JPS6244681B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a zinc oxide type lightning arrester, and more particularly to an arrangement of elements of a lightning arrester aimed at downsizing, such as a metal container type lightning arrester.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lightning arrester with a compact structure and excellent voltage sharing characteristics.

The main point of the present invention is that the spiral electrical connection structure between elements in columns arranged in parallel is the same,
The reason is that the blocks within the column are arranged so that blocks with the same conditions face each other.

FIG. 1 shows an example of the element arrangement of a lightning arrester. 1st
The embodiment shown in the figures and FIG. 2 is an example in which the element 1 made of zinc oxide is composed of four blocks to form one column.
The connecting conductors 3 are electrically connected in the order of b, c, and d in a spiral manner. In this case, the limiting voltage of the elements connected between them is applied between the elements that have rotated once, so insulation is ensured by the insulator 2 interposed between the stacked elements 1.

However, in a UHV surge arrester, the energy consumed by the element as a surge arrester is extremely large compared to a 420kV surge arrester, so the one-column configuration shown in FIGS. 1 and 2 cannot cope with this problem. This problem can be solved by arranging several blocks of columns in parallel as shown in FIG.

If the rated voltage of the lightning arrester is determined now, the limiting voltage of the lightning arrester will be determined, and therefore the number of elements Ns to be connected in series will be determined. Also, if the energy E _L to be processed by the lightning arrester is determined, and the energy that can be processed by Ns lightning arrester elements is Es, then the number of parallel columns Np required to configure the lightning arrester is Np = E.
Determined by _L /Es.

FIG. 3 shows an example where Np=4 and the number of blocks in one column is 4.

The lightning arrester consists of columns A, B, C, and D.
Columns A, B, C, and D are electrically parallel.
As shown in FIGS. 1 and 2, the elements in each column are spirally arranged to reduce the height of the arrester, and the example shown in FIG. 2 is composed of four blocks. Since the arrangement of elements in columns A, B, C, and D has no relation to each other, consider, for example, the case where element blocks a, b, c, and d in each column are arranged as shown in Figure 3. . Figure 4 shows a perspective view.

As shown in FIG. 4, in the portion where block b of column A and block d of column B face each other, the positions of the elements are shifted from each other.
A potential difference of . Therefore, an insulator distance l ₁ commensurate with this is required.

FIG. 5 shows an embodiment of the present invention.

If you arrange the number of blocks in each column to be the same as the number of blocks 4, unify blocks a, b, c, and d in a clockwise direction, and furthermore make block b of column A and block b of column B face each other, all The same blocks face each other in the opposing parts.

For this reason, the opposing parts between each block have exactly the same arrangement of elements, and there is almost no potential difference between the blocks, so the interval between columns A and B, that is, the insulation distance _l2 , is small as shown in the figure. Enough is enough. (l ₁ > l ₂ ) Therefore, if the arrester tank diameter is the same in Figure 3 and Figure 5, the distance between the tank and element is larger in Figure 5, where the element part is smaller, so the ground static The capacitance is reduced, and voltage sharing between elements is improved.

According to the present invention as described above, there are the following effects.

(i) If the tank diameters are the same, potential sharing can be improved.

(ii) If the potential sharing is the same, the tank diameter can be made smaller.

[Brief explanation of the drawing]

Figures 1 and 2 are a plan view and a front view of a 420KV surge arrester element array, Figure 3 is a UHV surge arrester element array diagram, Figure 4 is a perspective view of Figure 3, and Figure 5 is a diagram showing one example of the present invention. FIG. 3 is an element arrangement diagram according to an example. A, B, C, D... Column, a, b, c, d... Block, 1... Element, 2... Insulator, 3... Connection conductor.

Claims (1)

[Claims] 1 Blocks in which elements and insulators are stacked are arranged in parallel in a metal container, and the elements of multiple blocks are electrically connected in series in a spiral shape to form one column, and the multiple columns are electrically connected in series. The lightning arresters are arranged concentrically in parallel to each other, and the number of columns and the number of blocks are the same, the arrangement of blocks in each column is the same, and the same corresponding blocks are arranged in opposing parts of each column. Zinc oxide type lightning arrester.