Switching assembly protection structure and wind power converter

Abstract

The utility model discloses a switch subassembly protection structure and wind power converter. Switch subassembly protection structure includes switch device, protection cover suite, insulating sleeve and conducting part, and switch device is connected with conducting part through wiring end, and protection cover suite is the nonmetal piece of cover and is arranged in the overlap position outside of switch device and conducting body, and insulating sleeve is wrapped in the outer surface of conducting part. The utility model discloses a switch device, protection cover suite, insulating sleeve and conducting part, have formed a reliable component of external insulation, and the electrification part is isolated from the outside, so that when the wind power converter in the cabinet body fragile device failure needs maintenance, can live maintenance, can avoid the power generation loss caused by the shutdown maintenance, thereby the maintenance cost of equipment is greatly reduced, and simultaneously, the electrification part is isolated from the outside, greatly reduces the risk of arc fault in the cabinet body of wind power converter, reduces the security risk of maintenance personnel, thereby guarantees the safety of maintenance personnel.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment protection technology, and in particular to a protection structure for a switch assembly and a wind power converter. Background Technology

[0002] As a crucial component of wind power generation systems, wind power converters perform multiple functions, including power conversion, grid-connected power transmission, and fault protection. Therefore, high requirements are placed on their reliability, safety, and conversion efficiency. Meanwhile, with the continuous increase in the voltage and capacity of individual wind power units, the economic benefits generated per unit of electricity generated are becoming increasingly higher. Due to considerations of power conversion efficiency and operating costs, more and more customers are demanding live-line maintenance for wind power converters.

[0003] Figure 1 The diagram illustrates the power flow components of a mainstream wind turbine converter, including a switching device 10 and a conductive element 50 for controlling the on / off state of the circuit. The switching device 10 and the conductive element 50 are connected via a terminal 11. However, the exposed terminal 11 and conductive element 50 cannot meet the requirements for live maintenance. When maintenance is required on vulnerable components inside the wind turbine converter cabinet, the main circuit breaker of the upstream transformer needs to be disconnected, resulting in a loss of power generation revenue during this phase and increasing equipment maintenance costs. Simultaneously, the exposure of the terminal 11 and conductive element 50 creates unpredictable electrical safety hazards within the wind turbine converter environment, significantly increasing the risk of arcing faults threatening the safety of maintenance personnel inside the cabinet.

[0004] In summary, existing wind power converters cannot be maintained under power when vulnerable components inside the cabinet fail, and arcing faults can easily occur inside the cabinet, threatening the safety of maintenance personnel. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a protective structure for a switch assembly and a wind power converter, so as to solve the problem that when the vulnerable components inside the cabinet of the existing wind power converter fail and need maintenance, it is impossible to perform maintenance under power and the arc fault inside the cabinet is prone to occur, which threatens the safety of maintenance personnel.

[0006] This utility model provides a protective structure for a switch assembly, including a switch device, a protective cover kit, an insulating sleeve, and a conductive component. The switch device includes a terminal connected to the conductive component. The protective cover kit is a non-metallic component that covers the outside of the overlap position between the switch device and the conductive component. The insulating sleeve wraps around the outer surface of the conductive component.

[0007] Preferably, the protective cover kit includes a detachably connected front cover assembly and a rear cover assembly, wherein the front cover assembly is connected to the rear cover assembly via a detachable connector to form the protective cover kit.

[0008] Preferably, the front cover assembly of the protective cover is provided with a front cover air inlet hole, and the rear cover assembly of the protective cover is provided with a rear cover air inlet hole.

[0009] Preferably, the protective cover rear cover assembly includes an outer rear cover and an inner rear cover. The inner rear cover is fixedly connected to the terminal block and has a rear cover air inlet slot. The outer rear cover is fixedly connected to the outside of the inner rear cover and covers the rear cover air inlet slot. The outer rear cover has a rear cover air inlet sealing hole, and the rear cover air inlet sealing hole and the rear cover air inlet slot are spatially staggered. The protective cover front cover assembly includes an outer front cover and an inner front cover. The inner front cover is fixedly connected to the inner rear cover via the detachable connector. The inner front cover has a front cover air inlet slot. The outer front cover is fixedly connected to the outside of the inner front cover and covers the front cover air inlet slot. The outer front cover has a front cover air inlet sealing hole, and the front cover air inlet sealing hole and the front cover air inlet slot are spatially staggered.

[0010] Preferably, the inner rear cover has two rear cover air inlet slots, which are located on the left and right sides of the outer side plate of the inner rear cover, and the rear cover air inlet hole is located in the middle area of ​​the outer rear cover; the inner front cover has two front cover air inlet slots, which are located on the left and right sides of the inner front cover, and the front cover air inlet hole is located in the middle area of ​​the outer front cover.

[0011] Preferably, the terminal block is provided with an insulating support, the inner back cover is fixedly connected to the insulating support by a fastener, and the bottom of the inner back cover abuts against the outer surface of the switching device.

[0012] Preferably, the detachable connector is a bolt or snap-fit ​​structure.

[0013] Preferably, the insulating sleeve is a heat-shrinkable sleeve.

[0014] Another aspect of this utility model provides a wind power converter, which includes the aforementioned switch assembly protection structure.

[0015] The aforementioned switch assembly protection structure and wind power converter, through the switching devices, protective cover kit, insulating sleeve, and conductive components, form a reliable assembly with external insulation and isolation of live parts from the outside. This allows for live maintenance when vulnerable components inside the wind power converter malfunction and require maintenance, avoiding power generation loss due to downtime maintenance and significantly reducing equipment maintenance costs. At the same time, the isolation of live parts from the outside greatly reduces the risk of arcing faults inside the wind power converter cabinet, lowering the safety risks for maintenance personnel and ensuring their safety. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the switching assembly in an existing wind power converter;

[0017] Figure 2 This is a three-dimensional structural diagram of the protective structure of the switch assembly in one embodiment of the present utility model;

[0018] Figure 3 This is a schematic diagram of the split structure of the switch assembly protection structure in one embodiment of the present utility model;

[0019] Figure 4 This is a schematic diagram of the internal structure of the protective cover kit in one embodiment of the present utility model;

[0020] Figure 5 This is a cross-sectional schematic diagram of the protective cover kit in one embodiment of the present invention. Detailed Implementation

[0021] To enable those skilled in the art to more clearly understand the purpose, technical solution and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] This invention provides a protective structure for a switch assembly.

[0023] like Figure 2 As shown, in one embodiment of this utility model, the protective structure of the switch assembly includes a switch device 10, a protective cover kit 20, an insulating sleeve 40, and a conductive element 50. The switch device 10 is an electrical component that performs the function of switching the circuit on the main power current, and can be a contactor, disconnector, or circuit breaker, etc.; the protective cover kit 20 is a non-metallic component; the insulating sleeve 40 is a heat-shrinkable sleeve that can meet the voltage withstand and insulation requirements of the electrical system; the conductive element 50 can be a copper busbar, aluminum busbar, or cable, etc.

[0024] The switching device 10 is connected to the conductive element 50 via the terminal 11. The protective cover kit 20 covers the outside of the overlap position between the switching device 10 and the conductive element 50. The insulating sleeve 40 wraps around the outer surface of the conductive element 50.

[0025] The switch assembly protection structure in this embodiment, through the switch device, protective cover kit, insulating sleeve, and conductive components, forms a reliable assembly with external insulation and isolation of live parts from the outside. This allows for live maintenance of the wind power converter when vulnerable components inside the cabinet fail, avoiding power generation loss due to downtime maintenance and significantly reducing equipment maintenance costs. At the same time, the isolation of live parts from the outside greatly reduces the risk of arcing faults inside the wind power converter cabinet, lowering the safety risks for maintenance personnel and ensuring their safety.

[0026] like Figure 2-3 As shown, in a preferred embodiment of this utility model, the protective cover kit 20 includes a detachably connected front cover assembly 21 and a rear cover assembly 22. The front cover assembly 21 is connected to the rear cover assembly 22 via a detachable connector 30 to form the protective cover kit 20. The detachable connector 30 is a connector that connects the front cover assembly 21 and the rear cover assembly 22. It can be a bolt or a snap-fit ​​structure, which enables a detachable connection between the front cover assembly 21 and the rear cover assembly 22. When maintaining the switching device 10, the front cover assembly 21 can be easily disassembled.

[0027] The contact surface between the switching device 10 and the conductor 50 generates significant heat due to the large current. To meet the heat dissipation requirements of the conductor contact surface, this invention provides a front cover air inlet vent on the front cover assembly 21 and a rear cover air inlet vent on the rear cover assembly 22. The diameter of the front and rear cover air inlets is designed to both allow airflow and block foreign objects, ensuring that the protective cover kit 20 meets the IP4X protection level requirements. Cool airflow enters through the front cover air inlet vent, carrying away heat from the terminal 11 and the conductor 50, while hot airflow carrying heat exits through the rear cover air inlet vent, thus meeting the heat dissipation requirements of the conductor contact surface. The air inlet vent design of the protective cover kit 20, while meeting arc protection requirements, also satisfies the heat dissipation requirements of the conductor contact surface and the IP4X protection level requirements, thereby greatly reducing the risk of electric shock caused by foreign objects touching live parts.

[0028] like Figure 3-5 As shown, in a preferred embodiment of the present invention, the protective cover back cover assembly 22 includes an outer back cover 221 and an inner back cover 222. The inner back cover 222 is fixedly connected to the terminal 11. The inner back cover 222 is provided with a back cover air inlet groove 224. The outer back cover 221 is fixedly connected to the outside of the inner back cover 222 and covers the back cover air inlet groove 224. The outer back cover 221 is provided with a back cover air inlet hole 223. The back cover air inlet hole 223 and the back cover air inlet groove 224 are spatially staggered to form a double-layer staggered opening structure. The protective cover front cover assembly 21 includes an outer front cover 211 and an inner front cover 212. The inner front cover 212 is fixedly connected to the inner rear cover 222 via the detachable connector 30. The inner front cover 212 is provided with a front cover air inlet groove 214. The outer front cover 211 is fixedly connected to the outside of the inner front cover 212 and covers the front cover air inlet groove 214. The outer front cover 211 is provided with a front cover air inlet hole 213. The front cover air inlet hole 213 and the front cover air inlet groove 214 are spatially staggered to form a double-layer staggered opening structure.

[0029] In this embodiment, the inner rear cover 222 is provided with two rear cover air inlet slots 224, which are located on the left and right sides of the outer side plate 2221 of the inner rear cover 222. The rear cover air inlet hole 223 is located in the middle area of ​​the outer rear cover 221. The inner front cover 212 is provided with two front cover air inlet slots 214, which are located on the left and right sides of the inner front cover 212. The front cover air inlet hole 213 is located in the middle area of ​​the outer front cover 211. Of course, in other embodiments, a rear cover air inlet slot 224 can be provided in the middle area of ​​the inner rear cover 222, and a corresponding rear cover air inlet hole 223 can be provided on the left and right sides of the outer rear cover 221; or a front cover air inlet slot 214 can be provided in the middle area of ​​the inner front cover 212, and a corresponding front cover air inlet hole 213 can be provided on the left and right sides of the outer front cover 211.

[0030] In this embodiment, the front cover air inlet pore 213 and the rear cover air inlet pore 223 are designed with the goal of both allowing air to enter and blocking foreign objects, so that the protective cover kit 20 meets the protection requirements of IP4X protection level. The front cover air inlet pore 213, the front cover air inlet slot 214, the rear cover air inlet slot 224, and the rear cover air inlet pore 223 form the internal heat dissipation channel of the protective cover kit 20, such as... Figure 4 As shown by the arrow, when the cold air flows past the protective cover kit 20 from the front, part of the cold air will pass through the front cover air inlet hole 213 on the outer front cover 211 and enter the area enclosed by the outer front cover 211 and the inner front cover 212. Then it will flow through the front cover air inlet groove 214 on the inner front cover 212 to reach the surface of the terminal 11 and the conductor 50, taking away the heat from the terminal 11 and the conductor 50. Then the hot air carrying the heat will flow through the rear cover air inlet groove 224 on the inner rear cover 222 and enter the area enclosed by the inner rear cover 222 and the outer rear cover 221. Finally, it will flow through the rear cover air inlet hole 223 on the outer rear cover 221 to discharge the hot air, thereby meeting the heat dissipation requirements of the conductor contact surface.

[0031] Furthermore, the front cover assembly 21 and the rear cover assembly 22 of the protective cover adopt a double-layer staggered opening structure. Due to the aperture design of the front cover air inlet 213 and the distance design between the outer front cover 211 and the inner front cover 212, the interference of the hole wall of the front cover air inlet 213 causes the tip of the probe to be unable to reach the front cover air inlet slots 214 on the left and right sides of the inner front cover 212, thus preventing it from bypassing the inner front cover 212 to reach the live parts (including terminals and live parts) inside the protective cover kit 20. Similarly, the probe inserted from the rear cover air inlet 223 also cannot reach the live parts inside the protective cover kit 20, thereby reducing the risk of electric shock during maintenance and greatly increasing the personal safety of maintenance personnel.

[0032] like Figure 3 As shown, in a preferred embodiment of this utility model, an insulating support 60 is provided on the terminal 11. The insulating support 60 can be an insulating column or an insulating block. The inner back cover 222 is fixedly connected to the insulating support 60 by a fastener (such as a fastening screw) 70, and the bottom of the inner back cover 222 abuts against the outer surface of the switching device 10. The cooperation of the inner back cover 222, the insulating support 60, the fastener 70, and the outer surface of the switching device 10 firmly fixes the inner back cover 222, thereby firmly fixing the protective cover back cover assembly 22, and further firmly fixing the entire protective cover kit 20, ensuring that no spatial movement or deformation occurs.

[0033] This utility model also provides a wind power converter, which includes a switch assembly protection structure. The specific structure and working principle of the switch assembly protection structure in the wind power converter are similar to those described above. Figure 2-5 The specific structure and working principle of the switch component protection structure in the illustrated embodiment will not be described in detail here.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Those skilled in the art can make various equivalent changes and improvements based on the above embodiments. All equivalent changes or modifications made within the scope of the claims should fall within the protection scope of the present utility model.

Claims

1. A protective structure for a switch assembly, characterized in that: The device includes a switching device, a protective cover kit, an insulating sleeve, and a conductive component. The switching device includes a terminal connected to the conductive component. The protective cover kit is a non-metallic component that covers the outside of the overlap position between the switching device and the conductive component. The insulating sleeve wraps around the outer surface of the conductive component.

2. The switch assembly protection structure as described in claim 1, characterized in that: The protective cover kit includes a detachably connected front cover assembly and a rear cover assembly, wherein the front cover assembly is connected to the rear cover assembly via a detachable connector to form the protective cover kit.

3. The switch assembly protection structure as described in claim 2, characterized in that: The front cover assembly of the protective cover is provided with a front cover air inlet hole, and the rear cover assembly of the protective cover is provided with a rear cover air inlet hole.

4. The switch assembly protection structure as described in claim 2, characterized in that: The protective cover rear cover assembly includes an outer rear cover and an inner rear cover. The inner rear cover is fixedly connected to the terminal block and has a rear cover air inlet slot. The outer rear cover is fixedly connected to the outside of the inner rear cover and covers the rear cover air inlet slot. The outer rear cover has a rear cover air inlet sealing hole, and the rear cover air inlet sealing hole and the rear cover air inlet slot are spatially staggered. The protective cover front cover assembly includes an outer front cover and an inner front cover. The inner front cover is fixedly connected to the inner rear cover via the detachable connector. The inner front cover has a front cover air inlet slot. The outer front cover is fixedly connected to the outside of the inner front cover and covers the front cover air inlet slot. The outer front cover has a front cover air inlet sealing hole, and the front cover air inlet sealing hole and the front cover air inlet slot are spatially staggered.

5. The switch assembly protection structure as described in claim 4, characterized in that: The inner rear cover has two rear cover air inlet slots, which are located on the left and right sides of the outer side plate of the inner rear cover. The rear cover air inlet hole is located in the middle area of ​​the outer rear cover. The inner front cover has two front cover air inlet slots, which are located on the left and right sides of the inner front cover. The front cover air inlet hole is located in the middle area of ​​the outer front cover.

6. The switch assembly protection structure as described in claim 4, characterized in that: The terminal block is provided with an insulating support, and the inner back cover is fixedly connected to the insulating support by a fastener, and the bottom of the inner back cover abuts against the outer surface of the switching device.

7. The switch assembly protection structure as described in claim 2, characterized in that: The detachable connector is a bolt or snap-fit ​​structure.

8. The switch assembly protection structure as described in any one of claims 1-7, characterized in that: The insulating sleeve is a heat shrink sleeve.

9. A wind power converter, characterized in that: Includes the switch assembly protection structure as described in any one of claims 1-8.

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