JPS59222902A - 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 a gapless lightning arrester whose internal elements are formed by stacking agglomerated salivary lead-based nonlinear resistors, and particularly relates to a gapless lightning arrester with improved heat dissipation characteristics. .

[Technical background of the invention and its problems]

Gear brace arresters are directly connected to the electric power system, and leakage and current constantly flow through them.The zinc chloride non-surface wire resistor, which is an internal element of the arrester, heats up due to the leakage current and the temperature rises. rises. The temperature also rises when surge energy is absorbed. It is known that a rise in temperature affects the energized lifespan of a nonlinear resistor, and that the higher the temperature, the shorter the lifespan. Other non-linear resistors? The -L characteristic has a high dependence on temperature in the low current region, and the resistance value decreases as the temperature rises. For this reason,
If the temperature rises above the 9 limit due to absorption of surge energy, the amount of heat generated by subsequent electricity application may exceed the amount of heat dissipated, leading to thermal runaway.

Therefore, in a gapless lightning arrester, it is desirable to improve the heat dissipation characteristics and suppress the temperature rise of the resistor.

As shown in FIG. 1, a conventional lightning arrester has a plurality of zinc oxide non-linear resistors 2 stacked inside an insulator tube 1, and a metal electrode 3a on top of the stack 3.

It houses an internal element 4 formed by arranging 3b. The openings at both ends of the insulator tube 1 are each closed by metal plates 5.6. A spring 7 and a spacer 8 are arranged between the metal plate 5.6 and the internal element 4, and the internal element 4 is pressed and electrically connected by these. However, in a lightning arrester with such a configuration, the heat generated in the internal element 4 is transferred via the spring 7 and the spacer 8 to the metal plate 5. It was released outside due to convection phenomena inside the shrine. For this reason, in conventional lightning arresters, when a normal ground voltage is applied, the temperature of the element increases by several tens of degrees Celsius due to a large leakage current. Figure 2 shows the temperature conditions at the top, middle, and bottom of the internal elements when a normal ground voltage is applied to the arrester and the resistor temperature rises and becomes constant. This figure shows that due to the convection of the gas inside the M escaper, the gas temperature inside the insulator on the upper side becomes higher than the gas temperature on the lower side, so the warm seam in the upper part is more stable than in other parts f+. You can see that it has changed. Therefore, the lifetime of the lightning arrester %
Note: In order to improve the thermal runaway limit, it was necessary to improve the heat dissipation structure.

2(a) and (bl) are a plan view and a side sectional view of a conventional shield 45 with improved heat dissipation characteristics. In the figure, silicone rubber 11 is installed around the non-linear resistor 2. , a part of the silicone rubber 11 is in direct contact with the inner surface of the insulation board 1 through the rubber ball 12.The heat generated in the internal element 4 is transmitted to the insulation board 1 via the rubber ball 12. However, in such a configuration, the pressure applied to the internal element 4 is also constantly applied to the silicone rubber 11, leading to the problem of premature deterioration of the silicone rubber 11. Ta.

[Purpose of the invention]

The present invention has been made in consideration of the above points, and its purpose is to provide a gapless surge arrester that improves the heat dissipation characteristics of internal elements, suppresses thermal runaway, and improves the charging life characteristics. Koto V Kochiru.

[Summary of the invention]

In order to achieve such an object, the present invention provides a capless lightning arrester in which an internal element formed of a plurality of zinc oxide non-direct resistors is housed in a cylindrical sealed container. A thermally conductive elastic insulator is disposed between the upper end surface of the element and the inner surface of the cylindrical closed container facing the upper end surface.Example: Hereinafter, an example of the present invention will be described with reference to the drawings. and explain. In FIG. 4, an upper metal electrode 3a and a lower metal electrode 3b are arranged on the top and bottom of a laminate 3 formed by stacking a plurality of non-linear resistors 2 that do not contain zinc oxide, and internal elements are 4
form. The internal element 4 is fixed within the insulator tube l using an insulating rod 14, a diagonal 5, and an insulating plate 16. However, on the upper part' polarization side, the stacked body 3 is directly pressed by the upper metal electrode 3a without using the nut or the P2 edge plate. A spring 7 is installed as a shock absorber only between the upper metal electrode 3a and the opposing surface of the upper metal plate 5 that closes the upper end surface of the metal electrode 3a and the upper end opening of the insulator tube 1.
Silicone rubber 17 is provided. Below the lower metal electrode 3b, an upper metal electrode 11ii3a is provided with a metal spacing 8.
The upper side and the lower side of the metal spacer 8 are fixed to the insulator and are 72 inches 9.10 [*! Upper metal plate 5 attached to D
, is pressed down by the lower metal plate 6.

A pressure relief plate 18 and an upper valve plate 19 are provided above the upper metal plate 5 and are identified to the shift flange 9 by a P1 bolt 20. Similarly, a pressure relief plate 21 and a lower valve plate 22 are provided on the lower side of the lower metal plate 6, and are fixed to the 7 flange 10 by bolts 23Vc. The upper metal plate 5 and the lower metal plate 61C are provided with arc escape ports 5a and 6a, respectively.

The heat generated in the internal element 4 is smoothly transferred to the flange 9 through the recon rubber 17 and the upper metal plate 5, and is cooled by the outside air on the outer surface of the upper metal plate 5 and the flange 9. FIG. 5 shows the temperature rise in the upper, middle, and lower parts of the internal element 4 in the arrester of the present invention when normal ground pressure is applied to the arrester and the element temperature is constant. As shown in this figure, the temperature in the valley is almost the same, and the temperature rise is smaller than in the case of the conventional lightning arrester shown in FIG. As mentioned above, the normal coining force against the ground is not limited to the current state, and the rise in the internal *elementary IR=U when absorbing the surge voltage entering from the line is also cooled by the outside air due to the above-mentioned action, and as a result, Thermal runaway limit temperature becomes much higher.

In addition, since the applied voltage does not change to the silicone rubber, early deterioration of the silicone rubber is eliminated.

By improving the heat dissipation characteristics as described above,
Since deterioration of the element due to heat is suppressed, long life characteristics are improved, and thermal stability after absorption of surge current is also improved.

(Effects of the Invention) As explained above, according to the present invention, the temperature rise of the internal bag element can be effectively suppressed, deterioration due to heat can be stopped, and thermal stability characteristics and surge discharge capacity can be improved. Therefore, the reliability of the lightning arrester can be improved.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional surge arrester, Fig. 2 is a block diagram of a conventional surge arrester with improved heat dissipation characteristics, Fig. 3 is a diagram of the internal temperature state of a conventional surge arrester, and Fig. 4 is a diagram of a conventional surge arrester according to the present invention. FIG. 5 is a block diagram of the lightning arrester according to the embodiment, and is a state diagram of the internal temperature range of the lightning arrester according to the present invention. 1. Insulator tube 2. Non-linear resistor 4. Inner s
e Jf= 11, 17...Silicone rubber 1st
Figure 2 (O-9 (b) Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] In a gear-socket lightning arrester comprising an internal element formed by laminating a plurality of zinc oxide non-linear resistors in a cylindrical sealed container, an upper end surface of the internal element and the cylindrical seal facing the upper end surface; A gapless lightning arrester characterized by placing a thermally conductive elastic insulator only between the inner surfaces of the container.