Large-current intermediate-frequency enclosed bus

Abstract

The invention belongs to the technical field of high-power intermediate-frequency power supply, and particularly relates to a high-current intermediate-frequency enclosed bus. Nine aluminum bars are adopted as conductors in the linear section shell, each aluminum bar is wrapped by a polyester film, every three aluminum bars are stacked to form a group of three-phase three-wire power supply system after being wrapped, joints are reserved at two ends of each group, nine groups of aluminum bars are respectively and uniformly formed into nine paths of three-phase three-wire power supply systems in the transverse direction and the longitudinal direction, and the nine paths of three-phase three-wire power supply systems are fixed by bus fixing clamps; each path of aluminum bar is longitudinally fixed and is fixed with the linear section shell by adopting a stainless steel fixing bolt, the phase sequence definitions of every three paths in the longitudinal direction are the same, and the three paths in the transverse direction are respectively defined as ABC, CAB and BCA; the interior of the T-shaped branch wiring shell is divided into a straight line section and a branch wiring part, and the layout of the straight line section in the T-shaped branch wiring shell is consistent with the design of the straight line section. The problem that medium-frequency cables adopted between medium-frequency power supplies are large in consumption is solved, fault points are reduced, and power supply reliability is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of high-power medium-frequency power supply, and in particular relates to a high-current medium-frequency enclosed busbar. Background Art

[0002] At present, dense enclosed busbars have been widely used in industrial frequency power supply systems and are a very mature technology, but are less used in high-power medium-frequency power supply systems. Dense busbars have the advantages of easy installation, low manufacturing cost, and low impedance, and have broad application prospects. The present invention is suitable for busbar power supply schemes in high-power medium-frequency power supply systems and is applied in actual production operations. It not only saves project investment, but also reduces installation labor intensity, reduces voltage loss due to cables as busbars, and improves power supply reliability. Summary of the invention

[0003] The purpose of the present invention is to provide a large current medium frequency closed busbar to solve the problem of large amount of medium frequency cables used between medium frequency power supplies, reduce fault points and improve power supply reliability.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A large current medium frequency closed busbar, wherein 9 aluminum bars are used as conductors inside a straight section shell, each aluminum bar is wrapped with a polyester film, and every three aluminum bars are wrapped and stacked to form a three-phase three-wire power supply system, with joints left at both ends of each group, and the 9 groups of aluminum bars are evenly formed into 9 three-phase three-wire power supply systems horizontally and vertically, and fixed with busbar fixing clamps, and each aluminum bar is fixed vertically and fixed with the straight section shell with stainless steel fixing bolts, the phase sequence of each three lines in the vertical direction is the same, and the three lines in the horizontal direction are defined as ABC, CAB, and BCA respectively; the interior of a T-type branch wiring shell is divided into two parts: a straight section and a branch wiring, and the layout of the straight section inside the T-type branch wiring shell is consistent with the above-mentioned straight section design, and the branch wiring short-circuits each aluminum bar with the same phase sequence in the longitudinal direction of the straight section and welds it, and then leads it downward, and a total of 3 busbars with the same phase sequence are led out after the longitudinal short-circuiting, and the lead-out parallel part is completed inside the T-type branch wiring shell, and the 3 busbars with the same phase sequence are connected in parallel to the same contact point outside for equipment connection.

[0006] The straight section shell is made of 2mm thick six series alloy aluminum.

[0007] A 1.8m long 3mm×40mm aluminum bar is used as the conductor.

[0008] There are 80mm long joints at both ends of each group.

[0009] The distance between the joints is 15 mm.

[0010] The stainless steel fixing bolt adopts M12×280mm half-thread screw. The threaded part is located at the end of the screw. The length of the screw does not exceed 50mm. The middle unthreaded part is insulated with 1mm thick insulating glass fiber casing.

[0011] The lead-out part adopts 3mm×60mm aluminum bar.

[0012] Medium frequency enclosed busbar connectors are used to connect straight line segments to straight line segments, and straight line segments to T-type branch wiring.

[0013] The connecting parts use 9 pieces of conductive aluminum plates with length × width × thickness = 300mm × 250mm × 3mm and 10 pieces of unsaturated polyester resin insulating partitions with length × width × thickness = 330mm × 280mm × 12mm as the basic internal structure, and the outer shell is fixed with two pieces of C-shaped stainless steel plates with length × width × thickness = 340mm × 290mm × 3mm and six M12 × 280mm stainless steel screws.

[0014] The straight sections are mounted on support brackets welded to the wall.

[0015] The beneficial effects achieved by the present invention are:

[0016] The straight section of the medium-frequency enclosed busbar meets the requirements of different medium-frequency power supply modes and medium-frequency power supply below 1200A, ensuring the balance of the line magnetic field and current, reducing the noise interference of the medium-frequency power grid, and effectively reducing the medium-frequency voltage loss of the line. It has strong adaptability and good heat dissipation effect; the parallel connection and phase-changing structure of the medium-frequency busbar branch joints meet the requirements of medium-frequency large-current power supply, effectively improving the reliability of medium-frequency power supply; the busbar is made of six-series aluminum alloy as a whole, which not only ensures the busbar's seismic resistance and reliable fixation, but also reduces production costs, reduces the weight of the busbar, and especially reduces the heating caused by the eddy current effect of the medium-frequency large current environment.

[0017] Small voltage drop and low impedance. The voltage drop and impedance tests were conducted on the IF cable and the IF enclosed busbar, as shown in Table 1. According to the test results, it can be concluded that the voltage drop and impedance of the IF dense busbar are much smaller than those of the IF cable.

[0018]

[0019] Table 1: Voltage drop and impedance test table of medium frequency cable and medium frequency enclosed bus

[0020] The loop impedance is small.

[0021]

[0022] Table 2: Medium frequency intensive bus circuit resistance value test table

[0023] Small temperature rise.

[0024]

[0025] Table 3: Medium frequency intensive busbar temperature rise test record BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A is a high current medium frequency closed busbar structure diagram;

[0027] Figure 2 This is a high current medium frequency closed busbar structure diagram B;

[0028] In the figure: 1. Busbar fixing clamp; 2. Fixing bolts; 3. Aluminum alloy metal casing; 4. Aluminum busbar; 5. Insulating material; 6. T-joint aluminum busbar. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] A high-current low-voltage medium-frequency enclosed busbar for a uranium enrichment medium-frequency power supply system is designed with a straight section, a T-type branch connection, and a connector. The straight section shell is made of 2mm thick six-series alloy aluminum, and the internal conductor is made of 9 1.8m long 3mm×40mm metal aluminum bars as conductors. Each aluminum bar is wrapped with a polyester film for electrical insulation. After each three aluminum bars are wrapped, they are stacked to form a three-phase three-wire power supply system. 80mm long joints are left at both ends of each group, and the phase spacing between the joints is 15mm. Then the 9 groups of aluminum bars are evenly formed into 9 three-phase three-wire power supply systems horizontally and vertically. The combined 9 three-phase three-wire power supply lines are fixed with busbar clamps, and each aluminum bar is fixed vertically, and fixed to the shell with stainless steel bolts. The stainless steel bolts use M12×280mm half-thread screws, the threaded part is located at the end of the screw, the length of the screw does not exceed 50mm, and the unthreaded part in the middle is insulated with a 1mm thick insulating glass fiber casing. The phase sequence of each three-way vertical path is defined the same, and the three-way horizontal path is defined as ABC, CAB, and BCA respectively.

[0031] The design material of the T-type branch wiring shell is consistent with that of the straight section. The interior is divided into two parts: the straight section and the branch wiring. The layout of the straight section is consistent with the aforementioned straight section design. The branch wiring short-circuits and welds each aluminum busbar with the same phase sequence in the longitudinal direction of the straight section and then leads it downward. The lead-out aluminum busbar adopts 3mm×60mm aluminum busbar for lead-out. After longitudinal short-circuiting, a total of 3 busbars with the same phase sequence can be led out. The lead-out parallel part is completed inside the shell, and the 3 busbars with the same phase sequence are connected in parallel to the same contact point outside for equipment connection.

[0032] The medium-frequency enclosed busbar connector is used for connecting straight sections with straight sections, and straight sections with T-type branch wiring. The connector adopts 9 pieces of conductive aluminum plates with length × width × thickness = 300mm × 250mm × 3mm and 10 pieces of unsaturated polyester resin insulating partitions with length × width × thickness = 330mm × 280mm × 12mm as the basic internal structure. The outer shell is fixed with two pieces of C-type stainless steel plates with length × width × thickness = 340mm × 290mm × 3mm and six M12 × 280mm stainless steel screws. The stainless steel bolts use M12 × 280mm half-thread screws. The threaded part is located at the end of the screw. The length of the screw does not exceed 50mm. The unthreaded part in the middle is insulated with a 1mm thick insulating glass fiber casing.

[0033] Aluminum bars 4 are used as the main conductor inside. Aluminum bars 4 are wrapped with insulating materials 5. After wrapping, three bars 1 are bundled in a longitudinal stacking manner and used as a group of three-phase three-wire power supply structure conductors. Each group of conductors is placed longitudinally from the cross section. Three groups are evenly placed transversely and longitudinally. A total of nine groups of three-phase three-wire structure busbars are neatly arranged. The nine groups of busbars are fixed by busbar fixing clamps 1. Each group of busbars in the transverse direction is defined as: ABC, CAB, BCA, so that the phase sequence of each group of busbars in the longitudinal direction is consistent, thus forming a high-current low-voltage medium-frequency enclosed busbar straight section. Each straight section is about 1.8m long (for easy transportation and installation). In order to ensure reliable connection between the straight section and others, joints are reserved on both sides of each group of busbars at both ends of the straight section. The two sides of the busbars at the joints are folded into an angle of 135°, so that the phase spacing is about 15mm, and the reserved connection joint is about 50mm, which is convenient for connection with the medium-frequency enclosed busbar connector.

[0034] The external insulation of the medium frequency busbar is wrapped with insulating material, and the insulation between the connectors is insulated with epoxy resin board. The length of the straight section of the medium frequency busbar: The length of the straight section is 2 meters. The interior of the medium frequency busbar consists of 9 groups of aluminum bars, each with 3 aluminum bars. Each group of aluminum bars is arranged from left to right in ABC, CAB, and BCA, and is collected in the T-type connector for output after phase switching. The structure of the T-type connector is as follows: the overall dimensions are: 350mm*330mm, and the total length is 630mm. The T-type connector is connected to the straight section through an intermediate connector, and the intermediate connector is fastened by a through bolt. Connection between the medium frequency busbar and the power inlet and outlet of the medium frequency power supply cabinet: The medium frequency dense busbar is connected to the power inlet and outlet of the medium frequency power supply cabinet through a T-type connector. The temperature during operation is monitored by thermal infrared temperature measurement. The straight section of the medium frequency busbar can be installed on the support bracket welded on the wall. When the medium frequency busbar is installed on the top of the medium frequency power supply cabinet, it is connected to the medium frequency power supply through a T-type connector.

Claims

1. A high current medium frequency enclosed busbar, characterized by: Nine aluminum bars are used as conductors inside the straight section shell, and each aluminum bar is wrapped with polyester film. After every three aluminum bars are wrapped, they are stacked to form a three-phase three-wire power supply system. Joints are left at both ends of each group. The nine groups of aluminum bars are evenly formed into nine three-phase three-wire power supply systems horizontally and vertically, and fixed with busbar fixing clamps. Each aluminum bar is fixed vertically and fixed to the straight section shell with stainless steel fixing bolts. The phase sequence of each three lines in the vertical direction is the same, and the three lines in the horizontal direction are defined as ABC, CAB, and BCA respectively; the interior of the T-type branch wiring shell is divided into two parts: the straight section and the branch wiring. The layout of the straight section inside the T-type branch wiring shell is consistent with the aforementioned straight section design. The branch wiring short-circuits each aluminum bar with the same phase sequence in the vertical direction of the straight section and welds it, and then leads it downward. After the vertical short-circuiting, a total of three busbars with the same phase sequence are led out, and the lead-out parallel part is completed inside the T-type branch wiring shell. The three busbars with the same phase sequence are connected in parallel to the same contact point outside for equipment connection.

2. The high current medium frequency enclosed busbar according to claim 1 is characterized in that: The straight section shell is made of 2mm thick six series alloy aluminum.

3. The high current medium frequency enclosed busbar according to claim 1 is characterized in that: A 1.8m long 3mm×40mm aluminum bar is used as the conductor.

4. The high current medium frequency enclosed busbar according to claim 1, characterized in that: There are 80mm long joints at both ends of each group.

5. The high current medium frequency enclosed busbar according to claim 1, characterized in that: The distance between the joints is 15 mm.

6. The high current medium frequency enclosed busbar according to claim 1, characterized in that: The stainless steel fixing bolt adopts M12×280mm half-thread screw. The threaded part is located at the end of the screw. The length of the screw does not exceed 50mm. The middle unthreaded part is insulated with 1mm thick insulating glass fiber casing.

7. The high current medium frequency enclosed busbar according to claim 1, characterized in that: The lead-out part adopts 3mm×60mm aluminum bar.

8. The high current medium frequency enclosed busbar according to claim 1, characterized in that: Medium frequency enclosed busbar connectors are used to connect straight line segments to straight line segments, and straight line segments to T-type branch wiring.

9. The high current medium frequency enclosed busbar according to claim 8, characterized in that: The connecting parts are 9 pieces of conductive aluminum plates with a length × width × thickness = 300mm × 250mm × 3mm and 10 pieces of length × width × thickness =330mm×280mm×12mm unsaturated polyester resin insulating partition is the basic internal structure, and the outer shell is fixed with two length×width×thickness=340mm×290mm×3mm C-shaped stainless steel plates and six M12×280mm stainless steel screws.

10. The high current medium frequency enclosed busbar according to claim 1, characterized in that: The straight sections are mounted on support brackets welded to the wall.

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