JP4496402B2 - Gas insulation device and insulation spacer thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas insulating device employing a gas insulating method, and an insulating spacer of a gas insulating device that holds a bus conductor while dividing a gas in a sealed container of the gas insulating device.
[0002]
[Prior art]
In general, in a gas insulated switchgear, for example, in a gas insulated switchgear, the gas insulated switchgear circuit breaker, disconnector, etc., are separated into gas in a sealed container in which they are stored or in part. When an accident such as insulation breakdown or gas leakage occurs, an insulation spacer is provided in the sealed container to quickly remove the accident occurrence part and quickly restore the sound part, and the bus conductor is supported by this insulation spacer. In addition, a gas compartment is performed.
[0003]
Such a gas insulated switchgear is disclosed, for example, in Japanese Utility Model Laid-Open No. 59-1335011. FIG. 6 is a view showing a conventional gas-insulated switchgear disclosed in Japanese Utility Model Laid-Open No. 59-133501, and is a view showing the vicinity of a divided portion where a gas-like compartment is formed.
[0004]
As shown in FIG. 6, an insulating spacer 102 is integrally cast around the current-carrying conductor 101, and the insulating spacer 102 cast integrally with the current-carrying conductor 101 is attached to the side surface of the cylindrical sealed container 103. The sealed container 103 is divided so that gas does not leak. The high-voltage conductor 104 separated for each section is joined to the current-carrying conductor 101 via the adjustment conductor 105, whereby the high-voltage conductor 104 is arranged along the axial direction of the sealed container 103. .
[0005]
Another gas-insulated switchgear using an insulating spacer cast integrally with a metal sleeve instead of a conducting conductor is disclosed in Japanese Utility Model Publication No. 63-179722. This gas insulated switchgear has a cylindrical metal sleeve joined to the bus conductor, and the insulating spacer is cast integrally with the metal sleeve. The metal sleeve and the insulating spacer are joined by inserting the bus conductor into the metal sleeve and welding the bus conductor to the sleeve.
[0006]
[Problems to be solved by the invention]
In conventional gas-insulated switchgear, the insulating spacer is cast together with the current-carrying conductor and the metal sleeve, so a casting process is required for the casting, and the structure is complicated. There was a problem of high costs. Furthermore, casting the insulating member, the current-carrying conductor, and the metal sleeve integrally is not preferable mechanically, particularly in terms of thermal stress, and has the problem of causing cracks and cracks.
[0007]
In addition, in the case where the conductive conductor is embedded in the insulating member, since the conductive conductor is embedded in the insulating member, the electric field of the embedded portion is increased, while in the case of using a metal sleeve, the bus bar conductor is welded. Therefore, there is a problem that the electric field of the welded portion becomes high, and both of them have a dielectric breakdown due to the high electric field.
[0008]
The present invention has been made to solve the above problems, and provides a gas insulating device having a simple structure, easy to manufacture, and having a preferable structure in terms of mechanical stress, and an insulating spacer thereof.
[0009]
It is another object of the present invention to provide a gas insulating apparatus in which an electric field is prevented from becoming high around a contact portion between a bus conductor and an insulating spacer.
[0010]
[Means for Solving the Problems]
A gas insulating apparatus according to the present invention includes a cylindrical container that constitutes a sealed container in which an insulating gas is sealed, a bus conductor disposed in the cylindrical container along an axial direction thereof, and the bus conductor An insulating spacer attached to the cylindrical container so as to hold the busbar conductor in an insulated manner with respect to the cylindrical container ; even during operation not only during assembly characterized in that it is slidably held against the insulating spacer.
[0011]
Moreover, you may form an insulating spacer integrally only with an insulating member including a fitting part.
[0012]
Further, an O-ring may be arranged between the fitting portion of the insulating spacer and the bus conductor, and the gas division in the sealed container may be performed by this O-ring.
[0013]
Further, a groove for arranging an O-ring may be provided in the bus conductor, and the O-ring may be arranged in this groove.
[0015]
Moreover, you may provide the said bus-bar conductor with the shield which can move along a bus-bar conductor at the time of attachment.
[0016]
Further, a groove for arranging the O-ring may be provided in the bus conductor, and a shield may be provided so as to cover the groove.
[0017]
Further, the bus conductor includes first and second conductors coupled to each other having the same cross-sectional shape, and the cross-sectional shape at the coupling portion of the first and second conductors at the time of coupling is the first and second conductors. A cutout may be provided in each coupling portion so as to have the same cross-sectional shape of the conductor.
[0018]
In addition, the insulating spacer of the gas insulating device according to the present invention is disposed along the axial direction in the cylindrical container, the mounting portion attached to the cylindrical container constituting the sealed container in which the insulating gas is sealed. is provided with a fitting portion consisting of the outer circumference and fitting insulating member of the bus conductor is, the bus conductor shall be the characterized in that is also slidably held during operation as well as during assembly.
[0019]
Moreover, you may form an insulating spacer integrally only with an insulating member including a fitting part.
[0020]
Further, the insulating spacer is formed in a plate shape so as to have a conical shape, and has an elongated portion extending in the axial direction and a through hole penetrating the elongated portion in the axial direction. A conductor may be fitted into the through hole.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a gas insulating apparatus according to Embodiment 1, and is a cross-sectional view showing a gas insulating apparatus having a sealed container in which gas is divided. In the figure, reference numeral 1 denotes a cylindrical container constituting a sealed container for sealing an insulating gas such as SF _6. These cylindrical containers 1 are connected to each other by connecting flanges provided at respective end portions. Yes.
[0022]
Reference numeral 2 denotes a bus bar conductor arranged along the axial direction of the cylindrical container 1, a round bar-shaped first high voltage conductor 2 a held by the insulating spacer 3, and the first high voltage conductor 2 a or finger. Connected to the contact 6 and arranged along the axial direction of the cylindrical container 1, the cross-sectional shape of the second high-voltage conductor 2 b is the same as the first high-voltage conductor 2 a and has the same round bar shape. Has been.
[0023]
Reference numeral 3 denotes a cylindrical container 1 for holding the bus conductor 2 (first high-voltage conductor 2a) so that the bus conductor 2 is electrically insulated from the cylindrical container 1 and performing gas division in a sealed container. This insulating spacer 3 has an attachment portion attached to the cylindrical container 1 and a fitting portion made of an insulating member fitted to the outer periphery of the bus bar conductor 2. .
[0024]
The insulating spacer 3 may have a disc shape or the like, but it is particularly preferable that the insulating spacer 3 has a mirror-like shape having a mechanical strength (a plate shape having a conical shape). The insulating spacer 3 extends in the axial direction through an extending portion made of an insulating member that extends in the axial direction of the cylindrical container 1 (direction perpendicular to the radial direction of the insulating spacer 3). A through hole 3a (fitting portion) is provided, and the bus bar conductor 2 is directly fitted into the through hole 3a.
[0025]
That is, the bus bar conductor 2 (high voltage conductor 2a) is inserted into the through hole 3a of the elongated portion, and the outer periphery of the bus bar conductor 2 is fitted to the inner wall of the through hole 3a. It is supposed to be retained. However, the bus conductor 2 is held by the insulating spacer 3 so as to be slidable with respect to the insulating spacer 3 even during operation.
[0026]
In addition, since the insulating spacer 3 has a simple structure and can be integrally formed of an insulating member including the fitting portion, the manufacturing cost can be suppressed. Furthermore, since it is comprised only from the insulating member, it is excellent in mechanical and thermal stress, and can suppress generation | occurrence | production of a crack and a crack. The insulating spacer 3 may be formed by connecting an extended portion separately, but is preferably integrally formed.
[0027]
4 is an O-ring provided between the outer periphery of the first high-voltage conductor 2a and the inner wall of the through-hole 3a. The first high-voltage conductor 2a inserted into the through-hole 3a by the O-ring 4 is a cylindrical container. 1 is slidable in the axial direction. Further, the through-hole 3a is sealed by the O-ring 4 so that gas division in the sealed container is performed. The O-ring 4 may be an elastic material such as rubber.
[0028]
In order to fix the position of the O-ring 4, it is preferable to provide a groove portion at a predetermined position of the first high-voltage conductor 2 a and place the O-ring 4 in this groove portion. In this case, the electric field relaxation shield for the arrangement position (groove portion) of the O-ring may be configured on the outer peripheral side of the insulator. By doing in this way, it can be brought close to an equal electric field without electric field concentration.
[0029]
Although the groove portion can be formed on the insulating spacer 3 side, when the groove portion is formed on the insulating spacer 3 side, the casting process is increased, resulting in an increase in manufacturing cost. On the contrary, if the groove is formed in the bus conductor 2, the casting process is suppressed, and the manufacturing cost can be reduced. Therefore, the groove is preferably formed in the bus conductor 2.
[0030]
A shield 5 is provided on the outer periphery of the bus conductor 2 and is movable along the bus conductor 2 when attached. This shield 5 is a joint between the first high-voltage conductor 2a and the second high-voltage conductor 2b. Is disposed so as to cover a part of the insulating spacer 3. Thus, since the outer periphery of the coupling portion is covered, the electric field concentration in the coupling portion can be reduced, and the outer diameter of the coupling portion can be made compact.
[0031]
Further, since the shield 5 is provided so as to cover the end portion of the insulating spacer 3 as well, the connection portion of the conductor 2 is hidden, so that the electric field concentration in the extended portion of the insulating spacer 3 made of an insulating member is alleviated. Can improve the insulation strength. At the same time, the three-point electric field relaxation of the O-ring 4, the conductor 2, and the gas (covered with the shield 5 and hidden in the shadow) is also performed. In addition, 6 is a finger contact, 7 is a volt | bolt which fixes the 1st, 2nd high voltage conductors 2a and 2b.
[0032]
2 is a three-sided view showing details of the first high-voltage conductor 2a shown in FIG. 1, FIG. 2 (a) is a plan view, FIG. 2 (b) is a side view, and FIG. It is the front view seen from the longitudinal direction of 1 high voltage conductors.
[0033]
As shown in FIG. 2, at the time of coupling, the cross-sectional shape at the coupling portion of the first and second high-voltage conductors 2a and 2b is the same as the cross-sectional shape of the first and second high-voltage conductors 2a and 2b. Thus, a notch is provided in each coupling portion.
[0034]
That is, a connecting flat portion 21a having a cross section cut into a half-moon shape is formed at both ends of the first high-voltage conductor 2a. Two screw holes 22a for tightening are formed. Further, a groove 23a for arranging the O-ring 4 is provided. By having such a connection part, it can be easily coupled to the second high-voltage conductor 2b at both ends thereof.
[0035]
3 is a three-sided view showing details of the second high-voltage conductor 2b shown in FIG. 1, FIG. 3 (a) is a plan view, FIG. 3 (b) is a side view, and FIG. It is the front view seen from the longitudinal direction of 2 high voltage conductors.
[0036]
As shown in FIG. 3, the connecting portion coupled to the first high voltage conductor 2a has the same connecting portion as that of the first high voltage conductor 2a. In the case of being coupled, a coupling portion for that purpose is formed. By having such a coupling portion, the end portion can be easily coupled to the second high voltage conductor 2b and the finger contactor 5. Note that FIG. 3 shows that both end portions have connection portions for coupling to the first high-voltage conductor 2a.
[0037]
4 is a diagram showing details of the shield 5 shown in FIG. 1, in which FIG. 4 (a) is a front view, FIG. 4 (b) is a sectional view, and FIG. 4 (c) is a rear view.
[0038]
As shown in FIG. 4, the outer periphery of the shield 5 is formed in a circular arc shape so that electric field concentration is less likely to occur. On the other hand, the inner circumference has a diameter 51 so that the bus conductor 2 can be inserted at the smallest diameter portion 51 and the shield 5 can be moved when the bus conductor 2 (first high voltage conductor 2a) is inserted. The size of is set.
[0039]
Further, the insulating spacer has a portion 52 in which a bolt used for connecting the first and second high-voltage conductors 2a and 2b is accommodated, and also covers a part (outer peripheral portion) of the insulating spacer 3. 3 is formed so as to have a portion 53 in which the outer peripheral portion is accommodated. Further, a screw hole 54 penetrating in the radial direction from the outer peripheral side of the shield 5 toward the inner hole is provided.
[0040]
By configuring the shield 5 as described above, the structure for attaching to the gas insulating device can be simplified, and further, a fixture for fixing the shield 5 does not protrude from the surface of the shield. Since it is arranged in the shield 5, there is no protrusion of a fixture for fixing the shield 5, and the outer diameter of the joint can be reduced. Moreover, since it is inserted in the outer periphery of the bus-bar conductor 2, the danger of shield drop-off caused by loosening of fastening parts due to vibration during operation can be eliminated.
[0041]
Next, a method for assembling the gas insulating device shown in FIG. 1 will be described. When assembling this apparatus, first, an O-ring 4 is attached to the outer periphery of the first high-voltage conductor 2a and inserted into the through hole 3a of the insulating spacer 3.
[0042]
Thereafter, in a state where the shield 5 is slid and held on the body portion of the second high voltage conductor 2b itself, the joining plane 21b of the second high voltage conductor 2b is fixed to the first high voltage conductor 2a. Then, it is brought into contact with the joining plane 21 a and tightened with the bolt 7.
[0043]
Then, the shield 5 is slid to the insulating spacers 3 on both sides and moved to a position where the tip of the shield 5 covers the cylindrical portion at the center of the shield 5, and a set screw is inserted into the screw hole 54 of the shield 5. Screw in and fix.
[0044]
In this embodiment, there is provided an insulating spacer that has a fitting portion that fits with the outer periphery of the bus conductor and is attached to the cylindrical container so as to insulate and hold the bus conductor with respect to the cylindrical container. Therefore, the bus bar conductor can be held by the insulating spacer without filling, the structure is simple and easy to manufacture, and the structure is favorable in terms of mechanical stress. That is, since there is no buried metal, it is easy to manufacture the insulating spacer, and an excessive force is not generated between the insulating spacer and the bus conductor, so that it is difficult to cause peeling or the like.
[0045]
In addition, since the bus bar conductor is slidable with respect to the insulating spacer, it is easy to correct the dimensional error during assembly, and when disposing of the device, the parts can be easily disassembled and recycled easily. can do. Further, since the bus conductor is held by the insulating spacer so as to be slidable with respect to the insulating spacer even during operation, it is easy to follow the expansion and contraction even when the bus conductor during operation is expanded and contracted. .
[0046]
In addition, since an O-ring is provided between the inner wall of the through hole of the insulating spacer and the bus bar conductor, and the O-ring is used to perform gas division in the sealed container, the bus bar conductor is moved with respect to the insulating spacer. As a result, assembly is easy (easy to work and easy to adjust for absorption of assembly errors), and it is possible to easily follow the expansion and contraction of the conductor during operation.
[0047]
In addition, since the cross-sectional shape of the joint portion of the first and second conductors is the same as the cross-sectional shape of the first and second conductors when the joint is joined, a cutout is provided in each joint portion. The outer diameter of the joint can be made compact.
[0048]
Embodiment 2. FIG.
In the first embodiment, the second high voltage conductor is arranged between the insulating spacers adjacent to each other. However, in this second embodiment, there are several high voltage conductors constituting the bus conductor. The insulating spacer is penetrated.
[0049]
FIG. 5 is a cross-sectional view showing the gas insulating apparatus according to the second embodiment, and is a cross-sectional view showing the periphery of the insulating spacer of the gas insulating apparatus having a sealed container with gas sections. In the figure, 2c is a bus conductor arranged along the axial direction of the cylindrical container 1 constituting the sealed container, and is held by the insulating spacer 3 and has a plurality of insulating spacers along the axial direction of the cylindrical container 1. This is a round bar-shaped high-voltage conductor arranged through.
[0050]
Insulation 3 is in close contact with the inner side wall of the cylindrical container 1 to hold the bus conductor 2c so that the bus conductor 2c is electrically insulated from the cylindrical container 1 and to perform gas division in the sealed container. The configuration of the spacer, such as its shape, is the same as that of the first embodiment. A groove portion for fixing the position of the O-ring 4 is provided at a predetermined position of the bus conductor 2c.
[0051]
A shield 5a is slidable in the axial direction on the outer periphery of the conductor, and is arranged so as to cover a portion where the bus conductor 2c is held by the insulating spacer 3 including a part of the insulating spacer 3. Others are the same as those of the first embodiment, and thus the description thereof is omitted.
[0052]
In this embodiment, since one bus conductor passes through several insulating spacers, the number of joint portions of the bus conductor can be reduced, so that the bus conductor is easily manufactured and assembled. Further, since the number of joints can be reduced, the amount of heat generated due to the contact resistance of the joints can be reduced, the resistance loss can be reduced, and the life of the equipment can be extended by reducing the degree of temperature rise.
[0053]
【The invention's effect】
A gas insulating apparatus according to the present invention includes a cylindrical container that constitutes a sealed container in which an insulating gas is sealed, a bus conductor disposed in the cylindrical container along an axial direction thereof, and the bus conductor An insulating spacer attached to the cylindrical container so as to insulate and hold the bus bar conductor with respect to the cylindrical container, the bus bar conductor being assembled; Since it is slidably held with respect to the insulating spacer not only during operation but also during operation, it is possible to easily follow the expansion and contraction of the bus bar conductor during operation. Further, the bus bar conductor can be held by the insulating spacer without being buried, and its manufacture is easy. Furthermore, it is also preferable in terms of mechanical stress, and an excessive force is not generated between the insulating spacer and the bus conductor, and peeling or the like can be made difficult to occur.
[0054]
In addition, when the insulating spacer is integrally formed with only the insulating member including the fitting portion, the structure can be simplified and the manufacturing cost can be suppressed, and further, the insulating spacer is configured only with the insulating member. It is excellent in mechanical and thermal stress and can suppress cracks and cracks.
[0055]
In addition, when an O-ring is arranged between the fitting portion of the insulating spacer and the bus conductor, and the gas division in the sealed container is performed by the O-ring, the gas division in the sealed container is performed with a simple configuration. be able to.
[0056]
Moreover, when the groove part for arrange | positioning an O-ring is provided in a bus-bar conductor and an O-ring is arrange | positioned in this groove part, the number of casting processes can be restrained and manufacturing cost can be restrained low.
[0058]
Moreover, when the shield which can move along a bus-bar conductor at the time of attachment is provided in the said bus-bar conductor, the attachment structure becomes simple.
[0059]
Further, when a groove portion for arranging the O-ring is provided in the bus conductor and the shield is provided so as to cover the groove portion, the three-point electric field relaxation of the O-ring, the bus conductor, and the gas can be performed. .
[0060]
Furthermore, the bus bar conductor includes first and second conductors coupled to each other having the same cross-sectional shape, and the cross-sectional shape at the coupling portion of the first and second conductors when joined is the first and second conductors. When notches are provided in the respective joint portions so as to have the same cross-sectional shape as the conductor, the outer diameter of the joint portion can be made compact.
[0061]
In addition, the insulating spacer of the gas insulating device according to the present invention is disposed along the axial direction in the cylindrical container, the mounting portion attached to the cylindrical container constituting the sealed container in which the insulating gas is sealed. The bus bar conductor is provided so as to be slidable not only during assembly but also during operation. It is possible to easily follow the expansion and contraction. Further, the bus bar conductor can be held by the insulating spacer without being buried, and its manufacture is easy. Furthermore, it is preferable in terms of mechanical stress, and the occurrence of peeling or the like can be reduced.
[0062]
In addition, when the insulating spacer is integrally formed with only the insulating member including the fitting portion, the structure can be simplified and the manufacturing cost can be suppressed, and further, the insulating spacer is configured only with the insulating member. It is excellent in mechanical and thermal stress and can suppress cracks and cracks.
[0063]
Furthermore, the insulating spacer is formed in a plate shape and has a conical shape, and has an extending portion that extends in the axial direction and a through hole that passes through the extending portion in the axial direction. When the bus bar conductor is fitted into the through hole, an insulating spacer excellent in mechanical stress and thermal stress can be obtained with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a diagram showing a gas insulating apparatus according to a first embodiment of the present invention.
FIG. 2 is a diagram showing details of a first high voltage conductor 2a shown in FIG.
3 is a diagram showing details of a second high voltage conductor 2b shown in FIG. 1; FIG.
FIG. 4 is a diagram showing details of the shield 5 shown in FIG. 1;
FIG. 5 is a diagram showing a gas insulating device according to a second embodiment of the present invention.
FIG. 6 is a view showing a conventional gas insulated switchgear.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylindrical container 2, 2c Bus conductor 2a 1st high voltage conductor 2b 2nd high voltage conductor 3 Insulating spacer 3a Through-hole 4 O-ring 5, 5a Shield 6 Finger contact 7 Bolt 21a, 21b Plane part 22a 22b Screw hole 23a Groove 54 Screw hole 101 Conductive conductor 102 Insulating spacer 103 Sealed container 104 High voltage conductor 105 Adjustment conductor

Claims (10)

A cylindrical container that constitutes a sealed container in which an insulating gas is sealed, a bus conductor disposed in the cylindrical container along the axial direction thereof, and an insulating member that fits to the outer periphery of the bus conductor. And an insulating spacer attached to the cylindrical container so as to insulate and hold the bus conductor with respect to the cylindrical container, the bus conductor not only during assembly but also during operation. gas insulated device according to claim Rukoto is slidably held against the insulating spacer. The gas insulating device according to claim 1, wherein the insulating spacer is integrally formed of only the insulating member including the fitting portion. 3. The gas insulating device according to claim 1, wherein an O-ring is disposed between the fitting portion of the insulating spacer and the bus bar conductor, and gas division in the sealed container is performed by the O-ring. 4. The gas insulating device according to claim 3, wherein a groove for arranging an O-ring is provided in the bus conductor, and the O-ring is arranged in the groove. 3. The gas insulation apparatus according to claim 1, wherein a shield that is movable along the bus conductor at the time of attachment is provided on the bus conductor. 6. The gas insulating device according to claim 5, wherein a groove for arranging the O-ring is provided in the bus bar conductor, and a shield is provided so as to cover the groove. The bus conductor includes first and second conductors coupled to each other having the same cross-sectional shape, and the cross-sectional shape at the coupling portion of the first and second conductors when coupled is the first and second conductors. 3. The gas insulating device according to claim 1, wherein a cutout is provided in each coupling portion so as to have the same cross-sectional shape. A mounting portion attached to a cylindrical container constituting a sealed container in which an insulating gas is sealed, and an insulating member fitted to the outer periphery of a bus conductor disposed in the cylindrical container along the axial direction thereof An insulating spacer for a gas insulating device, comprising: a fitting portion , wherein the bus conductor is slidably held not only during assembly but also during operation . The insulating spacer for a gas insulating device according to claim 8, wherein the insulating spacer is integrally formed of only an insulating member including a fitting portion. The insulating spacer is plate-shaped and has a conical shape. The insulating spacer has an elongated portion extending in the axial direction and a through-hole penetrating the elongated portion in the axial direction. The insulating spacer of the gas insulating device according to claim 8 or 9, wherein is fitted into the through hole.

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