JP5787621B2 - Lightning protection support insulator - Google Patents

Description

  Embodiments of the present invention relate to a lightning protection support insulator having a lightning protection function.

  Generally, in an electric power system, an overvoltage protection device such as a lightning arrester is used to remove an overvoltage superimposed on a normal voltage and protect the electric power system and electrical equipment.

  FIG. 6 is a cross-sectional view showing a connection portion between a conventional lightning arrester and a main circuit. As shown in FIG. 6, the main circuit conductor 201 which comprises the main electroconductive part in the airtight container 200 is provided. A branch conductor 202 branched from the main circuit conductor 201 passes through an insulating spacer 203 provided in the sealed container 200 and is connected to a lightning arrester 210 provided in a lightning arrester container 205 adjacent to the sealed container 200.

  The lightning arrester 210 includes a stacked body in which a plurality of non-linear resistors 211 are stacked. The branch conductor 202 is electrically connected to the laminated non-linear resistor 211.

Japanese Utility Model Publication No.3-1607

  As described above, conventionally, the branch conductor 202 is required to connect the lightning arrester to the main circuit conductor 201, and the apparatus is increased in size by the volume of the lightning arrester container 212.

  In order to prevent this increase in size, it is possible to eliminate the branch conductor 202 and provide a support insulator provided with a laminated body in which a plurality of nonlinear resistors 211 are laminated between the main circuit conductor 201 and the sealed container 200. Conceivable.

However, the conventional non-linear resistor has a low varistor voltage V _{1 mA} generated between both ends of the non-linear resistor stack when a current of 1 mA flows. In order to cope with this, it was necessary to increase the number of laminated non-linear resistors. When the support insulator is provided between the main circuit conductor 201 and the hermetic container 200, the thickness of the laminate is limited by this gap size, and it is possible to sufficiently cope with the increase in capacity and voltage of the power system. It was difficult. On the other hand, it is conceivable to widen the space between the main circuit conductor 201 and the sealed container 200, but the apparatus becomes larger.

  In addition, in the case of the conventional lightning protection support insulator, the periphery of the laminated body of the non-linear resistor 211 is molded with an insulating resin or the like, and when the non-linear resistor is destroyed by an over-responsible surge, the non-linear resistor is insulated The resin may explode.

  The problem to be solved by the present invention is to provide a lightning protection insulator that is excellent in non-linear resistance and pressure relief.

The lightning protection support insulator according to the embodiment includes a cylindrical insulating container having both ends opened, and a varistor voltage V _{1 mA} generated between the both ends when a current of 1 mA flows is 500 V / mm or more. A laminated body in which a plurality of non-linear resistors to be laminated, a cylindrical first insulating member disposed in the insulating container so as to surround the laminated body with a predetermined gap, and the insulation A communication hole communicating with the inside of the container, and a stop valve provided on the outer side of the communication hole are provided. Further, the lightning protection support insulator is provided by being laminated on one end surface of the laminate, and a first electrode for sealing one opening of the insulating container and a second insulation on the other end surface of the laminate. A second electrode fixed in a stacked state via a member, and a seal that seals the other opening of the insulating container so that the pressure can be released when the pressure in the insulating container exceeds a predetermined pressure. And a stop lid. Further, the sealing lid is provided with a flange member having an opening in the center, and a thin plate shape that is provided so as to seal the opening of the flange member, and is detached when the pressure in the insulating container exceeds a predetermined pressure. And the second electrode, the second insulating member, and the sealing lid are detachable in this order as viewed from the laminate.

It is the figure which showed typically the cross section of the lightning protection support insulator of embodiment which concerns on this invention. It is a figure which shows the cross section of a laminated body when each non-linear resistance body of the lightning protection support insulator of embodiment which concerns on this invention is fastened and fixed with a rod and a nut. It is a figure which shows the cross section of a laminated body when each nonlinear resistance body of the lightning protection support insulator of embodiment which concerns on this invention is fixed by the contact bonding layer. It is a perspective view of a laminated body when each non-linear resistor of the lightning protection support insulator of embodiment which concerns on this invention is wound and fixed with the insulating tape. It is the figure which showed typically the decomposition | disassembly cross section which showed the assembly state in the case of the reuse of the lightning protection support insulator of embodiment which concerns on this invention. It is sectional drawing which shows the connection part of the conventional lightning arrester and a main circuit.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram schematically showing a cross section of a lightning protection support insulator 10 according to an embodiment of the present invention. FIG. 1 shows a state where a lightning protection support insulator 10 is provided in an apparatus provided with a main circuit conductor 101 which is a main conductive part in an airtight container 100.

  As shown in FIG. 1, the lightning protection support insulator 10 includes a cylindrical insulating container 20 having openings 25 and 26 at both ends. On the outer periphery of the insulating container 20, there is a fixing flange 27 for fixing the insulating container 20 to the fixing flange 102 formed around the opening formed in a part of the sealed container 100 by, for example, bolt fastening. Is formed. The insulating container 20 is made of a material such as an epoxy resin, for example.

The fixing flange 27 is formed with a communication hole 27 a for filling an insulating gas such as SF ₆ gas inside the sealed container 100. A stop valve 28 is provided outside the communication hole 27a to block the communication hole 27a from being opened to the atmosphere. The stop valve 28 is opened when the inside of the sealed container 100 is filled with an insulating gas, and is closed otherwise. That is, the sealed container 100 is sealed with the insulating gas filled therein.

In the center of the insulating container 20, a laminated body 22 configured by laminating a plurality of non-linear resistors 21 in the axial direction of the insulating container 20 is disposed. As the non-linear resistor 21, a varistor voltage V _{1 mA} generated between both ends when a current of 1 mA flows is 500 V / mm or more.

The non-linear resistor 21 has zinc oxide (ZnO) as a main component and bismuth (Bi), cobalt (Co), manganese (Mn), antimony (Sb), nickel (Ni), lanthanum rare earth elements (substituents) as subcomponents. It is composed of a sintered body of a mixture containing R) (lanthanoid). Further, the mixture for constituting the sintered body is 0.3 to 1.5 mol% in terms of bismuth converted to Bi ₂ O ₃ , 0.3 to ₂ mol% in terms of cobalt to Co ₂ O ₃ , manganese the in terms of MnO 0.4~3mol%, 0.5~4mol% in terms of antimony _Sb 2 _{O 3,} 0.5~4mol% in terms of nickel in NiO, lanthanum rare earth elements (R ) (Lanthanoid) in terms of R ₂ O ₃ is contained in an amount of 0.05 to 1 mol%. The varistor voltage V _{1 mA} can be set to 500 V / mm or more by configuring the non-linear resistor 21 with a sintered body of the mixture having the above-described composition.

  A cylindrical insulating member 23 is provided in the insulating container 20 so as to surround the laminated body 22 with a predetermined gap. The insulating member 23 is formed into a cylindrical shape by winding an insulating sheet formed of, for example, FRP (Fiber Reinforced Plastics). The insulating member 23 is preferably disposed with a predetermined gap from the inner wall surface of the insulating container 20. That is, it is preferable that the insulating container 20, the insulating member 23, and the laminated body 22 are arranged concentrically with a predetermined gap from the outside in the order of the insulating container 20, the insulating member 23, and the laminated body 22.

  The insulating member 23 is sandwiched between a first electrode 24 and a second electrode 29 described later, and movement is restricted.

  In the insulating member 23, when the non-linear resistor 21 is broken, fragments of the non-linear resistor 21 are scattered, the inner wall surface of the insulating container 20 is damaged, or carbide or the like adheres to the inner wall surface. To prevent. Further, when the insulating member 23 is damaged, it can be easily replaced with a new insulating member 23.

  One opening 25 of the insulating container 20 is sealed by the first electrode 24. For example, as shown in FIG. 1, a concave groove corresponding to the outer diameter of the insulating container 20 is formed on the end face of the first electrode 24 on the opening 25 side, and the insulating container 20 is fitted into the concave groove. can do. In addition, the first electrode 24 is configured to be partially stacked on one end surface of the stacked body 22, and is electrically connected to the stacked body 22. The insulating container 20 and the first electrode 24 are hermetically bonded by, for example, an epoxy resin.

  A contact terminal 24 a for electrical connection with the main circuit conductor 101 is formed on a side different from the opening 25 side of the first electrode 24. For example, as shown in FIG. 1, the contact terminal 24 a is electrically connected by fitting with the contact terminal 101 a formed on the main circuit conductor 101.

  A second electrode 29 is stacked on the other end face of the stacked body 22 and is electrically connected. The second electrode 29 is extended to the outside and grounded. The second electrode 29 does not seal between the other opening 26 of the insulating container 20 and the inside of the insulating container 20, and even when the second electrode 29 is provided, the other electrode 29 of the insulating container 20 is not sealed. The opening 26 and the inside of the insulating container 20 are in communication with each other.

  The second electrode 29 is pressed against the laminated body 22 side through the insulating member 30 on the disk whose center is opened when the sealing lid 31 to be described later is fixed, and is laminated on the other end surface of the laminated body 22. It is fixed to the state.

  The first electrode 24 and the second electrode 29 are made of a conductive material such as aluminum.

  The other opening 26 of the insulating container 20 is sealed with a sealing lid 31. The sealing lid 31 is configured to be able to release pressure when the pressure in the insulating container 20 becomes a predetermined pressure (for example, about 1.8 MPa) or more. Specifically, the sealing lid 31 includes a disc-shaped flange member 32 having an opening 33 in the center, and a sealing member 34 provided so as to seal the opening 33 of the flange member 32. .

  The sealing member 34 is formed of a thin plate made of aluminum having a thickness of about 0.1 mm, for example. For example, as shown in FIG. 1, the center of the sealing member 34 may be constituted by a spherical portion that protrudes outward. In this case, the sealing member 34 is arranged so that the spherical surface portion is located in the opening 33. The peripheral part of the sealing member 34 is configured by a flat plate. The sealing member 34 is fixed by the peripheral portion being sandwiched between the flange member 32 and the insulating member 30.

  The flange member 32 may be fixed to the fixing flange 27 via the insulating member 30 by, for example, bolt fastening. Further, the flange member 32 may be fixed by fixing the fixing flange 102 of the hermetic container 100 through the insulating member 30 and the fixing flange 27, for example, by bolt fastening.

  When the pressure in the insulating container 20 becomes equal to or higher than a predetermined pressure, the peripheral portion of the sealing member 34 cannot be sandwiched between the flange member 32 and the insulating member 30, and the sealing member 34 is pushed out through the opening 33. It is configured to be.

  In order to prevent the sealing member 34 from being directly exposed to the outside, for example, as shown in FIG. 1, the sealing member 34 is made of a thin plate made of aluminum or the like so as to cover the opening 33 of the flange member 32 from the outside. A cover 35 may be provided. The cover 35 is easily fixed to the flange member 32 with an adhesive or the like so that it is easily removed when the sealing member 34 is released to the outside and does not hinder the release.

  Next, a method for fixing the laminated non-linear resistors 21 will be described.

  Examples of the method for fixing the laminated non-linear resistor 21 include the following methods (1) to (3).

(1) Fixing by fastening FIG. 2 is a view showing a cross section of the laminate 22 when each non-linear resistor 21 of the lightning protection insulator 10 of the embodiment according to the present invention is fastened and fixed by a rod and a nut. is there.

  As shown in FIG. 2, disc-shaped insulating members 120 having an outer diameter larger than the outer diameter of the laminated body 22 having an open center are disposed at both ends of the laminated body 22. The opening at the center of the insulating member 120 is for bringing the first electrode 24 and the second electrode 29 into direct contact with the laminate 22.

  In the circumferential direction of the outer peripheral end portion of the insulating member 120, a plurality of through holes 121 are evenly formed. When the insulating members 120 are disposed at both ends of the stacked body 22, the through holes 121 are disposed so as to face each other. Insulating rods 122 are provided through the respective through holes 121 facing each other. The insulating rod 122 is a cylindrical rod-shaped member, and male screws are threaded at both ends thereof. And the laminated nonlinear resistor 21 is being fixed by fastening both ends of the insulating rod 122 with the nut 123.

  Here, the insulating rod is made of, for example, FRP (Fiber Reinforced Plastics).

(2) Fixing by Adhesion FIG. 3 is a view showing a cross section of the laminate 22 when the non-linear resistors 21 of the lightning protection support insulator 10 according to the embodiment of the present invention are fixed by the adhesive layer 130.

  As shown in FIG. 3, an adhesive layer 130 made of a conductive adhesive member is formed between the non-linear resistors 21, and the non-linear resistors 21 stacked thereby are fixed. The adhesive layer 130 is made of a conductive material such as solder.

(3) Fixing by winding FIG. 4 is a perspective view of the laminated body 22 when each non-linear resistor 21 of the lightning protection support insulator 10 of the embodiment according to the present invention is wound and fixed by the insulating tape 140. .

  As shown in FIG. 4, the insulating tape 140 is wound so as to press the nonlinear resistors 21 in the laminating direction, and thus the laminated nonlinear resistors 21 are fixed. The insulating tape 140 is made of, for example, FRP (Fiber Reinforced Plastics).

  By the fixing method described above, the laminated non-linear resistor 21, that is, the laminated body 22 can be fixed. In addition, the fixing method of the laminated body 22 is not restricted to these fixing methods, What is necessary is just the method which can be stably fixed in the state which maintained the electrical connection between each nonlinear resistor 21. FIG.

  Next, the operation of the lightning protection support insulator 10 will be described.

  When an overvoltage is applied to the main circuit conductor 101, an electric circuit including the main circuit conductor 101, the first electrode 24, the laminate 22, and the second electrode 29 is formed, and the main circuit conductor 101 can be protected from the overvoltage. However, when the overvoltage increases and the non-linear resistor 21 constituting the laminated body 22 is destroyed due to overloading, the pressure in the insulating container 20 increases and fragments of the non-linear resistor 21 are scattered.

  At this time, the insulating member 23 prevents the scattered pieces of the non-linear resistor 21 from colliding with the inner wall surface of the insulating container 20. Further, the insulating member 23 prevents carbides and the like from adhering to the inner wall surface of the insulating container 20. Furthermore, when the pressure in the insulating container 20 becomes equal to or higher than a predetermined pressure, the peripheral edge portion of the sealing member 34 cannot be sandwiched between the flange member 32 and the insulating member 30, and the sealing member 34 passes through the opening 33. Extruded outside. As a result, the inside of the insulating container 20 is opened to the atmosphere and released.

  Thus, the pressure inside the insulating container 20 can be released, and the insulating member 23 can be prevented from being damaged by the insulating member 23. As a result, the insulating container 20 itself is not damaged and can be reused as it is.

  Next, the reuse method of the lightning protection support insulator 10 is demonstrated.

  FIG. 5 is a diagram schematically showing an exploded cross-section illustrating an assembled state when the lightning protection support insulator 10 according to the embodiment of the present invention is reused.

  First, the second electrode 29, the laminate 22, and the insulating member 23 can be taken out by removing the sealing lid 31 and the insulating member 30. At this time, the insulating container 20 and the first electrode 24 are hermetically bonded, and the fixing flange 102 and the fixing flange 27 are also hermetically in contact with each other. Are not released to the outside.

  After taking out the damaged laminated body 22 and the insulating member 23, as shown in FIG. 5, the new laminated body 22 and the insulating member 23 are arranged inside the insulating container 20, and the second electrode 29 is arranged. The sealing lid 31 is fixed by bolt fastening or the like via the insulating member 30.

  Subsequently, the stop valve 28 is connected to a vacuum pump system, the stop valve 28 is opened, and the inside of the insulating container 20 is evacuated. After the inside of the insulating container 20 is evacuated, the stop valve 28 is switched to the insulating gas supply system to fill the inside of the insulating container 20 with the insulating gas. After filling the insulating container 20 with the insulating gas, the stop valve 28 is closed. As the stop valve 28, it is preferable to use a three-way valve.

  As described above, even when the laminated body 22 and the insulating member 23 are damaged, the insulating container 20 itself is not damaged. Therefore, the laminated body 22 and the insulating member 23 accommodated therein can be replaced by replacing them. Can be used.

As described above, according to the lightning protection support insulator 10 of the embodiment, by using the non-linear resistor 21 having a varistor voltage V _{1 mA} of 500 V / mm or more, the support insulator is connected to the main circuit conductor 201 and the sealed container 200. Even when it is provided between the two, it is possible to sufficiently cope with the increase in capacity and voltage of the power system. Furthermore, since the number of laminated non-linear resistors 21 can be reduced, the lightning protection insulator 10 can be downsized.

  Further, by providing the insulating member 23, when the non-linear resistor 21 is broken, fragments of the non-linear resistor 21 are scattered, and the inner wall surface of the insulating container 20 is damaged, or carbide is formed on the inner wall surface. Can be prevented. Moreover, since the pressure can be released when the pressure in the insulating container 20 becomes a predetermined pressure or higher, the insulating container 20 can be prevented from being destroyed.

  Further, even when the laminate 22 and the insulating member 23 are damaged, they can be reused by exchanging them, which is excellent in economic efficiency.

  According to the embodiment described above, it is possible to have excellent non-linear resistance and pressure release characteristics.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention.

  DESCRIPTION OF SYMBOLS 10 ... Lightning protection insulator, 20 ... Insulating container, 21 ... Non-linear resistor, 22 ... Laminated body, 23, 30, 120 ... Insulating member, 24 ... First electrode, 24a ... Contact terminal, 25, 26, 33 ... Opening 27, fixing flange, 27a ... communication hole, 28 ... stop valve, 29 ... second electrode, 31 ... sealing lid, 32 ... flange member, 34 ... sealing member, 35 ... cover, 100 ... sealed container DESCRIPTION OF SYMBOLS 101 ... Main circuit conductor, 101a ... Contact terminal, 102 ... Fixing flange, 121 ... Through-hole, 122 ... Insulating rod, 123 ... Nut, 130 ... Adhesive layer, 140 ... Insulating tape.

Claims (6)

A cylindrical insulating container having both ends opened;
A laminate in which a plurality of non-linear resistors are arranged in the insulating container and have a varistor voltage V _{1 mA} generated between both ends when a current of 1 mA flows;
A cylindrical first insulating member disposed in the insulating container so as to surround the laminate with a predetermined gap;
A communication hole communicating with the inside of the insulating container;
A stop valve provided on the outside of the communication hole;
A first electrode that is provided on one end face of the laminate, and seals one opening of the insulating container;
A second electrode fixed in a state of being laminated on the other end surface of the laminate via a second insulating member ;
A sealing lid that seals the other opening of the insulating container so that the pressure can be released when the pressure in the insulating container becomes equal to or higher than a predetermined pressure ;
A lightning support insulator comprising :
The sealing lid is
A flange member having an opening in the center;
And a thin plate-like sealing member that is provided so as to seal the opening of the flange member, and is released when the pressure in the insulating container becomes equal to or higher than a predetermined pressure,
The lightning protection support insulator configured to be detachable in the order of the second electrode, the second insulating member, and the sealing lid when viewed from the laminated body . Claim 1 Symbol mounting of lightning protection support insulator, wherein an insulating gas is filled into the insulating vessel. A disc-shaped third insulating member having an outer diameter larger than the diameter of the laminated body opened at the center is disposed at both ends of the laminated body, and is formed in the circumferential direction of the outer peripheral end portion of the third insulating member. 3. The lightning arrester according to claim 1, wherein the laminated body is fixed by inserting an insulating rod into through holes facing each other at both ends, and fixing both ends of the insulating rod with nuts. Supporting lion. The lightning protection supporting insulator according to claim 1 or 2 , wherein the laminated body is fixed by adhering the laminated non-linear resistors with a conductive adhesive member. The lightning protection support insulator according to claim 1 or 2 , wherein the laminated body is fixed by winding an insulating tape so as to press the non-linear resistors in the laminating direction. The first electrode is electrically connected to the main conductive portion when the lightning protection support insulator is disposed so as to support the main conductive portion in a device including the main conductive portion in an airtight container. The lightning protection support insulator according to any one of claims 1 to 5 .

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