JP2003180007A - Gas-insulated device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas-insulated device in which the number of fastening means, bolts and the like provided on flange parts is reduced. <P>SOLUTION: An insulating spacer 4, which supports a high-voltage conductor arranged inside a conductive container, is provided between two flange parts 1a, 2a provided at each connection end part of the conductive containers and arranged to face each other. A fastening mean 5 is passed through a through hole 8 provided in such a way as to penetrate from one side of the flange part through the other side of it via an insulating spacer so that the conductive containers are coupled to each other and insulating gas is filled inside. In this gas-insulated device, a surge-suppressing element 3 of a cylindrical shape is arranged in the through hole provided in the insulating spacer. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to, for example, a high voltage
The present invention relates to a gas insulation device that can be preferably used in a high-current type gas-insulated switchgear and the like, and more particularly to an improvement of a gas insulation device that has a surge suppressing element in a flange portion that connects conductive containers.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show, for example, Japanese Patent Laid-Open No. 10-164.
It is a block diagram which shows the gas-insulated switchgear as a conventional gas-insulated apparatus shown in Japanese Patent No. 713, etc., and FIG. 5 is an enlarged cross-sectional view showing the mounting structure of the surge suppression element provided on the same radius as the fastening means of the flange portion of FIG. In the figure, reference numerals 1 and 2 denote cylindrical conductive containers (gas tanks) having flange portions 1a and 2a at their connection ends. 4 is the above-mentioned 2 arranged facing each other
An insulating spacer interposed between the two flange portions 1a and 2a, which supports the high-voltage conductor 11 disposed in the central portion of the inside of the conductive containers 1 and 2 and also inside the conductive containers 1 and 2. Is partitioned.

Reference numeral 5 is a fastening means for fastening the flange portions 1a, 2a through an insulating spacer 4, and the bolt 5
a and a nut 5b. A large number of the fastening means 5 are provided at predetermined intervals in the circumferential direction of the flange portion. In addition to the high-voltage conductor 11, an insulating gas such as SF ₆ (sulfur hexafluoride) is sealed inside the conductive containers 1 and 2, and a circuit breaker, a disconnector, etc., not shown The switchgear and the like are properly arranged and housed.

3 is a zinc oxide non-linear resistor element (hereinafter referred to simply as "oxidation" unless distinction is required) as a surge suppressing element provided between the flange portions 1a and 2a having substantially the same radius as the fastening means 5. 3a and 3b are the zinc oxide element 3 and the flange portions 1a and 2a.
The electrodes, 12a and 12b, which are respectively interposed between, are screwed in from the outer surfaces of the flange portions 1a and 2a, and the tips of the electrodes press the electrodes 3a and 3b from the left and right,
It is a metal bolt that supports the zinc oxide element 3 between the flange portions 1a and 2a, and holds electrical connection. In addition, 6a is an insulating cylinder and 6b is an insulating seat, which electrically insulates the flange portion 2a and the fastening means 5.

In the gas-insulated switchgear configured as described above, even in a steady use state in which a large current is passed through the high-voltage conductor 11, due to the insulating effect of the insulating spacer 4, a plurality of large currents are generated. Between conductive containers, for example,
It is possible to prevent the generation of a so-called circulating current flowing from the conductive container 1 to the conductive container 2. Also, due to lightning strikes,
Even if the voltage between the conductive containers 1 and 2 sharply increases and exceeds, for example, the creeping breakdown voltage value of the insulating spacer 4 (set to V2), the limiting voltage of the zinc oxide element 3 (set to V1). Is set to a value lower than the creeping withstand voltage value V2, and the actual voltage between the conductive containers 1 and 2 is within the limit voltage V1 of the zinc oxide element 3 due to the function of the zinc oxide element 3. Therefore, the insulating spacer 4 does not cause dielectric breakdown on the surface.

[0006]

Since the conventional gas-insulated switchgear is constructed as described above, it has the following problems. In the gas-insulated switchgear shown in FIG. 4, the flange portions 1a and 2a are provided with bolts 5a for fastening them and metal bolts 12a and 12b for fixing the zinc oxide element 3 side by side on substantially the same radius. , A large number of bolts are lined up in the circumferential direction, which is not preferable in terms of appearance.
By aligning the bolts on the same radius, the flange 1
The mechanical rigidity of a and 2a decreases, which is not preferable. further,
When it is necessary to urgently inspect the inside of the conductive containers 1 and 2, the number of bolts is doubled, so that there is a problem that it takes twice as long to disassemble the bolts.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object thereof is to provide a gas-insulated device in which the number of fastening means, metal bolts and the like provided on the flange portion is reduced. It is what

[0008]

A gas-insulated device according to the present invention is provided inside a conductive container between two flange portions which are respectively provided at the connecting ends of the conductive containers and which are opposed to each other. An insulating spacer for supporting the high-voltage conductor to be disposed is interposed, and the fastening means is inserted into a through hole provided so as to penetrate from the one of the flange portions to the other of the flange portion through the insulating spacer, and thus the conductive material is formed. In a gas-insulated device in which insulating containers are connected and an insulating gas is sealed inside,
A cylindrical surge suppressing element is arranged in the through hole portion provided in the insulating spacer.

A conductive spring member is interposed between the surge suppression element and the flange portion.

A conductive spacer is provided between the surge suppressor and the flange portion.

Further, a zinc oxide nonlinear resistor element is used as the surge suppressing element.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. FIG. 1 is an enlarged sectional view showing a main part of a gas-insulated switchgear according to a first embodiment. In the figure, 1a and 2a are flange portions of conductive containers (not shown) arranged to face each other, 4 is an insulating spacer interposed between the pair of flange portions 1a and 2a, and 8 is the above Through holes provided so as to penetrate from one side of the flange portion to the other side of the flange portion through the insulating spacer 4 and are provided in the insulating spacer 4 and through holes 1b and 2b provided in the flange portions 1a and 2a, respectively. Formed by the through hole 4a. Reference numeral 3 denotes a cylindrical zinc oxide element as a surge absorbing element installed between the flange portions 1a and 2a in the through hole 4a portion of the insulating spacer 4, and 3a is fixed to one surface of the zinc oxide element 3. Electrodes 3b abutting on the flange portion 1a and electrically connected thereto are electrodes fixed to the other surface of the zinc oxide element 3 and abutting on the flange portion 2a to be electrically connected.

Reference numeral 5 is a fastening means composed of a bolt 5a and a nut 5b, and the bolt 5a has a through hole 8 as shown in the drawing.
And is inserted through the inside of the cylinder of the zinc oxide element 3. 6a is an insulating cylinder provided so as to surround the outer peripheral portion of the bolt 5a, 6b is an insulating seat interposed between the outer surface of the flange portion 1a and the washer 7, and these insulating cylinder 6a and insulating seat 6b, And the insulating spacer 4
The flange portions 1a and 2a are electrically insulated from each other, that is, the conductive containers 1 and 2 (not shown) are electrically insulated. Then, the bolt 5a and the nut 5b are combined and tightened by rotation, so that the insulating spacer 4 is pressed against the inner surfaces of the flange portions 1a and 2a, and the insulating gas is sealed in a conductive container (not shown). It

The material forming the conductive container is not particularly limited, but an iron-based material or the like can be preferably used in view of required strength and cost. Further, the flange portion 1a is electrically insulated from the bolt 5a and the nut 5b by the insulating cylinder 6a and the insulation seat 6b, while the flange portion 2a is electrically connected to the bolt 5a and the nut 5b. ing. Furthermore, the electrodes 3a, 3b of the tubular zinc oxide element 3 are
Are electrically connected by being brought into contact with the side surfaces of the flange portions 1a and 1b simultaneously with the tightening of the bolt 5a and the nut 5b. Other configurations are similar to those of the above-mentioned conventional device, and therefore illustration and description thereof are omitted.

Next, the first embodiment configured as described above
The operation of will be described. Under a use condition in which a large current is passed through a high-voltage conductor (not shown), an induced current is generated in the conductive container, and the voltage generated between the flange portions 1a and 1b is lower than the creeping breakdown voltage V2 of the insulating spacer 4. And yet,
The voltage is extremely lower than the limiting voltage V1 of the cylindrical zinc oxide element 3, and the insulating effect of the insulating spacer 4 is provided between the flange portions 1a and 2a, so that the current is circulated between the plurality of conductive containers. Can be prevented.

Next, under the condition that a surge voltage is applied between the flange portions 1a and 2b due to a lightning strike, if this voltage is higher than the limiting voltage V1 of the cylindrical zinc oxide element 3, the insulation state of the zinc oxide element 3 will be described. Is changed to be in a conductive state instantaneously, so that the voltage between the flange portions 1a and 1b is actually reduced to be lower than the creeping breakdown voltage value V2 of the insulating spacer 4 and the limit voltage V1 of the zinc oxide element 3 is reduced. It becomes a value, and the insulation spacer 4 is prevented from causing dielectric breakdown on the surface.

As described above, according to the gas-insulated switchgear according to the first embodiment, an operation similar to that of the conventional gas-insulated switchgear is achieved electrically, and the fastening means 5 allows the flange portion 1a and Since the two a are fastened together and the surge suppressor 3 is fixed, the number of bolts and the number of through holes provided in the flange portion can be reduced, and the rigidity of the flange portions 1a and 2a is not reduced. The effect that the appearance is not impaired is obtained. Further, since the number of bolts is small, there is an effect that the disassembling or assembling of the insulating portion can be performed in a shorter time than that of the gas insulated switchgear having the conventional configuration.

Embodiment 2. 2 is an enlarged cross-sectional view showing a main part of a gas-insulated switchgear according to a second embodiment of the present invention. In the figure, 9 is an electrode 3a of a zinc oxide element 3.
It is a ring-shaped conductive spring member (constituent spring) interposed between and the flange portion 1a. An elastic material having conductivity is used as the spring member 9, and for example, conductive rubber, a washer provided with unevenness in the axial direction of the bolt 5a to be inserted,
A spring washer or a combination of any two or more of them can be appropriately used,
It is not limited to these. Since the other reference numerals are exactly the same as those in the first embodiment, the description thereof will be omitted.

According to the second embodiment configured as described above, it is possible to perform the same operation as in the first embodiment, and as a result, as in the first embodiment, the number of bolts is small. Therefore, the time required for disassembling or assembling the insulating portion can be reduced, the external appearance is not impaired, and the rigidity of the flange portions 1a, 2a can be prevented from being lowered. In addition, the spring member 9 has conductivity and elasticity in the axial direction of the bolt 5a, and the total thickness of the zinc oxide element 3 including the variation in the thickness of the insulating spacer 4 and the electrodes 3a and 3b. It is possible to absorb the variation in size, and to improve the reliability of the gas-insulated equipment obtained thereby. Further, since the compression amount of the spring member 9 can absorb the dimensional difference, the dimensional accuracy does not need to be so strict, and the effect of facilitating the manufacturing process of each member can be obtained.

Embodiment 3. 3 is an enlarged cross-sectional view showing a main part of a gas-insulated switchgear according to a third embodiment of the present invention. In the figure, reference numeral 10 denotes a conductive spring member 9 and an electrode 3a of a zinc oxide element 3. It is a ring-shaped conductive spacer interposed between the spacers. The conductive spacer 10
As the material, for example, metals such as copper, aluminum, zinc, nickel, brass, various alloys such as stainless steel, or conductive composite materials using carbon, plastic, or the like can be used. It is not limited. Other reference numerals and configurations are exactly the same as those in the second embodiment shown in FIG. 2 described above, and therefore illustration and description thereof will be omitted.

Generally, the limiting voltage V1 of the zinc oxide element 3 is
Is related to the distance (the thickness of the element) between the electrodes 3a and 3b provided at each end, and the shorter the distance, the smaller the limiting voltage V1. On the other hand, the gas-insulated switchgear
The limiting voltage V1 of the zinc oxide element 3 to be used and the thickness of the insulating spacer 4 may change depending on the specifications such as the usage conditions. Therefore, the conductive spacers 10 having different thicknesses are prepared, and the designing factors thereof are used. By selecting the zinc oxide element 3, the conductive spacer 10, and the conductive spring member 9 as needed, it is possible to obtain a gas-insulated device having the necessary limiting voltage V1. The spring member 9 is similar to that shown in FIG.

As described above, according to the third embodiment, in addition to the effects of the second embodiment, there is an effect that it is possible to provide a gas-insulated switchgear capable of widely corresponding to various specifications. Further, even if the thickness of the zinc oxide element 3 and the thickness of the insulating spacer 4 (distance between the flanges) are not changed, it is not necessary to change the through holes 8 and the fastening bolts 5a, so that there is an effect that standardization is easy. The interposition position of the conductive spacer 10 and the spring member 9 is not limited to that shown in FIG. 3, and may be appropriately disposed at any position between the pair of flanges, for example, by reversing the interposition position. it can. In addition, in the third embodiment, the conductive spacer 10 and the spring member 9 are interposed between the electrode 3a and the flange 1a, but even if only the conductive spacer 10 is interposed, the first embodiment is omitted. The same effect as can be expected.

By the way, in the description of the above embodiment, the zinc oxide nonlinear resistor element is used as the surge absorbing element 3, but the surge absorbing element 3 is not limited to this. The zinc oxide non-linear resistor element is preferably used because it has excellent characteristics and is easily available, and thus it is easy to manufacture and can be constructed at low cost. Further, although the bolt 5a and the nut 5b are used as the fastening means 5,
Other configurations capable of performing similar fastening may also be used.
Further, the case where the present invention is applied to the gas-insulated switchgear has been described, but it goes without saying that the present invention can also be applied to other gas-insulated equipment such as a gas-insulated bus bar.

[0024]

As described above, according to the present invention, the following effects can be obtained.

According to the first invention described in claim 1,
It is possible to provide an effect that it is possible to provide a gas insulated device in which the number of fastening means provided on the flange portion, metal bolts and the like are reduced.

According to the second invention described in claim 2,
In addition to the effects of the first aspect of the invention, it is possible to obtain the effect of being able to absorb variations in the thickness of the insulating spacer and the surge absorbing element.

According to the third invention described in claim 3,
In addition to the effect of the first aspect of the invention, by changing the thickness of the conductive spacer even if the thickness of the surge absorbing element changes, it is possible to easily meet a wide range of specifications.

According to the fourth invention described in claim 4,
In addition to the effects of the first invention, there is an effect that the device can be easily manufactured.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing a main part of a gas-insulated switchgear according to a first embodiment.

FIG. 2 is an enlarged sectional view showing a main part of a gas-insulated switchgear according to a second embodiment.

FIG. 3 is an enlarged sectional view showing a main part of a gas-insulated switchgear according to a third embodiment.

FIG. 4 is a cross-sectional view of a flange portion that forms an insulating section by connecting conductive containers to each other in a conventional gas-insulated switchgear.

5 is an enlarged cross-sectional view showing a mounting structure of a surge suppression element provided on the same radius as the fastening means of the flange portion of FIG.

[Explanation of symbols]

1a, 2a flange part, 3 surge absorbing element (zinc oxide element), 4 insulating spacer, 5 fastening means,
8 through holes, 9 spring members, 10 conductive spacers.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuhiko Hara             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F term (reference) 5G017 AA01 BB20 FF03 FF08                 5G365 DA10 DE02 DF02 DH08 DH11

Claims (4)

[Claims] 1. An insulating spacer for supporting a high-voltage conductor disposed inside the conductive container between two flange portions, which are respectively provided at the connection ends of the conductive containers and facing each other, and are opposed to each other. , Through the insulating spacer from one of the flange portions through the other of the flange portion through the fastening means to connect the conductive containers to each other, the insulating gas inside A gas-insulated device, wherein a cylindrical surge suppression element is provided in a through-hole portion provided in the insulating spacer in the enclosed gas-insulated device. 2. The gas insulated device according to claim 1, wherein a conductive spring member is interposed between the surge suppression element and the flange portion. 3. The gas insulated device according to claim 1, wherein a conductive spacer is provided between the surge suppression element and the flange portion. 4. The gas insulated device according to claim 1, wherein the surge suppressor is a zinc oxide non-linear resistor element.