JPH0710906U - Mold arrester - Google Patents

Abstract

(57) [Abstract] [Purpose] A molded lightning arrester in which the non-linear resistance element and the terminal fittings on both sides are electrically and mechanically stably coupled without the use of an insulating cylinder that causes an increase in size and scattering of debris. I will provide a. [Structure] Non-linear resistance element 3 and terminal fittings 1 and 2 on both sides are integrally wound by adhering a wide glass cloth 4 containing glass fibers in series on the outer peripheral surfaces thereof, The insulating coating 7 is molded on the outer periphery.

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded arrester used to protect a distribution line or the like from lightning surges. More specifically, the present invention relates to the outer circumference of a non-linear resistance element and terminal fittings on both sides. The present invention relates to a molded lightning arrester with an insulating coating.

[0002]

2. Description of the Related Art As a conventional molded arrester, for example, as disclosed in Japanese Utility Model Laid-Open No. 59-161287, a non-linear resistance element such as a zinc oxide element is housed in an insulating cylinder made of FRP or the like. It is known that after mechanically holding it between the terminal fittings provided at the opening of the insulating cylinder, the outer circumference of the terminal is covered with an insulating coating.

Further, as a molded lightning arrester that does not use an insulating cylinder as described above, a plurality of non-linear resistance elements are positioned or a mold resin or the like enters between the end surfaces of the non-linear resistance elements when forming an insulating coating mold. In order to prevent this, an outer peripheral surface covered with a shrink tube of EPR (ethylene-propylene rubber) is disclosed in Japanese Utility Model Publication No. 57-48588. In addition to this, there are also known products in which a thin self-adhesive tape is wound around the outer peripheral surface of multiple non-linear resistance elements, and those in which a rubber adhesive film is formed on the outer peripheral surface of multiple non-linear resistance elements. Has been.

However, in the case where the non-linear resistance element is housed in the insulating cylinder, the lightning arrester becomes large by that much, and when the temperature changes, the non-linear resistance element absorbs moisture in the void of the insulating cylinder due to breathing action. However, if the non-linear resistance element breaks due to excessive lightning surge, arc gas is generated due to the continuous flow from the line, and the highly rigid insulating tube is crushed and fragments are scattered around. It was

On the other hand, when a shrinkable tube, a self-adhesive tape, a film of a rubber-based adhesive or the like is used instead of the insulating cylinder, the holding force is insufficient, so that the fluidity of rubber or the like is increased during the molding process of the insulating coating. When pressure injection of a solid material with low heat resistance is performed, the connection between the non-linear resistance element and the terminal fittings on both sides may become unstable, and the electrical and mechanical connection between them may be impaired during use. was there.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and eliminates the use of an insulating cylinder that causes a large size and scattering of fragments, and a non-linear resistance element and terminal fittings on both sides. It was made in order to provide a molded lightning arrester that can stabilize the electrical and mechanical coupling between and.

[0007]

The mold arrester of the present invention, which has been made to solve the above-mentioned problems, has a non-linear resistance element sandwiched between terminal fittings on both sides and an insulating coating provided around the non-linear resistance element. In the molded lightning arrester, the non-linear resistance element and the terminal fittings on both sides are integrally bonded together by winding a wide glass cloth containing glass fiber around its outer surface in series and adhering it. It is a feature.

[0008]

In the molded lightning arrester of the present invention, the outer circumference of the non-linear resistance element and the terminal fittings on both sides are joined together by winding a wide glass fiber-containing cloth in series. It is held stable and as a result the electrical connection is stable. In addition, the non-linear resistance element and the terminal fittings on both sides are configured to relieve the stress on the outer peripheral surface protected by a piece of glass fiber-containing cloth and the insulating coating on its outer circumference, so that it is not affected by temperature changes. However, the formation of voids on the outer peripheral surface of the non-linear resistance element is blocked, and since moisture does not enter, the internal insulation is stable. Even if the non-linear resistance element is destroyed by an excessive lightning surge and arc gas is generated, the heat resistance and adhesive strength of the glass fiber-containing cloth prevent the non-linear resistance element from being separated and dispersed, so that the arc gas is locally emitted. The internal insulation is released and the internal pressure is released, so that debris and stored items are prevented from scattering from the inside.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the embodiments shown in the drawings. As shown in FIGS. 1 and 2, the molded arrester of the present invention has a plurality of non-linear resistance elements 3 made of a sintered body such as zinc oxide arranged in series between the terminal fittings 1 and 2 on both sides. It is attached to the outer peripheral surface, and a wide cloth 4 containing glass fiber, which has excellent mechanical strength and heat resistance, is wound in series, so that the terminal fittings 1 and 2 on both sides can be pulled toward each other. It is electrically connected and the whole is connected together.

As shown in FIG. 2, the glass fiber-containing cloth 4 has such a width that it can cover not only the outer peripheral surface of the non-linear resistance element 3 but also the outer peripheral surfaces of the terminal fittings 1 and 2 on both sides with one piece. is there. The surface is coated with a polyester resin, and the back surface is coated with an adhesive. This glass fiber-containing cloth 4 is a single flexible sheet with a thickness of about 0.2 to 0.3 mm, and its back side is the outer peripheral surface of the nonlinear resistance element 3 and the terminal fittings 1 and 2 on both sides. The non-linear resistance element 3 and the terminal fittings 1 and 2 on both sides are held in contact with each other by being wound several times while being adhered.

The contact surfaces of the terminal fittings 1 and 2 on both sides are in contact with the end surfaces of the non-linear resistance elements 3 which are adjacent to each other via the electrode plate 5 and the auxiliary sheet 6 made of a soft metal such as a lead plate. In addition, each non-linear resistance element 3 is also electrically contacted in sequence through the auxiliary sheet 6.

Each of the terminal fittings 1 and 2 is a columnar body having a base portion having substantially the same diameter as that of the non-linear resistance element 3, and the tip end portion thereof is formed to have a small diameter and a taper portion for retaining an insulating coating 7 described later. 1a and 2a are provided. In addition, 1c and 2c are similarly recessed portions for increasing the retention force of the insulating coating 7. Further, screw holes 1b or screw portions 2b are provided at the tips of the terminal fittings 1 and 2 to enable member connection and attachment to a grounded object.

In this way, the terminal fittings 1 and 2 on both sides and the non-linear resistance element 3 are integrally held by the glass fiber-containing cloth 4, and the outer periphery thereof is tapered portion 1a of the terminal fittings 1 and 2 on both sides. , 2a to the entire outer peripheral surface of the non-linear resistance element 3, an elastic insulating coating 7 such as EPR (ethylene / propylene rubber) is molded. This insulating coating 7 extends to the small-diameter portions of the terminal fittings 1 and 2 on both sides and is locked to the taper portions 1a and 2a to hold the terminal fittings 1 and 2 on both sides, and the glass fiber cloth 4 is used. The adherends of the terminal fittings 1 and 2 and the non-linear resistance element 3 are elastically wrapped from above and adhered to each other.

In the molded arrester thus constructed, the terminal fittings 1 and 2 and the non-linear resistance element 3 on both sides are axially retained by the glass fiber-containing cloth 4, and the outer peripheral surfaces thereof are made of glass fiber. Since they are held in a tightly bound state by the adhesive force of the inner cloth 4, an electrically stable contact is maintained. Further, since the adhered surface of the glass fiber cloth 4 is covered with the elastic insulating coating 7, the non-linear resistance element 3 is kept airtight and the non-linear resistance element is resistant to external temperature changes. At the outer peripheral surface of 3, the interface stress is relieved, and no void is formed on the adhered surface of the glass fiber-containing cloth 4. Therefore, the invasion of moisture to the outer peripheral surface of the nonlinear resistance element 3 due to the breathing action is prevented, and the insulation deterioration is eliminated, so that the internal insulation is stabilized.

Further, even if the non-linear resistance element 3 is destroyed due to an excessive lightning surge and an arc gas is generated due to the continuous flow, the adhesive strength and heat resistance of the glass fiber-containing cloth 4 wrapping the outer peripheral surface thereof The impact force due to the discharge of the arc gas is mitigated, and the separation and dispersion of the nonlinear resistance element 3 is prevented. Therefore, the discharge of the arc gas is locally retained to prevent the destruction from spreading, and at the arc gas discharge location, the rubber insulating coating 7 rapidly ruptures due to high heat and high pressure to release the pressure inside. Therefore, there is no possibility that fragments of the non-linear resistance element 3 or stored items will be scattered around and damage peripheral equipment.

Further, in the present invention, since the glass fiber cloth 4 is used in place of the conventional insulating cylinder, the whole size can be made smaller than that using the insulating cylinder, and the fluidity is low. Even in the step of pressure-molding a solid material to mold the insulating coating 7, electrical and mechanical coupling is not hindered, and a mold arrester with stable performance can be obtained.

[0017]

As described above, in the molded arrester of the present invention, the non-linear resistance element and the terminal fittings on both sides are formed by winding one wide cloth containing glass fiber around the outer peripheral surface thereof in series. Since they are integrated by adhering, it is possible to reduce the overall size, stabilize the electrical and mechanical coupling between the non-linear resistance element and the terminal fittings on both sides, and excessive lightning surge. There are many advantages, such as the ability to prevent the scattering of debris in the case of being hit.

[Brief description of drawings]

FIG. 1 is a central longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a perspective view showing a manufacturing process.

[Explanation of symbols]

1 terminal fitting, 2 terminal fitting, 3 non-linear resistance element, 4
Glass fiber cloth, 7 insulation coating

Claims (1)

[Scope of utility model registration request] 1. A molded lightning arrester in which a non-linear resistance element is sandwiched between terminal fittings on both sides and an insulating coating is applied around the non-linear resistance element, and the terminal fittings on both sides have a wide width.
A molded lightning arrester characterized in that a piece of cloth containing glass fibers is wound around the outer peripheral surface thereof in a series and adhered to each other to be integrally bonded.