A protection device for wind power lightning protection

Abstract

The utility model provides a kind of protection device for wind power lightning protection, the device includes: shell, first conducting part and second conducting part are arranged inside, and its both ends opening are encapsulated by epoxy casting layer;The voltage-dependent resistor component includes at least one voltage-dependent resistor disc connected in series using pressing mode;The capacitor component includes at least one capacitor chip connected in series using pressing mode;Switching type lightning protection component includes two oppositely arranged and gap existing conductive balls;Voltage equalizing ball is arranged at one end outside shell, and is connected with first conducting part by first conducting rod;Base is arranged at the other end outside shell, and is connected with second conducting part by second conducting rod.The utility model is connected in parallel by setting voltage-dependent resistor, capacitor, switching type lightning protection component, realizes multistage voltage suppression and energy discharge, effectively improves withstand voltage grade, greatly improves protection level, and can adapt to multiple application scenarios.

Description

Technical Field

[0001] This utility model relates to the field of lightning protection technology for wind power equipment, and specifically to a protective device for wind power lightning protection. Background Technology

[0002] Offshore wind power is a core development direction of clean energy. Its operating environment is characterized by high salt spray, high humidity, strong corrosion, and frequent lightning activity. Among these, lightning damage has become a key bottleneck restricting the reliable operation of offshore wind turbine generators.

[0003] Current lightning protection devices used in offshore wind turbines typically involve parallel connection of varistors and capacitor chips via welding. This design has a low withstand voltage rating and poor protection performance. Furthermore, the welding method is unsuitable for the diverse lightning conditions at sea, and welding in series, or welding a single component in series, further reduces the overall withstand voltage rating of the lightning protection device. The welding process can also cause damage to the chips and electrodes due to thermal stress, resulting in low lightning protection and susceptibility to breakdown. In addition, the varistor voltage and capacitance of the entire lightning protection device are not adjustable, the withstand voltage rating is uncontrollable, and it cannot adapt to various application scenarios.

[0004] It should be noted that this section is intended to provide background or context for the embodiments of this disclosure set forth in the claims. The description herein does not constitute an admission that it is prior art simply because it is included in this section. Utility Model Content

[0005] This utility model provides a protective device for wind power lightning protection, which solves the problems of low withstand voltage level, low protection performance and inability to adapt to various application scenarios in existing lightning protection equipment.

[0006] This utility model embodiment provides a wind power lightning protection device, which includes:

[0007] The housing has a first conductive element and a second conductive element inside, and its two ends are encapsulated by an epoxy casting layer.

[0008] A varistor assembly includes at least one varistor sheet connected in series by a pressing method, with its two ends respectively threadedly connected to the first conductive element and the second conductive element by a first spring;

[0009] A capacitor assembly includes at least one capacitor chip connected in series by a pressing method, with its two ends threadedly connected to the first conductor and the second conductor respectively by a second spring;

[0010] A switch-type surge protection assembly includes two conductive balls arranged opposite each other with a gap, the conductive balls being threadedly connected to the first conductive element and the second conductive element respectively via a third spring;

[0011] A pressure equalizing ball is disposed at one end of the outer side of the housing and is connected to the first conductive element through a first conductive rod;

[0012] The base is located at the other end of the outer side of the housing and is connected to the second conductive member via the second conductive rod.

[0013] As a preferred embodiment of this invention, the shell is filled with quartz sand.

[0014] As a preferred embodiment of this utility model, both the varistor assembly and the capacitor assembly are provided with an epoxy material coating layer on their outer sides.

[0015] As a preferred embodiment of this utility model, at least one insulating sleeve is provided on the outer side of the end of the housing near the base and on the outer side of the second conductive member.

[0016] As a preferred embodiment of this utility model, the base is provided with at least one mounting hole.

[0017] This utility model provides a wind power lightning protection device. By setting a parallel structure of a varistor, capacitor, and switch-type lightning protection component, it achieves multi-level voltage suppression and energy dissipation, effectively improving the withstand voltage level and significantly enhancing the protection level. Simultaneously, the varistor and capacitor chips are connected in series using a pressing method, replacing the traditional welding method. This effectively avoids thermal stress damage caused by welding, greatly improving current carrying capacity and withstand voltage. Furthermore, it allows for adjustable varistor voltage and capacitance, adapting to various application scenarios. The gap between the conductive balls in the switch-type lightning protection component is adjustable, accommodating different withstand voltage requirements in various scenarios and achieving controllable withstand voltage.

[0018] This device significantly improves the protection level, has high stability, and a wide protection range, effectively reducing the probability of lightning damage to wind turbines and extending the service life of the units. It is suitable not only for the lightning protection needs of offshore wind turbines but also for the lightning protection needs of onshore wind turbines. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A three-dimensional structural schematic diagram of the wind power lightning protection device provided in the embodiments of this utility model;

[0021] Figure 2A schematic diagram of the main structure of the wind power lightning protection device provided in this embodiment of the utility model;

[0022] Figure 3 A schematic diagram of the internal structure of the wind power lightning protection device provided in this embodiment of the utility model.

[0023] in:

[0024] 10. Housing; 11. First conductive element; 12. Second conductive element; 13. Epoxy casting layer; 14. Quartz sand;

[0025] 21. Varistor sheet; 22. First spring;

[0026] 31. Capacitor chip; 32. Second spring;

[0027] 41. Conductive ball; 42. Third spring;

[0028] 50. Equalizing ball; 51. First conductor rod;

[0029] 60. Base; 61. Second guide rod; 62. Mounting hole;

[0030] 70. Insulating sleeve. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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 should fall within the protection scope of the present invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] The following is for reference Figures 1-3 As shown, the specific structure of the wind power lightning protection device provided in this embodiment of the utility model is described in detail.

[0034] The wind power lightning protection device provided in this embodiment mainly includes a housing 10. Inside the housing 10, a varistor assembly, a capacitor assembly, and a switch-type lightning protection assembly are connected in parallel. At the two ends of the housing 10, an equalizing ball 50 and a base 60 are respectively installed. This device adopts a parallel structure of the varistor assembly, capacitor assembly, and switch-type lightning protection assembly. The varistor assembly can quickly respond to lightning overvoltage and clamp the voltage amplitude, suppressing induced lightning impacts. The capacitor assembly works in conjunction with the varistor assembly to filter out high-frequency oscillations and reduce residual voltage hazards. The switch-type lightning protection assembly breaks down and discharges energy when the lightning current is too large, protecting the varistor assembly from burnout. The three components connected in parallel form a multi-stage energy discharge and voltage suppression structure, greatly improving the withstand voltage level. The maximum discharge current is 8 / 20μs (Imax) 300kA, and the impulse current is 10 / 350μs (Iimp) 25kA, significantly improving the protection performance.

[0035] Specifically, the housing 10 is a hollow structure with openings at both ends, and it is made of metal. Inside the housing 10 are a first conductive element 11 and a second conductive element 12. After the components inside the housing are installed, the openings at both ends are epoxy coated to form an epoxy casting layer 13, improving overall insulation performance and structural stability. Both the first conductive element 11 and the second conductive element 12 are made of metal and can be sheet-like or ring-shaped, with multiple threaded holes for connecting to the varistor assembly, capacitor assembly, and switch-type surge protection assembly, respectively.

[0036] The varistor assembly includes at least one varistor element 21 connected in series by a pressing method. The two ends of the series-connected varistor element 21 are respectively threaded to a first conductive element 11 and a second conductive element 12 via a threaded first spring 22. In this embodiment, a varistor element adapted to wind power conditions is selected to ensure fast response and strong current carrying capacity. The first spring is a high-voltage adapted spring with threaded ends. During installation, the pressing force of the first spring is used to tightly connect and fix multiple varistor elements in series, avoiding thermal stress damage caused by traditional welding. Simultaneously, the number of series-connected varistor elements can be adjusted according to the target varistor voltage requirement, and the varistor voltage adjustment is verified through withstand voltage testing to ensure accurate adjustment.

[0037] By replacing the traditional welding method with a high-voltage spring pressing method, thermal stress damage caused by welding of the varistor sheet and electrodes is effectively avoided, the current carrying capacity is greatly improved, and the varistor voltage can be adjusted to adapt to a variety of application scenarios.

[0038] The capacitor assembly includes at least one capacitor chip 31 connected in series by a pressing method. The two ends of the series-connected capacitor chip 31 are threadedly connected to the first conductive element 11 and the second conductive element 12 via a threaded second spring 32. In this embodiment, a high-voltage ceramic capacitor chip is selected to ensure charge storage and neutralization capabilities. Similarly, a high-voltage adapter spring with threaded ends is selected for the second spring. During installation, the pressing force of the second spring tightly secures the multiple capacitor chips in series, avoiding thermal stress damage caused by traditional welding. Simultaneously, the number of capacitor chips connected in series can be adjusted according to the required capacitance and voltage rating, and the insulation performance and charge storage capacity of the capacitor assembly can be tested to ensure that functional requirements are met.

[0039] By replacing the traditional welding method with a high-pressure spring pressing method, thermal stress damage caused by welding capacitor chips and electrodes is effectively avoided, greatly improving the withstand voltage. Moreover, the capacitance and withstand voltage level can be adjusted, making it suitable for a variety of application scenarios.

[0040] The switch-type surge protector includes two opposing conductive balls 41 with a gap between them. These two conductive balls 41 are respectively threadedly connected to the first conductive element 11 and the second conductive element 12 via a threaded third spring 42. In this embodiment, the third spring is also a high-voltage adaptable spring with threads at its end. During installation, the air gap between the conductive balls can be precisely adjusted by rotating the threads at the end of the third spring. The larger the gap, the higher the withstand voltage rating, thus adapting to the withstand voltage requirements of different lightning conditions.

[0041] By adopting an adjustable structure consisting of a spring and a conductive ball gap, it can adapt to different pressure resistance requirements in various scenarios and achieve controllable pressure resistance.

[0042] An equalizing sphere 50 is disposed at one end outside the housing 10, and is connected to a first conductive rod 51. The first conductive rod 51 passes through the epoxy casting layer 13 at that end of the housing 10 and connects to a first conductive element 11 inside the housing 10. The equalizing sphere 50 can both attract lightning and improve the electric field distribution of the device. The smooth characteristics of the spherical surface prevent excessively high local electric field strength, thereby suppressing corona discharge, reducing the risk of insulation breakdown, and ensuring the stable operation of the entire high-voltage equipment.

[0043] The base 60 is located at the other end of the outer shell 10 and is connected to a second conductive rod 61. This second conductive rod 61 passes through the epoxy casting layer 13 at that end of the shell 10 and connects to a second conductive element 12. The second conductive rod 12 ensures that lightning current is quickly discharged into the ground, while the base 60 adapts to the complex installation requirements of wind power projects, providing comprehensive lightning protection. The base 60 is provided with at least one mounting hole 62 to meet the installation requirements under complex conditions.

[0044] When lightning strikes a point on a wind turbine, the energy generated is enormous and can have serious consequences for the unit. After installing this device on the wind turbine, the lightning is first drawn to the equalizing sphere, which equalizes the lightning voltage, effectively splitting the lightning strike into multiple smaller strikes, thus reducing the lightning voltage. The charge stored in the capacitor assembly then neutralizes these lightning strikes, further lowering the lightning voltage and reducing its energy. The excess lightning voltage is then divided by the switch-type surge protection component and the varistor component, and introduced into the base through the second conductive element below, finally flowing to the ground through the base, thus achieving the function of lightning protection and suppression.

[0045] Preferably, both the varistor assembly and the capacitor assembly are coated with an epoxy material layer. During manufacturing, the varistor assembly and capacitor assembly are preheated, then a layer of solid epoxy powder is applied, followed by reheating to melt the powder, and finally, after cooling, it solidifies into an epoxy material coating layer. This epoxy material coating layer effectively provides corrosion and salt spray protection.

[0046] Preferably, the voids inside the shell 10 are filled with quartz sand 14, preferably high-purity quartz sand of 80-150 mesh. Because quartz sand 14 has high thermal conductivity, it promotes heat transfer and conduction, and also has good flame retardancy, effectively solving the problem of flashover of internal components caused by high-current lightning strikes. At the same time, it improves the insulation performance and bonding performance with the chip, and further improves the withstand voltage and partial discharge performance. For the same capacitor chip, the traditional casting method achieves a partial discharge of less than 5pc at 14.4kV, while using quartz sand filling can achieve 24kV with no partial discharge. In actual manufacturing, quartz sand can be mixed with epoxy materials and curing agents. During the filling process, it is ensured that the quartz sand is evenly distributed without voids, achieving multiple effects of thermal conductivity, flame retardancy, and flashover prevention.

[0047] Furthermore, at least one insulating sleeve 70 is provided on the outer side of the end of the housing 10 near the base 60 and on the outer side of the second conductive member 61. The insulating sleeve has an umbrella-shaped structure and is made of insulating material. It can optimize the distribution of the external electric field of the device, extend the creepage distance, avoid insulation breakdown in the event of lightning strikes or in humid environments, and also play a role in preventing salt spray and moisture, making it suitable for the complex operating conditions of wind power.

[0048] In summary, this utility model provides a wind power lightning protection device. By setting up a parallel structure of a varistor, a capacitor, and a switch-type lightning protection component, it achieves multi-level voltage suppression and energy dissipation, effectively improving the withstand voltage level and significantly enhancing the protection level. Simultaneously, the varistor and capacitor chips are connected in series using a pressing method, replacing the traditional welding method. This effectively avoids thermal stress damage caused by welding, greatly improving current carrying capacity and withstand voltage. Furthermore, it allows for adjustable varistor voltage and capacitance, adapting to various application scenarios. The adjustable gap between the conductive balls in the switch-type lightning protection component can accommodate different withstand voltage requirements in various scenarios, achieving controllable withstand voltage.

[0049] This device significantly improves the protection level, has high stability, and a wide protection range, effectively reducing the probability of lightning damage to wind turbines and extending the service life of the units. It is suitable not only for the lightning protection needs of offshore wind turbines but also for the lightning protection needs of onshore wind turbines.

[0050] In the above embodiments of this utility model, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A protective device for wind power lightning protection, characterized in that, The device includes: The housing has a first conductive element and a second conductive element inside, and its two ends are encapsulated by an epoxy casting layer. A varistor assembly includes at least one varistor sheet connected in series by a pressing method, with its two ends respectively threadedly connected to the first conductive element and the second conductive element by a first spring; A capacitor assembly includes at least one capacitor chip connected in series by a pressing method, with its two ends threadedly connected to the first conductor and the second conductor respectively by a second spring; A switch-type surge protection assembly includes two conductive balls arranged opposite each other with a gap, the conductive balls being threadedly connected to the first conductive element and the second conductive element respectively via a third spring; A pressure equalizing ball is disposed at one end of the outer side of the housing and is connected to the first conductive element through a first conductive rod; The base is located at the other end of the outer side of the housing and is connected to the second conductive member via the second conductive rod.

2. The apparatus according to claim 1, characterized in that, The shell is filled with quartz sand.

3. The apparatus according to claim 1, characterized in that, Both the varistor assembly and the capacitor assembly have an epoxy material coating layer on their outer sides.

4. The apparatus according to claim 1, characterized in that, At least one insulating sleeve is provided on the outer side of the end of the housing near the base and on the outer side of the second conductive element.

5. The apparatus according to any one of claims 1 to 4, characterized in that, The base has at least one mounting hole.

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