JPS6098602A - Arrester - Google Patents

Abstract

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

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to the construction and arrangement of zinc oxide type lightning arresters provided for the protection of power transmission lines.

[Technical background of the invention and its problems]

In recent years, zinc oxide type lightning arresters, which have characteristics mainly composed of zinc oxide, have been able to significantly improve their performance, be smaller, and be lighter in weight. It has become possible to install lightning arresters directly on long-distance power transmission lines for purposes such as preventing ground faults on the transmission line.

In this way, lightning arresters have traditionally been installed on power transmission lines as shown in Figure 1. In the diagram, the power transmission line (1) is connected to the tower (2)
A plurality of suspension insulators 5a) are connected to the steel tower arm (3) to form a V-shaped suspension insulator chain (5), and the power transmission line (1) is suspended by this V-shaped suspension insulator chain (5). , this power transmission line (1) is stretched at a position higher than the ground. Therefore, it is frequently affected by natural lightning, and power transmission lines (
1) An overhead ground wire (6) is provided for the purpose of maintaining H (I!).

However, it is impossible to eliminate all natural lightning using an overhead ground wire (6), and it is extremely difficult to remove all natural lightning with a suspended insulator (5).

The above potential difference may occur between the power transmission line (11) and the steel tower (2), causing a ground fault in the power transmission line (1).When a ground fault occurs in this way, an excessive ground fault current flows in the power transmission line. This will cause the power lines to trip.

In order to prevent such inconveniences, lightning arresters are installed on power transmission lines to prevent ground faults in the power transmission lines. Zinc oxide type lightning arresters utilize the non-linearity of zinc oxide elements; when the voltage applied to both ends of the arrester increases, current flows; when the applied voltage decreases, current no longer flows.

In other words, it only operates when there is an abnormal voltage, so after absorbing the natural lightning energy, the power transmission line is disconnected from the ground potential, and then the transmission line is disconnected from the ground potential. 0: Works to prevent line tripping.

By the way, such a lightning arrester (7) is arranged between the V-shaped suspension insulators (5). That is, the lightning arrester (one side of the power is connected to the power transmission line (1) and the other side is connected to the steel tower (2). When the lightning arrester (7) is arranged in this way, the power transmission line (1), the suspension shield 5a) and the lightning arrester ( The power will be exposed to wind and rain.If you connect the lightning arrester (power) in a straight line like this,
Because the straight line distance where the lightning arrester (7) is installed is short compared to the length of the suspended insulator chain (5), the lightning arrester (7) pipe table ■1
1 lacks strength against contamination, and there is a risk of external surge of force occurring in the lightning arrester.

[Purpose of the invention]

The present invention has been made in consideration of the above points, and its purpose is to provide a stable lightning arrester with improved stain resistance.

[Summary of the invention]

In order to achieve such an object, according to the present invention, a power transmission line is suspended from a steel tower through a V-shaped insulating support member chain in which a plurality of insulating support members are connected in series, and a characteristic element mainly composed of bent lead oxide is used. It is housed inside an insulator tube, and both ends of this insulator tube are sealed through a cover plate having a connection part to form a lightning arrester unit;
By arranging a plurality of lightning arrester units in series between the transmission line and the steel tower in a zigzag pattern between both sides of the V-shape through the connection points between both sides of the series of insulating support members formed in the shape of a V-shape. , to improve stain resistance.

[Embodiments of the invention]

An embodiment of the lightning arrester of the present invention will be described below with reference to FIGS. 2 and 3. In Fig. 2, a characteristic element formed by stacking multiple non-linear elements (13g) containing zinc oxide as a main component is housed inside the 1iF detonator 0υ shell tube, and is sealed by a lid plate (L9). This lid plate a9 is provided with a connecting fitting (161) having, for example, a connecting hole (161), which serves as a connecting portion.

In Figure 3, the tower arm of the steel tower is connected to the V-shaped insulating support member (by which the transmission line 0D is suspended, and the ■-shaped insulation I21).
A lightning arrester (2) is configured by connecting in series between the two.

For example, a V-shaped insulating support member chain is formed by connecting a plurality of suspension insulators e2:(l in series) to form a suspension insulator chain (c).

This suspension insulator chain (C) is formed into a v shape with two sides, and V
The open side of the shape is on the tower arm side, and the closed side of the V shape is before transmitting power! Hang (21).

Then, by using the connection part (c) of the suspension insulators forming the Q-shaped suspension insulator series Q, a plurality of lightning arrester units <11) are connected in series so that there is 1 zigzag between both sides of the V-shape. do. In other words, in the diagram, from the power transmission line Cυ side, lightning arresters (1, 2, 3, 4, and 5) are arranged in a zigzag pattern on both sides in the order of 1, 2, 3, 4, and 5 to connect the power line ψυ and the tower arm (a). are connected to m series to form two lightning arresters.

Next, the effects of the lightning arrester of the present invention will be explained. As mentioned above, the overall length of the surge arrester 92 formed by arranging a plurality of surge arrester units (!1) in a zigzag pattern is sufficient compared to the length of one side of the V-shaped suspension insulator chain (c). Because it can be formed as long as possible, the lightning arrester (
A) provides sufficient insulation strength against contamination. In addition, if the potential difference between the tower and the transmission line caused by a lightning strike becomes greater than the insulation strength of the suspension insulator chain (c), the lightning arrester (according to the characteristics of An excellent lightning arrester can be obtained from the viewpoint of insulation coordination, such as being able to remove the potential difference and return to the normal transmission line 11.1.

Although a suspension insulator has been described as the insulating support member, it goes without saying that the insulating support member may be a long pipe insulator or a combination of both.

Furthermore, in the illustration, the connecting portions between the suspension insulators are connected in a zigzag manner for every same number of suspension insulators, but the insulation distance to the steel tower can be increased at locations where there are a large number of lightning arresters.

〔Effect of the invention〕

As explained above, according to one embodiment of the lightning arrester of the present invention, a plurality of JI M S
By connecting the units in a zigzag pattern and in series between the tower and the power transmission line, it is possible to provide a lightning arrester with excellent stain resistance. ?

[Brief explanation of drawings]

Fig. 1 is a front view showing the arrangement of a secondary arrester, Fig. 2 is a partially sectional front view of a surge arrester unit constituting the arrester of the present invention, and Fig. 3 is a front view showing the arrangement of the arrester of the present invention. Correct ■11
It is a diagram. (II)...Surge arrester unit, 0 line...Pipe, (13
)...Characteristic element, (13a)...Nonlinear element whose main component is zinc oxide, θ...root, aO...connecting fitting, (a)...steel tower arm, CJll...・Shipping? 1, 1 line, (2)...surge arrester, Q31...suspension insulator, (c)...suspension insulator, eO9, connection section, agent patent attorney Inoue-male No. 1 Figure 2 Figure 1 Mua Figure 3?l

Claims (1)

[Claims] A power transmission line is suspended from a steel tower by forming a V-shaped insulation support member formed by connecting a plurality of insulation support members in series, and a lightning arrester is disposed between the power transmission line and the steel tower. The above-mentioned V
A lightning arrester characterized in that a plurality of the JII electric appliance units are connected in series in a zigzag manner between both sides of the V-shape, and are arranged in the insulating support part having a shape of an insulating support part.