Switch protection assembly, control cabinet and wind turbine generator system

Abstract

The application provides a switch protection assembly, a control cabinet and a wind turbine generator set. The switch protection assembly comprises a rotor contactor, a first fuse and a copper bar connecting structure. The rotor contactor is provided with first three-phase connecting terminals. The first fuse is provided with second three-phase connecting terminals. The copper bar connecting structure comprises first three-phase copper bars connected with the first three-phase connecting terminals respectively, second three-phase copper bars connected with the second three-phase connecting terminals respectively and three-phase bridging copper bars connecting the first three-phase copper bars and the second three-phase copper bars respectively. The first three-phase copper bars, the second three-phase copper bars and the three-phase bridging copper bars are arranged in a staggered manner and are separated from each other by a preset distance. The copper bar connecting structure between the contactor and the first fuse is arranged, so that the first three-phase copper bars, the second three-phase copper bars and the three-phase bridging copper bars are arranged in a staggered manner and are separated from each other by a preset distance, thereby ensuring the safety gap between the copper bar connecting structure and achieving the purpose of safe and stable operation.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, specifically to a switch protection component, a control cabinet, and a wind turbine generator set. Background Technology

[0002] The existing installation process of the multi-layer copper busbars at the lower end of the inverter rotor contactor is unreasonable, with the phase-to-phase copper busbars being too close together. Aging and damage to the copper busbar insulation layer can cause phase-to-phase short circuits, leading to heat generation and device burnout, and in severe cases, control cabinet fires. Current countermeasures involve inspecting the multi-layer copper busbars and their insulation, replacing any abnormal ones. However, this approach does not fundamentally solve the problem. Heat generation still occurs due to the deterioration of the insulation capacity of the multi-layer, soft copper busbars, causing damage to the unit. Replacing spare parts has not resolved the underlying issues. Furthermore, the excessively close spacing between phase-to-phase copper busbars, coupled with aging and damage to the insulation layer, can cause phase-to-phase short circuits, resulting in device burnout and, in severe cases, control cabinet fires. The rotor contactor has reached the end of its service life, leading to a high failure rate and power generation loss.

[0003] Therefore, improving the arrangement of the rotor contactor's copper busbars to avoid arcing caused by insufficient phase-to-phase distance has become an urgent technical problem to be solved. Utility Model Content

[0004] The main objective of this disclosure is to provide a switch protection component to solve the problem in the related art where the multilayer copper busbars of the rotor contactor are too close together, and the insulation layer may be damaged, which may lead to short circuits between them and cause the heating device to burn out.

[0005] To achieve the above objectives, a first aspect of this disclosure provides a switch protection assembly, which includes a rotor contactor, a first fuse, and a copper busbar connection structure. The rotor contactor is provided with a first three-phase connection terminal, and the first fuse is provided with a second three-phase connection terminal. The copper busbar connection structure includes a first three-phase copper busbar connected to the first three-phase connection terminal, a second three-phase copper busbar connected to the second three-phase connection terminal, and a three-phase bridging copper busbar connecting the first three-phase copper busbar and the second three-phase copper busbar. The first three-phase copper busbar, the second three-phase copper busbar, and the three-phase bridging copper busbar are staggered and separated from each other by a predetermined distance.

[0006] In some embodiments, the first three-phase copper busbar and the second three-phase copper busbar extend parallel to each other along a first direction and are spaced apart from each other. The three-phase bridging copper busbar extends parallel to each other along a second direction and is spaced apart from each other in the first direction. The three-phase bridging copper busbar connects the copper busbars of the same phase of the first three-phase copper busbar and the second three-phase copper busbar to each other and is spaced apart from the remaining copper busbars in a third direction. The first direction, the second direction and the third direction are perpendicular to each other.

[0007] In some embodiments, the first three-phase copper busbar includes a first connecting segment extending along a first direction and a second connecting segment bent along a third direction relative to the first connecting segment, the second three-phase copper busbar includes a third connecting segment extending along the first direction and a fourth connecting segment bent along a third direction relative to the third connecting segment, and a corresponding bridging copper busbar in the three-phase bridging copper busbar connects the second connecting segment and the fourth connecting segment.

[0008] In some embodiments, the second and fourth connecting segments of the same-phase copper busbar are aligned with each other in the second direction; the second connecting segments of the different-phase copper busbar are staggered in the first direction, and the fourth connecting segments of the different-phase copper busbar are staggered in the first direction.

[0009] In some embodiments, the switch protection assembly further includes a second fuse, which is provided with a third three-phase connection terminal. The copper busbar connection structure further includes a third three-phase copper busbar that is connected to the third three-phase connection terminal and is connected to a three-phase bridging copper busbar.

[0010] In some embodiments, the rotor contactor, the first fuse, and the second fuse are arranged in a triangular pattern, and the third three-phase copper busbar extends along the first direction and is located between the first three-phase copper busbar and the second three-phase copper busbar.

[0011] In some embodiments, each of the third three-phase copper busbars includes a fifth connecting segment extending along a first direction and a sixth connecting segment bent along a third direction relative to the fifth connecting segment, the sixth connecting segment of the third three-phase copper busbar being connected to a corresponding bridging copper busbar in the three-phase bridging copper busbar.

[0012] In some embodiments, the surface of the copper busbar connection structure is covered with a first insulating layer.

[0013] In some embodiments, the first insulating layer is formed on the surface of the copper busbar connection structure by insulating powder coating.

[0014] In some embodiments, the thickness of the first insulating layer is greater than or equal to 60 micrometers and less than or equal to 80 micrometers.

[0015] In some embodiments, the insulation class of the insulation layer includes Class F and Class H.

[0016] In some embodiments, a second insulating layer is further provided outside the first insulating layer, and the second insulating layer is an insulating heat shrink tubing.

[0017] In some embodiments, the distance between adjacent copper busbars in the copper busbar connection structure is greater than or equal to 15 mm.

[0018] In some embodiments, the switch protection assembly further includes an insulating plate, on which the rotor contactor, the first fuse, and the second fuse are all mounted.

[0019] In some embodiments, the switch protection assembly further includes a protective cover covering the outer periphery of the contactor, the first fuse, and the second fuse, and the protective cover is provided with ventilation openings.

[0020] A second aspect of this disclosure provides a control cabinet for a wind turbine generator set, including a switch protection assembly as described in any of the first aspects of this disclosure.

[0021] In some embodiments, the control cabinet is a frequency converter grid-connected cabinet or a power cabinet.

[0022] A third aspect of this disclosure provides a wind turbine generator set, the wind turbine generator set including a control cabinet for the wind turbine generator set as described in any of the second aspect embodiments of this disclosure.

[0023] The switch protection component provided in this embodiment arranges the copper busbar connection structure between the contactor and the first fuse in such a way that the first three-phase copper busbar, the second three-phase copper busbar, and the three-phase bridging copper busbar are staggered and separated from each other by a preset distance. This ensures a safe gap between the copper busbar connection structures and achieves safe and stable operation. In turn, it solves the problem in related technologies where the multi-layer copper busbars of the rotor contactor are too close together, and the insulation layer may be damaged, which may lead to short circuits and burn out the heating devices. Attached Figure Description

[0024] The above and other objects and features of the present invention will become clearer from the following description, taken in conjunction with the accompanying drawings, which exemplarily illustrate an example, wherein: Figure 1 This is a schematic diagram of a switch protection assembly according to an embodiment of the present invention; Figure 2 This is another structural schematic diagram of a switch protection assembly according to one embodiment of the present invention; Figure 3 This is yet another structural schematic diagram of a switch protection assembly according to an embodiment of the present utility model; Figure 4 This is another structural schematic diagram of a switch protection assembly according to an embodiment of the present utility model; Figure 5 This is a structural schematic diagram of a control cabinet according to an embodiment of the present utility model.

[0025] Explanation of reference numerals in the attached figures: 10 Rotor contactor, 110 First three-phase connection terminal, 20 First fuse, 30 Second fuse, 40 Copper busbar connection structure, 410 First three-phase copper busbar, 411 First connecting section, 412 Second connecting section, 420 Second three-phase copper busbar, 421 Third connecting section, 422 Fourth connecting section, 430 Three-phase bridging copper busbar, 440 Third three-phase copper busbar, 441 Fifth connecting section, 442 Sixth connecting section, 50 Insulation board, 60 Protective cover, 610 Ventilation opening, 70 Control cabinet, 710 Metal plate. Detailed Implementation

[0026] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but may be changed as will become clear upon understanding this disclosure, except for operations that must occur in a specific order. Furthermore, for clarity and conciseness, descriptions of features known in the art may be omitted.

[0027] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many feasible ways of implementing the methods, apparatus and / or systems described herein, many of which will become clear upon understanding the disclosure of this application.

[0028] Although terms such as “first” and “second” may be used herein to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts should not be limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teaching of the examples described herein, the first component, first assembly, first region, first layer, or first part referred to as the first component, first assembly, first region, first layer, or first part may also be referred to as the second component, second assembly, second region, second layer, or second part.

[0029] In the specification, when an element such as a layer, region, or substrate is described as being "on" another element, "connected to," or "bonded to" another element, the element may be directly "on" another element, directly "connected to," or "bonded to" the other element, or one or more other elements may be present in between. Conversely, when an element is described as being "directly on" another element, "directly connected to," or "directly bonded to" another element, no other elements may be present in between.

[0030] The terminology used herein is for the purpose of describing various examples only and is not intended to limit disclosure. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the described features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. The term “a plurality” represents any quantity of two or more.

[0031] The directional terms such as "upper," "lower," "top," and "bottom" used in this application are all based on the orientation of the product when it is in normal use.

[0032] Unless otherwise defined, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains after understanding the invention. Unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and in this invention, and shall not be interpreted in an idealized or overly formalistic manner.

[0033] Furthermore, in the description of the examples, detailed descriptions of well-known related structures or functions will be omitted when it is believed that such detailed descriptions would lead to a vague interpretation of the present invention.

[0034] In wind turbine generator sets, the doubly-fed asynchronous generator is one of the mainstream models, especially in medium and large power units. Its structural feature is that the stator is directly connected to the grid, and the rotor is connected to the grid through a converter (frequency converter), which can achieve stable power generation over a wide speed range. The rotor contactor is installed in the circuit between the rotor winding and the converter of the doubly-fed generator, and it is the "switching node" connecting the rotor winding, converter and other auxiliary circuits.

[0035] The rotor contactor of a wind turbine generator is a "key switch" in the rotor circuit of a doubly-fed asynchronous generator. Its core function is to ensure the safe start-up, operation, and fault handling of the unit. During the start-up phase, it enables circuit switching; during normal operation, it ensures a reliable connection between the converter and the rotor; and during faults, it provides emergency isolation protection, ultimately ensuring that the unit efficiently and safely converts wind energy into electrical energy. Its performance directly affects the stability and lifespan of the unit, therefore, the requirements for the contactor's voltage withstand capability, current withstand capability, arc extinguishing capability, and reliability are extremely high.

[0036] The switch protection assembly disclosed herein includes a rotor contactor, a capacitor fuse, and a rotor fuse, and is installed in the rotor-side converter circuit of a doubly-fed asynchronous wind turbine generator. The rotor contactor and rotor fuse are connected in series in the main circuit between the generator rotor and the converter. The crowbar circuit containing the capacitor fuse is connected in parallel with this main circuit. When the main circuit needs protection, the parallel crowbar circuit first trips to "divert" the current. If the situation is more serious, the series-connected rotor contactor disconnects and the fuse blows, providing "circuit break" protection. This multi-layered protection design is crucial to ensuring the safe and reliable operation of such expensive equipment as wind turbine generators under harsh grid conditions.

[0037] The existing installation process for the copper busbar connection structure between the rotor contactor and the rotor fuse and capacitor fuse is unreasonable. The distance between the phase-to-phase copper busbars is too close, and the aging and damage of the copper busbar insulation layer can cause phase-to-phase short circuits, burning out the heating devices, and in severe cases, causing the control cabinet to catch fire. Therefore, this disclosure improves the arrangement of the rotor contactor copper busbars to minimize the arcing problem caused by insufficient phase-to-phase distance, which is an urgent technical problem to be solved.

[0038] The following will combine Figures 1 to 5 This invention introduces a switch protection assembly, a control cabinet 70, and a wind turbine generator set provided by embodiments of the present invention.

[0039] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, a first aspect of this disclosure provides a switch protection assembly, which includes a rotor contactor 10, a first fuse 20, and a copper busbar connection structure 40. The rotor contactor 10 is provided with a first three-phase connection terminal 110, and the first fuse 20 is provided with a second three-phase connection terminal. The copper busbar connection structure 40 includes a first three-phase copper busbar 410 connected to the first three-phase connection terminal 110, a second three-phase copper busbar 420 connected to the second three-phase connection terminal, and a three-phase bridging copper busbar 430 connecting the first three-phase copper busbar 410 and the second three-phase copper busbar 420. The first three-phase copper busbar 410, the second three-phase copper busbar 420, and the three-phase bridging copper busbar 430 are staggered and separated from each other by a predetermined distance.

[0040] The switch protection component provided in this embodiment arranges the copper busbar connection structure 40 between the contactor and the first fuse 20 so that the first three-phase copper busbar 410, the second three-phase copper busbar 420 and the three-phase bridging copper busbar 430 are staggered and separated from each other by a preset distance. This ensures a safe gap between the copper busbar connection structures 40 and achieves safe and stable operation. In this way, it can solve the problem in the related technology that the multi-layer copper busbars connected to the rotor contactor 10 are too close together, and the insulation layer may be damaged, which may cause short circuits and burn out the heating devices.

[0041] It is understood that the first three-phase connection terminal 110, the second three-phase connection terminal and the third three-phase connection terminal all include U-phase, V-phase and W-phase connection terminals, and the terminals of the same phase in the U-phase, V-phase and W-phase connection terminals are connected to each other by copper busbars. For ease of explanation, the copper busbar connected to the U-phase terminal in the first three-phase copper busbar 410 is called the first U-phase copper busbar, the copper busbar connected to the V-phase terminal is called the first V-phase copper busbar, and the copper busbar connected to the W-phase terminal is called the first W-phase copper busbar; the copper busbar connected to the U-phase terminal in the second three-phase copper busbar 420 is called the second U-phase copper busbar, the copper busbar connected to the V-phase terminal is called the second V-phase copper busbar, and the copper busbar connected to the W-phase terminal is called the second W-phase copper busbar; the copper busbar connected to the U-phase terminal in the third three-phase copper busbar 440 is called the third U-phase copper busbar, the copper busbar connected to the V-phase terminal is called the third V-phase copper busbar, and the copper busbar connected to the W-phase terminal is called the third W-phase copper busbar; and the copper busbar connected to the U-phase terminal in the three-phase bridging copper busbar 430 is called the U-phase bridging copper busbar, the copper busbar connected to the V-phase terminal is called the V-phase bridging copper busbar, and the copper busbar connected to the W-phase terminal is called the W-phase bridging copper busbar.

[0042] It is worth noting that, for easier viewing of the attached images, Figure 1 and Figure 2 In the figure, taking the connecting copper busbar between the U-phase terminals as an example, the first three-phase copper busbar 410, the second three-phase copper busbar 420, and the third three-phase copper busbar 440 are labeled. Although the connecting copper busbar between the V-phase and W-phase terminals is not labeled, those skilled in the art can clearly understand the structure and setting position of the first three-phase copper busbar 410, the second three-phase copper busbar 420, and the third three-phase copper busbar 440 from the labeling of the U-phase terminals in the figure.

[0043] It is worth noting that, such as Figure 1 As shown, in the embodiments of this application, the first direction is the vertical direction, that is... Figure 1 The vertical direction of the product is the first direction, and the second direction is the first horizontal direction, that is... Figure 1 The left and right directions of the product are defined as follows: the third direction is the second horizontal direction, which is perpendicular to both the first and second directions. Figure 1 The front and back directions of the product.

[0044] In some embodiments, the first three-phase copper busbar 410 and the second three-phase copper busbar 420 extend parallel to each other along a first direction and are spaced apart from each other, so that multiple copper busbars of the first three-phase copper busbar 410 and multiple copper busbars of the second three-phase copper busbar 420 are all spaced apart by a certain distance. That is, the first U-phase copper busbar, the first V-phase copper busbar, the first W-phase copper busbar, the second U-phase copper busbar, the second V-phase copper busbar, and the second W-phase copper busbar are all spaced apart by a certain distance, thereby ensuring a safe clearance between the copper busbar connection structures 40; the three-phase bridging copper busbar 4 The three-phase bridging copper busbars 430 extend parallel to the second direction and are spaced apart from each other in the first direction, ensuring a certain distance between the multiple copper busbars of the three-phase bridging copper busbars 430. Specifically, the U-phase bridging copper busbars, V-phase bridging copper busbars, and W-phase bridging copper busbars are all spaced apart to guarantee a safety clearance. Furthermore, the three-phase bridging copper busbars 430 connect the same-phase copper busbars of the first three-phase copper busbars 410 and the second three-phase copper busbars 420, and are separated from the remaining copper busbars in the third direction. The first direction, the second direction, and the third direction are perpendicular to each other. This arrangement creates a two-layer structure between the three-phase bridging copper busbars 430 and the first three-phase copper busbars 410 and the second three-phase copper busbars 420 in the third direction, thus forming a three-dimensional structure for the copper busbar connection structure 40. This makes fuller use of space and ensures sufficient distance between the three-phase bridging copper busbars 430 and the first three-phase copper busbars 410 and the second three-phase copper busbars 420, guaranteeing a safety clearance and achieving safe and stable operation.

[0045] In some embodiments, the first three-phase copper busbar 410 includes a first connecting segment 411 extending along a first direction and a second connecting segment 412 bent along a third direction relative to the first connecting segment 411, the second three-phase copper busbar 420 includes a third connecting segment 421 extending along the first direction and a fourth connecting segment 422 bent along a third direction relative to the third connecting segment 421, and a corresponding bridging copper busbar in the three-phase bridging copper busbar 430 connects the second connecting segment 412 and the fourth connecting segment 422.

[0046] In these embodiments, the first connecting segment 411 and the second connecting segment 412 form an L-shaped structure, the third connecting segment 421 and the fourth connecting segment 422 form an L-shaped structure, the two ends of the three-phase bridging copper busbar 430 are respectively connected to the ends of the L-shaped structure and extend along a direction perpendicular to the plane of the L-shaped structure, so that the copper busbar connection structure 40 forms a three-dimensional structure, so that there is sufficient distance between the three-phase bridging copper busbar 430 and the first connecting segment 411 and the third connecting segment 421, thereby ensuring a safe clearance, and the second connecting segment 412 can connect the first connecting segment 411 and the three-phase bridging copper busbar 430.

[0047] In some embodiments, the second connecting segment 412 and the fourth connecting segment 422 of the same phase copper busbar are aligned with each other in the second direction, so that the three-phase bridging copper busbar 430 connecting the second connecting segment 412 and the fourth connecting segment 422 can remain horizontal, which is beneficial to maintaining a certain safe distance between multiple copper busbars of the three-phase bridging copper busbar 430.

[0048] Furthermore, in some embodiments, the second connecting segment 412 of the non-phase copper busbar is staggered in the first direction, and the fourth connecting segment 422 of the non-phase copper busbar is staggered in the first direction. This ensures that there is a certain safe distance between the non-phase copper busbars in the three-phase bridging copper busbar 430.

[0049] In some embodiments, the switch protection assembly further includes a second fuse 30, which is provided with a third three-phase connection terminal. The copper busbar connection structure 40 further includes a third three-phase copper busbar 440 that is connected to the third three-phase connection terminal and is connected to a three-phase bridging copper busbar 430.

[0050] In these embodiments, the switch protection assembly also includes a second fuse 30, which is connected to the three-phase bridging copper busbar 430 via a third three-phase copper busbar 440 to achieve electrical connection between the third three-phase connection terminal and the first three-phase connection terminal 110 and the second three-phase connection terminal; specifically, the third U-phase copper busbar is connected to the U-phase bridging copper busbar, the third V-phase copper busbar is connected to the V-phase bridging copper busbar, and the third W-phase copper busbar is connected to the W-phase bridging copper busbar.

[0051] In some embodiments, the rotor contactor 10, the first fuse 20, and the second fuse 30 are arranged in a triangular pattern, and the third three-phase copper busbar 440 extends along a first direction and is located between the first three-phase copper busbar 410 and the second three-phase copper busbar 420. This arrangement, since the three-phase bridging copper busbar 430 is connected between the first three-phase copper busbar 410 and the second three-phase copper busbar 420, makes it more advantageous to arrange the third three-phase copper busbar 440 between the first three-phase copper busbar 410 and the second three-phase copper busbar 420 to achieve the connection between the third three-phase copper busbar 440 and the three-phase bridging copper busbar 430.

[0052] In one specific embodiment of this application, such as Figures 1 to 5 As shown, the first fuse 20 is located in the upper left, the rotor contactor 10 is located in the upper right, and the second fuse 30 is located in the lower.

[0053] In some embodiments, each of the third three-phase copper busbars 440 includes a fifth connecting segment 441 extending along a first direction and a sixth connecting segment 442 bent along a third third direction relative to the fifth connecting segment 441, wherein the sixth connecting segment 442 of the third three-phase copper busbar 440 is connected to a corresponding bridging copper busbar in the three-phase bridging copper busbar 430.

[0054] In these embodiments, the fifth connecting segment 441 and the sixth connecting segment 442 form an L-shaped structure. The ends of the L-shaped structure are connected to the three-phase bridging copper busbar 430. The three-phase bridging copper busbar 430 extends in a direction perpendicular to the plane of the L-shaped structure, so that the copper busbar connection structure 40 forms a three-dimensional structure. This ensures that there is a sufficient distance between the three-phase bridging copper busbar 430 and the fifth connecting segment 441, thereby guaranteeing a safety clearance. The sixth connecting segment 442 can connect the fifth connecting segment 441 and the three-phase bridging copper busbar 430.

[0055] Furthermore, both the first three-phase copper busbar 410 and the three-phase bridging copper busbar 430 connected to the rotor contactor 10 can be selected with a cross-sectional area of ​​120 mm². 2 -300mm 2 The copper busbar is bent to achieve this; as an example, the cross-sectional area of ​​the copper busbar can be further limited to 240mm². 2 For example, copper busbars with a width-to-thickness ratio of 30mm×8mm or 40mm×6mm can be selected.

[0056] As an example, the first fuse 20 may optionally be a capacitor fuse. Further, optionally, the second three-phase copper busbar 420 connected to the capacitor fuse may be selected with a cross-sectional area of ​​60 mm². 2 -150mm 2 The copper busbar is bent to achieve this; as an example, the cross-sectional area of ​​the copper busbar can be further limited to 100mm². 2 For example, copper busbars with a width-to-thickness ratio of 20mm×5mm or 25mm×4mm can be selected.

[0057] As an example, the second fuse 30 may optionally be a rotor fuse. Further, optionally, the third three-phase copper busbar 440 connected to the rotor fuse may have a cross-sectional area of ​​120 mm². 2 -300mm 2 The copper busbar is bent to achieve this; as an example, the cross-sectional area of ​​the copper busbar can be further limited to 240mm². 2 For example, copper busbars with a width-to-thickness ratio of 30mm×8mm or 40mm×6mm can be selected.

[0058] It is worth noting that, since the current of the capacitor fuse is relatively small, and the distance between the multiple second and third phase connection terminals of the capacitor fuse is also relatively small, the connection of the capacitor fuse can be achieved by using a copper busbar with a relatively small cross-sectional area compared to the rotor fuse and the copper busbar connected at the rotor contactor 10.

[0059] Understandably, the choice of the width-to-thickness ratio of copper busbars depends on current carrying capacity and heat dissipation. Under the same cross-sectional area, a wider and thinner copper busbar has better heat dissipation performance than a narrower and thicker copper busbar, so the actual current carrying capacity is usually higher. Of course, in actual selection, the installation space and the spacing between copper busbars must also be considered.

[0060] In some embodiments, the surface of the copper busbar connection structure 40 is covered with a first insulating layer. The first insulating layer enables the copper busbars of the copper busbar connection structure 40 to insulate each other, and can form a double layer of protection after being staggered and spaced apart by a preset distance from each other. This further solves the problem in the related art that when the multiple copper busbars connected by the rotor contactor 10 are too close together, the insulation layer may be damaged, which may cause short circuits and burn out the heating devices, thus reducing the risk of fire in the unit.

[0061] Furthermore, the first insulation layer is formed on the surface of the copper busbar connection structure 40 by insulating powder coating. Copper busbar insulating powder coating is a special technology that uses specialized processes and equipment to uniformly coat the copper busbar with powder coating. After curing (or plasticizing), a smooth, flat, and robust insulating protective layer is formed on the copper busbar. This protective layer not only maintains the original strength and rigidity of the copper busbar but also possesses excellent corrosion resistance and wear resistance, thus significantly extending the service life of the copper busbar. At the same time, this powder coating process does not pollute the environment, is non-toxic to humans, and is simple to apply with low skill requirements for workers.

[0062] Furthermore, in some embodiments, the thickness of the first insulating layer is greater than or equal to 60 micrometers and less than or equal to 80 micrometers. Within this range, reliable insulation performance can be ensured while avoiding waste of powder coating material due to excessive thickness of the first insulating layer. According to standard GB / T18593-2010 "Anti-corrosion Coating of Fusion-bonded Epoxy Powder Coatings", the thickness of the powder coating layer should be in the range of 60 to 80 micrometers, and it is applied to 1kV AC voltage with a withstand voltage test voltage of 2.5kV.

[0063] In some embodiments, the insulation class of the insulation layer includes F and H. Due to the exceptionally harsh operating conditions of wind turbine generators and the drastic temperature variations in the operating environment, higher-grade insulation materials not only have better heat resistance, but also generally superior mechanical strength, corona resistance, chemical corrosion resistance, and adhesion compared to lower-grade materials. This allows them to better resist vibration, voltage surges, and humid environments, comprehensively improving reliability. Wind turbine generators typically use F and H insulation classes, not primarily for high-temperature operation, but to provide a large temperature and safety margin for the generator under extremely harsh and variable operating conditions, ensuring its extended design life and extremely high operational reliability, thereby reducing total life-cycle maintenance costs.

[0064] In some embodiments, a second insulating layer is further provided outside the first insulating layer, and the second insulating layer is an insulating heat shrink tubing. The insulating heat shrink tubing can tightly wrap around the copper busbar after being heated and shrunk. The insulating heat shrink tubing is mostly made of polyolefin, cross-linked polyethylene, etc., and its breakdown voltage is typically above 15kV / mm, exhibiting excellent insulation performance. Furthermore, it requires no complex tools; it can be quickly shrunk and formed using heating equipment such as a hot air gun or oven (temperature typically between 100℃ and 160℃), resulting in fast bonding and high installation efficiency.

[0065] In some embodiments, the distance between adjacent copper busbars in the copper busbar connection structure 40 is greater than or equal to 15 mm. This ensures electrical safety and prevents breakdown and short circuits. Air itself is an insulating medium, but its insulating capacity is limited. When two conductors with a potential difference are too close, the air between them may be ionized and break down, generating an electric arc, causing a phase-to-phase short circuit or a short circuit to ground. A 15 mm air gap provides sufficient safety margin in low-voltage systems to withstand transient overvoltages that may occur in the system (such as operational overvoltages and lightning-induced overvoltages), thereby effectively preventing accidental discharge. In addition, the IEC 60269-1 standard specifies the safety requirements for electrical equipment of 1000V and below, including requirements for electrical clearances. According to this standard, the creepage distance and electrical clearance for 1000V electrical equipment should not be less than 15 mm. It is worth noting that the IEC 60269-1 standard refers to completely exposed metal. In the embodiments of this disclosure, insulating powder coating is applied to the surface of the copper busbars for double protection, and the safe distance between copper plates and between copper plates and the cabinet is not less than 15 mm, which further ensures electrical safety.

[0066] In some embodiments, the switch protection assembly further includes an insulating plate 50, on which the rotor contactor 10, the first fuse 20, and the second fuse 30 are all mounted. The switch protection assembly is typically installed in a control cabinet 70, for example, on the back panel, side panel, or internal partition of the control cabinet 70. The control cabinet 70 is generally made of a metal plate 710. The insulating plate 50 provides overall isolation and insulation between the contactor, the first fuse 20, the second fuse 30, and the copper busbar connection structure 40 connecting the three, and the metal plate 710. Optionally, the insulating plate 50 may be a 3mm thick plastic insulating plate.

[0067] In some embodiments, the switch protection assembly further includes a protective cover 60, which covers the outer periphery of the contactor, the first fuse 20, and the second fuse 30. With this configuration, the protective cover 60 can be fixed to the insulating plate 50 or the control cabinet 70, and covers the contactor, the first fuse 20, and the second fuse 30, thereby providing external protection for the contactor, the first fuse 20, the second fuse 30, and the copper busbar connection structure 40 connecting the three, preventing accidental activation and improving safety.

[0068] Further, as an example, optionally, the protective cover 60 has a wall that encloses to form a receiving cavity, and the side of the protective cover 60 facing the insulating plate 50 has an opening, through which the rotor contactor 10, the first fuse 20, and the second fuse 30 enter the receiving cavity.

[0069] Furthermore, the protective cover 60 is provided with a vent 610. The vent 610 can exchange air and heat between the inside and outside of the protective cover 60, so as not to affect the heat dissipation of the internal components of the protective cover 60, and to avoid heat accumulation inside the protective cover 60 causing the temperature to be too high, thereby affecting the life of the internal components.

[0070] Further, as an example, the vent 610 may optionally be a plurality of through holes disposed on and penetrating the protective cover 60; or, the vent 610 may be a notch formed on at least one of the top wall, bottom wall, left side wall, and right side wall of the protective cover 60.

[0071] Furthermore, as an example, the protective cover 60 may optionally be made of PC plastic or other insulating plastic.

[0072] A second aspect of this disclosure provides a control cabinet 70 for a wind turbine generator set, including a switch protection assembly as described in any of the first aspects of this disclosure.

[0073] The control cabinet 70 of the wind turbine generator provided in this embodiment has all the beneficial effects of the switch protection component provided in any embodiment of the first aspect, which will not be listed one by one here.

[0074] In some embodiments, the control cabinet 70 is a frequency converter grid-connected cabinet or a power cabinet. The switch protection components can be installed on the side panel or back panel of the control cabinet 70, or the control cabinet 70 can be equipped with partitions to separate the internal space, with the switch protection components installed on the partitions. As an example, optionally, the side panel, back panel, and partitions of the control cabinet 70 are all metal plates 710.

[0075] A third aspect of this disclosure provides a wind turbine generator set, the wind turbine generator set including a control cabinet 70 for the wind turbine generator set as described in any of the second aspect embodiments of this disclosure.

[0076] The wind turbine generator set provided in this embodiment has all the beneficial effects of the control cabinet 70 provided in any embodiment of the second aspect, which will not be listed here.

[0077] While the embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope thereof. It should be understood that, to those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention as defined in the claims.

Claims

1. A switch protection component, characterized in that, The switch protection assembly includes a rotor contactor (10), a first fuse (20), and a copper busbar connection structure (40). The rotor contactor (10) is provided with a first three-phase connection terminal (110), the first fuse (20) is provided with a second three-phase connection terminal, and the copper busbar connection structure (40) includes a first three-phase copper busbar (410) connected to the first three-phase connection terminal (110), a second three-phase copper busbar (420) connected to the second three-phase connection terminal, and a three-phase bridging copper busbar (430) connecting the first three-phase copper busbar (410) and the second three-phase copper busbar (420). The first three-phase copper busbar (410), the second three-phase copper busbar (420) and the three-phase bridging copper busbar (430) are staggered and separated from each other by a preset distance.

2. The switch protection assembly according to claim 1, characterized in that, The first three-phase copper busbar (410) and the second three-phase copper busbar (420) extend parallel to each other along a first direction and are spaced apart from each other. The three-phase bridging copper busbar (430) extends parallel to each other along a second direction and is spaced apart from each other in the first direction. The three-phase bridging copper busbar (430) connects the copper busbars of the same phase of the first three-phase copper busbar (410) and the second three-phase copper busbar (420) to each other and is spaced apart from the remaining copper busbars in a third direction. The first direction, the second direction and the third direction are perpendicular to each other.

3. The switch protection assembly according to claim 2, characterized in that, The first three-phase copper busbar (410) includes a first connecting segment (411) extending along a first direction and a second connecting segment (412) bent along a third direction relative to the first connecting segment (411). The second three-phase copper busbar (420) includes a third connecting segment (421) extending along a first direction and a fourth connecting segment (422) bent along a third direction relative to the third connecting segment (421). A corresponding bridging copper busbar in the three-phase bridging copper busbar (430) connects the second connecting segment (412) and the fourth connecting segment (422).

4. The switch protection assembly according to claim 3, characterized in that, The second connecting segment (412) and the fourth connecting segment (422) of the same phase copper busbar are aligned with each other in the second direction; The second connecting segment (412) of the heterogeneous copper busbar is staggered in the first direction, and the fourth connecting segment (422) of the heterogeneous copper busbar is staggered in the first direction.

5. The switch protection assembly according to claim 4, characterized in that, The switch protection assembly also includes a second fuse (30), on which a third three-phase connection terminal is provided. The copper busbar connection structure (40) also includes a third three-phase copper busbar (440) that is connected to the third three-phase connection terminal. The third three-phase copper busbar (440) is connected to the three-phase bridging copper busbar (430) respectively.

6. The switch protection assembly according to claim 5, characterized in that, The rotor contactor (10), the first fuse (20) and the second fuse (30) are arranged in a triangular pattern, and the third three-phase copper busbar (440) extends along the first direction and is located between the first three-phase copper busbar (410) and the second three-phase copper busbar (420).

7. The switch protection assembly according to claim 6, characterized in that, Each of the third three-phase copper busbars (440) includes a fifth connecting segment (441) extending along a first direction and a sixth connecting segment (442) bent along a third direction relative to the fifth connecting segment (441), the sixth connecting segment (442) of the third three-phase copper busbar (440) being connected to a corresponding bridging copper busbar in the three-phase bridging copper busbar (430).

8. The switch protection assembly according to claim 7, characterized in that, The surface of the copper busbar connection structure (40) is covered with a first insulating layer.

9. The switch protection assembly according to claim 8, characterized in that, The first insulating layer is formed on the surface of the copper busbar connection structure (40) by insulating powder coating.

10. The switch protection assembly according to claim 9, characterized in that, The thickness of the first insulating layer is greater than or equal to 60 micrometers and less than or equal to 80 micrometers; and / or The insulation class of the insulation layer includes F and H.

11. The switch protection assembly according to claim 8, characterized in that, A second insulating layer is provided on the outside of the first insulating layer, and the second insulating layer is an insulating heat shrink tubing.

12. The switch protection assembly according to any one of claims 1-11, characterized in that, The distance between adjacent copper busbars in the copper busbar connection structure (40) is greater than or equal to 15 mm.

13. The switch protection assembly according to any one of claims 5-11, characterized in that, The switch protection component also includes: An insulating plate (50) is mounted on which the rotor contactor (10), the first fuse (20), and the second fuse (30) are all mounted; and / or A protective cover (60) is provided on the outer periphery of the rotor contactor (10), the first fuse (20) and the second fuse (30), and a vent (610) is provided on the protective cover (60).

14. A control cabinet, characterized in that, The control cabinet includes a switch protection assembly as described in any one of claims 1-13.

15. The control cabinet according to claim 14, characterized in that, The control cabinet (70) is a frequency converter grid-connected cabinet or a power cabinet.

16. A wind turbine generator set, characterized in that, The wind turbine generator set includes the control cabinet as described in claim 14 or 15.

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