JPH0617047U - Insulator with lightning protection unit - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the non-linear resistor is destroyed by a lightning surge, the insulator will not be damaged and the insulation support of the wire will be prevented from being hindered. [Structure] A non-linear resistor 30 is sandwiched between a first electrode 27 and a second electrode 28, and they are enclosed in an elastic insulating coating 32 to form a cylindrical lightning protection unit 20. . The lightning protection unit 20 is concentrically mounted on the outer periphery of the insulator body 1 in a state of being separated from the grounding portion 4. First electrode 27
Is connected to the power applying unit 9 and the second electrode 28 is opposed to the grounding unit 4 with a predetermined distance.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an insulator with a lightning protection unit for insulatingly supporting an electric line and protecting it from a lightning surge.

[0002]

[Prior art]

 Conventionally, as an insulator provided with this type of lightning protection function, for example, those having a structure as shown in Japanese Utility Model Publication No. 64-53005 and Japanese Utility Model Publication No. 1-29934 are known.

In the former conventional configuration, the insulator body is formed in a hollow shape, and the non-linear resistor is hermetically housed in the hollow portion. Further, in the latter conventional configuration, a lightning protection unit having a non-linear resistor built in is provided in parallel on a side portion of the insulator body at a predetermined interval.

[0004]

[Problems to be solved by the device]

 However, in the former conventional configuration, when the non-linear resistor is destroyed due to an excessive lightning surge, the follow current flows inside the insulator body, causing damage to the insulator body due to high heat and pressure shock of the follow arc, and There was a problem of causing a secondary disaster such as a fall of a ship.

Further, in the latter conventional configuration, since the lightning protection unit is arranged on the side of the insulator main body, there is a problem that it occupies a space on the utility pole and is apt to hinder the work on the pole.

The present invention has been made by paying attention to the problems existing in such a conventional technique, and the purpose thereof is that even if the nonlinear resistor is destroyed due to a lightning surge. Another object of the present invention is to provide an insulator with a lightning protection unit that does not have a problem in insulating and supporting electric wires and does not require a large space for installation and can be easily implemented on an existing insulator.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, in the insulator with a lightning protection unit of the present invention, a non-linear resistor is sandwiched between the first electrode and the second electrode, and they are enclosed in an elastic insulating coating. To form a cylindrical lightning protection unit. The lightning protection unit is concentrically mounted on the outer circumference of the insulator body in a state of being separated from the grounding part, and the first electrode is connected to the power-supplying part and the second The electrode was made to face the ground part with a predetermined distance.

[0008]

[Action]

 In the insulator with a lightning protection unit configured as described above, the lightning surge flows from the voltage applying section to the non-linear resistor through the first electrode, and then is discharged from the second electrode to the ground section. As a result, the voltage rise in the line is suppressed and the follow current is cut off.

At this time, even if the non-linear resistor is destroyed by an excessive lightning surge, the follow-up arc diffuses to the outer peripheral region of the insulator body and is shielded and mitigated by the insulating coating. Therefore, the insulator main body is not damaged by the high heat or pressure shock of the follow-up arc, and it is possible to prevent the insulation support of the electric wire from being hindered.

Further, since the lightning protection unit is concentrically mounted and arranged on the outer periphery of the insulator main body, a large arrangement space is not required, and the lightning protection unit can be easily implemented on an existing insulator.

[0011]

【Example】

 Hereinafter, a first embodiment of an insulator with a lightning protection unit embodying the present invention will be described in detail with reference to FIGS. 1 and 2.

As shown in FIG. 1, a porcelain insulator main body 1 is composed of a body portion 2 and a cap portion 3 integrally formed on the outer periphery thereof. The base metal fitting 4 as a grounding portion is fitted and fixed to the lower end portion of the insulator main body 1 by cement, and the pin metal fitting 5 is protrudingly provided on the lower portion thereof. The insulator body 1 is installed on a utility pole (not shown) by tightening and fixing the pin fitting 5 to the ground fitting 7 such as a armrest with a nut 6.

The semiconductive base cover 8 is fitted on the outer periphery of the upper end of the base metal fitting 4 to prevent an external arc from connecting from the base metal fitting 4 to the body portion 2 and the cap portion 3 of the insulator body 1. The cap metal fitting 9 as an electric power applying portion is fitted and fixed to the upper end portion of the insulator main body 1 by cement, and the electric wire W is inserted and supported through the liner 11 in the electric wire groove 10 on the upper surface thereof. A pair of studs 12 and 13 are erected on the upper surface of the cap fitting 9, and a holding tool 14 is tightened and fixed to the studs 12 and 13 by a nut 15. The compression spring 16 is fitted and inserted into one of the studs 12, the spring force elastically supports the retainer 14, and the notch 17 is disengaged from the other stud 13. 14, the electric wire W can be easily attached and detached by rotating the holding tool 14 around the stud bolt 12 side while the pressing tool 14 is supported by the compression spring 16.

The lightning protection unit 20 is concentrically attached to the outer periphery of the body 2 in a state of being separated from the base metal fitting 4, that is, at the upper position of the insulator body 1, and urethane is provided in the gap between the inner peripheral surface and the body 2. A flexible insulating material 21 such as is filled to shield the insulator body 1 from the lightning protection unit 20.

Therefore, the structure of the lightning protection unit 20 will be described in detail. As shown in FIGS. 1 and 2, the lightning protection unit 20 is composed of a pair of substantially semi-cylindrical split bodies 22A and 22B. Connecting pieces 23, 24 are provided on both sides of the facing surface so as to project. Each pair of locking bodies 25 is formed to project from one coupling piece 23, and each pair of engaging holes 26 is formed in the other coupling piece 24 so as to engage with and disengage from the locking body 25. Then, on the outer periphery of the body portion 2 of the insulator body 1, the locking body 25 is engaged with the engagement hole 26 to connect the two divided bodies 22A and 22B to each other, whereby the cylindrical lightning protection unit 20 is formed. It is formed.

The first electrode 27 and the second electrode 28 are arranged at a predetermined interval in each of the divided bodies 22A and 22B, and a plurality of projecting pieces 29 are bent downward on the outer periphery of the second electrode 28. It is curved. The non-linear resistor 30 of zinc oxide (ZnO) type is sandwiched and fixed between the electrodes 27 and 28 in the one divided body 22A. The spacer 31 made of porcelain is sandwiched and fixed between the electrodes 27 and 28 in the other divided body 22B.

An elastic insulating coating 32 made of EP rubber or the like is provided in each divided body 22A, 22B so as to enclose both electrodes 27, 28 and non-linear resistor 30 or both electrodes 27, 28 and spacer 31. Is molded on the outer periphery of the. The cap portion 33 is formed on the lower end of the insulating cover 32, and the projecting piece 29 of the second electrode 28 is disposed above the inner top surface of the cap portion 33 so as to be immersed in the cap portion 33. The risk of electric shock is prevented.

A plurality of insulating folds 34 are formed on the outer peripheral surface of the insulating coating 32 in such a manner that the size changes in an alternating manner. Further, by alternately changing the outer diameter dimension of the insulation folds 34, the insulation distance of the outer peripheral surface of the insulation coating 32 is expanded, and rainwater is prevented from connecting between the vertically adjacent insulation coatings 32. Has become. Reference numeral 35 is a connecting plate between the nonlinear resistor 30 and the second electrode 28.

In each of the divided bodies 22 A and 22 B, the first electrode 27 has a plurality of connecting fittings 36 each having a hook-shaped tip attached to the upper surface thereof by screws 37. The first electrode 27 is electrically connected to the cap fitting 9 by elastically locking the hook-shaped portion of the connection fitting 36 to the outer peripheral edge of the lower end of the cap fitting 9. Further, the protruding piece 29 of the second electrode 28 is arranged to face the base metal member 4 with a predetermined air discharge distance G.

An insulating cover 38 made of EP rubber or the like is attached to the upper portion of the lightning protection unit 20, and the insulating cover 38 covers the charging section on the upper surface of the lightning protection unit 20.

Next, the operation of the insulator with a lightning arrester unit of the first embodiment configured as described above will be described. Now, in this insulator with a lightning protection unit, when a lightning surge enters the electric wire W, this surge flows from the cap metal fitting 9 to the non-linear resistor 30 via the first electrode 27, and then the protrusion 29 of the second electrode 28. The flashover occurs through the air discharge distance G and is discharged through the base metal fitting 4 and the ground metal fitting 7. As a result, the rise in voltage of the line is suppressed and the follow current is cut off.

Since the lightning protection unit 20 is mounted on the outside of the insulator body 1 and the non-linear resistor 30 of the lightning protection unit 20 is contained in the elastic insulation coating 32, it is possible to prevent an excessive lightning surge. Even if the non-linear resistor 30 is broken, the follow-up arc is diffused to the outer peripheral region of the insulator body 1 and is shielded and relaxed by the insulating coating 32. Therefore, the insulator main body 1 will not be damaged by the high heat or pressure shock of the follow-up arc, and it is possible to prevent the insulation support of the electric wire W from being hindered.

Further, in this embodiment, since the lightning protection unit 20 is concentrically mounted and arranged on the outer periphery of the insulator body 1, a large arrangement space for the lightning protection unit 20 is required on the side of the insulator body 1. Not. Therefore, the lightning protection unit 20 can be easily mounted on the existing insulator.

Further, in this embodiment, the lightning protection unit 20 is configured by being divided into two substantially semi-cylindrical division bodies 22A and 22B. Therefore, in a state in which the two divided bodies 22A and 22B are arranged around the outer periphery of the body portion 2 of the insulator body 1, the connecting pieces 23 and 24 can be connected by the engagement of the locking body 25 and the engagement hole 26. For example, the lightning protection unit 20 can be easily attached to the outer circumference of the body 2 of the insulator body 1.

[0025]

[Second Embodiment] Next, a second embodiment of the insulator with a lightning protection unit of the present invention will be described with reference to FIG.

In this embodiment, a large-diameter collar portion 41 and an annular electric wire groove 42 are formed on the outer periphery of the upper end of the insulator body 1, and the electric wire W is wound in the electric wire groove 42 with a bind wire 43 or the like. It can be fixed tightly. A cap-shaped fixing metal fitting 44 as an electric power applying portion is fitted and fixed to the outer periphery of the collar 41, and a plurality of locking portions 45 for locking the tip of the connecting metal fitting 36 are provided on the outer periphery of the fixing metal fitting 44. Has been.

Therefore, also in the second embodiment, the same operation as in the first embodiment described above is performed, and even if the non-linear resistor 30 is broken by an excessive lightning surge, the insulator body 1 is damaged. Therefore, it is possible to prevent the insulation support of the electric wire W from being hindered. Further, also in the second embodiment, since a large arrangement space for the lightning protection unit 20 is not required on the side of the insulator main body 1, it can be easily implemented for an existing insulator.

Further, in the second embodiment, a large-diameter collar portion 41 is provided at the upper end of the insulator body 1, and the lightning protection unit 20 is arranged immediately below the collar portion 41. Therefore, it is possible to prevent the possibility that rainwater or the like may enter the lightning protection unit 20 or be damaged, resulting in a decrease in dielectric strength.

The present invention is not limited to the configuration of the above-described embodiment, and may be modified and embodied as follows without departing from the spirit of the present invention. (1) The lightning protection unit 20 is integrally formed into a substantially cylindrical shape without being divided. (2) A plurality of engaging holes 26 that can be matched with each other are formed in the connecting pieces 23, 24 of the divided bodies 22A, 22B of the lightning protection unit 20, and a hook-shaped engagement that is separately formed in the engaging holes 26. Engage body 25 and insulating bolts to connect the split bodies 22A, 22B to each other. (3) Providing a pair or a plurality of non-linear resistors 30 without providing the spacer 31 in the lightning protection unit 20.

[0030]

[Effect of device]

 Since the present invention is configured as described above, even if the non-linear resistor is destroyed due to a lightning surge, there is no risk of impairing the insulation support of the wire, and moreover, the insulator body It has an excellent effect that it can be easily implemented on an existing insulator without requiring a large arrangement space for the lightning protection unit on the side.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of an insulator with a lightning protection unit embodying the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is a partially cutaway front view showing a second embodiment of the insulator with a lightning protection unit of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Insulator main body, 4 ... Base metal fittings as a grounding part, 9 ... Cap metal fittings as a power-charging part, 20 ... Lightning protection unit, 27
... first electrode, 28 ... second electrode, 30 ... non-linear resistor, 3
2 ... Insulation coating.

Claims (1)

[Scope of utility model registration request] 1. A lightning protection unit having a cylindrical shape, in which a non-linear resistor is sandwiched between a first electrode and a second electrode, and they are enclosed in an elastic insulating coating to form a cylindrical lightning protection unit. Was mounted concentrically on the outer periphery of the insulator body in a state of being separated from the grounding portion, and the first electrode was connected to the voltage applying portion, and the second electrode was opposed to the grounding portion at a predetermined distance. Insulator with lightning protection unit.