JPS59723Y2 - Lightning arrester - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lightning arrester composed of a non-linear resistor whose main component is a metal oxide.

In recent years, characteristic elements formed by stacking the required number of nonlinear resistor elements (hereinafter referred to as elements) made of nonlinear resistors whose main component is a metal oxide at a rated voltage are housed in a container to create a gap. A surge arrester is configured that does not have a built-in lightning arrester.

On the other hand, the height of the insulating container that houses the elements together with the SF6 gas, such as a lightning arrester for a sealed switchgear filled with SF6 gas as an insulating medium, is determined by the L-pillar series configuration of the elements, since the dielectric strength of the elements increases due to air immersion. It is possible to make it considerably lower than the dimensions.

Therefore, the height of the arrester can be significantly reduced if the elements are configured in a multi-pillar configuration with two or three or more columns, and each element is connected in series as a whole.

For example, FIG. 1 shows an example of series connection using a two-pillar configuration.

Although four elements are shown in the figure, an insulating plate 2 is inserted every time a plurality of elements 1 are stacked on each column, and the elements between the two columns are connected in series by a connecting plate 3 and a connecting wire 4.

The required number of these structural units should be stacked and stored in an insulating container, and the entire device should be held down and fixed by spring pressure. If this is done alone, the device may shift due to vibration and impact during transportation, inducing internal corona from the edge of the device. Otherwise, the gap between adjacent elements becomes narrower and there is a risk of electrical contact.

In a surge arrester without a built-in gap, a small amount of current always flows through the elements, so the life of the arrester may be shortened due to a decrease in the current-carrying area between the adjacent elements due to misalignment of the elements, and thermal deterioration of the elements due to current concentration. There are concerns that it will shrink.

Possible countermeasures to this problem include fixing a plurality of epoxy resin rods 5 directly against the sides of the element as shown in Figure 2, or covering the element with a Teflon tube. The method of contacting the side surface of the element has problems in terms of reliability, and there are points to be improved.

The purpose of the present invention has been made to eliminate the above-mentioned problems, and it is an object of the present invention to provide a reliable lightning arrester that can prevent damage to the elements in a two-pole series connection configuration.

Hereinafter, the present invention will be explained with reference to the embodiments shown in FIGS. 3 and 4.

The same parts as in FIGS. 1 and 2 are given the same reference numerals.

As shown in FIG. 3, it is assumed that four elements 1 constitute a certain rated voltage, for example 7KV, and the element column 10 is
．． 20, and element unit groups 11, 12, 13 on the pillar 10 side.
．． 14 and element unit groups 21.22, 23.2 on the pillar 20 side
4 through insulating plates 30, and element unit groups 11, 21, 12, 22, 13, 23.
They are connected in series in the order of 4.

Although such two pillars are not shown, contact springs or spacing pieces are provided at the ends thereof, and the pillars are housed in an insulating container or a metal container to form a lightning arrester.

A guide flange 30a is provided on the insulating plate 30 to prevent the opposing elements from shifting across the insulating plate 30.

In addition, a guide hole 30b having a diameter slightly larger than the element diameter is provided on the opposite side of the insulating plate 30 from the collar 30a, and at least two parts of the elements of the other pillars are fitted into this hole, and any of the elements It serves as a guide for prevention.

Here, four elements are inserted into the insulating plate 30 in each stack, and the insulating plates between each column are arranged alternately so that the guide hole 30b for the insulating plate from the other column is placed exactly in the middle. They are placed at different locations.

The multi-column element unit group is connected by a connecting plate 3 and a connecting wire 4, and electrically connected in series.

Such building blocks can be stacked in multiple stages to obtain the required voltage rating.

If the elements and insulating plates are combined in this way, all the elements will have one of their two end faces facing the flange 3 of the insulating plate 30.
Since it is fixed on the side surface by the hole 30b or the hole 30b, there is no risk of the element shifting.

In particular, the shape of the insulating plate 30 as shown in FIG. 4 can be made of inorganic insulating materials such as Micalex (trade name), glass, or ceramics, so even if some parts come into contact with the sides of the element, it will not last for a long period of time. There is no risk of degrading the insulation between the two.

Also, stacking the elements and insulating plates one by one from the top of the assembly will naturally center the elements, and the insulating plates will serve as a support to mechanically connect the pillars. It is an advantage.

Note that when the unit of stacking elements is five or more, the same structure as the present invention can be achieved by appropriately increasing the height of the guide collar according to the number of stacked elements.

As described above, according to the present invention, by connecting a group of element units in series through an insulating plate and supporting the elements alternately on each column by the insulating plate, a lightning arrester can be created which can suppress the height of the arrester and prevent the elements from shifting. can be provided.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the main parts of a conventional lightning arrester, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a longitudinal sectional view showing the main parts of the lightning arrester of the present invention. Figure 4 is IV- of Figure 3.
It is a sectional view taken along the line IV. 1... Element, 2, 30... Insulating plate, 3
...Connection plate, 4...Connection wire, 10.2
0...Element column, 11.12, 13, 14, 21
．． 22゜23...Element unit group, 30 a...
...Guide collar, 30 b...Guide hole.

Claims (1)

[Scope of utility model registration request] An element consisting of a non-linear resistor whose main component is a metal oxide, an element unit group in which a plurality of these elements are stacked in series, and an insulating plate inserted between each unit group to form two elements stacked in multiple stages. A column is formed, and all the element unit groups are connected in series through connection members inserted before and after the insulating plate of each element column, and one side of the insulating plate is provided with the insulating plate sandwiched between the elements. A guide collar is provided to press the side surface of the end, and a guide hole slightly larger than the diameter of the element is provided at the other end, and the side surfaces of at least two elements of other columns are inserted and held in the guide hole, and the insulating plate is alternately inserted into each column. A lightning arrester in which the two element pillars formed by arranging the guide holes are housed in a container.