JPH0351907Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a lightning arrester that is installed in a gas-insulated cubicle, can be taken out from inside the cubicle, and has a structure that facilitates withstand voltage testing of the gas-insulated cubicle.

[Technical background of the invention and its problems]

A gas-insulated cubicle is a cubicle that is filled with an insulating gas such as SF ₆ gas, which houses the main system, which includes circuit breakers, disconnectors, voltage transformers, current transformers, etc. connected by wiring and connection bus bars. A lightning arrester is installed to electrically protect the main system.

Conventionally, when conducting a withstand voltage test of a gas insulated cubicle at a factory or on-site, it was necessary to disconnect the lightning arrester from the main system, but such disconnection could result in a fairly complex structure. A possible solution would be to seal one end of the arrester to the cubicle wall and install it, open the arrester from the outside of the cubicle wall, take out the internal elements, disconnect the arrester from the main system, and then perform a withstand voltage test. be. However, when the internal elements are removed from the lightning arrester in this way, the elements that make up the internal elements absorb moisture, which deteriorates the element characteristics. Drying treatment is difficult, and there is a risk that the protection performance and long-term reliability of the lightning arrester will be significantly reduced. Further, when the internal elements are housed in the lightning arrester container, the inside of the lightning arrester container and the internal elements must be insulated filled with an insulating gas inside the cubicle. Furthermore, when the internal elements are pulled out as described above, there are other problems that must be solved, such as the need to prevent the insulating gas inside the cubicle from leaking to the outside.

[Purpose of invention]

This invention was made taking the above points into consideration.
The object thereof is to provide a lightning arrester housed and mounted inside a gas insulated cubicle so that a withstand voltage test of the gas insulated cubicle can be easily performed.

[Summary of the idea]

According to the present invention, in order to achieve this purpose,
a first container having an opening on one side opened to the outside of the cubicle wall and the other side disposed inside the cubicle side; a second container containing a characteristic element inserted and arranged inside the first container; a ground terminal portion that seals and closes the opening of the container; a movable electrode that is slidably inserted into the interior end of the cubicle of the first container on the side opposite to the opening of the first container; a disconnection section formed by the electrode and a fixed electrode arranged opposite to the electrode and fixed to the main body system,
A space between the movable electrode and the first container is such that the disconnection section closes when the second container is inserted into the first container and opens when the second container is pulled out from inside the first container. By constructing the structure with a compression spring, it is possible to conduct a withstand voltage test of the main body system from the opening side of the first container without exposing the characteristic elements stored inside the pulled out second container to the atmosphere. It is characterized by being easy to perform. Preferably, the first and second containers are formed by insulating tubes and the characteristic element is formed by a non-linear resistor element.

[Example of idea]

An embodiment of the lightning arrester of the present invention will be described below with reference to FIGS. 1 to 4. Inside the cubicle wall 11 of the gas-insulated cubicle (left side in the figure),
Although not shown, a main body system is housed in which circuit breakers, disconnectors, voltage transformers, current transformers, etc. are connected by connection wires and connection buses, and a lightning arrester 12 is provided to protect this main body system. The inside is filled with an insulating gas 11a such as SF ₆ gas. Note that the right side in the figure with the cubicle wall 11 as a boundary is the outside of the gas-insulated cubicle.

The lightning arrester 12 has a lightning arrester container 15 attached to the cubicle wall 11 through a flange portion 13 and having an opening 14 that opens to the outside of the cubicle wall 11.
and an internal element section 16 that is housed inside this through the opening 14. This internal element part 16 is formed by storing characteristic elements inside an internal element container 17, and one side of the internal element container 17 is sealed and closed by a ground terminal part 18 via a flange part 13 on the outside of the cubicle. Installed to do so. In addition, the cubicle wall 11 of the lightning arrester container 15
A movable electrode 22 of a disconnecting section 21 is provided on the end plate 19 provided on the opposite side to the mounting side thereof, and the movable electrode 22 is inserted airtightly through a sliding packing 19a and serves as a disconnecting switch. This disconnecting section 21 includes a movable electrode 22 and a fixed electrode 23 facing the movable electrode 22 and fixed to the main body system, and the fixed electrode 23 is provided with a contactor 23a. The movable electrode 22 has a movable contact 25 on one side of the rod 22a, a spring seat 26 on the other side, and a compression spring 27 between the spring seat 26 and the end plate 19. A contact fitting 28 is provided on the opposite side of the spring seat 26 from the compression spring 27.

Inside the internal element container 17, a characteristic element 16a formed by stacking a plurality of non-linear resistor elements having excellent non-linear characteristics mainly composed of a metal oxide such as zinc oxide is housed, and the internal element portion 16 is Form. And a spring seat 2 provided inside the lightning arrester container 17
The columnar portion 31a of the valve body 31 of the valve portion 30 is inserted into the end plate 29 of the internal element container 17 on the side opposite to the valve portion 6. When the internal element part 16 is housed inside the lightning arrester container 17, the tip of the columnar part 31a is inserted so as to be in contact with the contact fitting 28 via the contact fitting 28a.

An end plate 29 is provided on the side of the internal element portion 16 facing the spring seat 26, and the internal element portion 16 of this end plate 29
A valve portion 30 is formed inside. The valve portion 30 includes a valve body 31, a valve seat 32, and a compression spring 33. The valve body 31 includes a columnar portion 31a and a disk-shaped spring receiver 35, and is formed to have a T-shaped cross section. A valve seat 36 is provided between the inside of the end plate 29 and the spring receiver 35, and the columnar portion 31
a is inserted through the insertion hole of the valve seat 36, and when the internal element part 16 is stored inside the lightning arrester container 15, the tip of the columnar part 31a is inserted into the contact fitting 28 that has entered the recess of the end plate 29. Contactor 28a
Connected via contact. Further, the valve seat 36 is formed so as to be sealed or opened between the protrusion 36a formed on the valve seat 36 and the packing 35a provided on the side facing the spring receiver 35. Furthermore, spring receiver 35
A compression spring 33 that presses this spring receiver 35 is provided between and the characteristic element 16a.

The lightning arrester container 15 has flanges 37 and 38 fixed to both end sides of the insulating member cylinder 39, respectively, and is airtightly fixed to the end plate 19 by the flange 37 at one end of the insulating member cylinder 39 via a packing 37a.
Also, a packing 38 is provided at the other end of the insulating member cylinder 39.
flange part 1 by the flange 38 through a
The flange 13a on one side of 3 is airtightly fixed to the flange 13a.
Further, the flange 13a is airtightly attached to the cubicle wall 11 via packing 38b.

The internal element part 16 has an end plate 29 airtightly attached to one end of the insulating member cylinder 40 via a packing 29a to form an internal element container 17, and the valve part 3 is installed inside this internal element container 17.
0. The characteristic element 16a is housed, and the internal element 16a is pressed by the connecting fitting 41 and sealed by the ground terminal part 18 via the flange part 13. The other end of the insulating member cylinder 40 is formed flush with the surface of the flange 13b. Packing 42a is provided on the end surface of the insulating member cylinder 40.
and packing 42 on the flange 13b.
Airtightness is maintained by a spacer fitting 42 via b. Also, this spacer fitting 42 has packing 42c.
The ground terminal portion 18 is airtightly attached via the .

The ground terminal section 18 connects the ground terminal 43 to the insulating member 45.
one end of the ground terminal 43 is embedded in the insulating member 45.
The connecting fitting 41 is pressed by bending from approximately the center and protruding inside the insulating member cylinder 40, and the other end protrudes from the insulating member 45 and is grounded outside (not shown). The surface of the insulating member 45 is in airtight contact with the spacing fitting 42 via the packing 42c,
It is fixed to the spacer fitting 42 together with the insulating member 45 by the cover plate 46 . In addition, the cover plate 46 and the insulating member 45
There is a pressure relief hole 47 communicating with the inside of the internal element container 17.
A pressure relief membrane 47a is provided in the middle of this pressure relief hole 47.
will be established.

Next, the effects of the present invention will be explained. When performing a withstand voltage test on a gas insulated cubicle in a factory or on-site, the lightning arrester 12 must be disconnected from the main system. To do this, first, remove the spacer fitting 42 and the grounding terminal part 18 from the flange 13a of the flange part 13, and then pull out the internal element part 16 from the opening 14 of the lightning arrester container 15. When the internal element part 16 is pulled out from the lightning arrester container 15, the contact fitting 2 of the spring seat 26
The columnar part 31a of the valve body 31 comes out from the contactor 28a of No.8. When the columnar portion 31a is removed from the contact fitting 28, the valve portion 30 is closed. That is, the compression spring 33
The spring receiver 35 of the valve body 31 is pressed by this force.
When the spring receiver 35 is pressed, the packing 35a of the spring receiver 35 is pressed by the projection 36a of the valve seat 36, and the valve portion 30 is sealed. Initially, the valve portion 30 is open, so the insulating gas 11a inside the lightning arrester container 15 is in communication with the inside of the internal element container 17, but as the valve portion 30 is sealed as described above, the inner element container The insulating gas 11a can be drawn out to the outside of the cubicle wall 11 while being sealed inside the insulating gas 11a.

In this way, the insulating gas 11 is inside the internal element part 16.
Since the characteristic element 16a of the internal element portion 16 is not exposed to the atmosphere, the characteristic element 16a is not subject to changes such as deterioration of device characteristics due to moisture absorption or the like.

As will be described later, after the withstand voltage test of the main body system inside the cubicle, the internal element part 16 is inserted through the opening 14 of the lightning arrester container 15, and the flange 13b and the spacing fitting 42 are fixed, thereby changing the characteristics of the lightning arrester 12. It can be easily restored without any changes. Although the gas inside the lightning arrester container 15 is restored after restoration in this way, for example, the insulating gas 11a is released from the gas sealing port provided in the flange portion 13.
It can be replaced with and encapsulated.

Next, the operation of the disconnecting section 21 will be explained. When the internal element portion 16 is pulled out from the opening 14 of the lightning arrester container 15 as described above, the movable electrode 22 of the disconnection portion 21
and the fixed electrode 23 are separated. That is, the spring seat 26 is moved to the right in the figure by the compression spring 27. Along with this movement, the rod 22a moves to the right in the figure while being sealed by the sliding packing 19a, the movable contact 35 comes out of the contact 23a of the fixed electrode 23, and the disconnection section 21 opens.

As described above, with the inside of the lightning arrester container 15 empty, if, for example, an electrode for withstanding voltage test (not shown) is inserted from the opening 14 side and a voltage is applied to the spring seat 26, the disconnecting section 21 opens. It is possible to perform withstand voltage tests under various conditions. Further, the spring seat 26 is pressed against the compression spring 27 by the electrode for withstanding voltage test to close the disconnection section 21. That is, the movable electrode 22
The movable contact 25 of the fixed electrode 23 is connected to the contact 23a of the fixed electrode 23.
By supplying the power to the main body system inside the cubicle, the withstand voltage test of the main body system inside the cubicle can be easily performed.
In this way, the withstand voltage test can be performed while the insulating gas 11a inside the cubicle is sealed.

[Effect of idea]

As explained above, according to the present invention, the internal element part storing the characteristic elements in the internal element container housed inside the lightning arrester container can be freely pulled out or inserted from the opening side, and in this way, the internal element part drawer,
Alternatively, by providing a disconnection section that opens or closes as it is inserted, it is possible to easily conduct a withstand voltage test on the main body system without leaking the insulating gas inside the cubicle after pulling out the internal element from the opening side. Lightning arresters can be provided.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the lightning arrester of the present invention, FIG. 2 is an enlarged sectional view of the main part of FIG. 1, and FIG. 3 is a sectional view showing the internal element part of FIG. Fourth
The figure is a sectional view showing the open state of the disconnecting section after the internal element section of FIG. 3 is pulled out. 11...Kyubiguru wall, 11a...Insulating gas, 12...Surge arrester, 13...Flange part, 14
... Opening, 15 ... Lightning arrester container, 16 ... Internal element section, 16a ... Characteristic element, 17 ... Internal element container, 18 ... Ground terminal section, 19 ... End plate, 21
... Disconnection section, 30 ... Valve section, 39, 40 ... Insulating member cylinder.

Claims (1)

[Claims for Utility Model Registration] (1) In a lightning arrester provided to protect a main body system housed inside a cubicle filled with insulating gas, one side opening opens to the outside of the cubicle wall and the other side opens to the outside of the cubicle wall. a first container disposed inside the cubicle wall; and a second container accommodating a characteristic element inserted and disposed inside the first container.
a container, a ground terminal portion for sealing and closing the opening of the first container, and an end portion of the inside of the cubicle of the first container that is airtightly slid onto a side of the first container opposite to the opening. A disconnection section formed by a movable electrode that is movably inserted therein, a fixed electrode that is disposed opposite to the movable electrode so as to be able to move toward and away from it and is fixed to the main body system; When the container is inserted, the disconnection section closes,
A lightning arrester comprising a compression spring disposed between the movable electrode and the first container so that the disconnection section opens when the second container is pulled out from inside the first container. (2) The lightning arrester according to claim 1, wherein the first and second containers are each formed from an insulating member cylinder, and the characteristic element is a nonlinear resistor element.