JPH0617048U - 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 31 is sandwiched between a first electrode 28 and a second electrode 29, and they are enclosed in an elastic insulating coating 35 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 power applying unit 9. First electrode 28
While facing the power application unit 9 with a predetermined distance,
The second electrode 29 is connected to or close to the ground portion 4.

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 a space on the utility pole is required, which easily causes an obstacle during 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, and this lightning protection unit is concentrically attached to the outer periphery of the insulator body in a state of being separated from the electricity applying section, and the first electrode is placed at a predetermined distance from the electricity applying section. While facing each other, the second electrode was connected to the ground portion.

[0008]

[Action]

 In the insulator with a lightning protection unit configured as described above, the lightning surge is discharged from the voltage applying section to the first electrode and then discharged from the second electrode to the ground section via the non-linear resistor. 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, the porcelain insulator body 1 is composed of a body portion 2 and a pair of cap portions 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 at 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 braid with a nut 6.

A cap metal fitting 9 as an electricity applying portion is fitted and fixed to the upper end portion of the insulator main body 1 by cement, and an electric wire W is inserted and supported in an electric wire groove 10 on an upper surface thereof via a liner 11. 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.

A compression spring 16 is fitted and inserted into the one of the studs 12, the pressing force of the spring 14 elastically supports the retainer 14, and the notch 17 disengages from the other stud 13. Thus, the electric wire W can be easily attached and detached by rotating the stud 12 around the stud 12 while the presser 14 is supported by the compression spring 16.

The lightning protection unit 20 having a substantially cylindrical shape is concentrically mounted on the outer periphery of the lower portion of the body portion 2 of the insulator body 1 in a state of being separated from the cap fitting 9, and the inner peripheral surface thereof is made of a porcelain spacer. The protrusion 21 is provided. By engaging the spacer 21 with the annular groove 22 on the outer peripheral surface of the body 2, the lightning protection unit 20 is positioned and held at a predetermined lower position with respect to the body 2.

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 23A and 23B. The divided bodies 23A and 23B are connected to one end of the facing surface so as to be openable and closable by a pin 24, and a connecting piece 25 at the other end is tightened with an insulating bolt 26 and a nut 27, whereby the insulator body is formed. It is arranged concentrically on the outer periphery of the body portion 2 of 1.

The substantially semi-circular first electrode 28 and the second electrode 29 are arranged at a predetermined interval in each of the divided bodies 23 A and 23 B, and a protrusion 30 is provided above the outer peripheral edge of the first electrode 28. Is bent toward. A non-linear resistor 31 of zinc oxide (ZnO) type is sandwiched between both electrodes 28 and 29 in one divided body 23A and fixed by an insulating bolt 32. The spacer 33 made of porcelain is sandwiched between the electrodes 28 and 29 in the other divided body 23B, and is clamped and fixed by an insulating bolt 34.

An elastic insulating coating 35 made of EP rubber or the like is provided in each divided body 23A, 23B so as to enclose both electrodes 28, 29 and non-linear resistor 31 or both electrodes 28, 29 and spacer 33. Is molded on the outer periphery of the. The plurality of insulating folds 36 and 37 are formed on the outer peripheral surface and the inner peripheral surface of the insulating coating 35, so that the insulating cover 35 has a larger insulation distance. Reference numeral 38 is a connecting plate between the non-linear resistor 31 and the second electrode 29.

The connection support fitting 39 is attached by screws 40 to the lower surface of the second electrode 29 in each of the divided bodies 23 A and 23 B. Then, by elastically engaging the connection support fitting 39 with the outer peripheral edge of the upper end of the base fitting 4, the lower end of the lightning protection unit 20 is positioned and held at a predetermined position with respect to the base fitting 4, and The second electrode 29 is electrically connected to the base fitting 4. Further, the protruding piece 30 of the first electrode 28 is arranged to face the cap fitting 9 with a predetermined air discharge distance G therebetween.

Next, the operation of the insulator with a lightning protection 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 flashes over from the cap fitting 9 to the first electrode 28 through the air discharge distance G, and the non-linear resistor 31 and the second resistor It flows from the connection support fitting 39 to the base fitting 4 through the electrode 29, and is discharged through the ground fitting 7 and the like. 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 31 of the lightning protection unit 20 is contained in the elastic insulating coating 35, an excessive lightning surge may occur. Even if the non-linear resistor 31 is broken, the follow-up arc diffuses to the outer peripheral region of the insulator body 1, and is shielded and relaxed by the insulating coating 35. 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 23A and 23B. Therefore, by connecting the connecting pieces 25 with the insulating bolts 26 and the nuts 27 in a state in which the two divided bodies 23A and 23B are arranged around the outer circumference of the body portion 2 of the insulator body 1, the body portion of the insulator body 1 can be connected. The lightning protection unit 20 can be easily attached to the outer periphery of 2.

Moreover, in this embodiment, the lightning protection unit 20 is mounted on the outer periphery of the insulator body 1 in a state of being separated from the cap metal fitting 9 serving as a voltage applying section, and is connected to the base metal fitting 4. It is possible to safely perform the work of attaching and detaching the lightning protection unit 20 and the work of inspection.

Further, in this embodiment, when the lightning protection unit 20 is attached to the insulator body 1, a plurality of connection support fittings 39 attached to the lower portion of the second electrode 29 are provided on the outer peripheral edge of the upper end of the base metal member 4. It is engaged under the blast. Therefore, even if an external force is applied to the lightning protection unit 20, the lightning protection unit 20 will not be damaged or misaligned.

[0026]

[Another 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 cap portion 41 and an annular wire groove 42 are formed on the outer periphery of the upper end of the insulator body 1, and the wire W can be wound and fixed in the wire groove 42 with a bind wire 43 or the like. It has become. A cap-shaped discharge metal fitting 44 as a power-charging portion is fitted and fixed to the outer periphery of the cap portion 41, and the first electrode 28 of the lightning protection unit 20 is arranged at a predetermined air discharge distance G with respect to the discharge metal fitting 44. Has been done.

Therefore, also in the second embodiment, the same operation as in the above-described first embodiment is performed, and even if the non-linear resistor 31 is broken due to 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.

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) The connecting piece 25 of the divided bodies 23A and 23B of the lightning protection unit 20 is configured to be connected by the engagement of the hook-shaped locking body and the engagement hole. (3) Providing a pair or a plurality of non-linear resistors 31 without providing the spacer 33 in the lightning protection unit 20. (4) The connection support metal fitting 39 should be opposed to the base metal fitting 4 at a distance without coming into contact with the base metal fitting 4. In this case, the lightning protection unit 20 can be arranged below FIG. 1, for example, around the base metal fitting 4. (5) The lightning protection unit 20 is directly flashed from the electric wire W without providing the discharge fitting 44.

[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.

Further, according to the present invention, since the lightning protection unit is mounted on the outer periphery of the insulator body in a state of being separated from the electricity applying section, the lightning protection unit can be safely attached and detached and replaced. There is also an effect.

[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 a sectional view taken along 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 an electric power charging part, 20 ... Lightning protection unit, 28
... first electrode, 29 ... second electrode, 31 ... non-linear resistor, 3
5 ... 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 these are enclosed in an elastic insulating coating to form a cylindrical lightning protection unit. Was concentrically attached to the outer periphery of the insulator body in a state of being separated from the power applying section, and the first electrode was opposed to the power applying section at a predetermined distance, and the second electrode was connected to the grounding section. An insulator with a lightning protection unit.