An integral plug-in cabinet splicer for 66 kV switches

Abstract

The present invention discloses an integral plug-in cabinet splicer for a 66 kV switch, which includes a conductor busbar, an inserted F-type bushing, and a pressing device. The conductor busbar is wrapped with a grading conductive layer, and outside the grading conductive layer there is an insulating layer, and the insulating layer is wrapped with an outer shielding layer; the inserted F-type bushing includes a base part and a frustum part, and the inserted F-type bushing is provided with a connecting busbar passing through the base part and the frustum part, and an insertion port is arranged at the upper end of the connecting busbar; both ends of the insulating layer have socket interfaces adapted to the frustum part, both ends of the conductor busbar extend into the socket interfaces, the socket interfaces are sleeved on the frustum part, and the end of the conductor busbar is inserted into the insertion port of the connecting busbar; the pressing device is used to press the insulating layer and the frustum part; the conductor busbar, the grading conductive layer, the insulating layer, and the outer shielding layer of the present invention are of an integral structure, reducing the insulation mating interface, there is no problem that silicone grease easily enters the surface of the conductor, reducing the influence of the position error of the ring main unit, and improving the operation reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of busbars, and particularly relates to a 66 kV switch integral plug-in cabinet splicing device. Background Art

[0002] At present, split-type structure busbars are adopted for the parallel connection of 66 kV switches both at home and abroad. However, the split-type busbars have problems such as multiple insulation coordination interfaces, difficult exhaust, and easy entry of silicone grease into the conductor surface. At the same time, they are also affected by the positional error of the ring main unit, which causes certain damage to the normal operation of offshore wind power. Due to the limitation of traffic conditions for offshore wind power, maintenance or repair is very inconvenient. Therefore, there is an urgent need for a cabinet splicing product with fewer insulation coordination interfaces and capable of rapid installation. Summary of the Invention

[0003] The purpose of the invention is to provide a 66 kV switch integral plug-in cabinet splicing device, aiming to improve the problems of multiple insulation coordination interfaces, difficult exhaust, and easy entry of silicone grease into the conductor surface caused by the adoption of split-type structure busbars during the parallel connection of existing 66 kV switches.

[0004] To achieve the above purpose, the invention provides a 66 kV switch integral plug-in cabinet splicing device, which includes a conductor busbar, an inserted F-type bushing, and a pressing device. The conductor busbar is wrapped with a grading conductive layer, the outside of the grading conductive layer includes an insulating layer, and the outside of the insulating layer is wrapped with an outer shielding layer; the inserted F-type bushing includes a base part and a frustum part, the inserted F-type bushing is provided with a connecting busbar penetrating through the base part and the frustum part, and an insertion interface is arranged at the upper end of the connecting busbar; both ends of the insulating layer have socket interfaces adapted to the frustum part, both ends of the conductor busbar extend into the socket interfaces, the socket interfaces are sleeved on the frustum part, and the end of the conductor busbar is inserted into the insertion interface of the connecting busbar; the pressing device is used to press the insulating layer and the frustum part.

[0005] Further, the conductor busbar includes a straight section, and a vertical plug-in connection section is arranged at each end of the straight section. An arc transition section is arranged between the straight section and the vertical plug-in connection section, and the straight section and the arc transition section are both wrapped with a grading conductive layer; when the socket interface of the insulating layer is sleeved on the frustum part of the inserted F-type bushing, the vertical plug-in connection section of the conductor busbar is inserted into the insertion interface of the connecting busbar.

[0006] Further, an insulating elastic rubber structure is arranged at the upper end of the socket interface, and the vertical plug-in connection section of the conductor busbar passes through the insulating elastic rubber structure.

[0007] Furthermore, the pressing device includes a base, a screw, a receiving nut, a pressing nut, and a pressing plate. The base has an installation groove for the installation base portion. On both sides of the installation groove on the base, one or more first threaded holes are provided, and a screw is installed in each first threaded hole. Through holes for each screw to pass through are provided at both ends of the pressing plate. A receiving nut and a pressing nut are installed on each screw. The receiving nut is located below the pressing plate and is used to support the pressing plate. The pressing nut is located above the pressing plate and is used to press the pressing plate. The pressing plate presses the insulating layer and the frustum portion under the action of the pressing nut.

[0008] Furthermore, the pressing device further includes a crimping plate and a pressing bolt. On both sides of the installation groove on the base, one or more second threaded holes are provided, and a pressing bolt is installed in each second threaded hole. A through hole for the rod portion of the pressing bolt to pass through is provided on the crimping plate. One end of the crimping plate is crimped on the base portion of the plug-in F-type bushing under the action of the pressing bolt.

[0009] Furthermore, the pressing plate is made of a hard material. The pressing plate includes an arc-shaped plate portion and a flat plate portion. A flat plate portion is provided at each end of the arc-shaped plate portion. Through holes for each screw to pass through are provided on the flat plate portion. The inner arc surface of the arc-shaped plate portion presses the end of the insulating layer. The upper end of the end of the tight insulating layer has an arc-shaped contact portion adapted to the inner arc surface of the arc-shaped plate portion.

[0010] Furthermore, the pressing device additionally includes a pressing spring. The pressing spring is sleeved on the screw, and the pressing spring is located between the pressing plate and the pressing nut.

[0011] Furthermore, a circular first spring placement hole is provided on the pressing plate. The lower end of the pressing spring is arranged in the first spring placement hole. A pressure block is also sleeved on the screw. The pressure block is located between the pressing spring and the pressing nut. A second spring placement hole is provided on the lower end surface of the pressure block. The upper end of the pressing spring is located in the second spring placement hole.

[0012] Furthermore, the elastic coefficient of the pressing spring is K, the minimum pressing force required to press the insulating layer and the frustum portion is Fmin, the maximum pressing force that the insulating layer and the frustum portion can withstand is Fmax, and the pitch of the screw is P. Then, when tightening the pressing nut, the number of turns N of rotation satisfies the following formula: Fmin < M × K × P × N < a × Fmax. In this formula, M is the number of pressing springs, and a is the coefficient of influence of thermal expansion, with a maximum value of 1, which is determined by the maximum operating temperature.

[0013] Furthermore, the pressure plate is made of rubber material, and hard plates made of hard materials are provided inside both ends of the pressure plate. Through holes for each screw to pass through are provided at both ends of the pressure plate, and the through holes penetrate the hard plates.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The conductor busbar, the voltage equalizing conductive layer, the insulating layer and the outer shielding layer of the present invention are of an integral structure, reducing the insulation coordination interface, eliminating the problem that silicone grease easily enters the surface of the conductor, reducing the influence of the position error of the ring main unit, and improving the operation reliability.

[0016] 2. The pressure plate of the present invention can be made of hard material, and the pressure plate includes an arc-shaped plate portion and a flat plate portion. The inner arc surface of the arc-shaped plate portion presses the end of the insulating layer, and an arc-shaped contact portion adapted to the inner arc surface of the arc-shaped plate portion is provided at the upper end of the end of the insulating layer. In this way, fitting compression can be achieved, increasing the force-bearing area, making the compression more uniform and not easily damaged by pressing.

[0017] 3. The pressure plate of the present invention can also be made of rubber material, and hard plates made of hard materials are provided inside both ends of the pressure plate. By providing the hard plates, the pressure plate is convenient to support. The portion of the pressure plate between the two hard plates is a soft fitting portion, which can fit with the upper end of the end of the insulating layer when pressing the insulating layer, increasing the force-bearing area and making the compression more uniform.

[0018] 4. The pressing device of the present invention is also provided with a pressing spring. When installing the pressing nut for applying the pressing force, considering the minimum pressing force Fmin, the maximum pressing force Fmax and the influence of thermal expansion, the pressing nut and the pressing spring can provide a suitable pressing force, which can not only ensure sufficient pressure but also not press too tightly to cause structural damage, and at the same time take into account the influence caused by thermal expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the first structural schematic diagram of the 66kV switch integral plug-in and splicing cabinet device of the present invention;

[0020] Figure 2 is the second structural schematic diagram of the 66kV switch integral plug-in and splicing cabinet device of the present invention;

[0021] Figure 3 is the cross-sectional view of the conductor busbar, the voltage equalizing conductive layer, the insulating layer and the outer shielding layer of the 66kV switch integral plug-in and splicing cabinet device of the present invention;

[0022] Figure 4 is Figure 3 the cross-sectional view at the vertical plug-in connection section of the structure shown;

[0023] Figure 5 It is a cross-sectional view of the conductor busbar and the voltage-sharing conductive layer of the 66kV switch integral plug-in cabinet assembly device of the present invention;

[0024] Figure 6 It is a structural schematic diagram of the plug-in F-type bushing of the 66kV switch integral plug-in cabinet assembly device described in the present invention;

[0025] Figure 7 It is a cross-sectional schematic diagram of a pressure plate of the 66kV switch integral plug-in cabinet assembly device described in the present invention.

[0026] In the figure: 1. conductor busbar; 101. straight section; 102. arc transition section; 103. vertical plug-in connection section; 2. voltage-equalizing conductive layer; 3. insulating layer; 301. socket; 4. outer shielding layer; 5. plug-in F-type sleeve; 501. base; 502. truncated cone; 503. connecting busbar; 504. plug-in interface; 6. pressure block; 7. insulating elastic rubber structure; 8. base; 9. screw; 10. socket nut; 11. clamping nut; 12. pressure plate; 13. crimping plate; 14. hard plate; 15. clamping spring. DETAILED DESCRIPTION

[0027] The following is a further description with reference to the accompanying drawings and specific embodiments:

[0028] like Figure 1 , Figure 3 and Figure 5 As shown, a 66kV switch integral plug-in cabinet assembly includes a conductor busbar 1, an insertable F-type bushing 5 and a clamping device. The conductor busbar 1 includes a straight section 101, an arc transition section 102 and a vertical plug-in connection section 103. A vertical plug-in connection section 103 is provided at each end of the straight section 101, and the straight section 101 and the vertical plug-in connection section 103 are connected through the arc transition section 102. The straight section 101 and the arc transition section 102 are both wrapped with a voltage-equalizing conductive layer 2. The voltage-equalizing conductive layer 2 includes an insulating layer 3, and the insulating layer 3 is wrapped with an outer shielding layer 4. In this way, the conductor busbar 1, the voltage-equalizing conductive layer 2, the insulating layer 3 and the outer shielding layer 4 are an integrated structure, which reduces the insulation matching interface, does not have the problem of silicone grease easily entering the conductor surface, reduces the influence of the position error of the ring network cabinet, and improves the reliability of operation. In order to facilitate production, the outer shielding layer 4 can be formed separately, but it must maintain an integral structure with the insulating layer.

[0029] like Figure 1 , Figure 3 , Figure 4 and Figure 6As shown in the figure, the plug-in F-type bushing 5 includes a base portion 501 and a frustum portion 502. The plug-in F-type bushing 5 is provided with a connecting busbar 503 passing through the base portion 501 and the frustum portion 502, and an insertion interface 504 is provided at the upper end of the connecting busbar 503. Both ends of the insulating layer 3 have socket interfaces 301 adapted to the frustum portion 502, and an insulating elastic rubber structure 7 is provided at the upper end of the socket interface 301. The vertical insertion connection section 103 of the conductor busbar 1 passes through the insulating elastic rubber structure 7 and is inserted into the socket interface 301 of the insulating layer 3. When the socket interface 301 of the insulating layer 3 is sleeved on the frustum portion 502 of the plug-in F-type bushing 5, the vertical insertion connection section 103 of the conductor busbar 1 is inserted into the insertion interface 504 of the connecting busbar 503.

[0030] As Figure 1 shown, the pressing device includes a base 8, a screw 9, a receiving nut 10, a pressing nut 11, a pressing plate 12, a crimping plate 13 and a pressing bolt. The base 8 has a mounting groove for mounting the base portion 501. One or more second threaded holes are provided on both sides of the mounting groove on the base 8, and a pressing bolt is installed in each second threaded hole. The crimping plate 13 is provided with a through hole for the rod portion of the pressing bolt to pass through. One end of the crimping plate 13 is pressed against the base portion 501 of the plug-in F-type bushing 5 under the action of the pressing bolt, thus realizing the fixation of the plug-in F-type bushing 5. One or more first threaded holes are provided on both sides of the mounting groove on the base 8, and a screw 9 is installed in each first threaded hole. Through holes for each screw 9 to pass through are provided at both ends of the pressing plate 12. A receiving nut 10 and a pressing nut 11 are installed on each screw 9, and the receiving nut 10 is located on the lower side of the pressing plate 12 for supporting the pressing plate 12, and the pressing nut 11 is located on the upper side of the pressing plate 12 for pressing the pressing plate 12. The pressing plate 12 presses the insulating layer 3 and the frustum portion 502 under the action of the pressing nut 11.

[0031] In some exemplary embodiments, as Figure 1 shown, the pressing plate 12 is made of a hard material such as steel, aluminum alloy, hard plastic, acrylic plate, etc. The pressing plate 12 includes an arc-shaped plate portion and a flat plate portion. A flat plate portion is provided at each end of the arc-shaped plate portion, and a through hole for each screw 9 to pass through is provided on the flat plate portion. The inner arc surface of the arc-shaped plate portion presses the end of the insulating layer 3, and an arc-shaped contact portion adapted to the inner arc surface of the arc-shaped plate portion is provided at the upper end of the end of the insulating layer 3, so that fitting pressing can be realized, the stress area is increased, and the pressing can be made more uniform and not easily damaged.

[0032] In some exemplary embodiments, as Figure 2As shown in the figure, the pressing device includes a base 8, a screw 9, a receiving nut 10, a pressing nut 11, a pressing plate 12, a crimping plate 13, a pressing bolt, a pressing spring 15, and a pressing block 6. The base 8 has an installation groove for installing the mounting base portion 501. One or more second threaded holes are provided on both sides of the installation groove on the base 8, and a pressing bolt is installed in each second threaded hole. The crimping plate 13 is provided with a through hole for the rod portion of the pressing bolt to pass through. One end of the crimping plate 13 is pressed against the base portion 501 of the plug-in F-type sleeve 5 under the action of the pressing bolt, thus realizing the fixation of the plug-in F-type sleeve 5. One or more first threaded holes are provided on both sides of the installation groove on the base 8, and a screw 9 is installed in each first threaded hole. The pressing plate 12 is made of a hard material, such as steel, aluminum alloy, hard plastic, acrylic plate, etc. Through holes for each screw 9 to pass through are provided at both ends of the pressing plate 12. A receiving nut 10 and a pressing nut 11 are installed on each screw 9, and a pressing spring 15 and a pressing block 6 are sleeved thereon. The receiving nut 10 is located on the lower side of the pressing plate 12 and is used to support the pressing plate 12. The pressing nut 11, the pressing spring 15, and the pressing block 6 are all located on the upper side of the pressing plate 12 and are used to press the pressing plate 12. The pressing spring 15 is located between the pressing plate 12 and the pressing block 6, and the pressing block 6 is located between the pressing spring 15 and the pressing nut 11. The pressing plate 12 presses the insulating layer 3 and the frustum portion 502 under the action of the pressing nut 11 and the pressing spring 15.

[0033] As Figure 2 shown in the figure, the pressing plate 12 is provided with an annular first spring placement hole, and the lower end of the pressing spring 15 is arranged in the first spring placement hole. A second spring placement hole is provided on the lower end surface of the pressing block 6, and the upper end of the pressing spring 15 is located in the second spring placement hole, so that the stable arrangement of the pressing spring 15 can be realized. The elastic coefficient of the pressing spring 15 is K, the minimum pressing force required to press the insulating layer 3 and the frustum portion 502 is Fmin, the maximum pressing force that the insulating layer 3 and the frustum portion 502 can withstand is Fmax, and the pitch of the screw 9 is P. Then, when the pressing nut 11 is tightened, the number of turns N of rotation satisfies the following formula: Fmin < M × K × P × N < a × Fmax. In this formula, M is the number of pressing springs 15, usually an even number, and an even number of pressing springs 15 are evenly and symmetrically arranged on both sides of the plug-in F-type sleeve 5. a is the thermal expansion influence coefficient, and the maximum value is 1, which is determined by the maximum working temperature. By conducting experiments at different working temperatures, the thermal expansion influence coefficient a at different working temperatures can be determined, and then it can be selected according to the usage conditions of the present invention. When installing the pressing nut 11 through the above formula, a suitable pressing force can be provided, which can not only ensure sufficient pressure but also prevent over-pressing and causing structural damage, and at the same time take into account the influence caused by thermal expansion.

[0034] In some exemplary embodiments, the pressure plate 12 is made of a rubber material. Hard plates 14 made of a hard material are provided inside both ends of the pressure plate 12. The hard plates 14 can be made of materials such as steel plates, aluminum alloy plates, and acrylic plates. Through holes for each screw 9 to pass through are provided at both ends of the pressure plate 12, and the through holes penetrate the hard plates 14. By providing the hard plates 14, the pressure plate 12 can be easily supported. The portion of the pressure plate 12 between the two hard plates 14 is a soft fitting portion, which can be fitted to the upper end of the end portion of the insulating layer 3 when pressing the insulating layer 3, increasing the force-bearing area and making the pressing more uniform.

[0035] In summary, the conductor busbar 1, the grading conductive layer 2, the insulating layer 3, and the outer shielding layer 4 of the present invention are an integral structure, reducing the insulation mating interface, eliminating the problem that silicone grease easily enters the surface of the conductor, reducing the influence of the position error of the ring main unit, and improving the operation reliability. The pressure plate 12 of the present invention can be made of a hard material, and the pressure plate 12 includes an arc plate portion and a flat plate portion. The inner arc surface of the arc plate portion presses the end portion of the insulating layer 3, and the upper end of the end portion of the insulating layer 3 has an arc contact portion adapted to the inner arc surface of the arc plate portion, so that fitting and pressing can be achieved, increasing the force-bearing area and making the pressing more uniform and not easily crushing. The pressure plate 12 of the present invention can also be made of a rubber material. Hard plates 14 made of a hard material are provided inside both ends of the pressure plate 12. By providing the hard plates 14, the pressure plate 12 can be easily supported. The portion of the pressure plate 12 between the two hard plates 14 is a soft fitting portion, which can be fitted to the upper end of the end portion of the insulating layer 3 when pressing the insulating layer 3, increasing the force-bearing area and making the pressing more uniform. In addition, the pressing device of the present invention is also provided with a pressing spring 15. When installing the pressing nut 11 for applying the pressing force, considering the minimum pressing force Fmin, the maximum pressing force Fmax, and the influence of thermal expansion, the pressing nut 11 and the pressing spring 15 can provide a suitable pressing force, which can not only ensure sufficient pressure but also not press too tightly to cause structural damage, and at the same time take into account the influence caused by thermal expansion.

[0036] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An integral plug-in cabinet splicer for a 66 kV switch, characterized in that: It includes a conductor busbar, a plug-in F-type bushing and a pressing device. The conductor busbar is wrapped with an equipotential conductive layer, and outside the equipotential conductive layer there is an insulating layer, and the insulating layer is wrapped with an outer shielding layer; The plug-in F-type bushing includes a base portion and a frustum portion, and the plug-in F-type bushing is provided with a connecting busbar passing through the base portion and the frustum portion, and an insertion port is arranged at the upper end of the connecting busbar; Both ends of the insulating layer have socket interfaces adapted to the frustum portion, and both ends of the conductor busbar extend into the socket interfaces, the socket interfaces are sleeved on the frustum portion, and the end of the conductor busbar is inserted into the insertion port of the connecting busbar; The pressing device includes a base, a screw rod, a receiving nut, a pressing nut and a pressing plate. The base has an installation groove for installing the base portion; One or more first threaded holes are arranged on both sides of the installation groove on the base, and a screw rod is installed in each first threaded hole; Through holes for each screw rod to pass through are arranged at both ends of the pressing plate, and a receiving nut and a pressing nut are installed on each screw rod. The receiving nut is located on the lower side of the pressing plate for supporting the pressing plate, and the pressing nut is located on the upper side of the pressing plate for pressing the pressing plate. The pressing plate presses the insulating layer and the frustum portion under the action of the pressing nut; One or more second threaded holes are arranged on both sides of the installation groove on the base, and a pressing bolt is installed in each second threaded hole; A through hole for the rod portion of the pressing bolt to pass through is arranged on the pressing plate, and one end of the pressing plate is crimped on the base portion of the plug-in F-type bushing under the action of the pressing bolt; A pressing spring is sleeved on the screw rod, and the pressing spring is located between the pressing plate and the pressing nut; A circular first spring placement hole is arranged on the pressing plate, and the lower end of the pressing spring is arranged in the first spring placement hole; A pressing block is also sleeved on the screw rod, the pressing block is located between the pressing spring and the pressing nut, and a second spring placement hole is arranged on the lower end surface of the pressing block, and the upper end of the pressing spring is located in the second spring placement hole; The elastic coefficient of the pressing spring is K, the minimum pressing force required to press the insulating layer and the frustum portion is Fmin, the maximum pressing force that the insulating layer and the frustum portion can withstand is Fmax, and the pitch of the screw rod is P. Then when tightening the pressing nut, the number of turns N of turning satisfies the following formula: Fmin < M×K×P×N < a×Fmax. In this formula, M is the number of pressing springs, a is the thermal expansion influence coefficient, and the maximum value is 1, which is determined by the maximum operating temperature; When installing the pressing nut for applying the pressing force, considering the minimum pressing force of Fmin, the maximum pressing force of Fmax and the thermal expansion influence at the same time, so that the pressing nut and the pressing spring can provide a suitable pressing force, which can not only ensure sufficient pressure, but also will not be pressed too tightly to cause structural damage, and takes into account the influence caused by thermal expansion.

2. The integral plug-in and assembled cabinet device for 66 kV switch according to claim 1, characterized in that: The conductor busbar includes a straight section, and a vertical plug-in connection section is arranged at each end of the straight section. An arc transition section is arranged between the straight section and the vertical plug-in connection section, and the equipotential conductive layer is wrapped on both the straight section and the arc transition section; When the socket interface of the insulating layer is sleeved on the frustum portion of the plug-in F-type bushing, the vertical plug-in connection section of the conductor busbar is inserted into the insertion port of the connecting busbar.

3. The integral plug-in cabinet splicer for the 66 kV switch according to claim 1, wherein: An insulating elastic rubber structure is provided at the upper end of the socket, and the vertical insertion connection section of the conductor bus passes through the insulating elastic rubber structure.

4. The integral plug-in cabinet splicer for the 66 kV switch according to claim 1, wherein: The pressing plate is made of a hard material. The pressing plate includes an arc-shaped plate portion and a flat plate portion. There is a flat plate portion at each end of the arc-shaped plate portion. Through holes for each screw to pass through are provided on the flat plate portion. The inner arc surface of the arc-shaped plate portion presses the end of the insulating layer, and the upper end of the end of the insulating layer has an arc-shaped contact portion adapted to the inner arc surface of the arc-shaped plate portion.

5. The integral plug-in cabinet splicer for 66 kV switch according to claim 1, wherein: The pressing plate is made of a rubber material. Hard plates made of a hard material are provided inside both ends of the pressing plate. Through holes for each screw to pass through are provided at both ends of the pressing plate, and the through holes penetrate the hard plates.

Images