Telescopic conductor and installation method

Abstract

The invention relates to a telescopic conductor and an installation method, the telescopic conductor comprises an outer conductor and an inner conductor slidably connected in the outer conductor, the inner conductor is provided with a spring contact finger connected with the outer conductor, and the inner conductor is also connected with a guide rod located in the outer conductor. And the outer conductor is also connected with a shielding cover for preventing the inner conductor from sliding. During use and GIS (Gas Insulated Switchgear) assembly, the bus cylinder can be firstly assembled, after the bus cylinder is assembled, the guide rod is inserted into the outer conductor, and the total length of the conductor is adjusted by utilizing the characteristic that the inner conductor slides in the outer conductor, so that the inner conductor of the bus cylinder can be conveniently mounted; compared with the operation of simultaneously ensuring the coaxiality of the bus cylinders and the coaxiality of the internal conductors due to the fact that the plurality of bus cylinders and the internal conductors are in butt joint together, through the arrangement of the internal conductors and the external conductors, the internal conductors are installed after the bus cylinders are installed, so that the installation operation is convenient.

Description

Technical Field

[0001] The invention relates to the field of GIS, in particular to the field of GIS installation technology, and specifically refers to a retractable conductor. Background Art

[0002] At present, there are two solutions for GIS internal conductors: one is to use a plum blossom contact with a conductor connector; the other is to directly insert the conductor connector into a contact holder with a spring contact finger. These two solutions are the most widely used. Each of the two solutions has its own advantages. The radial size adjustment of the conductor using a plum blossom contact is larger than that of the spring contact finger, but the axial adjustment of the spring contact finger solution is larger.

[0003] GIS equipment using the above two schemes have the same defects. When the GIS intervals are docked and installed, or when the GIS intervals need to be overhauled or repaired, the two adjacent intervals are likely to cause abnormal stress on the insulation support inside the busbar barrel during the docking or removal process. Because the intervals are connected through the busbar barrel, the busbar barrel and the internal conductor are installed and removed at the same time, and the connectors at both ends of the conductor are inserted into the plum blossom contacts on both sides. During the movement, the intervals have slightly larger movement fluctuations in the radial direction of the busbar, which can easily drive the internal conductor to move. There are guide rods on both sides of the conductor, which can easily pry and crack the busbar insulation support, causing flashover discharge.

[0004] Conventional conductors are made up of bolts, plugs and joints, and the joints on both sides are inserted into the guide rods in the plum blossom contacts. Conventional interval docking requires that multiple long conductors maintain good coaxiality with multiple plum blossom contacts in the busbar barrels on both sides, and at the same time, it is necessary to ensure that the two large-sized busbar barrels and their flanges maintain coaxiality within the specified error range, which makes installation difficult. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a retractable conductor. Compared with the conventional method in which several busbar tubes are connected together with internal conductors, and therefore the coaxiality of the busbar tubes and the coaxiality of the internal conductors need to be ensured at the same time, the internal conductor can be installed after the busbar tubes are installed, thereby facilitating the installation operation.

[0006] The present invention is achieved through the following technical solution: a retractable conductor, including an outer conductor and an inner conductor slidably connected to the outer conductor, the inner conductor is provided with a spring contact connected to the outer conductor, the inner conductor is also connected to a guide rod located inside the outer conductor, and the outer conductor is also connected to a shielding cover that prevents the inner conductor from sliding. When the present invention is in use, during GIS assembly, the busbar barrel can be assembled first. After the busbar barrel is assembled, personnel drill into the busbar barrel or install the outer conductor from the busbar barrel outlet, and insert the guide rod into the outer conductor. The total length of the conductor is adjusted by utilizing the characteristic that the inner conductor slides inside the outer conductor, thereby facilitating the installation of the conductor inside the busbar barrel. Compared with the traditional method in which several busbar barrels are conventionally docked together with the internal conductors, and therefore the coaxiality of the busbar barrel and the coaxiality of the internal conductor need to be ensured at the same time, by arranging the inner conductor and the outer conductor, the internal conductor can be installed after the installation of the busbar barrel is completed, thereby facilitating the installation operation.

[0007] Preferably, an annular step is provided in the inner cavity of the outer conductor, and the step extends obliquely from the outside to the inside. An annular protrusion is provided on the end face of the inner conductor located on the inner side of the outer conductor, and the outer diameter of the protrusion is larger than the maximum inner diameter of the step. The outer diameter of the guide rod is smaller than the minimum inner diameter of the step.

[0008] When the preferred solution is in use, the cooperation between the step and the protrusion limits the inner conductor from moving further into the inner part of the outer conductor, thereby playing a limiting role.

[0009] Preferably, the guide rod is threadably connected to the inner conductor and is coaxially arranged with the inner conductor, and the outer diameter of the guide rod is greater than the outer diameter of the inner conductor.

[0010] The setting of this preferred solution facilitates the connection between the guide rod and the inner conductor. By setting the diameter of the guide rod, when the outer conductor is tilted due to gravity, the guide rod can support the outer conductor at the first time. The inclination angle between the guide rod and the inner circumference of the outer conductor during support is affected by the length of the guide rod and the difference between the outer diameter of the guide rod and the inner diameter of the outer conductor.

[0011] Preferably, the inclination angle of the step is 5-10°.

[0012] This preferred solution provides data support during processing by setting the step angle, and the inclination angle can be determined according to the outer conductor diameter and the length margin of the inner conductor.

[0013] Preferably, the inner conductor is located inside the outer conductor and one end of which is connected to a limit joint connected to the electrical connection. The limit joint includes a first ring segment, a second ring segment, and a third ring segment which are coaxially arranged and have successively decreasing outer diameters. The third ring segment is connected to the inner conductor. An annular contact ring is elastically connected to the electrical connection. The inner diameter of the contact ring is adapted to the second ring segment. The end face of the contact ring close to the outer conductor is a guide surface for guiding the insertion of the first ring segment.

[0014] When this preferred solution is in use, the setting of the third ring segment facilitates the connection between the limit connector and the inner conductor, the setting of the first ring segment and the contact ring facilitates limiting the removal of the limit connector from the electrical connection, and the setting of the second ring segment ensures the contact connection between the contact ring and the limit connector.

[0015] Preferably, the second ring segment is provided with a withdrawal ring slidably connected along its axial direction, the withdrawal ring is conical, and the small diameter end of the withdrawal ring is located between the large diameter end and the third ring segment, the small diameter end of the withdrawal ring is adapted to the outer diameter of the second ring segment, and the diameter of the large diameter end of the withdrawal ring is adapted to the diameter of the first ring segment.

[0016] The preferred solution is to set a withdrawal ring so that when the limit joint needs to be removed from the electrical connection, the limit joint is driven to continue to move into the spring contact finger, and the withdrawal ring is guided by the guide surface to move into the interior of the electrical connection, and then drives the inner conductor to move into the outer conductor, even if the first ring segment moves toward the contact ring. The contact ring pushes the withdrawal ring to the top of the first ring segment, and under the guidance of the circumferential surface of the withdrawal ring, the opening of the contact ring piece is enlarged, and the contact ring is brought into contact with the circumferential surface of the first ring segment, thereby causing the first ring segment to detach from the electrical connection.

[0017] Preferably, the electrical connection is further provided with a guide column inserted into the first ring segment.

[0018] This preferred solution provides guiding and supporting functions through the provision of guide columns.

[0019] As a preferred embodiment, two inner conductors are provided, and the two inner conductors are symmetrically arranged. This preferred solution enables both ends of the outer conductor to be retractable, which further facilitates installation. An application of the retractable conductor in GIS equipment.

[0020] A method for using a retractable conductor comprises the following steps: In GIS equipment, after the interval busbar barrels are butt-jointed, the conductor is placed in the busbar barrel. One or two inner conductors are arranged in the outer conductor as required, that is, one end or both ends of the outer conductor can be retracted. If one inner conductor is selected, the other end of the outer conductor uses a conventional fixed joint, and one or two inner conductors are selected as required; Then, the shielding cover is put on the inner conductor, and the limit joint is threadedly connected to the inner conductor, and then the inner conductor is connected to the outer conductor, and the guide rod and the spring contact finger are inserted into the outer conductor, the guide rod passes through the step, and the protrusion is limited by the step and cannot pass through the step, and then the shielding cover is threadedly connected to the outer conductor, so as to limit the inner conductor and play a shielding role at the same time; Then, the busbar barrel is connected, and the personnel drill into the busbar barrel or install the outer conductor from the busbar barrel outlet. If there is a conventional fixed joint, install the conventional joint first, and then thread the limit joint on the spring contact finger, and then push the limit joint to move into the outer conductor. Due to the limiting effect of the step, the inner conductor will not completely enter the outer conductor. At the same time, the inner conductor overcomes the friction of the shielding cover and slides relative to the shielding cover; When the first ring segment and the contact seat are arranged coaxially, the limit connector is driven to be inserted into the contact seat, so that the first ring segment and the contact ring are squeezed into the electrical connection, and one end of the contact ring is pushed onto the second ring segment, and one end face of the contact ring is in contact and connected with the step surface formed between the first ring segment and the second ring segment. At this time, the guide ring is located on the outside of the contact ring, so the connection of the conductors is achieved. Compared with the conventional method of docking several busbar barrels, several busbar barrels are docked together with the internal conductors, so it is necessary to ensure the coaxiality of the busbar barrel and the coaxiality of the internal conductor at the same time. By setting the inner conductor and the outer conductor, the internal conductor can be installed after the installation of the busbar barrel is completed, so the installation operation is convenient. When it is necessary to remove the limit joint from the electrical connection, the limit joint is driven to continue to move into the spring contact finger, and the withdrawal ring is moved to the inside of the electrical connection under the guidance of the guide surface, that is, at this time, the withdrawal ring and the first ring segment are located on the same side, and then the inner conductor is driven to move into the outer conductor, even if the first ring segment moves toward the contact ring, the contact ring pushes the withdrawal ring to the top of the first ring segment, and under the guidance of the circumferential surface of the withdrawal ring, the opening of the contact ring piece is enlarged, and the contact ring is in contact with the circumferential surface of the first ring segment, thereby causing the first ring segment to detach from the electrical connection. The beneficial effects of the present invention are as follows: when assembling GIS, the busbar barrel can be assembled first. After the busbar barrel is assembled, personnel drill into the busbar barrel or install the outer conductor from the pull-out port of the busbar barrel, and insert the guide rod into the outer conductor. The total length of the conductor is adjusted by utilizing the characteristic that the inner conductor slides in the outer conductor, thereby facilitating the installation of the conductor inside the busbar barrel. Compared with the traditional method in which several busbar barrels are conventionally docked together with the internal conductors, and therefore the coaxiality of the busbar barrel and the coaxiality of the internal conductor need to be ensured at the same time, by arranging the inner conductor and the outer conductor, the internal conductor can be installed after the installation of the busbar barrel is completed, thereby facilitating the installation operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a partial exploded view of the structure of the present invention; Figure 3 It is a schematic diagram of the busbar barrel of the present invention; Figure 4 A schematic diagram of the steps for disengaging the electrical connection of the limit connector; Figure 5It is a schematic diagram of busbar connection in the prior art; Figure 6 It is a schematic diagram of the internal conductor of the busbar barrel in the prior art; As shown in the figure: 1. Outer conductor, 2. Inner conductor, 3. Spring contact finger, 4. Step, 5. Guide rod, 6. Shielding cover, 7. Limit joint, 8. Retraction ring, 9. Contact ring, 10. Electrical connection, 11. Guide column, 12. Busbar tube, 71. First ring segment, 72. Second ring segment, 73. Third ring segment. DETAILED DESCRIPTION

[0022] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0023] See attached Figure 1-6 The present invention discloses a retractable conductor, comprising an outer conductor 1, and an inner conductor 2 slidably connected to the outer conductor 1, wherein the inner conductor 2 is provided with a spring contact finger 3 connected to the outer conductor 1, the inner conductor 2 is also connected to a guide rod 5 located in the outer conductor 1, and the outer conductor 1 is also connected to a shielding cover 6 for preventing the inner conductor 2 from sliding. An annular step 4 is also provided in the inner cavity of the outer conductor 1. The step 4 extends obliquely from the outside to the inside. The surface of the step 4 is an annular conical surface. The inner diameter of the conical surface gradually decreases from the outside to the inside. The inclination angle of the step 4 is 5-10°.

[0024] The inner conductor 2 is provided with an annular protrusion on the end surface located inside the outer conductor 1 , the outer diameter of the protrusion is larger than the maximum inner diameter of the step 4 , and the outer diameter of the guide rod 5 is smaller than the minimum inner diameter of the step 4 .

[0025] The guide rod 5 is threadedly connected to the inner conductor 2 and is coaxially arranged with the inner conductor 2 . The outer diameter of the guide rod 5 is greater than the outer diameter of the inner conductor 2 .

[0026] The inner conductor 2 is located inside the outer conductor 1 and one end of the inner conductor 2 is connected to a limit joint 7 connected to the electrical connection 10. The limit joint 7 includes a first ring segment 71, a second ring segment 72, and a third ring segment 73 which are coaxially arranged and have successively decreasing outer diameters. The third ring segment 73 is connected to the inner conductor 2. An annular contact ring 9 is elastically connected to the electrical connection 10. The contact ring includes a plurality of elastic contacts arranged circumferentially. The elastic contacts are prior art. The inner diameter of the contact ring 9 is matched with the outer diameter of the second ring segment 72. The end face of the contact ring 9 close to the outer conductor 1 is a guide surface for guiding the insertion of the first ring segment 71.

[0027] The second ring segment 72 is provided with a guide-back ring 8 slidably connected along the axial direction thereof, and the material of the guide-back ring is polytetrafluoroethylene.

[0028] The deflection ring 8 is conical, and the small diameter end of the deflection ring 8 is located between the large diameter end and the third ring segment 73 . The small diameter end of the deflection ring 8 is adapted to the outer diameter of the second ring segment 72 , and the diameter of the large diameter end of the deflection ring 8 is adapted to the diameter of the first ring segment 71 .

[0029] The electrical connection 10 is further provided with a guide post 11 inserted into the first ring segment 71 .

[0030] The application of the retractable conductor in GIS equipment is to connect one or two of the outer conductors 1 according to actual needs, and when there are two inner conductors 2, the two inner conductors 2 are symmetrically arranged.

[0031] A method for using a retractable conductor comprises the following steps: In the GIS equipment, after the spacer busbar barrels 12 are butt-jointed, the conductor is placed in the busbar barrel 12. One or two inner conductors 2 are arranged in the outer conductor 1 as required, that is, one end or both ends of the outer conductor 1 are telescopically telescopic. If one inner conductor 2 is selected, the other end of the outer conductor 1 adopts a conventional fixed joint, and one or two inner conductors 2 are selected as required; Then, the shielding cover 6 is put on the inner conductor 2, and the limiting joint 7 is threadedly connected to the inner conductor 2, and then the inner conductor 2 is connected to the outer conductor 1, and the guide rod 5 and the spring contact finger 3 are inserted into the outer conductor 1, the guide rod 5 passes through the step 4, and the protrusion is limited by the step 4 and cannot pass through the step 4, and then the shielding cover 6 is threadedly connected to the outer conductor 1, so as to limit the inner conductor 2 and play a shielding role at the same time; Then, the busbar barrel 12 is docked, and the personnel drill into the busbar barrel 12 or install the outer conductor 1 from the busbar barrel 12. If there is a conventional fixed joint, the conventional joint is installed first, and then the limit joint 7 is threadedly connected to the spring contact finger 3, and then the limit joint 7 is pushed to move into the outer conductor 1. Due to the limiting effect of the step 4, the inner conductor 2 will not completely enter the outer conductor 1. At the same time, the inner conductor 2 overcomes the friction of the shielding cover 6 and slides relative to the shielding cover 6; When the first ring segment 71 is coaxially arranged with the contact seat, the limit joint 7 is driven to be inserted into the contact seat, so that the first ring segment 71 and the contact ring 9 are squeezed and then enter the electrical connection 10, and one end of the contact ring 9 is pushed onto the second ring segment 72, and one end face of the contact ring 9 is in contact and connected with the step surface formed between the first ring segment 71 and the second ring segment 72. At this time, the detent ring 8 is located on the outside of the contact ring 9, so the connection of the conductors is realized. Compared with the conventional method in which several busbar barrels 12 are docked together with the internal conductors, so it is necessary to ensure the coaxiality of the busbar barrel 12 and the coaxiality of the internal conductor at the same time, by setting the inner conductor 2 and the outer conductor 1, the internal conductor is installed after the installation of the busbar barrel 12 is completed, so as to facilitate the installation operation; When it is necessary to remove the limit joint 7 from the electrical connection 10, the limit joint 7 is driven to continue to move into the spring contact finger 3, and the withdrawal ring 8 is moved to the inside of the electrical connection 10 under the guidance of the guide surface, that is, at this time, the withdrawal ring 8 and the first ring segment 71 are located on the same side, and then the inner conductor 2 is driven to move into the outer conductor 1, that is, the first ring segment 71 moves toward the contact ring 9, and the contact ring 9 pushes the withdrawal ring 8 to the first ring segment 71. Under the guidance of the circumferential surface of the withdrawal ring 8, the opening of the contact ring piece is enlarged, and the contact ring 9 is in contact with the circumferential surface of the first ring segment 71, so that the first ring segment 71 is detached from the electrical connection 10.

[0032] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A retractable conductor, characterized in that: The invention comprises an outer conductor (1), and an inner conductor (2) slidably connected inside the outer conductor (1); the inner conductor (2) is provided with a spring contact finger (3) connected to the outer conductor (1); the inner conductor (2) is also connected to a guide rod (5) located inside the outer conductor (1); and the outer conductor (1) is also connected to a shielding cover (6) for preventing the inner conductor (2) from sliding.

2. The retractable conductor according to claim 1, characterized in that: An annular step (4) is also provided in the inner cavity of the outer conductor (1), and the step (4) extends obliquely from the outside to the inside. The inner conductor (2) is provided with an annular protrusion on the end surface located on the inner side of the outer conductor (1), and the outer diameter of the protrusion is greater than the maximum inner diameter of the step (4). The outer diameter of the guide rod (5) is smaller than the minimum inner diameter of the step (4).

3. The retractable conductor according to claim 2, characterized in that: The guide rod (5) is threadably connected to the inner conductor (2) and is coaxially arranged with the inner conductor (2); the outer diameter of the guide rod (5) is greater than the outer diameter of the inner conductor (2).

4. The retractable conductor according to claim 2, characterized in that: The inclination angle of the step (4) is 5-10°.

5. The retractable conductor according to claim 3 or 4, characterized in that: One end of the inner conductor (2) located outside the outer conductor (1) is connected to a limit joint (7) connected to an electrical connection (10); the limit joint (7) comprises a first ring segment (71), a second ring segment (72), and a third ring segment (73) which are coaxially arranged and have outer diameters that decrease in sequence; the third ring segment (73) is connected to the inner conductor (2); an annular contact ring (9) is elastically connected to the electrical connection (10); the inner diameter of the contact ring (9) is adapted to the second ring segment (72); and the end surface of the contact ring (9) close to the outer conductor (1) is a guide surface for guiding the first ring segment (71) for insertion.

6. The retractable conductor according to claim 5, characterized in that: The second ring segment (72) is provided with a guide ring (8) slidably connected along its axial direction, the guide ring (8) being conical, and the small diameter end of the guide ring (8) being located between the large diameter end and the third ring segment (73), the small diameter end of the guide ring (8) being adapted to the outer diameter of the second ring segment (72), and the diameter of the large diameter end of the guide ring (8) being adapted to the diameter of the first ring segment (71).

7. The retractable conductor according to claim 6, characterized in that: The electrical connection (10) is also provided with a guide column (11) inserted into the first ring segment (71).

8. The retractable conductor according to claim 1, characterized in that: Two inner conductors (2) are provided, and the two inner conductors (2) are symmetrically arranged.

9. Use of the retractable conductor according to claim 1 in GIS equipment.

10. A method for using the retractable conductor according to claim 7, characterized in that: The following steps are involved: In the GIS equipment, after the spacer busbar barrels (12) are butt-jointed, the conductor is placed in the busbar barrel (12), and one or two inner conductors (2) are arranged in the outer conductor (1) as required, that is, one end or both ends of the outer conductor (1) are telescopically telescopic. If one inner conductor (2) is selected, the other end of the outer conductor (1) uses a conventional fixed joint, and one or two inner conductors (2) are selected as required; Then, the shielding cover is put on the inner conductor, and the limit joint is threadedly connected to the inner conductor, the inner conductor (2) is connected to the outer conductor (1), the guide rod (5) and the spring contact finger (3) are inserted into the outer conductor (1), the guide rod (5) passes through the step (4), and the protrusion is limited by the step (4) and cannot pass through the step (4), and then the shielding cover is threadedly connected to the outer conductor, thereby limiting the inner conductor and also playing a shielding role; Then, the busbar barrel (12) is docked, and a person drills into the busbar barrel (12) or installs the outer conductor (1) from the opening of the busbar barrel (12). If there is a conventional fixed joint, the conventional joint is installed first, and then the limit joint (7) is pushed to move into the outer conductor (1). Due to the limiting effect of the step (4), the inner conductor (2) will not completely enter the outer conductor (1), and at the same time, the inner conductor overcomes the friction of the shielding cover and slides relative to the shielding cover; When the first ring segment (71) and the contact seat are coaxially arranged, the limit connector (7) is driven to be inserted into the contact seat. At this time, the inner conductor overcomes the resistance brought by the shielding cover, so that the first ring segment (71) and the contact ring (9) are pressed into the electrical connection (10), and the inner side surface of the contact ring (9) is pressed against the second ring segment (72), and one end surface of the contact ring (9) is in contact with and connected to the stepped surface formed between the first ring segment (71) and the second ring segment (72). At this time, the decoupling ring (8) is located outside the contact ring (9), thereby achieving connection of the conductors. Compared with the conventional method in which a plurality of busbar barrels (12) are connected together with the internal conductors, and thus the coaxiality of the busbar barrels (12) and the coaxiality of the internal conductors need to be ensured at the same time, by providing the inner conductor (2) and the outer conductor (1), the internal conductor can be installed after the busbar barrel (12) is installed, thereby facilitating the installation operation; When it is necessary to remove the limit connector (7) from the electrical connection (10), the limit connector (7) is driven to continue to move into the electrical connection (10), and the withdrawal ring (8) is moved into the electrical connection (10) under the guidance of the guide surface, that is, at this time, the withdrawal ring and the first ring segment are located on the same side, and then the inner conductor (2) is driven to move into the outer conductor (1), that is, the first ring segment (71) moves toward the contact ring (9), and the contact ring (9) pushes the withdrawal ring (8) to the end surface of the first ring segment (71). Under the guidance of the circumferential surface of the withdrawal ring (8), the opening of the contact ring is enlarged, and the contact ring (9) is brought into contact with the circumferential surface of the first ring segment (71), so that the first ring segment (71) is separated from the electrical connection (10).

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