JPH0113368Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a gear press arrester using a zinc oxide element, and more particularly to a gear press arrester with improved internal assembly and explosion-proof structure.

[Technical background of the invention]

Lightning arresters have the most severe responsibility as a protective device for other power equipment. For example, the arrester must bear the load from other unforeseen disturbances such as a direct lightning strike, and must protect other equipment even if the arrester itself is damaged. For this reason, the standards allow lightning arresters to be damaged and specify the conditions of such damage.

FIGS. 1 and 2 show the cross-sectional and planar configuration of a conventional gear press arrester.
This lightning arrester 1 houses an internal element 3 configured by stacking a required number of zinc oxide elements in a porcelain insulator tube 2,
Both ends of the insulator tube 2 are hermetically sealed. This zinc oxide element 3 is constructed by tightening insulating rods 5 between plates 4 provided at the top and bottom, respectively.

On the other hand, due to overload, the internal element 3 may be damaged due to thermal runaway or the like, and a ground fault current may flow into the arrester 1, causing the internal atmosphere 6 of the arrester to become high temperature and high pressure due to the energy. Therefore, in order to release the energy to the outside and prevent the explosion and scattering of the surge arrester 1, the sealing of the surge arrester 1 is carried out by using a pressure relief membrane 7, which operates at a pressure lower than the failure pressure of the insulator tube 2, with a packing 8, a holding plate 9, and a stopper. It is fixed with a plate 10, and the inside of the insulator tube 2 of the lightning arrester 1 is hermetically sealed.

However, when an arc occurs inside the lightning arrester 1, even if only the pressure caused by the arc is released through the pressure relief ports 11 provided in the holding plate 9 and the backing plate 10, the insulator tube 2 may be damaged due to uneven heat. Therefore, in recent years, in order to prevent this, between the internal element 3 on the inner surface of the insulator pipe 2,
A cylindrical plate 12 for cooling is inserted. Further, the lightning arrester 1 is constructed so that the generated arc is quickly guided to the outside of the arrester and flashed externally. 13 is an arc guide for this purpose.

The cylindrical plate 12 for cold heating is made of silicon glass cloth, for example, and is inserted into the inside of the insulator tube 2 after being rolled up one or more times, so its plate thickness is about 1 mm. Further, the spring 14 is for mounting the internal element 3 into the insulator tube 2.

[Problems with background technology]

However, as mentioned above, this type of conventional gear press lightning arrester has a relatively complicated internal assembly structure, and since it has an explosion-proof structure, the structure is even more complicated, which makes the device less reliable and economical. There are problems with this.

[Purpose of invention]

The present invention was developed to solve the above-mentioned problems, and its purpose is to provide a gear press lightning arrester that can simplify the equipment configuration and prevent uneven heat destruction of the container during burnout. It is in.

[Summary of the idea]

In order to achieve the above object, the present invention uses a cylindrical body with a wavy cross-section as a heating cylinder inserted between the container and the internal elements housed in the container, and the wavy surface is inserted into the container. It is characterized in that it is arranged so as to be in contact with and in circumferential contact with the internal element, so that it has both a thermal function and a function of fixing the internal element.

[Example of idea]

An embodiment of the present invention shown in the drawings will be described below. 3 and 4 show cross-sectional and planar configuration examples of the gear press arrester according to the present invention, and the same parts as in FIGS. Now, I will only discuss the different parts.

That is, this gear press arrester eliminates the plate 4 and insulating rod 5 in Figs. 1 and 2, and
In addition, the cylindrical plate 12 for cooling and heating is made to have a wave-shaped cross section 12', one wave surface of which is inscribed in the inner wall of the insulator tube 2, and the other wave surface is circumscribed to the outer surface of the internal element 3. It is arranged and configured as follows. In addition, Fig. 5 shows Honshiya heating cylindrical plate 1.
2' shows the expanded shape.

With a gear press lightning arrester having such a configuration, the internal element 3 can be fixed within the insulator tube 2 by the cylindrical plate 12', so it is not necessary to use the plate 4 and the insulating rod 5 when attaching and fixing the internal element 3 as in the conventional case. This becomes unnecessary, and the internal assembly configuration can be simplified accordingly. In addition, when this lightning arrester burns out, the wavy cylindrical plate 12' will come into close contact with the inner wall of the insulator tube 2 due to internal pressure.
can be reliably prevented from uneven heat damage. As a result, it is possible to provide a gear press lightning arrester having a structure that prevents uneven heat destruction of the insulator tube 2 while simplifying the structure and improving reliability and economical efficiency.

Incidentally, in the above embodiment, a porcelain tube was used as the container, but a tank or the like may also be used.

Moreover, although silicon glass cloth is used for the cylindrical plate 12' for heating, epoxy glass cloth may also be used.

In addition, the present invention can be implemented in various forms without changing the gist thereof.

[Effect of idea]

As explained above, according to the present invention, a cylindrical body with a wavy cross-sectional shape is used as a heating cylinder inserted between the container and the internal element, and the wavy surface is arranged so as to be in contact with the container and the internal element. Therefore, it is possible to provide a highly reliable and economical gear press lightning arrester that can reliably prevent uneven heat destruction of the container during burnout while simplifying the equipment configuration.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional gear press arrester, Fig. 2 is a partial sectional view taken along line A-A in Fig. 1, Fig. 3 is a sectional view showing an embodiment of the present invention, and Fig. 4 is a sectional view showing a third
FIG. 5 is a perspective view showing the cylindrical plate in FIG. 3 or 4. FIG. 1... Gear press lightning arrester, 2... Insulator tube, 3...
...Internal element, 7...Pressure membrane, 8...Packing, 9
... Pressing plate, 10 ... Backing plate, 11 ... Pressure release port,
12, 12'... Cylindrical plate for heating, 13... Arc guide, 14... Spring.

Claims (1)

[Scope of utility model registration request] In a lightning arrester, an internal element constituted by stacking a required number of zinc oxide elements with excellent nonlinearity is housed in a container, and a heating cylinder is inserted between the internal element and the inner wall of the container, A gear press lightning arrester characterized in that the cylindrical body has a wave-like cross-sectional shape in the axial direction, and the wave surface is arranged so as to be inside the inner wall of the container and to be outside the outer surface of the internal element.