JP2016149829A - Power line seismic isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an iron tower etc. from being damaged or collapsed by an excessive tensile force being applied to a power line.SOLUTION: A power line seismic isolator 1 is disposed at the other end part G2 side of an insulator G in which a power line L is connected at one end part G1 side. The power line seismic isolator 1 includes: a weak part 25 which breaks when a predetermined force is applied thereto; and a damper 3 which operates to expand and increase looseness of the power line L when the weak part 25 breaks.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transmission line seismic isolation device disposed on the end side of an insulator of a transmission line, and more particularly, to a transmission line seismic isolation device that prevents a steel tower from collapsing due to excessive tension applied to the transmission line. .

  The power transmission line is held in a state where it is insulated by a steel tower or the like through an insulator, and the insulator includes a long insulator and a suspended insulator. Further, a steel core aluminum wire is used for the power transmission line, and the strength is secured by the steel core, and the tension / external force applied to the power transmission line is transmitted to a steel tower or the like through an insulator or the like.

  In addition, a high-voltage insulator that prevents the insulator from being broken by an earthquake is known (see, for example, Patent Document 1). This high-voltage insulator equipment includes a gantry and an elongate cocoon that stands vertically on the gantry, and is isolated from vibrations in the horizontal plane between the gantry and the lower end of the insulator. A seismic isolation device is provided.

JP 2006-210074 A

  By the way, when an earthquake occurs in the above-described arrangement state of the transmission line, snowfall occurs on the transmission line due to snowfall, or storms occur and the transmission line shakes violently, the transmission line and the insulator are greatly affected. Tension / external force is applied. If excessive tension or external force is applied, for example, the long insulators used to keep the jumper wires steady or the insulators installed in the substation premises are not only broken and damaged, but also to the transmission lines. The large tension and external force applied to the steel towers could cause damage or collapse.

  Moreover, in the high voltage insulator equipment of patent document 1, although the damage of the insulator by an earthquake can be prevented, when excessive tension | tensile_strength is applied to a transmission line, it can prevent that a steel tower etc. are damaged or collapsed. Can not.

  Accordingly, an object of the present invention is to provide a power transmission line seismic isolation device capable of preventing an excessive tension from being applied to a power transmission line and damaging or collapsing a steel tower.

  In order to solve the above problems, the invention of claim 1 is a power transmission line seismic isolation device disposed on the other end side of the insulator having a power transmission line connected to one end side, and a predetermined external force is applied. And a weak point portion that breaks, and a damper that is actuated and stretched when the weak point portion breaks to increase the degree of slackness of the power transmission line.

  According to this invention, for example, this power transmission line seismic isolation device is installed between the tip of the armature of a steel tower and the insulator connecting the power transmission lines. And when an earthquake etc. generate | occur | produces and a predetermined external force is applied to a power transmission line and a power transmission line seismic isolation device, a weak point part will fracture | rupture and a damper will operate | move and the slackness (hanging amount) of a power transmission line will increase.

  According to a second aspect of the present invention, in the transmission line seismic isolation device according to the first aspect, both end portions of the damper are held by the weak point portion, and the damper is extended by breaking the weak point portion. And

  According to a third aspect of the present invention, in the power transmission line seismic isolation device according to the second aspect, the weak point portion is detachable from the damper.

  According to the first aspect of the present invention, when an earthquake or the like occurs and a predetermined external force is applied to the transmission line and the transmission line seismic isolation device, the damper is activated to increase the degree of slackness of the transmission line. And when the slackness of the transmission line increases, the force (tension) transmitted through the transmission line decreases, so it is possible to prevent or suppress the tower from being damaged or collapsed due to excessive tension applied to the transmission line. Become.

  According to the second aspect of the present invention, since both end portions of the damper are held by the weak point portions, and the damper only expands when the weak point portion is broken, a simple configuration can be achieved. As a result, it is possible to reduce the size and weight, and to reduce the manufacturing cost.

  According to the invention of claim 3, since the weak point portion is detachable from the damper, the damper can be reused even if the weak point portion is broken. In other words, since only the weak points need to be replaced, the economy is enhanced.

It is a front view which shows the power transmission line seismic isolation apparatus which concerns on Embodiment 1 of this invention. It is a front view which shows the state which the damper of the power transmission line seismic isolation apparatus of FIG. 1 act | operated. It is a front view which shows the power transmission line seismic isolation apparatus which concerns on Embodiment 2 of this invention.

  The present invention will be described below based on the illustrated embodiments.

(Embodiment 1)
FIG. 1 is a front view showing a power transmission line seismic isolation device 1 according to this embodiment. The power transmission line seismic isolation device 1 is a seismic isolation device disposed on the other end G2 side of the insulator G in which the power transmission line L is connected to the one end G1 side, and mainly includes the mounting bracket 2 and the damper 3. I have. Here, the transmission line L is constructed between steel towers, between a steel structure of a substation and a steel tower, and the like.

  The mounting bracket 2 is a plate material having a substantially “E” shape in plan view, and a first U-shaped bolt 23 is disposed on the first horizontal portion 21, and a second U-shaped bolt is disposed on the second horizontal portion 22. 24 is arranged. Then, it is connected / coupled to the plate P attached to the tip of the armature of the steel tower via the first U-shaped bolt 23, and the other end of the insulator G is connected to the second U-shaped bolt 24. It is connected to G2.

  Further, the vertical portion 25 of the mounting bracket 2 functions as a weak point portion, and breaks when a predetermined external force is applied. That is, notch-shaped notches 2a and 2a are formed on both side edges of the vertical portion 25, respectively. When a predetermined external force is applied, the vertical portion 25 is broken starting from the notches 2a and 2a. Specifically, when the tension applied to the transmission line L exceeds a predetermined value, the shape and position of the notches 2a and 2a are set so as to break from the notches 2a and 2a. The breaking force (predetermined value) is set to approximately 60 to 70% of the tensile strength of the transmission line.

  When priority is given to the protection of the armrests / arms and the insulator G of the steel tower, the breaking force required for breaking from the notches 2a and 2a is set to be smaller than the tensile strength of the armrests and the insulator G. Similarly, when giving priority to the protection of the insulator G in the substation, the breaking force required for breaking from the notches 2a and 2a is set smaller than the tensile strength of the insulator G. In this way, by setting the breaking force required for breaking from the notches 2a and 2a to be smaller than the tensile strength of the object to be protected, the notch 2a can be protected before the object to be protected is damaged by excessive tension or external force. The vertical portion 25 is broken from 2a.

  Then, the shape and position of the notches 2a and 2a are set so as to break with such a breaking force, and the two notches 2a and 2a are opposed (proximity) as shown in FIG. 1 according to the required breaking force. Or the two notches 2a and 2a are shifted (separated).

  The damper 3 is a damper that operates and extends when the vertical portion (weak point portion) 25 breaks, and increases the slackness of the transmission line L. That is, in this embodiment, two bodies are attached so as to connect both end portions of the horizontal portions 21 and 22. The damper 3 includes a cylindrical cylinder case 31, a coil spring 32 and a rod 33 disposed in the cylinder case 31. The free end portion side of the rod 33 protrudes from one end portion of the cylinder case 31 and is connected to the first horizontal portion 21, and the other end portion of the cylinder case 31 is connected to the second horizontal portion 22.

  In this way, at normal times (when not operating), both end portions of the damper 3 (the free end portion of the rod 33 and the other end portion of the cylinder case 31) are connected to the vertical portion (weak point) via the horizontal portions 21 and 22. Part) 25. A coil spring 32 that is a compression coil spring is disposed between a piston pad 34 provided at an end of the rod 33 in the cylinder case 31 (on the side opposite to the free end) and one end of the cylinder case 31. ing.

  Then, as shown in FIG. 2, when the vertical portion 25 of the mounting bracket 2 breaks starting from the notches 2a and 2a, the damper 3 operates and extends. That is, the coil spring 32 is compressed by the tension / external force from the power transmission line L, and the rod 33 extends from one end of the cylinder case 31. Thus, the damper 3 extends and the horizontal portions 21 and 22 are separated from each other, whereby the position of the insulator G connected to the transmission line seismic isolation device 1 is extended (away from the plate P), and the transmission line L The degree of slack (the amount of sag) increases.

  Here, the length that the damper 3 extends, that is, the length that the rod 33 extends (free length) is reflected in the increase amount of the slackness of the transmission line L. For this reason, even if the damper 3 operates, this free length is set so that a short circuit does not occur by contacting the adjacent upper and lower power transmission lines L. On the other hand, when giving priority to the protection of the steel tower and the insulator G, the free length may be set more than contacting the upper and lower transmission lines L.

  In addition, the coil spring 32 has a function of absorbing tension (stress) from the power transmission line L and suppressing the vibration by expanding and contracting with the vibration of the power transmission line L, and the strength (spring coefficient) of the coil spring 32. ) And the number of dampers 3 are set according to the tension applied to the assumed power transmission line L.

  Next, the operation of the transmission line seismic isolation device 1 having such a configuration will be described.

  First, the power transmission line seismic isolation device 1 is installed between, for example, a plate P attached to a tip of a steel tower arm and an insulator G connecting the power transmission line L. In other words, the transmission line seismic isolation device 1 is installed by connecting to the plate P through the first U-shaped bolt 23 and connecting to the other end G2 of the insulator G through the second U-shaped bolt 24. To do.

  In such an installation state, when an earthquake or the like occurs and a predetermined external force is applied to the transmission line L, the insulator G and the transmission line seismic isolation device 1, as shown in FIG. 2, the mounting bracket starts from the notches 2a and 2a. The vertical part 25 of 2 breaks, and the damper 3 operates and extends. That is, the coil spring 32 is compressed, the rod 33 extends from the cylinder case 31, the position of the insulator G connected to the transmission line seismic isolation device 1 moves away from the steel tower, and the slackness of the transmission line L increases ( It hangs down).

  As described above, according to the transmission line seismic isolation device 1, when a predetermined external force is applied to the transmission line L, the insulator G, and the transmission line seismic isolation device 1 due to the occurrence of an earthquake, storm, or snowfall, the damper 3 And the slackness of the transmission line L increases. And when the slackness of the power transmission line L increases and hangs down, the force transmitted through the power transmission line L decreases (because the tension becomes difficult to be transmitted), so that excessive tension is applied to the power transmission line L and the insulator G is damaged, It becomes possible to prevent and suppress the steel tower from being damaged or collapsed. As a result, even if an earthquake or the like occurs, power transmission can be continued without power failure.

  Further, the transmission line seismic isolation device 1 only includes the mounting bracket 2 and the damper 3, and both ends of the damper 3 are held by the vertical portion 25, and when the vertical portion 25 breaks, the damper 3 only extends. Therefore, the configuration is simple. As a result, it is possible to reduce the size and weight, and to reduce the manufacturing cost.

(Embodiment 2)
FIG. 3 is a front view showing the power transmission line seismic isolation device 1 according to this embodiment. In this embodiment, the configuration is different from that of the first embodiment in that the vertical portion (weak point portion) 123 is detachable with respect to the damper 3, and the same reference numerals are used for the same configuration as the first embodiment. A description thereof will be omitted.

  The mounting bracket 2 includes a first horizontal portion 121, a second horizontal portion 122 that faces the first horizontal portion 121, and a vertical portion that connects the horizontal portions 121 and 122 and is substantially perpendicular to the horizontal portions 121 and 122 ( It is composed of 3 pieces of weak point portion 123. The vertical portion 123 is detachably connected to the horizontal portions 121 and 122 via bolts, nuts, and the like. Similarly to the first embodiment, both end portions of the damper 3 (the free end portion of the rod 33 and the other end portion of the cylinder case 31) are connected to the horizontal portions 121 and 122. In this way, the vertical portion 123 is detachable from the damper 3 via the horizontal portions 121 and 122.

  According to this embodiment, the power transmission line seismic isolation device 1 can be reused even after the power transmission line seismic isolation device 1 is activated. That is, since the vertical portion 123 is detachable from the damper 3, even if the vertical portion 123 breaks, the damper 3 and the horizontal portions 121 and 122 can be reused. For this reason, it is only necessary to replace the vertical portion 123, and it is not necessary to replace the entire transmission line seismic isolation device 1.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, although the case where the transmission line seismic isolation device 1 is installed between the plate P and the insulator G has been described, depending on the protection object, etc., between the plate P and the yoke, between the steel structure and the insulator G, etc. In addition, the power transmission line seismic isolation device 1 may be installed.

  Further, in the above embodiment, the planar shape of the mounting bracket 2 is substantially “e”, but other shapes may be used. For example, a substantially “U” shape may be used, and the damper 3 may be disposed in the U-shaped opening (in parallel with the vertical portion) with the U-shaped vertical portion as a weak point. The damper 3 is a spring type, but may be a pneumatic type or a hydraulic type.

1 Transmission line seismic isolation device 2 Mounting bracket 21, 22 Horizontal part 25 Vertical part (weak spot)
123 Vertical part (weak spot)
2a notch 3 damper 31 cylinder case 32 coil spring 33 rod L transmission line G insulator G1 one end G2 other end

Claims (3)

A transmission line seismic isolation device disposed on the other end side of the insulator with the transmission line connected to one end side,
A weak spot that breaks when a predetermined external force is applied;
A damper that activates and extends when the weak point breaks, and increases the slackness of the transmission line;
A transmission line seismic isolation device characterized by comprising: Both ends of the damper are held by the weak point portion, and the damper is extended by breaking the weak point portion.
The power transmission line seismic isolation device according to claim 1. The weak part is detachable from the damper,
The power transmission line seismic isolation device according to claim 2.

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