WO2012066614A1 - ガス絶縁母線 - Google Patents
ガス絶縁母線 Download PDFInfo
- Publication number
- WO2012066614A1 WO2012066614A1 PCT/JP2010/070299 JP2010070299W WO2012066614A1 WO 2012066614 A1 WO2012066614 A1 WO 2012066614A1 JP 2010070299 W JP2010070299 W JP 2010070299W WO 2012066614 A1 WO2012066614 A1 WO 2012066614A1
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- WO
- WIPO (PCT)
- Prior art keywords
- main circuit
- shield
- metal container
- circuit conductor
- gas
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/40—Insulated conductors or cables characterised by their form with arrangements for facilitating mounting or securing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G5/00—Installations of bus-bars
- H02G5/06—Totally-enclosed installations, e.g. in metal casings
- H02G5/066—Devices for maintaining distance between conductor and enclosure
- H02G5/068—Devices for maintaining distance between conductor and enclosure being part of the junction between two enclosures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G5/00—Installations of bus-bars
- H02G5/002—Joints between bus-bars for compensating thermal expansion
Definitions
- the present invention relates to a gas-insulated bus in which a main circuit conductor is disposed in a metal container filled with an insulating gas, and the main circuit conductor is insulated and supported by an insulating spacer.
- a gas-insulated bus used in a power plant or substation is configured by placing a main circuit conductor in a metal container filled with insulating gas and insulatingly supporting the main circuit conductor from the metal container with an insulator.
- Patent Document 1 describes a gas-insulated bus having a cylindrical shield that covers ends of main circuit conductors facing each other, and a conical insulating support that supports the shield in a metal container.
- the present invention has been made in view of the above, and is a gas-insulated bus capable of reducing the electric field concentrated on the ends of the main circuit conductor and the shield, and improving the assembly workability and simplifying the structure.
- the purpose is to provide.
- a gas-insulated bus includes a cylindrical metal container that is filled with an insulating gas and is housed in the metal container.
- a main circuit conductor extending in parallel with the axis of the main body of the metal container and having a circular cross-sectional outer shape, and disposed at a predetermined interval in the axial direction of the main body in the metal container, one end of the metal container Insulation of a single leg structure that is attached to the container and electrically insulated and held in the metal container at the other end to insulate and support the main circuit conductor in the metal container
- a metal shield having a shape and provided on a side surface of the metal container, arranged at the predetermined interval in the axial direction according to the installation
- the electric field concentrated on the ends of the shield and the main circuit conductor can be reduced, and the electric field around the central part of the shield can also be reduced.
- the insulating spacer and the shield can be assembled outside the metal container and then installed in the metal container through the branch pipe, so that the assembling workability is improved.
- the structure of the busbar is simplified because the single-leg insulating spacer and the barrel-shaped shield are used.
- FIG. 1 is a longitudinal sectional view of a gas insulating bus according to the first embodiment.
- FIG. 2 is a detailed view of part A in FIG. 3 is a cross-sectional view taken along the line BB in FIG.
- FIG. 4 is a CC arrow view in FIG.
- FIG. 5 is a diagram showing another connection form of the end portions of the main circuit conductor.
- FIG. 6 is a longitudinal sectional view of a gas insulating bus according to the second embodiment.
- FIG. 7 is a detailed view of part A in FIG. 8 is a cross-sectional view taken along the line BB in FIG.
- FIG. 1 is a longitudinal sectional view of a gas insulating bus according to the present embodiment
- FIG. 2 is a detailed view of a portion A in FIG. 1
- FIG. 3 is a sectional view taken along line BB in FIG. 2, and FIG. FIG.
- the main circuit conductor 2 is placed in a cylindrical metal container 1 filled with an insulating gas such as sulfur hexafluoride (SF 6 ). Is stored.
- the metal container 1 is arranged with the longitudinal direction set horizontal, for example.
- the metal container 1 may be arranged vertically or tilted.
- the axis 3 is the central axis of the main trunk of the metal container 1.
- the main circuit conductor 2 extends in parallel with the axis 3, for example, the axis of the main circuit conductor 2 coincides with the axis 3.
- the main circuit conductor 2 is an energization portion through which a voltage is applied and a current flows.
- the main circuit conductor 2 has an annular cross section, for example, and the outer shape of the cross section is circular.
- the main circuit conductor 2 represents one of the three phases, and the remaining two phases have the same configuration.
- the metal container 1 is formed of, for example, a cylindrical member having flanges 4 formed at both ends, and a plurality of cylindrical members are connected in the direction of the axis 3 by fastening the cylindrical members together with the flange 4. ing.
- a structure in which the main cylinders of the adjacent metal containers 1 are connected by welding may be used.
- the branch pipes 5 are arranged, for example, at regular intervals in the direction of the axis 3, and similarly the branch pipes 16 are arranged, for example, at regular intervals in the direction of the axis 3.
- the branch pipe 5 is, for example, a cylindrical branch, and is branched, for example, in a direction substantially orthogonal to the direction of the axis 3.
- the branch pipe 16 is a cylindrical branch, for example, and branches in a direction substantially orthogonal to the direction of the axis 3.
- a branch pipe 16 is provided below the branch pipe 5, and the axis of the branch pipe 5 and the axis of the branch pipe 16 are aligned, for example.
- the inner diameter of the branch pipe 5 can be, for example, not more than the inner diameter of the main barrel of the metal container 1. Since the length of the branch pipe 5 is shorter than the length of the metal container 1, when the branch pipe 5 is formed in the metal container 1, the inner diameter of the branch pipe 5 is equal to or smaller than the inner diameter of the main cylinder of the metal container 1. Sometimes it is easier to work than when the opposite is true. When the inner diameter of the branch pipe 5 is larger than the inner diameter of the main cylinder of the metal container 1, the metal container 1 is divided, and a dedicated container is manufactured and installed only around the insulating spacer 6. Manufacturing cost increases. Similarly, the inner diameter of the branch pipe 16 can be made equal to or smaller than the inner diameter of the main barrel of the metal container 1.
- a lid 15 is attached to the branch pipe 5 with bolts or the like, for example.
- the lid 15 seals the metal container 1, and the insulating spacer 6 is attached to the lid 15.
- the insulating spacer 6 has a single leg structure, for example.
- the insulating spacer 6 is columnar, for example, and the cross-sectional shape by a plane perpendicular to the longitudinal direction is circular, for example.
- An embedded electrode 9, which is an embedded electrode on the metal container side, is embedded in one end of the insulating spacer 6, and the embedded electrode 9 is fixed to the lid 15 with, for example, a bolt or the like. That is, one end of the insulating spacer 6 is attached to the lid 15 that is a part of the metal container 1 via the embedded electrode 9. Therefore, one end of the insulating spacer 6 is disposed in the branch pipe 5.
- the embedded electrode 9 is preferably located outside the region defined by the inner diameter of the main barrel of the metal container 1 with the axis 3 as the center. Thereby, the electric field around the embedded electrode 9 is relaxed.
- the electric field is an electric field generated inside the metal container 1 when the main circuit conductor 2 is energized.
- the entire embedded electrode 9 can be disposed outside the region defined by the inner diameter of the main shell of the metal container 1 with the axis 3 as the center. In this case, the electric field around the embedded electrode 9 is the most. Alleviated.
- a buried electrode 10 which is a buried electrode on the shield side is buried in the other end portion of the insulating spacer 6. Further, a substantially barrel-shaped metal shield 7 is attached to the other end portion of the insulating spacer 6 via an embedded electrode 10. Specifically, the shield 7 is fixed to the embedded electrode 10 using, for example, a bolt or the like.
- the shield 7 has a hollow structure in which the current-carrying portion of the main circuit penetrates in the direction of the axis 3, has openings 11 at both ends in the direction of the axis 3, and covers the connection portion of the main circuit conductor 2. The diameter of the opening 11 of the shield 7 is larger than, for example, the outer diameter ⁇ d 1 of the main circuit conductor 2.
- the outer diameter of the shield 7 is larger than the outer diameter ⁇ d 1 of the main circuit conductor 2 regardless of the position in the direction of the axis 3.
- the electric field at each end of the shield 7 and the main circuit conductor 2 tends to increase.
- the shield 7 has a substantially barrel shape, and the outer diameter of the shield 7 is larger than the outer diameter ⁇ d 1 of the main circuit conductor 2. By doing so, the equipotential lines can be pushed out, and the concentration of the electric field in the vicinity of the end can be reduced.
- the shield 7 into a substantially barrel shape, the radius of curvature at the center is increased, and the electric field around the center is also reduced.
- annular plate-shaped annular portion 18 is provided along the inner periphery of the shield 7 at a substantially central portion in the direction of the axis 3.
- the annular part 18 is connected to the inner surface of the main body of the shield 7 whose outer peripheral part forms a substantially barrel-shaped outer shape, and is arranged with its central axis coinciding with, for example, the axis 3.
- a substantially cylindrical adapter conductor 12 is inserted into the annular part 18 with its axis parallel to the axis 3, and the adapter conductor 12 is connected to the annular part 18 via the flange part 19. Fixed and supported.
- the flange portion 19 is disposed on one surface (for example, the left surface) of the annular portion 18 in the direction of the axis 3, and the flange portion 19 and the annular portion 18 are fastened by, for example, a bolt or the like.
- the adapter conductor 12 is used for connection between the ends of the main circuit conductor 2.
- a recess 8 is formed on a part of the outer surface of the shield 7 on the side of the branch pipe 5.
- the other end of the insulating spacer 6 is disposed in the recess 8, and the insulating spacer 6 is disposed so as to be sandwiched between the shields 7. Therefore, at least a part of the embedded electrode 10 is disposed in the recess 8.
- the electric field around the embedded electrode 10 can be reduced. Note that the entire embedded electrode 10 can be disposed in the recess 8, and in this case, the electric field around the embedded electrode 10 is most relaxed.
- the main circuit conductor 2 is configured by connecting a plurality of, for example, tubular conductors having a predetermined length in the direction of the axis 3.
- the connection part between the main circuit conductors 2 is, for example, a place where the insulating spacer 6 is installed.
- the end parts 22 of the main circuit conductors 2 connected to each other are arranged to face each other. That is, the end 22 of one main circuit conductor is inserted into one opening 11 of the shield 7, and the end 22 of the other main circuit conductor is inserted into the other opening 11 of the shield 7.
- the end portions 22 are disposed to face each other at a predetermined distance, and the adapter conductor 12 is disposed between the end portions 22.
- the end portion 22 has a circular outer shape, for example, and an outer diameter thereof is smaller than, for example, the outer diameter ⁇ d 1 of the main circuit conductor 2.
- the end 22 of one main circuit conductor inserted into one opening 11 of the shield 7 is connected to one end of the adapter conductor 12 via the contact 13 and is inserted into the other opening 11 of the shield 7.
- the other main circuit conductor end 22 is connected to the other end of the adapter conductor 12 via another contact 13.
- the contactor 13 is a contactor whose contact portion with the main circuit conductor 2 is slidable in the direction of the axis 3, for example, a tulip-shaped contactor.
- the contact 13 is configured by bundling a plurality of contact pieces arranged in the circumferential direction from the outside with a garter spring 14, and the end 22 is press-fitted into the contact 13, and the adapter conductor 12 is electrically connected. Therefore, the end portions 22 that face each other are electrically connected to each other through, for example, the contact 13 and the adapter conductor 12.
- the connection work of the main circuit conductors 2 becomes easy. Further, by making the contact 13 a contact whose contact portion is slidable in the direction of the axis 3, even when the main circuit conductor 2 is thermally expanded and contracted in the direction of the axis 3, for example, according to the expansion and contraction of the main circuit conductor 2. Thus, when the end portion 22 in contact with the contactor 13 moves, the expansion and contraction is absorbed, and an excessive stress accompanying the expansion and contraction is not applied to the connection portion.
- the contact 13 becomes a heat source when energized, but since the contact 13 is disposed inside the barrel-shaped shield 7, the heat dissipation is improved due to the internal space and the surface area of the shield 7, The thermal influence of the main circuit conductor 2 due to the temperature rise can be reduced.
- the shield 7 holds the main circuit conductor 2 in the metal container 1 via the adapter conductor 12 and the contact 13.
- the shield 7 covers the end 22 of the main circuit conductor 2.
- the adapter conductor 12 can also be integrated with the shield 7.
- the shield 7 is made of, for example, aluminum, but when the adapter conductor 12 is integrated with the shield 7, the adapter conductor 12 is also made of, for example, aluminum.
- the adapter conductor 12 is made of a material having higher conductivity, such as copper.
- the shield 7 is made of, for example, aluminum without changing its material, and only the adapter conductor 12 is made of, for example, copper. This can lead to cost reduction.
- the connection structure of the contacts 13 is simplified by using the adapter conductor 12.
- the outer diameter of the end 22 is smaller than the outer diameter ⁇ d 1 of the main circuit conductor 2, this is because the gap between the opening 11 of the shield 7 and the main circuit conductor 2 is made larger. This is because the heat generated from the contact 13 during energization can be easily released to the outside of the shield 7 and the heat dissipation can be further improved.
- the diameter of the opening 11 of the shield 7 is, for example, larger than the outer diameter ⁇ d 1 of the main circuit conductor 2, and this also has the same effect.
- the insulating spacer 6 and the shield 7 are regions 29 defined by the inner diameter of the branch pipe 5 when viewed in a plan view from a direction parallel to the branch direction of the branch pipe 5 (the axial direction of the branch pipe 5). It is arranged within the range. That is, when the inner diameter of the branch pipe 5 and .phi.d 3, the entire insulating spacer 6 and the shield 7, in the plan view, it is preferably present in defined are for instance in a circular region 29 at the inner diameter .phi.d 3. By doing so, the insulating spacer 6 and the shield 7 can be installed in the metal container 1 through the branch pipe 5 after the insulating spacer 6 and the shield 7 are assembled outside the metal container 1, and the assembly is facilitated. For example, when the inner diameter of the branch pipe 5 is not constant with respect to the axial direction of the branch pipe 5, the entire insulating spacer 6 and shield 7 may be present in the region defined by the minimum inner diameter. Good.
- V is the potential of the main circuit conductor 2
- a lid 17 is attached to the branch pipe 16 with, for example, a bolt or the like.
- the lid 17 seals the metal container 1.
- the length of the shield 7 in the direction of the axis 3 is preferably shorter than the inner diameter of the branch pipe 16.
- the electric field concentrated on each end of the shield 7 and the main circuit conductor 2 is reduced by making the outer diameter of the shield 7 larger than the outer diameter of the main circuit conductor 2. can do.
- the electric field concentrated on each edge part of the shield 7 and the main circuit conductor 2 can be relieve
- the radius of curvature of the central portion of the shield 7 is increased due to the barrel shape, so that the electric field around the central portion can be relaxed. Therefore, according to this Embodiment, the whole electric field in the metal container 1 can be relieve
- the insulating spacer 6 and the shield 7 are defined by the inner diameter of the branch pipe 5 when viewed in plan from a direction parallel to the branch direction of the branch pipe 5 (the axial direction of the branch pipe 5). Since the insulating spacer 6 and the shield 7 are assembled outside the metal container 1 and then installed in the metal container 1 through the branch pipe 5, the assemblability is improved. To do. Further, by assembling the insulating spacer 6 and the shield 7 outside the metal container 1, it is easier to clean and inspect after assembly than when assembled inside the metal container 1, and foreign metal is mixed into the metal container 1. This reduces the possibility of adversely affecting the insulation performance of the gas insulated bus.
- the structure of the insulating spacer 6 is simpler than that of a multi-leg structure such as a bipod or tripod or a conical shape. As a result, assembly workability is improved. Further, by using the single-leg insulating spacer 6, the surface area of the insulating spacer 6 is reduced as compared with the case of a plurality of legs, and the possibility that metal foreign matters adhere to the insulating spacer 6 is reduced. If the single-leg insulating spacer 6 is installed above the main circuit conductor 2, even if a metal foreign object behaves on the bottom surface of the metal container 1 during operation, the possibility of adhering to the insulating spacer 6 is further reduced. Become.
- the manufacturing cost of the metal container 1 can be reduced.
- the recessed portion 8 is provided by using the swollen space in the central portion of the barrel-shaped shield 7, and at least a part of the embedded electrode 10 is disposed in the recessed portion 8, thereby The electric field can be relaxed, and the diameter of the metal container 1 can be reduced.
- the structure which does not form the recessed part 8 in the shield 7 is also possible.
- At least a part of the embedded electrode 9 on the metal container 1 side is located outside the region defined by the inner diameter of the main cylinder of the metal container 1 with the axis 3 as the center. Therefore, the electric field around the embedded electrode 9 is relaxed.
- at least a part of the embedded electrode 9 can be disposed outside the region defined by the inner diameter of the main cylinder of the metal container 1, thereby relaxing the electric field. Therefore, it is not necessary to increase the inner diameter of the main cylinder of the metal container 1.
- the end portions 22 are electrically connected to each other through the contact 13 in the shield 7, so that the connection work of the main circuit conductor 2 is facilitated.
- a bolt fastening operation is required in the metal container 1 having a large space restriction in assembling work.
- the end portion 22 is used. Can be easily connected by simply inserting it into the contact 13. Further, by making the contact 13 a contact whose contact portion is slidable in the direction of the axis 3, for example, thermal expansion and contraction in the direction of the axis 3 of the main circuit conductor 2 can be absorbed in dimension.
- the adapter conductor 12 is interposed in the connection between the end portions 22, the connection structure between the contacts 13 is simplified. Further, making the adapter conductor 12 separate from the shield 7 is also suitable when the material of the adapter conductor 12 needs to be different from the material of the shield 7.
- FIG. 5A is a diagram showing another connection form between the end portions 22.
- a shield 27 is attached to the insulating spacer 6 via the embedded electrode 10.
- the shield 27 is similar to the shield 7 in that the outer shape is substantially barrel-shaped and the concave portion 8 is formed on a part of its outer surface, but the inner shape thereof is different from that of the shield 7. That is, the openings 11 at both ends of the shield 27 are cylindrical, and the inner diameter thereof is slightly smaller than the outer diameter of the end 22 of the main circuit conductor 2.
- the annular groove is provided in the inner peripheral surface of the both ends of the shield 27, respectively,
- the annular coil spring contactor 28 is arrange
- two coil spring contacts 28 are provided at each end of the shield 27, but one or three or more may be used.
- not only the coil spring contact 18 but other band-shaped contacts that can cover almost the entire circumference of the end portion 22 and have the same effect may be applied.
- the outer diameter of the end 22 may be the same as the outer diameter of the main circuit conductor 2, and the inner diameter of the coil spring contact 28 may be increased.
- the shape of the end 22 of the main circuit conductor 2 can be simplified, and the thermal influence due to the temperature rise of the coil spring contact 28 can be reduced.
- the coil spring contact 28 is disposed in the groove of the shield 27b.
- the end 22 is inserted into and contacted with the annular coil spring contact 28, and is electrically connected to the shield 27.
- the end portions 22 are electrically connected to each other via the shield 27 by contacting the coil spring contacts 28.
- the contact portion between the coil spring contact 28 and the end portion 22 is slidable in the direction of the axis 3 similarly to the contact 13 of FIG.
- one shield 7 and one adapter conductor 12 may be used for connection between the end portions 22, for example, two of them are used on both sides of a conical spacer.
- the number of parts is reduced and the dimensions of the connecting portion in the direction of the axis 3 are shortened and within the range of the region 29 defined by the inner diameter of the branch pipe 5 as compared with the conventional configuration in which one piece is disposed at a time.
- the shield 7 is disposed on the metal container 1 and the above-described effect of assembling outside the metal container 1 is easily achieved.
- the diameter of the end 22 of the main circuit conductor 2 connected to the contact 13 is smaller than the diameter ⁇ d 1 of the portion other than the end 22 of the main circuit conductor 2.
- the diameter of the opening 11 of the shield 7 is larger than the outer diameter of the main circuit conductor 2.
- a gap between the end portion of the shield 7 and the main circuit conductor 2 can be made large, and the same effect as described above can be obtained, and portions other than the end portion 22 of the main circuit conductor 2 can be assembled or energized. Even when approaching the opening 11 at the time of thermal expansion due to, the main circuit conductor 2 and the shield 7 do not come into contact with each other and are damaged, which contributes to improvement in reliability.
- the balance (insulation coordination) between the electric field on the surface of the main circuit conductor 2 and the electric field on the surface of the shield 7 is taken,
- the diameter of the metal container 1 can be optimized and reduced.
- the insulating spacer 6 is configured to support the shield 7 from the inner upper side of the metal container 1, for example, so that the insulating spacer 6 has a metal foreign substance that behaves in the metal container 1 under the operating voltage. Is difficult to adhere, and the reliability of the insulation performance is improved.
- the branch pipe 5 is also disposed on the upper part of the metal container 1, and the heat radiation is improved by the heat radiation from the main circuit conductor 2 and the contact 13 escaping to the internal space of the branch pipe 5.
- the branch pipe 16 is provided at the lower part of the metal container 1, so that the metal foreign object behaving in the branch pipe 16 under the operating voltage is dropped and captured. can do. Since the outer diameter of the shield 7 is larger than the outer diameter of the main circuit conductor 2 and the electric field is higher in the vicinity of the shield 7, the behavior of the metallic foreign matter is intense, and the phenomenon of the metallic foreign matter approaching the shield 7 is likely to occur. Therefore, providing the branch pipe 16 below the shield 7 is effective for capturing metal foreign objects. Further, the branch pipe 16 also becomes a manhole for visual confirmation when the main circuit conductor 2 is connected to the contact 13 in a state where the lid 17 is removed, and the assembling workability and reliability are improved.
- the axis of the main circuit conductor 2 and the axis 3 are made to coincide with each other, but they can be arranged eccentrically.
- the main circuit conductor 2 can be arranged eccentrically below the axis 3.
- the metal foreign matter behaving in the metal container 1 under the operating voltage is likely to adhere to the main circuit conductor 2 or the insulating spacer 6. That is, in this embodiment, the reliability of the insulation performance is further improved.
- the length of the shield 7 in the direction of the axis 3 is preferably shorter than the inner diameter of the branch pipe 16.
- FIG. FIG. 6 is a longitudinal sectional view of a gas insulating bus according to the present embodiment
- FIG. 7 is a detailed view of a portion A in FIG. 6,
- FIG. 8 is a sectional view taken along line BB in FIG.
- a three-phase metal container 1 filled with an insulating gas such as sulfur hexafluoride (SF 6 ) has a three-phase structure.
- the main circuit conductors 2a to 2c are stored together.
- the metal container 1 is arranged, for example, with the axis 3 that is the central axis of the main trunk thereof being horizontal.
- the metal container 1 may be arranged vertically or tilted.
- the main circuit conductors 2a to 2c extend in parallel to the axis 3 respectively.
- the main circuit conductors 2a to 2c are, for example, circular in cross section and the outer shape of the cross section is circular.
- the main circuit conductors 2a to 2c are arranged, for example, at each vertex of an equilateral triangle in a cross section orthogonal to the axis 3 (FIG. 8). That is, the distances from the axis 3 to the central axes of the main circuit conductors 2a to 2c are equal to each other, and the respective directions form an angle difference of 120 °.
- the main circuit conductor 2b and the main circuit conductor 2c are disposed at the same height, for example, and the main circuit conductor 2a is disposed above the main circuit conductors 2b and 2c.
- the equilateral triangle determined by the arrangement of the main circuit conductors 2a to 2c has one side that is horizontal and one vertex that is located above the one side.
- the main circuit conductors 2a to 2c are not necessarily arranged at the positions of the vertices of the equilateral triangle.
- the positions of the vertices of the isosceles triangle or other triangles may be used, but the equilateral triangle is most preferable in terms of insulation performance. .
- the side surfaces of the metal container 1 are provided with branch pipes 5a to 5c, 16 at regular intervals, for example, in the direction of the axis 3.
- the branch pipe 5a branches, for example, upward
- the branch pipe 5b branches, for example, in one obliquely downward direction that forms 120 ° with the branch direction of the branch pipe 5a
- the branch pipe 5c includes, for example, both the branch pipes 5a, 5b. Branches in the other diagonally downward direction at 120 ° with the branching direction.
- the branch pipe 16 is branched downward, for example.
- the branch pipes 5a to 5c, 16 are, for example, cylindrical branches, and are branched, for example, in a direction substantially orthogonal to the direction of the axis 3.
- the inner diameters of the branch pipes 5a to 5c are equal to each other, for example.
- a lid 15a is attached to the branch pipe 5a with, for example, bolts, and an insulating spacer 6a is attached to the lid 15a.
- the insulating spacer 6a has a single leg structure, for example.
- An embedded electrode 9a which is an embedded electrode on the metal container side, is embedded in one end of the insulating spacer 6a, and this embedded electrode 9a is fixed to the lid 15a with, for example, a bolt or the like. That is, one end portion of the insulating spacer 6a is attached to the lid 15a which is a part of the metal container 1 via the embedded electrode 9a, and is disposed in the branch pipe 5a.
- the inner diameter of the branch pipe 5a can be set to be equal to or smaller than the inner diameter of the main barrel of the metal container 1, for example.
- the inner diameter of the branch pipe 16 can be made equal to or smaller than the inner diameter of the main barrel of the metal container 1.
- the embedded electrode 9a is located outside the region defined by the inner diameter of the main barrel of the metal container 1 with the axis 3 as the center.
- An embedded electrode 10a which is an embedded electrode on the shield side, is embedded in the other end of the insulating spacer 6a.
- a substantially barrel-shaped metal shield 7a is attached to the other end of the insulating spacer 6a via an embedded electrode 10a.
- the shield 7a is fixed to the embedded electrode 10a using a bolt or the like, for example.
- the shield 7a has a hollow structure through which the current-carrying part of the main circuit passes in the direction of the axis 3 and has openings 11a at both ends in the direction of the axis 3 respectively.
- the diameter of the opening part 11a of the shield 7a is larger than the outer diameter of the main circuit conductor 2a, for example.
- the outer diameter of the shield 7a is larger than the outer diameter of the main circuit conductor 2a regardless of the position in the direction of the axis 3.
- annular plate-like annular portion 18a is provided along the inner periphery of the shield 7a at the substantially central portion in the direction of the axis 3.
- a substantially cylindrical adapter conductor 12a is inserted into the annular portion 18a, and the adapter conductor 12a is fixed and supported by the annular portion 18a via a flange portion 19a.
- a recess 8a is formed on a part of the outer surface of the shield 7a on the side of the branch pipe 5a.
- the other end of the insulating spacer 6a is disposed in the recess 8a, and the insulating spacer 6a is disposed so as to be sandwiched between the shields 7a.
- at least a part of the embedded electrode 10a is disposed in the recess 8a.
- the end portions 22a of the main circuit conductors 2a connected to each other are arranged to face each other. That is, the end 22a of one main circuit conductor is inserted into one opening 11a of the shield 7a, and the end 22a of the other main circuit conductor is inserted into the other opening 11a of the shield 7a.
- the end portions 22a are arranged to face each other at a predetermined distance, and the adapter conductor 12a is arranged between the end portions 22a.
- the end 22a has, for example, a circular outer shape in cross section, and its outer diameter is smaller than, for example, the outer diameter of the other part of the main circuit conductor 2a.
- the end 22a of one main circuit conductor inserted into one opening 11a of the shield 7a is connected to one end of the adapter conductor 12a through the contact 13a, and is inserted into the other opening 11a of the shield 7a.
- the other main circuit conductor end 22a is connected to the other end of the adapter conductor 12a through another contact 13a.
- the contactor 13a is a contactor whose contact point with the main circuit conductor 2a is slidable in the direction of the axis 3 and is, for example, a tulip-shaped contactor.
- the contact 13a is configured by bundling a plurality of contact pieces arranged in the circumferential direction around the axis of the main circuit conductor 2a with a garter spring 14a from the outside, and the end 22a is in contact with the contact 22a. It is press-fitted into the child 13a and is electrically connected to the adapter conductor 12a. Therefore, the end portions 22a facing each other are electrically connected to each other through, for example, the contact 13a and the adapter conductor 12a. Note that, as described in the first embodiment, it is possible to connect the end portions 22a without using the adapter conductor 12a.
- the shield 7a holds the main circuit conductor 2a in the metal container 1 via the adapter conductor 12a and the contact 13a.
- the shield 7a covers the end 22a of the main circuit conductor 2a.
- the insulating support structure of the main circuit conductor 2a by the insulating spacer 6a, the shield 7a, the adapter conductor 12a, and the contact 13a as described above is the same as the insulating support structure of the main circuit conductor 2 described in the first embodiment. .
- an insulating spacer 6b for insulatingly supporting the main circuit conductor 2b, a shield 7b attached to the insulating spacer 6b, embedded electrodes 9b and 10b embedded in the insulating spacer 6b, A branch pipe 5b, a lid 15b, and the like are shown.
- a lid 17 is attached to the branch pipe 16 with, for example, a bolt or the like.
- the lid 17 seals the metal container 1.
- the connecting operation of the main circuit conductors 2a to 2c can be visually confirmed from the outside of the metal container 1 through the branch pipe 16 with the lid 17 removed.
- the length of the shields 7a to 7c in the direction of the axis 3 is preferably shorter than the inner diameter of the branch pipe 16. This is because the visibility when the main circuit conductors 2a to 2c are connected is improved, and the reliability of the assembly work is further improved.
- the branch pipe 16 is arrange
- the metal container 1 since the three-phase main circuit conductors 2a to 2c are collectively stored in the metal container 1, the metal container 1 is compared with the phase-separated configuration shown in the first embodiment. Can be reduced.
- the arrangement of the three-phase main circuit conductors 2a to 2c in the metal container 1 is, for example, an equilateral triangle in the cross section orthogonal to the axis 3, so that the main circuit conductor 2a
- the distance between ⁇ 2c is equal to each other, the insulation distance between phases can be most effectively secured, and the electromagnetic force at the time of short-circuiting between phases can also be reduced.
- the arrangement of the three-phase main circuit conductors 2a to 2c in the metal container 1 is an equilateral triangle as described above, and for example, one side of the equilateral triangle is horizontal and the equilateral triangle Since the top of each of the main circuit conductors 2a to 2c can be kept as close as possible to the lower part of the metal container 1 where the metal foreign matter may be deposited, It is possible to suppress the behavior of the metallic foreign object below.
- the three-phase main circuit conductors 2a to 2c may be arranged in an equilateral triangle other than the above or in an arrangement other than the equilateral triangle.
- the branch pipe 16 is provided below the shield 7a covering the main circuit conductor 2a located at the top of the equilateral triangle among the three-phase main circuit conductors 2a to 2c in the metal container 1. Since it did in this way, the metal foreign material which behaves within the metal container 1 under an operating voltage can be captured efficiently. Further, the branch pipe 16 also becomes a manhole for visual confirmation when the main circuit conductors 2a to 2c are connected in a state where the lid 17 is removed, and assembling workability and reliability are improved.
- the length of the shields 7a to 7c in the direction of the axis 3 is shorter than, for example, the inner diameter of the branch pipe 16, so that the connection work through the branch pipe 16 is performed when the main circuit conductors 2a to 2c are connected. Visibility when proceeding while visually recognizing is improved.
- the other configurations, operations, and effects of the present embodiment are the same as those of the first embodiment except for the relationship of the expression (1) that is a feature of the phase separation type.
- the present invention is useful as a gas insulated bus.
Landscapes
- Installation Of Bus-Bars (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
Description
図1は、本実施の形態に係るガス絶縁母線の縦断面図、図2は、図1におけるA部の詳細図、図3は、図2におけるB-B断面図、図4は、図2におけるC-C矢視図である。
φd1<φD/e<φd2 ・・・(1)
であることが好ましい。これは次の理由からである。まず、主回路導体2と金属容器1とが同軸円筒であるとき、この間の空間における電界の大きさEは、
E=V/(x/2・ln(φD/2x))・・・(2)
で与えられる。ここで、Vは主回路導体2の電位、xは軸線3から径方向の任意の距離である。これから、電界の大きさEは、2x=φD/eで最小値をとることがわかる。そこで、主回路導体2の外径φd1とシールド7の最大外径φd2とを、電界の大きさが最小となる径φD/eを挟むように設定すれば、双方の電界をバランス良く小さくし、母線全体としての最大電界値を低減することができる。
図6は、本実施の形態に係るガス絶縁母線の縦断面図、図7は、図6におけるA部の詳細図、図8は、図7におけるB-B断面図である。
2,2a-2c 主回路導体
3 軸線
4 フランジ
5,5a-5c,16 枝管
6,6a-6c 絶縁スペーサ
7,7a-7c,27,27b シールド
8,8a 凹部
9,9a-9c,10,10a-10c 埋込電極
11,11a 開口部
12,12a アダプタ導体
13,13a 接触子
14,14a ガータスプリング
15,15a-15c,17 蓋
18,18a 円環部
19,19a 鍔部
22,22a 端部
28 コイルばね接触子
29 領域
Claims (17)
- 内部に絶縁ガスが充填されて配置された円筒状の金属容器と、
この金属容器内に収納され、前記金属容器の主胴の軸線と平行に延伸するとともに、断面の外形が円形状の主回路導体と、
前記金属容器内で前記主胴の軸線方向に所定の間隔で配置され、一端部が前記金属容器に取り付けられるとともに他端部にて前記主回路導体を前記金属容器内で電気的に絶縁して保持することにより、前記主回路導体を前記金属容器内で絶縁支持する単脚の構造の絶縁スペーサと、
この絶縁スペーサの前記他端部に取り付けられ、前記主回路導体の外径よりも大きい外径を有し、内部に前記主回路導体が挿入されるとともに、前記主回路導体を前記金属容器内で保持する略樽形形状の金属製のシールドと、
前記金属容器の側面に設けられ、前記絶縁スペーサの設置箇所に応じて前記軸線方向に前記所定の間隔で配置されるとともに、前記軸線と略直交する方向に分岐して前記絶縁スペーサの前記一端部が内部に配置された枝管と、
を備え、
前記絶縁スペーサおよび前記シールドは、前記枝管の分岐方向に平行な方向から平面視したときに、前記枝管の内径で規定される領域の範囲内に配置されることを特徴とするガス絶縁母線。 - 前記枝管の内径は、前記金属容器の主胴の内径以下であることを特徴とする請求項1に記載のガス絶縁母線。
- 前記シールドの外面の一部に凹部が形成され、
前記絶縁スペーサの前記他端部にはシールド側の埋込電極が埋込まれ、
前記絶縁スペーサの前記他端部は前記凹部にて前記シールドに取り付けられ、
前記シールド側の埋込電極の少なくとも一部は前記凹部内に配置されていることを特徴とする請求項1に記載のガス絶縁母線。 - 前記絶縁スペーサの前記一端部には金属容器側の埋込電極が埋込まれ、
この金属容器側の埋込電極の少なくとも一部は、前記軸線を中心として前記主胴の内径により規定される領域の外側に配置されていることを特徴とする請求項1に記載のガス絶縁母線。 - 前記軸線方向における前記シールドの一方の開口部には一方の前記主回路導体の端部が挿入され、
前記軸線方向における前記シールドの他方の開口部には他方の前記主回路導体の端部が挿入され、
双方の前記主回路導体の端部同士が前記シールド内で対向して配置され、
前記端部同士は、接点部が前記軸線方向に摺動可能な接触子を介して互いに電気的に接続されていることを特徴とする請求項1に記載のガス絶縁母線。 - 前記一方の主回路導体の端部と前記他方の主回路導体の端部との間には前記シールドに固定されたアダプタ導体が配置され、
前記一方の主回路導体の端部と前記アダプタ導体とが一方の前記接触子により互いに接続され、
前記他方の主回路導体の端部と前記アダプタ導体とが他方の前記接触子により互いに接続されていることを特徴とする請求項5に記載のガス絶縁母線。 - 前記接触子と接続する前記主回路導体の端部の径は、当該主回路導体の前記端部以外の部分の径よりも小さいことを特徴とする請求項5に記載のガス絶縁母線。
- 前記シールドの前記開口部の径は、前記主回路導体の外径よりも大きいことを特徴とする請求項5に記載のガス絶縁母線。
- 前記金属容器内には一相分の前記主回路導体が配置収納され、
前記金属容器の主胴の内径の1/e(e:自然対数の底)倍が、前記主回路導体の外径よりも大きく、かつ、前記シールドの最大外径よりも小さいことを特徴とする請求項1に記載のガス絶縁母線。 - 前記金属容器は長手方向を水平にして配置されていることを特徴とする請求項1に記載のガス絶縁母線。
- 前記絶縁スペーサは、前記金属容器の上部から前記シールドを支持することを特徴とする請求項10に記載のガス絶縁母線。
- 前記シールドの下方に前記枝管とは異なる下部枝管が前記金属容器の側面に設けられていることを特徴とする請求項10に記載のガス絶縁母線。
- 前記金属容器内に三相の前記主回路導体が一括して収納されていることを特徴とする請求項1に記載のガス絶縁母線。
- 前記金属容器内における三相の前記主回路導体の配置は、前記軸線と直交する断面において、正三角形を成すことを特徴とする請求項13に記載のガス絶縁母線。
- 前記金属容器内における三相の前記主回路導体の配置は、前記正三角形の一辺が水平でかつ前記正三角形の一頂点が当該一辺の上方に位置するような配置であることを特徴とする請求項14に記載のガス絶縁母線。
- 前記金属容器内の三相の前記主回路導体のうち最も高い位置に配置された前記主回路導体を覆う前記シールドの下方に前記枝管とは異なる下部枝管が前記金属容器の側面に設けられていることを特徴とする請求項15に記載のガス絶縁母線。
- 前記シールドの前記軸線方向の長さは、前記下部枝管の内径よりも短いことを特徴とする請求項12または16に記載のガス絶縁母線。
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US13/879,525 US9269475B2 (en) | 2010-11-15 | 2010-11-15 | Gas-insulated bus bar |
PCT/JP2010/070299 WO2012066614A1 (ja) | 2010-11-15 | 2010-11-15 | ガス絶縁母線 |
JP2011507753A JP4741037B1 (ja) | 2010-11-15 | 2010-11-15 | ガス絶縁母線 |
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US10707667B2 (en) | 2011-02-28 | 2020-07-07 | Mitsubishi Electric Corporation | Gas insulated bus |
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CN104143801A (zh) * | 2013-09-26 | 2014-11-12 | 国家电网公司 | 导电杆支撑结构及使用该导电杆支撑结构的管道母线 |
CN112133504B (zh) * | 2020-07-30 | 2022-05-10 | 河南平芝高压开关有限公司 | 一种三支撑绝缘子固定结构及gil |
CN113808798B (zh) * | 2021-09-14 | 2022-06-07 | 西安交通大学 | 一种超/特高压gis/gil母线 |
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JP4741037B1 (ja) | 2011-08-03 |
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