JPS637006B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gear press arrester, and more particularly to a gear press arrester that improves the cooling effect of gear press arrester elements.

The main element of the gear press arrester is made of a semiconductor whose main component is ZnO. Therefore, the lifespan of gear press arrester elements (hereinafter abbreviated as elements) is greatly influenced by the temperature under which they are used. That is, the lower the temperature of the element used, the longer the life of the element, the higher the rate of charge (in the case of applied voltage), and the smaller the arrester itself. Therefore, it is desirable for the gear press arrester to efficiently dissipate the amount of heat generated from the elements used, and to suppress the temperature rise of the elements to a low level.

As shown in FIG. 1, the conventional gear press arrester has elements 1 stacked in series that are fitted into an insulator 2 with a gap between them, with a gap between the inner wall surface of the insulator 2 and the element 1. It is filled with a gaseous refrigerant such as nitrogen or _SF6 . Then, the amount of heat generated in the element 1 is dissipated into the refrigerant 3 sealed in the insulator 2,
Furthermore, the heat is radiated to the outside air through the insulator 2. In this case, the amount of heat dissipated from the element 1 is generally very small, but since the overall thermal resistance is large, the temperature rise cannot be ignored. In particular, in the case of the configuration shown in FIG. 1, the heated refrigerant 3 rises on the surface of the element 1, and the cooled refrigerant 3 descends on the inner wall surface of the insulator 2. At this time, since the rise and fall of the refrigerant intersect in the narrow space between the inner wall surfaces of the element 1 and the insulator 2, the convection resistance becomes large, the circulation of the refrigerant becomes difficult to occur, and the vertical temperature gradient becomes large. Furthermore, since the convection velocity of the refrigerant on the surface of the element 1 and the inner surface of the insulator 2 is slow, the heat transfer coefficient of the surface becomes small, resulting in an increase in temperature of the refrigerant 3 and the element 1. As a result, the temperature gradient A of the element 1 and the temperature gradient B of the coolant 3 become as shown in FIG. 2, and the temperature difference Δθ
The lifetime of the element 1 is determined by the maximum temperature θmax at the top of the element 1, and the charging rate must also be based on this temperature θmax.

An object of the present invention is to provide a gear press arrester that can improve the temperature distribution and lower the maximum point temperature θmax of the element.

FIG. 3 shows an embodiment of the present invention.
The difference between this figure and FIG. 1 is that the stacked elements 1 are divided into a plurality of blocks along the axial direction, and a partition plate 5 is inserted between each block to create a gap between the insulator 2 and the element 1. It is divided into multiple rooms.

With such a configuration, convection of the refrigerant between the rooms partitioned by the partition plate 5 can be suppressed, the refrigerant 3 convects in each room, and heat transfer of the refrigerant 3 between adjacent rooms is suppressed. Therefore, the upper element 1 is not affected by the heat dissipation of the lower element, and the temperature distribution becomes such that the maximum point temperature θmax of the element 1 is reduced as shown in FIG.

In particular, the higher the rated voltage of the gear press arrester, the more the number of stacked elements 1 becomes.
When the total amount of heat generated from the element 1 is inevitably large and the refrigerant near the top is affected by many elements at the bottom, the partitioning of the refrigerant 3 by the partition plate 5 has a remarkable effect of reducing the maximum point temperature θmax. become.

FIG. 5 shows another embodiment of the invention. Some of the heat generated from the elements inside the insulator is transferred to the refrigerant inside the insulator, and then from the refrigerant to the inner surface of the insulator.In addition, some heat is transferred directly from the surface of the element to the inner surface of the insulator as radiant heat. There is also a lot of heat. This embodiment is effective in absorbing radiant heat. That is, in the case of radiation, the radiation coefficient varies greatly depending on the surface roughness of the surface of the element 1 and the inner surface of the insulator 2, and the color.

Generally, the inner surface of the insulator is white and has an extremely smooth surface, but in this embodiment, along with the installation of the partition plate 5, the inner wall surface 21 of the insulator 2 is made to be a rough surface.
By making this rough surface black or a color close to black, the radiation coefficient is increased, the amount of heat transferred by radiation is increased, the cooling efficiency is increased, and the temperature of the element 1 is kept lower.

As explained above, the present invention can improve the heat dissipation effect of the element, reduce the temperature rise of the element, extend the life of the element, and increase the charging rate, and by extension, improve the overall arrester. Can be made smaller.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventional gear press arrester, Figure 2 is a graph showing the temperature characteristics of Figure 1,
FIG. 3 is a sectional view showing one embodiment of the present invention, FIG. 4 is a graph showing the temperature characteristics of FIG. 3, and FIG. 5 is a sectional view showing another embodiment of the invention. 1... Gear press arrester element, 2... Insulator, 3... Refrigerant, 5... Partition plate.

Claims (1)

[Scope of Claims] 1. A gear press arrester element fitted with a gap between an insulator and an inner wall of the insulator, and a gap between the gear press arrester element and the insulator in the axial direction of the gear press arrester element. A gear press arrester comprising a partition plate that partitions into a plurality of chambers along the line, and a refrigerant sealed in the insulator, and suppresses heat transfer between the refrigerants partitioned by the partition plate. 2. The gear press arrester according to claim 1, wherein the insulator has a rough inner wall surface, and the rough surface is black or a color close to black.