Composite lightning arrester for power station

Abstract

The utility model discloses a kind of composite lightning arresters for power station belong to lightning arrester technical field, a kind of composite lightning arresters for power station, including composite outer cover, the outer end of composite outer cover is fixedly connected with insulator string, the inside of composite outer cover is sleeved with core body, the both sides of composite outer cover are equipped with end cap, and end cap is sleeved in the outside of core body;The utility model, high-temperature band is wound on electrode and resistance chip, after that, it is made into core body by injecting durometer material outside it, after that, core body is sleeved in the inside of composite outer cover, and it is vulcanized into lightning arrester body with composite outer cover, then composite outer cover and core body are fastened and installed between by nut, resistance chip in core body is inserted with aluminium spacer, so that lightning arrester when bearing multiple lightning overvoltage impact, through aluminium spacer layer by layer barrier, its resistance chip damage degree is weakened compared to before, improve lightning arrester high current impact resistance, enhance the service life of lightning arrester whole.

Description

Technical Field

[0001] This utility model relates to the field of surge arrester technology, and more specifically, to a composite surge arrester for power plants. Background Technology

[0002] A surge arrester is an electrical device used to protect electrical equipment from high transient overvoltage hazards caused by lightning strikes and to limit the duration and amplitude of follow current. It is connected between the cable and the ground, usually in parallel with the protected equipment. Surge arresters effectively protect communication equipment. In the event of an abnormal voltage, the surge arrester will activate to provide protection. The main function of a surge arrester is to reduce the amplitude of intrusive current waves through parallel discharge gaps or nonlinear resistors, thereby lowering the overvoltage value experienced by the protected equipment and protecting communication lines and equipment.

[0003] Existing conventional surge arresters used in power plants contain internal resistance elements, which are simply stacked pieces to form the core. When subjected to large current surges, their withstand capability is relatively weak, thus affecting the overall performance and lifespan of the surge arrester. Therefore, there is an urgent need to improve the technology of composite surge arrester structure for power plants to perfect this equipment. Utility Model Content

[0004] 1. Technical problem to be solved: To address the problems existing in the prior art, the purpose of this utility model is to provide a composite surge arrester for power plants. When using the composite surge arrester for power plants, a high-temperature strip is wound around the electrodes and resistor elements, and then a Duratin material is injection molded onto the outside to form the core. Aluminum gaskets are inserted between the resistor elements within the core. This allows the surge arrester to withstand multiple lightning overvoltage impacts, with the aluminum gaskets providing layered protection, thus reducing the damage to the resistor elements compared to previous methods. This improves the surge arrester's high-current impulse withstand capability and enhances its overall service life.

[0005] 2. Technical Solution: To solve the above problems, the present invention adopts the following technical solution.

[0006] A composite surge arrester for power plants includes a composite jacket, an insulator string fixedly connected to the outer end of the composite jacket, a core sleeved inside the composite jacket, end caps on both sides of the composite jacket, the end caps sleeved on the outside of the core, nuts threaded onto the outer ends of both sides of the core, an anti-reverse mechanism between the nuts and the core to prevent the nuts from rotating in the opposite direction and loosening, and a sealing mechanism between the nuts and the core to seal the ends of the core and between the core and the end caps.

[0007] Preferably, electrodes are provided at the left and right sides of the core, four resistive sheets are provided between the electrodes, aluminum pads are provided between the resistive sheets, and a high-temperature strip is provided inside the core, which is wound around the electrodes and resistive sheets.

[0008] Preferably, the end cap is provided with a limiting cap on the side away from the composite outer sleeve, and a guide groove is provided at the end of the end cap near the limiting cap. A guide post is fixedly connected to the end of the limiting cap corresponding to the guide groove. Multiple protrusions are provided at the outer end of the guide post. A disc spring is provided between the limiting cap and the end cap. The disc spring is sleeved on the outside of the core. A first wedge is provided on the surface of the limiting cap near the nut. A second wedge is provided at the end of the nut near the first wedge. The slopes of the first wedge and the second wedge are set in opposite directions.

[0009] Preferably, the cross-sections of the guide groove and the guide post are circular, and the centers of the cross-sections of the guide groove and the guide post coincide.

[0010] Preferably, the cross-section of the bump is semi-circular, and the material of the bump is rubber.

[0011] Preferably, a hemispherical sealing cap is fixedly connected to the outer end of the nut, and an annular sealing cover is fixedly connected to the other end of the nut. A sealing gasket is provided at the contact point between the sealing cover and the end cap.

[0012] 3. Beneficial effects: Compared with the prior art, the beneficial effects of this utility model are as follows: (1) In this utility model, a high-temperature strip is wound around the electrode and the resistor sheet, and then the outside of it is injection molded with Duratin material to form the core. The core is then fitted into the inside of the composite jacket and vulcanized with the composite jacket to form the arrester body. Then, the composite jacket and the core are fastened together with nuts. Aluminum gaskets are inserted between the resistor sheets in the core, so that when the arrester is subjected to multiple lightning overvoltage impacts, the aluminum gaskets provide layer-by-layer protection, and the damage to the resistor sheets is reduced compared to before. This improves the arrester's high current impact withstand capability and enhances the overall service life of the arrester.

[0013] (2) In this utility model, after the core is fitted inside the composite jacket, the disc spring and the limiting cover are fitted on both ends of the core, so that the limiting cover drives the guide post to be inserted into the guide groove. Then, the nut is rotated until the second wedge on the end face of the nut abuts against the first wedge. The nut is rotated again, and the allowance generated by the deformation of the disc spring causes the nut to drive the second wedge to be misaligned and locked with the first wedge, thereby smoothly avoiding the loosening caused by the reverse rotation of the nut. At the same time, the sealing cover and sealing cover can seal the end of the core and the contact point between the core and the end cover, which can effectively prevent rainwater from flowing into the core and the composite jacket, further improving the overall sealing performance of the surge arrester. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the internal cross-sectional structure of this utility model; Figure 3 This is a schematic diagram of the anti-reverse rotation structure of the nut of this utility model; Figure 4 This utility model Figure 2 A magnified view of the structure at point A in the middle; Figure 5 This utility model Figure 3 A magnified schematic diagram of the structure at point B in the middle.

[0015] 1. Composite jacket; 2. Insulator string; 3. Core; 301. Electrode; 302. Resistance element; 303. Aluminum gasket; 304. High-temperature strip; 4. End cap; 5. Limiting cap; 6. Guide groove; 7. Guide post; 8. Protrusion; 9. Disc spring; 10. Nut; 11. First wedge; 12. Second wedge; 13. Sealing cap; 14. Sealing cover; 15. Sealing gasket. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model. Example

[0017] Please see Figure 1-5 A composite surge arrester for power plants includes a composite jacket 1, an insulator string 2 fixedly connected to the outer end of the composite jacket 1, a core 3 sleeved inside the composite jacket 1, end caps 4 on both sides of the composite jacket 1, the end caps 4 sleeved on the outside of the core 3, nuts 10 threadedly sleeved on the outer ends of both sides of the core 3, an anti-reverse mechanism between the nuts 10 and the core 3, the anti-reverse mechanism can prevent the nuts 10 from rotating in the opposite direction and loosening, and a sealing mechanism between the nuts 10 and the core 3, the sealing mechanism seals the end of the core 3 and the space between the core 3 and the end caps 4.

[0018] High-temperature strip 304 is wound around electrode 301 and resistor 302, and then Dulleyton material is injected into the outside to form core 3. Core 3 is then fitted into the inside of composite jacket 1 and vulcanized with composite jacket 1 to form the arrester body. Then, the composite jacket 1 and core 3 are fastened together with nut 10. Aluminum gaskets 303 are inserted between resistors 302 inside core 3. When the arrester is subjected to multiple lightning overvoltage impacts, the aluminum gaskets 303 provide layer-by-layer protection, reducing the damage to resistors 302 and improving the arrester's high current impulse withstand capability, thus enhancing the overall service life of the arrester.

[0019] Please see Figure 2 The core 3 has electrodes 301 on the left and right sides, four resistors 302 between the electrodes 301, aluminum pads 303 between the resistors 302, and a high-temperature band 304 inside the core 3, which is wound around the electrodes 301 and resistors 302.

[0020] The high-temperature strip 304 is wound around the electrode 301 and the resistor sheet 302, and then the core 3 is formed by injection molding of Duratin material on the outside. The core 3 is then fitted into the inside of the composite jacket 1 and vulcanized with the composite jacket 1 to form the arrester body.

[0021] Please see Figure 2-5 A limiting cover 5 is provided on the side of the end cap 4 away from the composite outer jacket 1. A guide groove 6 is provided on the end of the end cap 4 near the limiting cover 5. A guide post 7 is fixedly connected to the end of the limiting cover 5 corresponding to the guide groove 6. Multiple protrusions 8 are provided on the outer end of the guide post 7. A disc spring 9 is provided between the limiting cover 5 and the end cap 4. The disc spring 9 is sleeved on the outside of the core 3. A first wedge 11 is provided on the surface of the limiting cover 5 near the nut 10. A second wedge 12 is provided on the end of the nut 10 near the first wedge 11. The slopes of the first wedge 11 and the second wedge 12 are set in opposite directions.

[0022] By setting the slope trends of the first wedge 11 and the second wedge 12 to be opposite, when the nut 10 is rotated and the second wedge 12 on the end face of the nut 10 abuts against the first wedge 11, the nut 10 can continue to rotate. The allowance generated by the deformation of the disc spring 9 causes the nut 10 to drive the second wedge 12 to be misaligned and locked with the first wedge 11, thereby successfully avoiding loosening caused by the reverse rotation of the nut 10.

[0023] Please see Figure 2-4 The cross-sections of the guide groove 6 and the guide post 7 are circular, and the centers of the cross-sections of the guide groove 6 and the guide post 7 coincide. The cross-section of the protrusion 8 is semi-circular, and the material of the protrusion 8 is rubber. A hemispherical sealing cover 13 is fixedly connected to the outer end of the nut 10, and an annular sealing cover 14 is fixedly connected to the other end of the nut 10. A sealing gasket 15 is provided at the contact point between the sealing cover 14 and the end cover 4.

[0024] By setting the sealing cover 13 and the sealing cover 14, the end of the core 3 and the contact point between the core 3 and the end cover 4 can be sealed, which can effectively prevent rainwater from flowing into the core 3 and the composite outer sleeve 1, and further improve the overall sealing performance of the surge arrester.

[0025] Working principle: When using this composite surge arrester for power plants, firstly, a high-temperature strip 304 is wound around the electrode 301 and the resistor 302. Then, a Duratin material is injected into the outside to form the core 3. The core 3 is then fitted into the inside of the composite outer sleeve 1 and vulcanized with the composite outer sleeve 1 to form the surge arrester body. Then, the composite outer sleeve 1 and the core 3 are fastened together with nuts 10. Aluminum gaskets 303 are inserted between the resistors 302 inside the core 3. When the surge arrester is subjected to multiple lightning overvoltage impacts, the aluminum gaskets 303 provide layer-by-layer protection, reducing the damage to the resistors 302. This improves the surge arrester's high current impact withstand capability and enhances the overall service life of the surge arrester. After the core 3 is fitted inside the composite outer sleeve 1, the disc spring 9 and the limiting cover 5 are fitted onto both ends of the core 3, so that the limiting cover 5 drives the guide post 7 to insert into the guide groove 6. Then, the nut 10 is rotated until the second wedge 12 on the end face of the nut 10 abuts against the first wedge 11. The nut 10 is rotated further, and the allowance generated by the deformation of the disc spring 9 causes the nut 10 to drive the second wedge 12 to engage with the first wedge 11 in a misaligned manner, thus successfully preventing the loosening caused by the reverse rotation of the nut 10. At the same time, the sealing cover 13 and the sealing cover 14 can seal the end of the core 3 and the contact point between the core 3 and the end cover 4, which can effectively prevent rainwater from flowing into the space between the core 3 and the composite outer sleeve 1, further improving the overall sealing performance of the surge arrester.

[0026] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite surge arrester for power plants, comprising a composite jacket (1), characterized in that: An insulator string (2) is fixedly connected to the outer end of the composite jacket (1). A core (3) is sleeved inside the composite jacket (1). End caps (4) are provided on both sides of the composite jacket (1). The end caps (4) are sleeved on the outside of the core (3). Nuts (10) are threaded onto the outside of both ends of the core (3). An anti-reverse mechanism is provided between the nut (10) and the core (3). The anti-reverse mechanism can prevent the nut (10) from rotating in the opposite direction and loosening. A sealing mechanism is provided between the nut (10) and the core (3). The sealing mechanism seals the end of the core (3) and the space between the core (3) and the end caps (4).

2. A composite surge arrester for power plants according to claim 1, characterized in that: The core (3) includes electrodes (301), resistors (302), aluminum pads (303), and a high-temperature band (304). Electrodes (301) are provided on the left and right sides of the core (3). Four resistors (302) are provided between the electrodes (301). Aluminum pads (303) are provided between the resistors (302). A high-temperature band (304) is provided inside the core (3). The high-temperature band (304) is wound around the electrodes (301) and resistors (302).

3. A composite surge arrester for power plants according to claim 1, characterized in that: The anti-reverse mechanism includes a limiting cover (5), a guide groove (6), a guide post (7), a protrusion (8), a disc spring (9), a first wedge (11), and a second wedge (12). The end cover (4) is provided with a limiting cover (5) on the side away from the composite outer jacket (1). The end cover (4) is provided with a guide groove (6) at the end near the limiting cover (5). The end of the limiting cover (5) is fixedly connected to the guide post (7) at the end corresponding to the guide groove (6). The outer end of the guide post (7) is provided with multiple protrusions (8). A disc spring (9) is provided between the limiting cover (5) and the end cover (4). The disc spring (9) is sleeved on the outside of the core (3). The surface of the limiting cover (5) near the nut (10) is provided with a ring of first wedges (11). The end of the nut (10) near the first wedges (11) is provided with a ring of second wedges (12). The slopes of the first wedges (11) and the second wedges (12) are set in opposite directions.

4. A composite surge arrester for power plants according to claim 3, characterized in that: The cross-sections of the guide groove (6) and the guide post (7) are circular, and the centers of the cross-sections of the guide groove (6) and the guide post (7) coincide.

5. A composite surge arrester for power plants according to claim 3, characterized in that: The cross-section of the protrusion (8) is semi-circular, and the material of the protrusion (8) is rubber.

6. A composite surge arrester for power plants according to claim 1, characterized in that: The sealing mechanism includes a sealing cap (13), a sealing cover (14), and a sealing gasket (15). The outer end of the nut (10) is fixedly connected to a hemispherical sealing cap (13), and the other end of the nut (10) is fixedly connected to an annular sealing cover (14). A sealing gasket (15) is provided at the contact point between the sealing cover (14) and the end cap (4).

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