A butt joint busbar structure for GIS

Abstract

The utility model belongs to circuit breaker production technology technical field, including main bus cylinder and three -phase straight cylinder, and through telescopic joint connection between main bus cylinder and three -phase straight cylinder, its characterized in that, first electric pole is fixed in main bus cylinder through conductor, and second electric pole is fixed in three -phase straight cylinder through bolt, first electric pole and second electric pole are connected through intermediate conductor dismounting, one end of intermediate conductor is fixed and installed in first electric pole end through bolt, and the other end of intermediate conductor is fixed and installed in second electric pole end through bolt, can realize " local overhaul " mode, and need not overall equipment power failure.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker manufacturing technology, and in particular relates to a docking busbar structure for GIS. Background Technology

[0002] The statements in this section are merely background information relating to this disclosure and do not necessarily constitute prior art.

[0003] GIS (Gas Insulated Metal Enclosed Switchgear) is one of the most important pieces of equipment in the power transmission process of substations, and its safety and reliability are fundamental conditions for the stable power transmission of substations. In GIS projects, thermal expansion and contraction of GIS busbars can cause bending and expansion of the GIS busbars and leakage of internal insulating gas, which can lead to unreliable operation of the substation and ultimately safety accidents. To avoid this, busbar expansion joints are currently commonly used to connect adjacent busbar cylinders to compensate for the deformation of the GIS busbars caused by thermal expansion and contraction.

[0004] However, traditional GIS busbar conductors are typically connected by fixed welding or bolts, which presents the following problems: Traditional GIS busbars are difficult to maintain. They are mostly fixed structures with the conductive rods integrated into the busbar cylinder. They need to be completely disassembled for maintenance or replacement, resulting in a large power outage area and high maintenance costs. Utility Model Content

[0005] To address the aforementioned problems, this utility model proposes a docking busbar structure for GIS. The technical problem this utility model aims to solve is...

[0006] According to some embodiments, the present invention adopts the following technical solution: A GIS-compatible busbar structure includes a main busbar drum and a three-phase straight drum, which are connected by an expansion joint. The main busbar drum contains a first conductive rod fixedly mounted via a conductor, and the three-phase straight drum contains a second conductive rod fixedly mounted via bolts. The first and second conductive rods are detachably connected via an intermediate conductor. One end of the intermediate conductor is fixedly mounted to the end of the first conductive rod via bolts, and the other end of the intermediate conductor is fixedly mounted to the end of the second conductive rod via bolts.

[0007] A further feature is provided whereby a maintenance flange is provided on the side wall of the three-phase straight cylinder and corresponding to the intermediate conductor. The flange provides operators with a dedicated maintenance window and operating space.

[0008] A further provision is made that the intermediate conductor has an opening facing the inspection flange and the inspection port, so that maintenance personnel can directly observe the compression state and health of the intermediate conductor through the flange opening.

[0009] A further configuration is that the width of the intermediate conductor is greater than the diameter of the conductive rod. The larger intermediate conductor provides a more uniform distribution of bolt preload, enhancing the mechanical stability and reliability of the connection.

[0010] Further configured, the main busbar is connected to the expansion joint via a first receiving plate, and the three-phase straight tube is connected to the expansion joint via a second receiving plate.

[0011] A further configuration includes a push rod extending through the first receiving plate, with the end of the push rod fixedly connected to the second receiving plate, and a pneumatic cylinder installed at the end of the push rod near the first receiving plate.

[0012] Further configured, the pneumatic cylinders and push rods are arranged in several groups along the circumferential direction of the three-phase straight cylinder sidewall, and the multiple groups of pneumatic cylinders and push rods are evenly distributed along the circumference, which can generate a balanced thrust.

[0013] Further configured, the expansion joint is made of a corrugated hose, which has good axial, lateral and angular compensation capabilities.

[0014] A further configuration is that the central axis of the conductor is perpendicular to the axis of the main busbar diagram. The vertically arranged conductor, usually combined with a basin-type insulator, helps to improve the electric field distribution inside the GIS cylinder.

[0015] Further configured, the first conductive rod is provided in multiple sets along the length of the main busbar drum, and the second conductive rod is provided in multiple sets along the length of the three-phase straight drum. The docking structure is an expandable modular system, with multiple sets of conductive rods on the main busbar drum, which can be sequentially connected to multiple spaced three-phase straight drums.

[0016] The beneficial effects of this utility model are as follows: An intermediate conductor is set along the direction of the conductive rod. The intermediate conductor is removed and the conductive rod is installed. The conductive rod is composed of bolts and spring washers. After the intermediate conductor is removed, the main busbar can be moved laterally through the expansion joint. This enables a "partial maintenance" mode without shutting down the entire equipment, reducing power outage losses by about 80%. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure label: 1. Main busbar; 2. Three-phase straight tube; 3. Expansion joint; 4. Conductor; 5. First conductive rod; 6. Bolt; 7. Second conductive rod; 8. Intermediate conductor; 91. Opening; 10. Inspection flange; 11. First receiving plate; 12. Second receiving plate; 13. Push rod; 14. Pneumatic cylinder. Detailed implementation method: The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0020] Example 1 Reference Figure 1 A GIS-compatible busbar structure includes a main busbar cylinder 1 and a three-phase straight cylinder 2, which are connected by an expansion joint 3. The main busbar cylinder 1 has a first conductive rod 5 fixedly installed inside it via a conductor 4, and a second conductive rod 7 is fixed inside the three-phase straight cylinder 2 via bolts 6. The first conductive rod 5 and the second conductive rod 7 are detachably connected via an intermediate conductor 8. The intermediate conductor 8 includes a middle conductor 8, one end of which is fixedly installed at the end of the first conductive rod 5 via bolts 6, and the other end of which is fixedly installed at the end of the second conductive rod 7 via bolts 6.

[0021] A maintenance flange 10 is provided on the side wall of the three-phase straight tube 2, corresponding to the intermediate conductor 8. This flange provides operators with a dedicated maintenance window and operating space. During partial maintenance, it is not necessary to damage the main structure of the main busbar tube 1 or the three-phase straight tube 2. Simply open the flange cover, and operators can directly access the connection part of the intermediate conductor 8 through this opening to tighten or loosen the bolts 6, check the contact condition, etc., making maintenance work more convenient, efficient, and safe. It eliminates the need for large hoisting equipment for overall disassembly and assembly, reducing the difficulty, manpower, and time costs of maintenance operations.

[0022] The intermediate conductor 8 is provided with an opening 91, which faces the maintenance flange 10. Optimized directional deformation and stress release: Orienting the opening 91 of the intermediate conductor 8 towards the maintenance flange 10 is a carefully designed feature. This ensures that when the intermediate conductor 8 is compressed, its deformation primarily occurs in the direction of the opening 91 (i.e., towards the maintenance port). This directional deformation characteristic can more effectively absorb and release displacement and stress from this direction, while avoiding unnecessary compression of other components inside the cylinder (such as insulators). The opening 91 facing the maintenance port allows maintenance personnel to directly observe the compression state and health of the intermediate conductor 8 through the flange opening, determining whether permanent deformation or aging has occurred, thereby enabling condition-based maintenance and early fault diagnosis.

[0023] The width of the intermediate conductor 8 is greater than the diameter of the conductive rod. The larger intermediate conductor 8 provides a more uniform distribution of the bolt preload 6, enhancing the mechanical stability and reliability of the connection. This prevents loosening during long-term operation or under short-circuit electrodynamic forces, ensuring a durable and stable conductive connection. The wider intermediate conductor 8 also means a significantly increased contact area with the end of the conductive rod. According to electrical principles, this increased contact area effectively reduces the transition resistance at the contact point, thereby reducing heat generation during energization, improving conductivity, and preventing malfunctions caused by localized overheating.

[0024] The main busbar 1 is connected to the expansion joint 3 via the first receiving plate 11, and the three-phase straight tube 2 is connected to the expansion joint 3 via the second receiving plate 12. The arrangement of the first receiving plate 11 and the second receiving plate 12 constitutes a standardized connection interface. This makes the main busbar 1, expansion joint 3, and three-phase straight tube 2 relatively independent modules, facilitating their standardized production, inventory, and replacement.

[0025] A push rod 13 is installed through the first receiving plate 11, and the end of the push rod 13 is fixedly connected to the second receiving plate 12. A pneumatic cylinder 14 is installed at the end of the push rod 13 near the first receiving plate 11. This structure introduces an active adjustment mechanism. By driving the push rod 13 through the pneumatic cylinder 14, a precise thrust or pull force can be applied to the expansion joint 3, thereby actively compensating for the expansion and contraction of the busbar cylinder caused by temperature changes, rather than simply relying on the passive deformation of the expansion joint 3.

[0026] Several sets of pneumatic cylinders 14 and push rods 13 are arranged along the circumference of the side wall of the three-phase straight cylinder 2. The multiple sets of pneumatic cylinders 14 and push rods 13 are evenly distributed along the circumference, which can generate a balanced thrust and avoid the expansion joint 3 or the receiving plate from tilting due to single-point force. This design enables the system to not only compensate for axial expansion and contraction, but also to compensate for small radial deviations or bending to a certain extent, making it more adaptable and ensuring that stable and reliable displacement compensation can be achieved under various complex thermodynamic conditions.

[0027] Expansion joint 3 uses a corrugated hose, which has good axial, lateral and angular compensation capabilities and can absorb displacement and vibration in multiple directions. As part of the busbar cylinder, the corrugated hose itself is a continuous and complete metal seal that can effectively prevent SF6 insulating gas leakage, ensure the sealing integrity of the GIS gas chamber and guarantee insulation strength.

[0028] The central axis of conductor 4 is perpendicular to the central axis of the main busbar drum 1. The vertically arranged conductor 4, usually combined with a basin-type insulator, helps to improve the electric field distribution inside the GIS drum and reduce the risk of partial discharge. This arrangement provides a more regular and sufficient space layout inside the drum, indirectly facilitating the installation and maintenance of the intermediate conductor 8. Multiple sets of first conductive rods 5 are arranged along the length of the main busbar drum 1, and multiple sets of second conductive rods 7 are arranged along the length of the three-phase straight drum 2. The docking structure is an expandable modular system. Multiple sets of conductive rods on the main busbar drum 1 can be sequentially connected to multiple intervals of three-phase straight drums 2.

[0029] Operation process: (1) Equipment power off and safety confirmation stage: Perform equipment power off operation and use a double confirmation mechanism to verify the power off status. Use a special discharge device to perform forced discharge to ensure that the equipment is completely discharged. Confirm the residual voltage ≤36V through a voltage detector.

[0030] (2) Connect the SF6 gas recovery device during the SF6 gas treatment stage, start the vacuum pump to perform two-stage vacuuming, check the gas recovery completion rate, and ensure that the recovery rate is ≥99.9%.

[0031] (3) During the operation of the expansion joint 3, release the mechanical locking device of the expansion joint 3, start the hydraulic control system or manual adjustment mechanism to drive, accurately control the contraction stroke of the expansion joint 3 (10±0.5mm), and monitor the displacement and force during the contraction process in real time.

[0032] (4) During the conductor disassembly stage, remove the maintenance flange 10 connected to the bottom of the main busbar, use special tools to remove the connecting bolts 6 of the intermediate conductor 8, and drive the main busbar drum 1 by manipulating the pneumatic cylinder 14 to slowly move out the intermediate conductor 8 (speed ≤ 5cm / min).

[0033] (5) During the busbar drum processing stage, check the conductor fixing status, then operate the pneumatic cylinder 14 to drive the main busbar drum 1. The conductive rod inside the busbar drum is slowly moved out and placed inside the busbar drum. Install the special lifting clamp and move the busbar drum out smoothly (acceleration ≤ 0.1g).

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0035] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A GIS-compatible busbar structure, comprising a main busbar cylinder and a three-phase straight cylinder, wherein the main busbar cylinder and the three-phase straight cylinder are connected by an expansion joint, characterized in that, The first conductive rod is fixedly installed inside the main busbar drum by a conductor, and the second conductive rod is fixed inside the three-phase straight drum by bolts. The first and second conductive rods are detachably connected by an intermediate conductor. One end of the intermediate conductor is fixedly installed at the end of the first conductive rod by bolts, and the other end of the intermediate conductor is fixedly installed at the end of the second conductive rod by bolts.

2. The GIS-grade docking busbar structure as described in claim 1, characterized in that, The three-phase straight cylindrical sidewall is equipped with a maintenance flange corresponding to the intermediate conductor.

3. The GIS-grade docking busbar structure as described in claim 1, characterized in that, The intermediate conductor has an opening that faces the maintenance flange.

4. A GIS-grade docking busbar structure as described in claim 1, characterized in that, The width of the intermediate conductor is greater than the diameter of the conductive rod.

5. A GIS-grade docking busbar structure as described in claim 1, characterized in that, The main busbar is connected to the expansion joint via the first receiving plate, and the three-phase straight tube is connected to the expansion joint via the second receiving plate.

6. A GIS-grade docking busbar structure as described in claim 5, characterized in that, A push rod is installed through the first receiving plate, and the end of the push rod is fixedly connected to the second receiving plate. A pneumatic cylinder is installed at the end of the push rod near the first receiving plate.

7. A GIS-grade docking busbar structure as described in claim 6, characterized in that, Several sets of pneumatic cylinders and push rods are arranged along the circumferential direction of the three-phase straight cylinder sidewall.

8. A GIS-grade docking busbar structure as described in claim 1, characterized in that, The expansion joint is made of corrugated hose.

9. A GIS-grade docking busbar structure as described in claim 1, characterized in that, The conductor's central axis is perpendicular to the central axis in the main busbar diagram.

10. A GIS-grade docking busbar structure as described in claim 1, characterized in that, Multiple sets of the first conductive rod are arranged along the length of the main busbar cylinder, and multiple sets of the second conductive rod are arranged along the length of the three-phase straight cylinder.

Images