JPH0351908Y2 - - 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 houses the main system in which circuit breakers, disconnectors, voltage transformers, current transformers, etc. are connected by wiring and connection bus bars, etc., and is filled with an insulating gas such as SF ₆ gas. A lightning arrester is installed to electrically protect this 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, open it from the outside of the cubicle wall, take out the internal elements, and then perform a withstand voltage test after disconnecting the arrester from the main system. 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 filled with insulating gas inside the cubicle for insulation purposes. Furthermore, when the internal elements were pulled out as described above, there were other problems that needed to 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 that can be housed and installed 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,
An opening on one side is opened from the cubicle wall to the outside,
a first container with the other side located inside the cubicle; a second container that stores the characteristic element stored inside the first container; and a closure part that seals the opening of the first container. A movable electrode that is slidably inserted through the inner end of the cubicle of the first container and is provided so as to come into contact with and separate from the fixed electrode of the main body system, and a movable electrode that is provided so as to come into contact with and separate from the fixed electrode of the main body system; By providing a valve part at the inner end of the cubicle of the second container, which opens when the second container is stored and closes when the second container is pulled out, the withstand voltage of the cubicle is increased when the second container is pulled out. The present invention is characterized in that the test can be easily performed and the second container can be inserted to restore the system easily. Preferably, the first container and the second container are each formed by an insulating tube.

[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 in which circuit breakers, disconnectors, voltage transformers, current transformers, etc. are connected by connection wires and connection buses is housed, 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 drawing 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 with a ground terminal part 18 via a flange part 13 on the outside of the cubicle. The closed portion 20 is formed by attaching it in this manner. Further, a movable electrode 22 of a disconnector 21 is provided on the end plate 19 provided on the side opposite to the side where the lightning arrester container 15 is attached to the cubicle wall 11, and which is airtightly inserted through a sliding packing 19a and serves as a disconnector. This disconnection section 21 is connected to the movable electrode 2
2, and a fixed electrode 23 that faces this and is fixed to the main body system, and this fixed electrode 23 has a contactor 2.
3a is provided. 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 section 16 is housed inside the lightning arrester container 17, the tip of the columnar section 31a is inserted into the contact fitting 28 so as to be in contact with the contact fitting 28 via the contact 28a.

An end plate 29 is provided on the side of the internal element portion 16 facing the spring seat 26, and a valve portion 30 is formed inside the internal main portion 16 of the end plate 29. The valve part 30 is the valve body 3
1, a valve seat 32, and a compression spring 33. Valve body 3
1 consists of a columnar portion 31a and a disk-shaped spring receiver 35, and is formed to have a T-shaped cross section. A valve seat 26 is provided between the inside of the end plate 29 and the spring receiver 35, and the columnar portion 31a
is inserted through the insertion hole of the valve seat 36, and when the internal element portion 16 is housed inside the lightning arrester container 15, the tip of the columnar portion 31a comes into contact with the contact fitting 28 inserted into the recess of the end plate 29. Child 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 accommodated, 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, thereby forming the closing part 20. The other end of the insulating member cylinder 40 is formed flush with the surface of the flange 13b. The insulating member cylinder 40 is airtightly held by a spacing fitting 42 with a packing 42a interposed between the end face of the insulating member cylinder 40 and a packing 42b interposed between the flange 13b and the flange 13b. Further, the ground terminal portion 18 is airtightly attached to the spacer fitting 42 via a packing 42c.

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 13b 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 internal element part 1 can be pulled out with a still enclosed,
The characteristic element 16a of No. 6 is not exposed to the atmosphere, so that there is no change in the characteristic element 16a that would deteriorate the 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 disconnecting portion 21 opens.

As described above, when the inside of the lightning arrester container 15 is empty, if 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 portion 21 is opened. 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 the internal element part is provided with a valve. established,
By configuring the valve part to open when the internal element part is housed inside the lightning arrester container and to close the valve part when the internal element part is pulled out, after the internal element part is pulled out from the opening side, the inside of the cubicle The withstand voltage test of the main body system can be easily performed without leaking the insulating gas, and the characteristic elements stored in the internal element are not exposed to the atmosphere, and the internal element can be stored through the opening of the lightning arrester container. By doing so, it is possible to provide a lightning arrester that can be easily restored.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of the lightning arrester of the present invention, Figure 2 is an enlarged vertical cross-sectional view of the main part of Figure 1, and Figure 3 is a cross-sectional view showing the internal element part of Figure 2 in the middle of being pulled out. , FIG. 4 is a sectional view showing the open state of the disconnection section after the internal element section of FIG. 3 is pulled out. 11... Cubicle wall, 11a... Insulating gas, 12... Lightning arrester, 13... Flange portion, 14
. . . Opening, 15 . . . Lightning arrester container, 16 .
1... Disconnection section, 30... Valve section, 39, 40... Insulating member cylinder.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a lightning arrester provided to protect the main body system housed inside a cubicle filled with insulating gas, an opening on one side is opened to the outside from the cubicle wall and the other side is opened to the outside from the cubicle wall. a first container located inside the cubicle; a second container accommodating a characteristic element stored inside the first container; a closing part sealing an opening of the first container; a movable electrode that is slidably inserted through the inner end of the cubicle of the first container and is provided so as to come into contact with and separate from the fixed electrode of the main body system; A lightning arrester having a valve section provided at an inner end of a cubicle of a second container that opens when the second container is stored inside and closes when the second container is pulled out. (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 formed from a nonlinear resistor element.