistance to lightning surge overvoltage are arranged in series inside the container. The outside is covered with a jacket and a discharge electrode is attached to the tip. Current does not flow at all times, but during lightning strikes, the voltage-current characteristics of the zinc oxide element are used to suppress the voltage generated in the insulator device, and the continuity is cut off in a short time, thus preventing a transmission line accident. . This lightning arrester is, for example, a large device having a length of 1 m or more and a weight of several tens of kg for a 275 kV transmission line.

  On the other hand, in the two-strand tension insulator device and the three-strand tension insulator device, a flat plate in which both the ground side and the charging side are called yokes is used to equally apply the tensile load to each of the two or three insulators. It is supported by a metal fitting. FIG. 1 is a plan view of a two-stretch tension insulator device, in which two insulator trains 1 are supported in parallel by a grounding-side double yoke 2 and a power-applying side double yoke 3. Each yoke is provided with link attachment holes 4 at both ends, and the insulator series 1 is attached to the link attachment holes 4 via links 5. Another metal mounting hole 6 is formed at the center of the double yoke 2 and is connected to the tower arm 7.

  In the case of a triple tension insulator shown in FIG. 2, two double yokes 2 having link attachment holes 4 at both ends are connected to each other by connecting the central link attachment hole 4 coaxially. The insulator series 1 is attached to each link attachment hole 4 via a link 5. During the vibration of the electric wire or the insulator string, the two double yokes 2 are moved, and automatic adjustment is performed so that an equal tensile load is applied to the three lever strings 1.

  When the lightning arrester 10 is attached to the above-described double tension insulator device, the lightning arrester device 10 is attached to the center position of the double yoke 2 in consideration of the weight balance. When the lightning arrester 10 is attached to the triple tension insulator, the lightning arrester is mounted on the central axis of the triple tension insulator so that the lightning arrester is mounted on the central axis of the double tension insulator. A method of mounting is conceivable. However, based on this idea, when installing a lightning arrester, it is necessary to fix the lightning arrester with a lightning arrester mounting bracket (horn mounting bracket) straddling two double yokes as shown in FIG. In this case, the movement of the two double yokes 2 is hindered by the base portion of the lightning arrester mounting bracket (horn mounting bracket) shown by hatching, and the equal tension to the insulators by the movement of the two double yokes 2 This impedes the function of adjusting the load, and further, an unreasonable load is applied to the lightning arrester mounting bracket (horn mounting bracket) straddling the two double yokes 2 or the two double yokes 2.

  In order to solve the above-mentioned problem, as shown in FIG. 2, a method of attaching a lightning arrester device 10 at the center position of one double yoke 2 and attaching a balance weight 11 to the other double yoke 2 can be considered. However, in the example of the lightning arrester for 275 kV, as described above, the lightning arrester 10 is quite heavy with a weight of several tens of kilograms. There is a problem that the mounting work is not easy. If the balance weight 11 is omitted, a special load accompanying twisting is applied to the link or other connecting metal fitting, which is not preferable because the strength and durability are impaired.

JP-A-9-233661

  The present invention solves the above-mentioned conventional problems, can reduce the weight of the balance weight despite having a lightning arrester which is a heavy object, and does not cause a loss of weight balance. An object of the present invention is to provide a triple tension insulator device with a lightning arrester that does not impair the function of the tension insulator device.

  In order to solve the above problems, the triple tension insulator device with a lightning arrester of the present invention connects two double yokes having link mounting holes at both ends, with the central link mounting hole being coaxial. By doing so, a triple yoke is constructed, and a three-strand tension insulator device in which an insulator series is attached to each link attachment hole via a link, and one of the two yokes overhangs in the direction of the center link attachment hole. A lightning arrester held near the center axis of the triple tension insulator by the horn mounting bracket and the other two yokes or the outer link to balance the weight of the horn mounting bracket. It is characterized by comprising a small balance weight.

  In addition, instead of the arc horn, a structure in which an arc horn that forms a discharge gap with the tip electrode of the lightning arrester is attached between the links on both outer ends of the triple yoke located on the opposite side of the lightning arrester A lightning arrester can be attached and a discharge gap can be formed between the lightning arresters on both sides.

  The three-strand tension insulator device with a lightning arrester of the present invention has a lightning arrester in the vicinity of the central axis of the triple tension insulator device by a horn mounting bracket that overhangs from one of the two yokes in the direction of the center link mounting hole. Since the structure is equipped with a small balance weight to hold and balance the weight of the horn mounting bracket, the balance of the entire insulator device is lost despite the fact that the lightning arrester is several tens of kilograms. Absent. For this reason, the balance weight can be reduced in weight, and the weight balance is not lost, so that a special load due to twisting is not applied to the connection fitting.

FIG. 3 is a plan view of a double tension insulator device with a lightning arrester. It is a top view of the conventional triple tension insulator apparatus with a lightning arrester. It is explanatory drawing of the state which attached the lightning arrester attachment bracket across two double yokes. It is a top view of the triple continuous tension insulator apparatus with a lightning arrester of the present invention. It is a front view of the triple continuous tension insulator apparatus with a lightning arrester of the present invention. It is an enlarged plan view of a horn mounting bracket.

Embodiments of the present invention will be described below.
FIGS. 4 and 5 show an embodiment of the present invention, in which two double yokes 2 having link mounting holes 4 at both ends are connected to be bent with a central link mounting hole 4 being coaxial. A triple yoke 12 is formed. In this embodiment, the triple yoke 12 has the same structure on both the ground side and the power application side, and the lever series 1 is attached to each link attachment hole 4 via a link 5. A bracket mounting hole 6 is formed at the center of each double yoke 2 on the ground side, and is connected to the tower arm 15 via another link 13 and bracket 14. Similarly, a metal fitting mounting hole 6 is formed at the center of the double yoke 2 on the power application side, and a power transmission line 18 is connected via another link 16 and metal fitting 17.

  In the present embodiment, the lightning arrester 10 is fixed to the ground side triple yoke 12 by a horn mounting bracket 20. As described above, the lightning arrester 10 itself includes zinc oxide elements arranged in series, and the outside thereof is covered with a jacket and an electrode is attached to the tip. As shown in FIG. 6, the horn mounting bracket 20 has a base portion 21 fixed to one of the two yokes 2 by bolts, and the horn mounting plate portion 22 at the tip thereof is extended so as to overhang in the direction of the center link mounting hole. Of the structure. By adopting such a structure, the lightning arrester 10 which is a heavy object is held near the central axis of the triple tension insulator, and further, the movement of the two yokes 2 of the triple tension insulator is obstructed. In order not to do so, the yoke is not installed across the yokes. Here, the vicinity of the central axis of the triple tension insulator device means that a deviation of about the diameter of the lightning arrester 10 from the central axis of the triple tension insulator device is allowed.

  However, even if the lightning arrester 10 is held near the central axis of the triple tension insulator as described above, the weight of the double yoke 2 on one side increases by the weight of the horn mounting bracket 20. Therefore, in the present invention, the small balance weight 30 is attached to the opposite double yoke 2 or the outer link 5 to eliminate the weight imbalance. The small balance weight 30 is, for example, a steel product that has been galvanized. The weight is only about 10 kg, which is much lighter than the conventional balance weight 11 shown in FIG. For this reason, the manufacturing cost is low, and the mounting work on the steel tower becomes easy. As described above, it is possible to reduce the weight of the small balance weight 11 by attaching the lightning arrester 10 so as to be slightly shifted from the central axis of the triple tension insulator device to the opposite side.

  An arc horn 40 that forms a discharge gap G with the tip electrode of the lightning arrester 10 is attached between the links 5 and 5 on both outer ends of the triple yoke 12 located on the opposite side of the lightning arrester 10. It has been. However, the method of attaching the arc horn 40 is not particularly limited, and various modifications can be made to the shape of the arc horn 40. Further, a lightning arrester can be attached in place of the arc horn 40.

  In the three-strand tension insulator device with a lightning arrester of the present invention configured as described above, the three insulator strings 1 are supported by the three yokes 12 so that each insulator element 1 can equally share the tensile load. Also, in the event of a lightning strike, a lightning surge current is caused to flow through the lightning arrester 10 through the discharge gap G to avoid breakage of the insulator device or flashover between arc horns in the same manner as a conventional insulator device with a lightning arrester. is there. However, as mentioned above, the triple tension insulator device with a lightning arrester according to the present invention secures the overall weight balance by the small balance weight 30 which is much lighter than the conventional product, and is accompanied by twisting of the connecting metal fittings. Generation of load can be avoided. For this reason, the manufacturing cost is lower than in the prior art, and the mounting work on the steel tower can be facilitated.

  In the embodiment described above, the lightning arrester 10 is attached to the ground side of the insulator series 1, but it can also be attached to the power application side. Moreover, it is also possible to attach the lightning arrester 10 to both sides of the grounding side and the charging side.

DESCRIPTION OF SYMBOLS 1 insulator series 2 2 series yoke 3 2 series yoke 4 link attachment hole 5 link 6 metal fitting installation hole 7 tower arm 10 lightning arrester 11 balance weight 12 triple yoke 13 link 14 metal fitting 15 steel tower arm 16 link 17 metal fitting 18 power transmission line 20 horn Mounting bracket 21 Base 22 Horn mounting plate 30 Small balance weight 40 Arc horn

Claims (2)

  Two double yokes with link mounting holes at both ends are connected to each other by connecting the central link mounting hole coaxially to form a triple yoke, and an insulator is attached to each link mounting hole via a link. A three-strand tension insulator device, a lightning arrester held near the central axis of the triple tension insulator device by a horn mounting bracket overhanging from one of the two yokes in the direction of the center link attachment hole, A triple tension insulator device with a lightning arrester comprising a small balance weight attached to the other two yokes or the outer link to balance the weight of the horn mounting bracket.   An arc horn or a lightning arrester that forms a discharge gap with the tip electrode of the lightning arrester is attached between the links of both outer ends of the triple yoke located on the opposite side of the lightning arrester. A triple tension insulator device with a lightning arrester according to 1.

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