Thyristor-controlled series capacitor device

Abstract

The invention relates to the technical field of capacitors, in particular to a thyristor control series capacitor device which comprises a containing box, an annular electromagnetic shielding layer is arranged in the containing box, a capacitor is arranged in the annular electromagnetic shielding layer, a heat dissipation cavity is formed between the annular electromagnetic shielding layer and the inner wall of the containing box, and a circular heat dissipation assembly is installed in the heat dissipation cavity. The top of the containing box is fixedly connected with a sealing assembly covering the heat dissipation cavity. The circular heat dissipation assembly comprises a metal circular plate, an elastic telescopic rod, a contact assembly, a vibration detection assembly and a motor, the metal circular plate is rotationally connected with the annular electromagnetic shielding layer, the elastic telescopic rod is arranged on the metal circular plate, and the contact assembly is fixed to the movable end of the elastic telescopic rod. The technical problems that when a system short circuit occurs in an existing series capacitor, the mechanical stability of bearing huge electrodynamic force is poor, deformation or damage of a support when the support bears pressure is difficult to block, and fatigue or loosening of a heat dissipation structure in the support when the heat dissipation structure is stressed is difficult to warn are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of capacitors, in particular to a thyristor-controlled series capacitor device. BACKGROUND

[0002] Thyristor-controlled series capacitors are used in power systems as controllable devices connected in series with transmission lines, and the control provided is of the "impedance" type, used for controlled series compensation. The development of thyristor-controlled series capacitors has traditionally focused more on their electrical performance, control algorithms and system applications. However, the optimization of its mechanical structure is crucial for improving reliability, reducing costs, facilitating maintenance and promoting applications.

[0003] According to the search, the Chinese invention patent with the application number CN202211465129.0 discloses a series capacitor bank support, which can one-to-one correspondingly fix multiple capacitors in multiple accommodating cavities through the cooperation of the accommodating box and the connecting plate. The elastic support assembly is used to elastically support the capacitors to ensure that the two pole columns at the top end of the capacitors are respectively electrically connected with the corresponding contact sheets, thereby quickly realizing the series connection of multiple capacitors, facilitating assembly, not needing to use copper wires for welding connection, and not needing to replace all capacitors, which is conducive to the replacement and maintenance of individual capacitors.

[0004] The above-mentioned device has poor mechanical stability when the capacitor bank and the reactor appear system short circuit, and it is difficult to block the deformation or damage of the support when it bears pressure, and it is also difficult to early warn fatigue or looseness of the heat dissipation structure in the support when it is stressed. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a thyristor-controlled series capacitor device, which solves the technical problems of poor mechanical stability of the existing series capacitor when a system short circuit occurs, difficulty in blocking the deformation or damage of the support when it bears pressure, and difficulty in early warning fatigue or looseness of the heat dissipation structure in the support when it is stressed.

[0006] To solve the above technical problems, the present application provides the following technical solutions: A thyristor-controlled series capacitor device, comprising an accommodating box, an annular electromagnetic shielding layer is arranged in the accommodating box, a capacitor is arranged in the annular electromagnetic shielding layer, a heat dissipation cavity is arranged between the annular electromagnetic shielding layer and the inner wall of the accommodating box, a circular heat dissipation assembly is installed in the heat dissipation cavity, and a sealing assembly covering the heat dissipation cavity is fixedly connected to the top of the accommodating box; The circular heat dissipation assembly comprises a metal circular plate, an elastic telescopic rod, a contact head assembly, a vibration detection assembly and a motor, the metal circular plate is rotationally connected with the annular electromagnetic shielding layer, the elastic telescopic rod is arranged on the metal circular plate, the metal circular plate moves to an initial position under the double actions of the elasticity of the metal circular plate in deformation and the extrusion force of the vibration detection assembly, and the deformation degree of the metal circular plate under the extrusion of the electric power of the capacitor is reduced, the contact head assembly is fixed at the movable end of the elastic telescopic rod, the vibration detection assembly is fixed on the inner wall of the containing box, and the motor is fixed on the inner wall of the containing box.

[0007] Further, the vibration detection assembly comprises an arc-shaped elastic plate, an elastic support plate and a strain sensor, both ends of the arc-shaped elastic plate are fixed with the inner wall of the containing box, the middle region of the arc-shaped elastic plate is slidably connected with the metal circular plate, the elastic support plate is fixed between the arc-shaped elastic plate and the containing box, and the strain sensor is fixed on the arc-shaped elastic plate.

[0008] Further, the elastic telescopic rod comprises an elastic tube and an elastic rod, the elastic tube is fixedly connected with the metal circular plate, and the elastic rod extends into the elastic tube.

[0009] Further, one side of the elastic tube is provided with a side plate, the side plate extends into the elastic tube, and a plurality of springs are fixedly connected to one side of the side plate.

[0010] Further, the contact head assembly comprises an arc-shaped rod, an arc-shaped plate and a capillary tube, the arc-shaped rod is fixedly connected with the elastic rod, the arc-shaped plate is fixedly connected with the arc-shaped rod, and the capillary tube is fixed on both sides of the arc-shaped rod.

[0011] Further, the elastic tube is a semicircular tube, the elastic tube is open on the side facing the metal circular plate, the cross sections of the elastic rod and the arc-shaped rod are semicircles, and the elastic rod is slidably connected with the metal circular plate.

[0012] Further, the sealing assembly comprises an annular cover plate and a lifting block, the annular cover plate is fixedly connected with the containing box, the lifting block penetrates through the annular cover plate, and the bottom of the lifting block is arc-shaped.

[0013] Further, a water leakage hole is formed in the bottom of the containing box, a counterweight rod penetrates through the water leakage hole, a floating ball is fixedly connected to the top of the counterweight rod, and the diameter of the floating ball is greater than the inner diameter of the water leakage hole.

[0014] Further, a plurality of transverse blocks penetrating through the annular electromagnetic shielding layer are arranged in the upper half region of the annular electromagnetic shielding layer, and the transverse blocks are fixedly connected with limiting columns away from the metal circular plate.

[0015] By means of the above technical scheme, the application provides a thyristor control series capacitor device, which has at least the following beneficial effects: 1. The annular heat dissipation assembly is arranged, the deformation degree of the support can be reduced when the capacitor is subjected to the extrusion of electric force, the mechanical stability of the series capacitor when the system short circuit occurs is improved, the capacitor is supported by continuously replacing different areas of the metal round plate, the metal round plate has sufficient time to restore to the original state by using the elasticity after the local area is extruded and deformed, the extrusion degree of the metal round plate at different positions is uniform, and the possibility of metal fatigue caused by continuous extrusion at a single position is reduced, and the vibration detection assembly can early warn fatigue or looseness when subjected to force.

[0016] 2. The heat dissipation structure is distributed outside the annular electromagnetic shielding layer, the electromagnetic shielding structure and the heat dissipation structure are integrated, the internal electric field and thermal field distribution of the series capacitor can be optimized, and local overheating or corona discharge is avoided.

[0017] 3. The elastic telescopic rod, the contact head assembly and the side plate are arranged, the heat dissipation of the capacitor is combined by increasing the heat dissipation area and accelerating the air flow speed, and the heat dissipation capacity of the capacitor is improved.

[0018] 4. The lifting block, the contact head assembly, the side plate and the floating ball are arranged, the heat dissipation cavity can be closed when the capacitor generates less heat, the high-humidity air in the environment is prevented from entering the heat dissipation cavity, the opening on the annular cover plate is opened when the capacitor generates more heat, the air flow speed in the heat dissipation cavity is accelerated, the heated air in the heat dissipation cavity is discharged to the outside of the containing box, the capillary pipe increases the heat dissipation area of the capacitor on one hand and accelerates the condensation of the high-humidity air in the heat dissipation cavity on the other hand, and when the condensed water reaches a certain amount, the floating ball is pushed to rise to discharge the condensed water, so that the capacitor can better adapt to the high-humidity environment. DETAILED DESCRIPTION

[0019] The drawings described herein are used to provide further understanding of the present application, constitute a part of the present application, the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings: Figure 1 It is a structural schematic diagram of the whole application; Figure 2 It is an internal cutaway view of a single containing box of the application; Figure 3 It is a structural schematic diagram of the application Figure 2 It is a structural schematic diagram of the application Figure 4 It is a structural schematic diagram of the annular heat dissipation assembly of the application; Figure 5 It is a front view of the elastic telescopic rod and the contact head assembly of the application; Figure 6 It is a back view of the elastic telescopic rod and the contact head assembly of the application.

[0020] In the diagram: 1. Receiving box; 2. Annular electromagnetic shielding layer; 3. Heat dissipation cavity; 4. Circular heat dissipation assembly; 41. Metal circular plate; 42. Elastic telescopic rod; 421. Elastic tube; 422. Elastic rod; 43. Contact head assembly; 431. Arc rod; 432. Arc plate; 433. Capillary tube; 44. Vibration detection assembly; 441. Arc elastic plate; 442. Elastic support plate; 443. Strain sensor; 45. Motor; 5. Sealing assembly; 51. Annular cover plate; 52. Lifting block; 6. Side plate; 7. Spring; 8. Counterweight rod; 9. Float; 10. Horizontal block; 11. Limiting post; 12. Capacitor. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1 To improve the mechanical stability of capacitors under the enormous electrodynamic forces during system short circuits and reduce the possibility of capacitor support deformation under pressure, please refer to... Figures 1-3 This embodiment proposes a thyristor-controlled series capacitor device, including a housing 1, an annular electromagnetic shielding layer 2 inside the housing 1, a capacitor 12 inside the annular electromagnetic shielding layer 2, a heat dissipation cavity 3 between the annular electromagnetic shielding layer 2 and the inner wall of the housing 1, a circular heat dissipation assembly 4 installed in the heat dissipation cavity 3, and a sealing assembly 5 covering the heat dissipation cavity 3 fixedly connected to the top of the housing 1. The circular heat dissipation assembly 4 includes a metal circular plate 41, an elastic telescopic rod 42, a contact head assembly 43, a vibration detection assembly 44, and a motor 45. The metal circular plate 41 is rotatably connected to the annular electromagnetic shielding layer 2, the elastic telescopic rod 42 is disposed on the metal circular plate 41, the contact head assembly 43 is fixed to the movable end of the elastic telescopic rod 42, the vibration detection assembly 44 is fixed to the inner wall of the housing 1, and the motor 45 is fixed to the inner wall of the housing 1. The output end of the motor 45 is fixedly connected to the metal circular plate 41.

[0023] In use, multiple housing boxes 1 are connected in a straight line. Capacitors 12 are placed inside the annular electromagnetic shielding layer 2. Two adjacent capacitors 12 are connected to form a series connection. Circular heat dissipation components 4 are distributed on each side of the annular electromagnetic shielding layer 2. Metal circular plates 41 are tightly attached to the surface of the annular electromagnetic shielding layer 2. Vibration detection components 44 press the upper half of the metal circular plates 41 from the outer ring inward. When the metal circular plates 41 are subjected to the electrodynamic compression of the capacitors 12, they can move back to their initial position under the combined action of the elasticity of the metal circular plates 41 during deformation and the extrusion force of the vibration detection components 44, thereby reducing the degree of deformation of the metal circular plates 41 when subjected to the electrodynamic compression of the capacitors 12.

[0024] Simultaneously, the motor 45 drives the metal disc 41 to rotate periodically. After the upper half of the metal disc 41 is compressed by the capacitor 12 for a period of time, the compressed portion of the upper half of the metal disc 41 rotates and disengages from the capacitor 12 and the annular electromagnetic shielding layer 2. Utilizing the elasticity of the compressed metal disc 41, it gradually returns to its original shape, causing the other uncompressed portions of the metal disc 41 to rotate to contact the capacitor 12 and the annular electromagnetic shielding layer 2, thus protecting the capacitor 12. During the compression and deformation process of the upper half of the metal disc 41, the vibration detection component 44 performs detection and, based on the detection... Timely data warnings improve the buffer protection capability of the capacitor, reduce the deformation of the support when subjected to electrodynamic compression of capacitor 12, improve the mechanical stability of the series capacitor under huge electrodynamic forces when a system short circuit occurs, and continuously replace different areas of the metal disc 41 to support the capacitor, so that the metal disc 41 has enough time to recover its original shape by its own elasticity after being compressed and deformed in a local area, keep the degree of compression of different positions of the metal disc 41 uniform, and reduce the possibility of metal fatigue caused by continuous compression of a single position. The vibration detection component 44 can provide early warning of fatigue or loosening when under force.

[0025] To improve the effect of the enormous electrodynamic force of the capacitor on the support during a system short circuit, and thus better handle system short circuit situations involving the capacitor, refer to... Figure 1 The upper half of the annular electromagnetic shielding layer 2 is provided with multiple horizontal blocks 10 that penetrate the annular electromagnetic shielding layer 2. The side of the horizontal block 10 away from the metal circular plate 41 is fixedly connected to a limit post 11.

[0026] When in use, the huge electrodynamic force of capacitor 12 when a system short circuit occurs pushes the limiting post 11 and the horizontal block 10, causing the horizontal block 10 to move outward from the annular electromagnetic shielding layer 2 and squeeze the upper half of the metal disc 41. This allows the force of capacitor 12 to pass through the annular electromagnetic shielding layer 2 better and act on the metal disc 41, thus deforming the metal disc 41 and providing protection for capacitor 12.

[0027] By utilizing the heat dissipation structure distributed on the outside of the annular electromagnetic shielding layer 2, the electromagnetic shielding structure and the heat dissipation structure are integrated into a single design, which can optimize the distribution of the electric field and thermal field inside the series capacitor and avoid local overheating or corona discharge.

[0028] Example 2 To provide timely warning of metal fatigue in the metal disc 41 under continuous compression by the capacitor 12, refer to Figures 1-4 Based on Embodiment 1, the vibration detection component 44 includes an arc-shaped elastic plate 441, an elastic support plate 442, and a strain sensor 443. Both ends of the arc-shaped elastic plate 441 are fixed to the inner wall of the receiving box 1, and the middle area of ​​the arc-shaped elastic plate 441 is slidably connected to the metal circular plate 41. The elastic support plate 442 is fixed between the arc-shaped elastic plate 441 and the receiving box 1, and the strain sensor 443 is fixed on the arc-shaped elastic plate 441.

[0029] In use, the upper half of the metal circular plate 41 is deformed after being squeezed by the capacitor 12, which in turn pushes the arc-shaped elastic plate 441 and the elastic support plate 442 to bend and deform. Then, the metal circular plate 41, the arc-shaped elastic plate 441 and the elastic support plate 442 move back to their initial positions under their own elastic force. During the back-and-forth movement of the arc-shaped elastic plate 441, the strain sensor 443 detects the displacement data of the arc-shaped elastic plate 441 and issues an alarm in time when the strain of the arc-shaped elastic plate 441 is large.

[0030] Example 3 To improve the heat dissipation capacity of the capacitor, refer to Figures 1-6 Based on Embodiment 1, the elastic telescopic rod 42 includes an elastic tube 421 and an elastic rod 422. The elastic tube 421 is fixedly connected to the metal circular plate 41, and the elastic rod 422 extends into the elastic tube 421. A side plate 6 is provided on one side of the elastic tube 421, and the side plate 6 extends into the elastic tube 421. A plurality of springs 7 are fixedly connected to one side of the side plate 6. The contact head assembly 43 includes an arc-shaped rod 431, an arc-shaped plate 432, and a capillary tube 433. The arc-shaped rod 431 is fixedly connected to the elastic rod 422, the arc-shaped plate 432 is fixedly connected to the arc-shaped rod 431, and the capillary tube 433 is fixed on both sides of the arc-shaped rod 431.

[0031] In use, the elastic telescopic rod 42 enhances the elasticity of the metal disc 41, enabling the metal disc 41 to better recover its original shape when subjected to compression deformation. The spring 7 pushes the side plate 6 to move to the outside of the elastic tube 421. During the rotation of the metal disc 41 driven by the motor 45, the side plate 6 rotates synchronously with the metal disc 41, which accelerates the air flow in the heat dissipation cavity 3. At the same time, the heat on the surface of the capacitor 12 is transferred to the metal disc 41, the elastic telescopic rod 42 and the capillary tube 433 through the annular electromagnetic shielding layer 2. The arc rod 431 and the capillary tube 433 increase the heat dissipation area. The capacitor 12 can be dissipated by combining the increase of heat dissipation area and the acceleration of air flow speed, thereby improving the heat dissipation capacity of the capacitor.

[0032] To adapt capacitors to high humidity environments, refer to Figure 2 , Figure 5 and Figure 6 The elastic tube 421 is a semi-circular tube with an opening facing the metal circular plate 41. The elastic rod 422 and the arc rod 431 both have semi-circular cross sections. The elastic rod 422 is slidably connected to the metal circular plate 41. The sealing assembly 5 includes an annular cover plate 51 and a lifting block 52. The annular cover plate 51 is fixedly connected to the receiving box 1. The lifting block 52 passes through the annular cover plate 51 and has an arc-shaped bottom. The receiving box 1 has a water leakage hole at the bottom and a counterweight rod 8 that passes through the water leakage hole inside the receiving box 1. A float 9 is fixedly connected to the top of the counterweight rod 8. The diameter of the float 9 is larger than the inner diameter of the water leakage hole.

[0033] In use, the annular cover plate 51 blocks the opening of the heat dissipation cavity 3, reducing the entry of high-humidity air into the heat dissipation cavity. When the capacitor 12 dissipates less heat, the motor 45 drives the metal disc 41 to rotate slowly, only serving the purpose of ensuring that different areas of the metal disc 41 are in uniform contact with the upper part of the capacitor 12. When the capacitor 12 dissipates more heat, the motor 45 drives the metal disc 41 to rotate faster. On the one hand, this enhances the air cooling effect of the side plate 6 on the heat dissipation cavity 3, and on the other hand, it causes the contact head assembly 43 to move towards the outer ring of the metal disc 41 after centrifugation. When the contact head assembly 43 moves close to the annular cover plate 51, the contact head assembly 43 moving towards the outer ring pushes the lifting block 52 upward, so that after the lifting block 52 rises, it no longer completely blocks the annular cover plate 51, allowing the heated air in the heat dissipation cavity 3 to move out of the receiving box 1. The capillary tube 433 accelerates the flow of air into the heat dissipation cavity 3. The humid air condenses, and the condensed water droplets fall to the bottom of the container 1. As the condensate gradually increases, it pushes the float 9 to rise, so that the float 9 no longer blocks the drain hole, and the condensate at the bottom of the container 1 is discharged from the drain hole. After the float 9 falls, it blocks the drain hole again. This can close the heat dissipation cavity 3 when the capacitor 12 generates less heat, reducing the entry of high-humidity air into the heat dissipation cavity 3. When the capacitor 12 generates more heat, the opening on the annular cover plate 51 is opened, and the air flow speed in the heat dissipation cavity 3 is accelerated, so that the heated air in the heat dissipation cavity 3 is discharged to the outside of the container 1 more quickly. The capillary tube 433 is used to increase the heat dissipation area of ​​the capacitor on the one hand, and accelerate the condensation of high-humidity air in the heat dissipation cavity 3 on the other hand. After the condensate reaches a certain amount, it pushes the float 9 to rise and discharge the condensate, so that the capacitor 12 can better adapt to the high-humidity environment.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A thyristor-controlled series capacitor device, comprising a housing (1), characterized in that, The container (1) is provided with an annular electromagnetic shielding layer (2), the capacitor (12) is provided in the annular electromagnetic shielding layer (2), a heat dissipation cavity (3) is provided between the annular electromagnetic shielding layer (2) and the inner wall of the container (1), a circular heat dissipation component (4) is installed in the heat dissipation cavity (3), and a sealing component (5) covering the heat dissipation cavity (3) is fixedly connected to the top of the container (1). The circular heat dissipation assembly (4) includes a metal circular plate (41), an elastic telescopic rod (42), a contact head assembly (43), a vibration detection assembly (44), and a motor (45). The metal circular plate (41) is rotatably connected to the annular electromagnetic shielding layer (2). The elastic telescopic rod (42) is located on the metal circular plate (41). The metal circular plate (41) moves to its initial position under the combined action of its own elasticity during deformation and the squeezing force of the vibration detection assembly (44), reducing the degree of deformation of the metal circular plate (41) when subjected to the electrodynamic squeezing of the capacitor (12). The contact head assembly (43) is fixed to the movable end of the elastic telescopic rod (42). The vibration detection assembly (44) is fixed to the inner wall of the receiving box (1). The motor (45) is fixed to the inner wall of the receiving box (1). The output end of the motor (45) is fixedly connected to the metal circular plate (41).

2. The thyristor-controlled series capacitor device according to claim 1, characterized in that, The vibration detection assembly (44) includes an arc-shaped elastic plate (441), an elastic support plate (442), and a strain sensor (443). Both ends of the arc-shaped elastic plate (441) are fixed to the inner wall of the receiving box (1), and the middle area of ​​the arc-shaped elastic plate (441) is slidably connected to the metal circular plate (41). The elastic support plate (442) is fixed between the arc-shaped elastic plate (441) and the receiving box (1), and the strain sensor (443) is fixed on the arc-shaped elastic plate (441).

3. The thyristor-controlled series capacitor device according to claim 1, characterized in that, The elastic telescopic rod (42) includes an elastic tube (421) and an elastic rod (422). The elastic tube (421) is fixedly connected to the metal circular plate (41), and the elastic rod (422) extends into the elastic tube (421).

4. A thyristor-controlled series capacitor device according to claim 3, characterized in that, The elastic tube (421) has a side plate (6) on one side, which extends into the elastic tube (421), and a plurality of springs (7) are fixedly connected to one side of the side plate (6).

5. A thyristor-controlled series capacitor device according to claim 3, characterized in that, The contact head assembly (43) includes an arc-shaped rod (431), an arc-shaped plate (432), and a capillary tube (433). The arc-shaped rod (431) is fixedly connected to the elastic rod (422), the arc-shaped plate (432) is fixedly connected to the arc-shaped rod (431), and the capillary tube (433) is fixed on both sides of the arc-shaped rod (431).

6. A thyristor-controlled series capacitor device according to claim 5, characterized in that, The elastic tube (421) is a semi-circular tube with an opening facing the metal circular plate (41). The elastic rod (422) and the arc rod (431) both have semi-circular cross sections, and the elastic rod (422) is slidably connected to the metal circular plate (41).

7. A thyristor-controlled series capacitor device according to claim 5, characterized in that, The sealing assembly (5) includes an annular cover plate (51) and a lifting block (52). The annular cover plate (51) is fixedly connected to the receiving box (1), and the lifting block (52) passes through the annular cover plate (51). The bottom of the lifting block (52) is an arc surface.

8. A thyristor-controlled series capacitor device according to claim 1, characterized in that, The container (1) has a water leakage hole at the bottom and a counterweight rod (8) that passes through the water leakage hole inside the container (1). A float (9) is fixedly connected to the top of the counterweight rod (8). The diameter of the float (9) is larger than the inner diameter of the water leakage hole.

9. A thyristor-controlled series capacitor device according to claim 1, characterized in that, The upper half of the annular electromagnetic shielding layer (2) is provided with multiple horizontal blocks (10) that penetrate the annular electromagnetic shielding layer (2). The side of the horizontal block (10) away from the metal circular plate (41) is fixedly connected to a limit post (11).

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