JPH062519U - Lightning protection horn - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a lightning protection horn which is capable of avoiding explosive destruction due to a continuous arc at the time of failure, is easy to process, and has no fear of insulation failure. [Structure] Electrode metal fittings 5 and 6 on the grounding side and the charging side are fixed to both ends of the pressure-proof insulating cylinder 1 to accommodate a current limiting element 7.
Further, the electrode fittings 5 and 6 and the current limiting element 7 are electrically connected,
An insulating jacket 3 having a large number of pleats 4 is provided on the outer periphery of the pressure-proof insulating cylinder 1. In the lightning protection horn having the above structure, the pressure-resistant insulating cylinder 1 has a large number of reinforcing fibers 2 embedded therein. The reinforcing fibers 2 are arranged along the axial direction of the pressure resistant insulating cylinder 1. Therefore, when the current limiting element 7 becomes conductive and a follow current flows, the inside of the lightning protection horn becomes high temperature and high pressure, but the withstand voltage insulating cylinder 1 is split vertically along the reinforcing fiber 2 and is released to the outside. Pressure is applied.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is used to form an air discharge gap, and when a lightning surge current flows through a transmission line or a distribution line, it is quickly discharged to the ground, and the commercial frequency that occurs after that is continued. The present invention relates to a lightning protection horn that can suppress and block a flow.

[0002]

[Prior art]

 This type of lightning protection horn is provided with a pressure release means so that when the current limiting element is destroyed by a lightning strike more than expected, the entire horn will not explode and be destroyed by the follow current arc. As a conventional pressure releasing means, as shown in FIG. 3, a structure in which a slit 16 extending in the axial direction is provided on a peripheral wall of a pressure-resistant insulating cylinder 15 is proposed.

[0003]

[Problems to be solved by the device]

 However, when performing slit processing, it is necessary to perform a plurality of operations in the circumferential direction and the axial direction, and since the processing also requires precision and the number of processing steps increases, there is a limit to cost reduction. In addition, it is inevitable that the strength will be lower than that of the unprocessed one, so there was a problem that it would be necessary to increase the thickness due to processing.

Therefore, the present invention has been made by paying attention to the problems existing in such a conventional technique, and its purpose is to avoid explosive destruction due to a follow-up arc at the time of failure. Another object of the present invention is to provide a lightning protection horn that can be manufactured at a reduced cost and that does not require slit processing and does not cause insulation failure.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, the metal fittings on the grounding side and the charging side are fixed to both ends of the withstand voltage insulating cylinder, and the current limiting element with a non-linear voltage-current characteristic is provided inside the withstand voltage insulating tube. In a lightning protection horn that accommodates a child, electrically connects the electrode fitting and the current limiting element, and provides an insulating jacket having multiple pleats on the outer periphery of the pressure resistant insulation cylinder, the pressure resistance insulation cylinder is The gist is that a large number of reinforcing fibers are embedded and the reinforcing fibers are arranged along the axial direction of the pressure-proof insulating cylinder.

[0006]

[Action]

 With the above configuration, when the current limiting element becomes conductive and a follow current flows, the temperature inside the lightning protection horn becomes high temperature and high pressure. Since there are no circumferential fibers in the pressure-resistant insulating cylinder, circular pressure tends to cause axial cracks along the reinforcing fibers, and the pressure is released to the outside from there.

[0007]

【Example】

 An embodiment embodying the present invention will be described below with reference to FIGS. As shown in FIG. 1, the withstand voltage insulating cylinder 1 is formed in a cylindrical shape from a reinforced resin (for example, epoxy resin-impregnated FRP) having excellent weather resistance and aging. That is, the pressure-resistant insulating cylinder 1 has a large number of glass fibers 2 as reinforcing fibers embedded therein, and the glass fibers 2 simply extend in parallel to the axial direction. The glass content of the pressure-resistant insulating tube 1 is 60% to 75% by weight in order to sufficiently develop bending and tensile strength.

As shown in FIG. 2, cap-shaped electrode fittings 5 and 6 are fitted and fixed to the upper and lower end portions of the pressure-proof insulating cylinder 1 and the upper and lower end portions of the insulating jacket 3 by pressure contact. A large number of current limiting elements 7 made of, for example, zinc oxide having a non-linear voltage-current characteristic are stacked and housed in series inside the withstand voltage insulating cylinder 1, and upper and lower ends thereof are fixed disc springs 8, 9 and The electrode fittings 5 and 6 are electrically connected to each other through spacers 10 and 11 which are made of a metal such as aluminum or copper and which are cylindrical. Between the inner peripheral surface of the pressure-resistant insulating cylinder 1 and the outer peripheral surface of the current limiting element 7, an insulating filler such as silicon rubber is injected to form an insulating layer 12, which prevents the current limiting element 7 from moving and is airtight. And retains its insulating properties.

On the outer peripheral surface of the withstand voltage insulating cylinder 1, an insulating outer jacket 3 made of an organic elastic insulating material having weather resistance such as EPDM or silicon rubber is formed except for the vicinity of its end portion, and a large number of them are formed on the outer peripheral surface. The pleats 4 are integrally formed.

Screw holes 13 and 14 are formed in the electrode fittings 5 and 6, and the screw holes 13 are used for attaching a lightning protection horn to a support arm of a steel tower, and the screw holes 14 support a discharge electrode (not shown). Used to

Now, with the lightning protection horn attached to the support arm of the steel tower, when a lightning surge current flows through the power transmission line, the lightning surge current flows through the lightning protection horn to the steel tower and is discharged to the ground. Then, the subsequent current generated thereafter is quickly suppressed and cut off by the non-linearity of the voltage-current characteristic of the current limiting element 7.

Further, in the unlikely event that a large-scale lightning surge current flows through this lightning protection horn, the current limiting element 7 becomes conductive and a follow current flows, and High temperature and high pressure. This pressure is propagated to the pressure proof insulating cylinder 1 through the insulating layer 12 made of an insulating filler. At this time, since the glass fibers 2 embedded in the pressure-resistant insulating cylinder 1 are oriented only in the axial direction, the pressure-resistant insulating cylinder 1 is subjected to a large number of vertical directions as if it were cracking bamboo against pressure from the inside. A crack occurs. In this case, both ends of the pressure-proof insulating cylinder 1 are fixed so that the outer surfaces of the electrode fittings 5 and 6 are brought into contact with each other and pressed against the spacers 10 and 11. In this joining method, unlike the method using adhesion, screws, etc., the entire thickness of the portion of the pressure-proof insulating cylinder 1 to which pressure is applied receives the force. For this reason, the pressure-proof insulating cylinder 1 is subdivided by cracks and will not come off from this fixed portion even if a pulling force in the radial direction acts on the central portion. This point is structurally important. Then, due to this crack, the high-pressure gas breaks the pressure-resistant insulating cylinder 1, and subsequently breaks the insulating jacket 3 made of rubber and is released to the outside. Therefore, the entire lightning protection horn is not explosively destroyed. However, since the lightning protection horn of this embodiment does not have a slit, it does not require slitting and is easy to manufacture. In addition, since there are no slits, there is no cut and there is no risk of insufficient strength. Therefore, the thickness can be reduced and the property against moisture absorption is improved.

The present invention is not limited to the configuration of the above-mentioned embodiment, and may be modified within a range not departing from the gist of the present invention, for example, using other fiber such as Kevlar fiber as the reinforcing fiber. It is also possible to materialize.

Further, in the case of a long product, a crack may easily spread in the axial direction and the expansion in the radial direction may become too large, and the content may pop out. In such a case, a reinforcing ring 17 made of one or a plurality of FRPs in the axial direction is provided on the outer periphery of the pressure-resistant insulating cylinder 1 to limit the expansion of cracks in the radial direction, and to release the pressure-resistant insulating cylinder 1 as a whole. It is also possible to prevent the increase in thickness while ensuring the thickness.

[0015]

[Effect of device]

 According to the present invention, the pressure can be released safely without the risk of explosion, no new processing is required for the insulating cylinder, the manufacturing is easy, and there is no fear of insulation failure.

[Brief description of drawings]

FIG. 1 is a perspective view showing a withstand voltage insulating cylinder of a lightning protection horn embodying the present invention.

FIG. 2 is a half sectional view showing the entire lightning protection horn.

FIG. 3 is a perspective view of a withstand voltage insulating cylinder showing a conventional example.

[Explanation of symbols]

1 pressure-resistant insulating tube, 2 glass fiber constituting reinforcing fiber,
3 Insulation jacket resistance, 4 folds, 5 electrode fittings, 6 electrode fittings, 7 current limiting element.

Claims (1)

[Scope of utility model registration request] 1. An electrode metal fitting, wherein electrode fittings on the ground side and the voltage applying side are fixed to both ends of the pressure resistant insulation cylinder, and a current limiting element having a non-linear voltage-current characteristic is accommodated in the pressure resistant insulation cylinder. And a current limiting element are electrically connected, and in a lightning protection horn in which an insulating jacket having a large number of folds is provided on the outer periphery of the pressure-resistant insulating cylinder, the pressure-resistant insulating cylinder has a large number of reinforcing fibers embedded therein, A lightning protection horn, wherein the reinforcing fibers are arranged along the axial direction of the pressure-proof insulating cylinder.