JPS5935996Y2 - Lightning arrester - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lightning arrester, and particularly relates to an improvement of a gas filling port.

BACKGROUND OF THE INVENTION Conventionally, lightning arresters have played an important role in protecting power equipment from abnormal surges generated in power systems due to lightning or system opening/closing operations.

Such a lightning arrester houses an internal element consisting of a series gap and a characteristic element in a shell tube, and the upper and lower sides of the shell tube are sealed by a pressure-retaining membrane and a holding plate.

A sealing port 17 is provided inside the lightning arrester to seal dry air or dry nitrogen as shown in FIG. A backing 16 is provided between the pressure membrane 14 and the sealing port 17, and the sealing port 17 is hermetically sealed with, for example, solder 18.

In addition, the pressure relief membrane 14 is provided to prevent the lightning arrester from being able to cut off the current due to an excessive surge and to prevent the tube 11 from exploding and scattering due to the increase in internal pressure. Thickness of lead etc. 0.1
It is formed from an extremely thin metal member of about 1 mm.

It is extremely difficult to make a hole in this thin pressure-reduction membrane and pass the sealing port through it, and cracks and pinholes are likely to occur in the pressure-reduction membrane, and it is difficult to maintain airtightness by providing a backing between the sealing port and the pressure-reduction membrane. There are some drawbacks such as difficulty.

The object of the present invention has been made in view of the above points, and is to provide a reliable lightning arrester that is easy to work with and maintains airtightness without providing holes in the pressure-retaining membrane.

Hereinafter, the present invention will be explained with reference to the embodiments shown in FIGS. 2 to 4.

The same parts as in FIG. 1 are given the same symbols.

As shown in FIG. 2, an internal element 12 consisting of a series gap 12a and a characteristic element 12b is housed inside the insulator tube 11, and a pressure relief membrane 14 and a presser plate 15 are placed in the upper part via a backing.
An upper lid 13a is provided, and a sealing inlet plate 20, an escape pressure membrane 14, a presser plate 15, and a lower lid 13b are provided at the bottom via a backing, and a stand 19 is attached to the lower lid.

As shown in FIG. 3, the sealing port plate 20 is tightly sealed with a presser plate 15 (not shown) via the gas pipe and the backing 16, and also via the pressure-evacuation membrane 14 and the backing 16.

As shown in FIG. 4, this enclosure plate 20 is provided with a pressure release port 21 and an injection port 22 that communicates with the pressure release port 21 in the radial direction of the plate 20. sealed by.

Further, the presser plate 15 is also provided with a pressure release port 24. As described above, according to the present invention, there is no need to provide a hole in the pressure protection membrane 14, and the overall length of the lightning arrester can be made smaller.

On the other hand, there are also advantages from a manufacturing standpoint, such as unifying the backing and reducing the number of parts.

As described above, according to the present invention, the pressure relief membrane is communicated with the pressure relief port provided in the sealing port plate by providing the filling port in the radial direction of the thickness of the plate from the circumferential side of the sealing port plate. It is possible to provide a reliable lightning arrester that is easy to work with and maintains airtightness without providing holes.

[Brief explanation of drawings]

Figure 1 is a new view showing the main parts of a conventional lightning arrester, Figure 2 is a vertical sectional view showing the surge arrester of the present invention, and Figure 3 is a new view showing the main parts of the surge arrester of the present invention. Figure 4 shows IV- shown in Figure 3.
FIG. 3 is a plan view taken along the line IV. 11... Insulator tube, 12... Internal element,
13a, 13b...Top, bottom lid, 14...
・・Pressure membrane, 15・・Press plate, 16・・・・
・Backing, 20... Enclosure opening plate, 21.24
...Discharge port, 22...Enclosure port.

Claims (1)

[Scope of utility model registration request] In a lightning arrester in which an internal element is housed in a paddle tube, a pressure relief film and a pressure relief membrane are provided at both ends of the tube, and a gas sealing port is provided at one end of the tube, a sealing port plate is attached to one end of the tube through a backing. and a presser plate provided with a pressure relief membrane and a pressure relief port for pressing the pressure relief membrane through a backing on the sealing port plate, and communicating with the pressure relief port provided in the sealing port plate; A lightning arrester characterized in that a filling port is provided in the radial direction of a filling port plate.