JPH0334886Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a lightning arrester in which non-linear resistors are laminated.

[Conventional technology]

Figure 2 shows a conventional lightning arrester using a non-linear resistor.

A bottom cover 4b is attached to the bottom of an insulating container 2 made of porcelain or the like, and a nonlinear resistor element 1 is laminated thereon. A pressure spring 3 is provided on the top of the non-linear resistor element 1, and is pressed by a top cover 4a. N ₂ gas is sealed through the filling port 9 of the upper lid 4a to improve the creeping pressure characteristics of the non-linear resistor element 1. Note that in order to keep the inside of the insulating container 2 airtight, O-rings 5 are used on the top cover 4a and the bottom cover 4b.

[Problem that the invention attempts to solve]

When a conventional lightning arrester is installed outdoors or the like, there is a risk that the airtightness maintained by the O-ring is reduced, and moisture such as rainwater penetrates into the non-linear resistor element, deteriorating the insulation performance. Furthermore, if an abnormal voltage is applied in such a state, the nonlinear resistor element will be destroyed. The blast wave and fragments further broke and scattered the insulating container, such as porcelain, and there was a fear that it would cause damage to peripheral equipment.

This invention was made to solve the above problems, and the purpose is to provide a highly reliable and safe lightning arrester.

[Means for solving problems]

In the lightning arrester according to this invention, an insulating holding member is tightly attached by heat shrinking so as to cover the outer periphery of the laminated non-linear resistor, and the insulating container and this holding member have high insulation properties and elasticity. It is equipped with an encapsulating member.

[Effect]

The enclosing member enclosed between the insulating container and the holding member prevents moisture from entering even if the airtightness provided by the O-ring or the like deteriorates. Furthermore, even if an overcurrent were to flow and destroy the lightning arrester, the insulating container would not be blown away because the adhesive force between the insulating container and the enclosing member is strong and the enclosing member itself has elasticity. Note that the holding member provided on the outer periphery of the stacked non-linear resistors prevents the enclosing member from entering between the non-linear resistors.

〔Example〕

An embodiment of this invention is shown in FIG. The outer peripheral surface of the non-linear resistor element 1, which has been laminated in advance under a constant pressure, is covered with a heat-shrinkable tube 71 as a holding member.
covered by. As the heat-shrinkable tube 71, a silicone-based shrinkable tube, for example, is preferable from the viewpoint of nonflammability. The nonlinear resistor element 1 coated in this manner is housed in an insulating container 2, and is fixed between the upper lid 4a and the lower lid 4b by the pressing force of the compression spring 3. A sufficiently mixed and deaerated silicone resin 72 (for example, KE-1206, KE-66, manufactured by Shin-Etsu Chemical Co., Ltd.) is injected into the sealing port 9 of the upper lid 4a under vacuum or normal pressure or under pressure, and is cured. let It is preferable to use a silicone resin as the encapsulating member that hardens at room temperature in order to simplify the work.

[Effect of idea]

According to this invention, the following effects can be obtained.

First, even if the airtightness of the lightning arrester deteriorates, moisture can be prevented from entering the insulating container, and insulation performance can be prevented from deteriorating.

Second, even if an overvoltage is applied and the nonlinear resistor element is destroyed, the insulating container will not be blown away because the insulating container is filled with the enclosing member.

Thirdly, since a non-flammable material is used as the enclosing member, there is no risk of burning up even if the temperature rises due to overvoltage or the like.

That is, it is possible to provide a highly reliable and highly safe lightning arrester.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of this invention, and FIG. 2 is a sectional view showing a conventional lightning arrester. 1 is a non-linear resistor, 71 is a heat shrink tube, 7
2 is silicone resin. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Non-linear resistors housed in a stacked manner in an insulating container, and a non-linear resistor provided tightly by heat shrinkage to cover the outer periphery of the stacked non-linear resistors. A lightning arrester comprising: a holding member having high insulation properties; and a non-combustible enclosing member having high insulation properties and elasticity, which is provided between the inner wall of the insulating container and the holding member. (2) The lightning arrester according to claim 1 of the utility model registration, characterized in that silicone resin is used as the encapsulating member.