JPS599902A - Gapless arrester - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a gapless lightning arrester using a zinc oxide element (hereinafter referred to as a ZnO element).

[Technical background of the invention]

A gapless lightning arrester is made by stacking a required number of ZnO elements having a high nonlinear coefficient, and its cross-sectional configuration is shown in FIG. In the figure, a required number of ZnO elements 1 are stacked together and fixed with a suitable support, and metal (
It is housed and fixed in a container 4 by a spacer tube 2 and a spring 3. Further, this container 4 has an airtight structure with upper and lower waste plates 5 and packing 6.

Since such a gapless lightning arrester does not have a series gap, a small current constantly flows through the ZnO element 1, and the ZnO element 1 generates heat due to power loss of the element 1. The power loss generated in this ZnO element 1 escapes into the atmosphere by heat radiation from the surface of the element 1 and heat conduction through the element-space tube, and ZnO reaches the balance point between heat generation and heat radiation.
The temperature of O element 1 will rise. On the other hand, when comparing the amount of heat dissipated from the surface of the element 1 and the amount of conduction heat of the element 1, the amount of conduction heat of the element 1 largely contributes to heat release.

[Problems with leisure technology]

Naturally, the heat conduction theory of ZnO element 1 is that as the number of elements increases, the amount of heat generated relative to the whole becomes smaller.
It is minimum at the center of Zn0g child group 1 shown in FIG. Therefore, when we analyze the element temperature distribution in Figure 1, we find that
As shown by the curve AK in the figure, the l crystallinity is maximum at the center of the element 1.

Therefore, if the heat radiation coefficient at the point of maximum temperature rise can be increased, it becomes possible to suppress the overall temperature rise.

In recent years, attempts have been made to incorporate an insulator with excellent thermal conductivity into contact with the surface of the element 1, but in this case corona generation or side flashing on the side surface of the element 1 may occur. It is undesirable as there is a risk of

[Purpose of the invention]

The present invention has been made in response to the above circumstances, and its purpose is to provide a gapless surge arrester that can improve heat dissipation characteristics without causing a change in the characteristics of the side surface of the ZnO element.

[Summary of the invention]

In order to achieve the above object, the present invention provides a gapless lightning arrester in which a predetermined number of zinc oxide elements having a nonlinear coefficient are stacked and housed in a container, in which the zinc oxide elements are divided into a plurality of unit blocks, and each unit block is They are electrically connected to each other by a gold 1fi body, and an insulator having a large thermal conductivity coefficient is arranged between the inner walls of the container.

[Embodiments of the invention]

An embodiment of the present invention shown in the drawings will be described below.

FIG. 3 shows a cross-sectional example of a gapless surge arrester according to the present invention. The same parts as in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted, and only the different parts will be described here.

That is, FIG. 3 shows a plurality of ZnO elements 1 (two in the figure).
The metal pipe 7 for assembling and fixing the element is electrically connected between each unit block at the approximate center where the temperature rise of the element 1 is maximum. The metal tube 2 is covered with an insulator 8 having a large thermal conductivity coefficient, and is brought into contact with the inner surface of the container 4.
In a gapless surge arrester having such a configuration, there is no need to directly insulate the side surface of the ZnO element 1 (as in the conventional case), and there is no risk of deterioration due to corona generation on the side surface of the ZnO element 1 or risk of side flash. Moreover, the heat can be dissipated directly into the container 4 through the metal pipe 7 and the insulator 8, and the temperature rise of the ZnO element 1 can be suppressed.

The heat distribution in this case is as shown by curve B in the $2 diagram. As a result, by using this Wlt description, ZnO element 1
By suppressing the temperature rise without any adverse effect on the element 1 itself, it is possible to permanently improve the reliability of the gapless arrester.

In the above embodiment, the metal tube 7° is placed at the position where the temperature rise of the ZnO element 1 is maximum, but it is possible to provide a plurality of metal tubes at positions where the fidelity is higher than the allowable level even if the temperature rise is not at the maximum position. You may testify.

Further, the container 4 is not limited to the case of an insulated tube, but is also effective for, for example, SF and FSS insulated equipment, and an example of its configuration is shown in FIG. In the figure, 1 is a ZnO element, 4 is a container, 7 is gold@pipe, 8 is an insulator, and 9 is SF and gas, respectively.

In addition, the present invention can be modified and implemented in various ways without changing the gist thereof.

〔Effect of the invention〕

As explained above, according to the present invention, a ZnO element is divided into a plurality of unit blocks, and a metal body for assembly and fixing is arranged between the blocks to electrically connect them, and an insulator with excellent thermal conductivity is used. Since the ZnO element is covered with , it is possible to provide an extremely reliable gapless lightning arrester that can improve heat dissipation characteristics without causing a change in the characteristics of the side surface of the ZnO element.

[Brief explanation of the drawings] Figure 1 is a sectional view showing a conventional gapless surge arrester, Figure 2 is a sectional view showing a conventional gapless surge arrester.
The figure shows the heat distribution of the ZnO element, FIG. 3 is a cross-sectional configuration diagram showing one embodiment of the present invention, and FIG. 4 is a cross-sectional configuration diagram showing another embodiment of the present invention. 1... ZnO element, 2... Spacer tube, 3... Spring,
4... Container, 7... Metal pipe, 8... Insulator. Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] In a gapless lightning arrester in which a predetermined number of zinc oxide elements having a nonlinear coefficient are stacked and housed in a container, the zinc oxide elements are divided into a plurality of unit blocks, and each unit block is electrically connected to each other by a metal body. A gapless lightning arrester characterized in that an insulator having a large thermal conductivity coefficient is arranged between the metal body and the inner wall of the FIJ container.