CN216649360U - Stator bar, stator and generator - Google Patents

Abstract

The embodiment of the application discloses a stator bar, a stator and a generator. The stator winding bar comprises a winding bar body, a main insulating layer, a first anti-corona layer and a second anti-corona layer, wherein the winding bar body is provided with a groove part area and an end part area; the second anti-corona layer is coated at the position corresponding to the end part area on the main insulating layer, and the resistivity of the second anti-corona layer is greater than that of the first anti-corona layer; the edge of the second anti-corona layer is partially overlapped with the edge of the first anti-corona layer to form an overlapping area. This application is through setting up first anticorona layer into the first sub-anticorona layer and the sub-anticorona layer of second of range upon range of setting, makes the regional binary channels structure that forms of slot part of line stick body, reduces the surface resistivity on the regional anticorona layer of slot part, avoids line stick body slot part region to appear the partial discharge phenomenon.

Description

Stator bar, stator and generator

Technical Field

The application relates to the technical field of generators, in particular to a stator bar, a stator and a generator.

Background

Potential distribution of the outlet region of the generator stator bar is complex and thermal stress is concentrated, and leakage current and capacitance current at the end part of the stator bar are converged to the groove region of the stator bar and then reach the stator core grounding part. Along with the improvement of the rated voltage grade of the unit, the current generated at the end part of the stator bar is increased, and the heating loss generated in the notch area of the stator bar is also greatly increased; meanwhile, after the motor runs for a long time, the phenomenon of damaging an anti-corona layer in a stator bar slot part area exists in abrasion or shutdown maintenance and cleaning in the running process, the anti-corona layer generates more heating loss due to the current flowing through the stator bar slot part area, the anti-corona capacity of the anti-corona layer in the outlet area of the stator bar slot part is further reduced, and the partial discharge phenomenon occurs in the slot part area.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a stator bar, a stator and a generator, and can solve the problem that partial discharge easily occurs in the groove part area of the existing stator bar.

Embodiments of the present application provide a stator bar comprising:

a bar body having a groove region and an end region connected in sequence along an extension direction of the bar body;

the main insulating layer is coated on the surface of the wire rod body;

the first anti-corona layer is coated on the main insulating layer at the position corresponding to the groove part area; the first anti-corona layer comprises a first sub-anti-corona layer and a second sub-anti-corona layer which are arranged in a stacked mode;

the second anti-corona layer is coated on the main insulating layer at a position corresponding to the end part area; the resistivity of the second anti-corona layer is greater than the resistivity of the first anti-corona layer;

the edge of the second anti-corona layer is partially overlapped with the edge of the first anti-corona layer to form an overlapping area; the lap joint region comprises the first sub corona-proof layer, the second sub corona-proof layer and the second corona-proof layer which are arranged in a stacked mode.

Optionally, in some embodiments of the present application, the lap joint region includes the first sub corona-preventing layer, the second sub corona-preventing layer, and the second corona-preventing layer, which are sequentially disposed in a direction away from the main insulating layer; or the like, or, alternatively,

the lap joint region comprises the first sub anti-corona layer, the second anti-corona layer and the second sub anti-corona layer which are sequentially arranged along the direction far away from the main insulating layer.

Optionally, in some embodiments of the present application, the second sub corona prevention layer covers the first sub corona prevention layer; the resistivity of the second sub corona prevention layer is smaller than that of the first sub corona prevention layer.

Optionally, in some embodiments of the present application, the thickness of the first sub anti-corona layer is greater than or equal to 0.06mm and less than or equal to 0.12 mm; the thickness of the second sub anti-corona layer is greater than or equal to 0.06mm and less than or equal to 0.12 mm.

Optionally, in some embodiments of the present application, the length of the first sub corona prevention layer in the extension direction of the bar body is greater than or equal to 120mm and less than or equal to 180 mm; the length of the overlapping area along the extending direction of the bar body is greater than or equal to 15mm and less than or equal to 25 mm.

Optionally, in some embodiments of the present application, the second anti-corona layer includes a first anti-corona section, a second anti-corona section, and a third anti-corona section, which are sequentially overlapped along a region away from the groove portion; the first anti-corona section edge is partially overlapped with the first anti-corona layer edge to form the overlapping area.

Optionally, in some embodiments of the present application, the resistivities of the first corona prevention section, the second corona prevention section, and the third corona prevention section are sequentially increased.

Optionally, in some embodiments of the present application, the stator bar further comprises:

the first protective layer is coated on the second anti-corona layer;

the second protective layer is coated on the first anti-corona layer;

and the third protective layer is coated on the first protective layer.

Accordingly, embodiments of the present application also provide a stator including a stator bar as described in any of the above.

Correspondingly, the embodiment of the application also provides a generator, and the generator comprises the stator.

The stator bar comprises a bar body, a main insulating layer, a first anti-corona layer and a second anti-corona layer, wherein the bar body is provided with a groove part area and an end part area; the second anti-corona layer is coated at the position of the corresponding end part area on the main insulating layer, and the resistivity of the second anti-corona layer is greater than that of the first anti-corona layer; the edge of the second corona-proof layer is partially overlapped with the edge of the first corona-proof layer to form an overlapping area, and the overlapping area comprises a first sub corona-proof layer, a second sub corona-proof layer and a second corona-proof layer which are arranged in a stacked mode. This application is through setting up first anticorona layer into the first sub-anticorona layer and the sub-anticorona layer of second of range upon range of setting, makes the regional binary channels structure that forms of slot part of line stick body, reduces the surface resistivity on the regional anticorona layer of slot part, avoids line stick body slot part region to appear the partial discharge phenomenon.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of a stator bar provided by an embodiment of the present application;

fig. 2 is a schematic structural view of another stator bar provided by the embodiment of the application.

Description of reference numerals:

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless indicated to the contrary, the use of the directional terms "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, and more particularly to the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.

The embodiment of the application provides a stator bar, a stator and a generator. The following are detailed below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments.

First, the present embodiment provides a stator bar, as shown in fig. 1 and 2, the stator bar 100 includes a bar body 110, the bar body 110 has a slot section S1 and an end section S2 connected in sequence along the extension direction of the bar body 110, wherein the slot section S1 of the bar body 110 is used for connecting with a stator core, and the stator core and the stator bar 100 jointly form a stator structure in a generator; the end region S2 of the bar body 110 is then used to connect with other routing structures.

The stator bar 100 comprises a main insulating layer 120, and the main insulating layer 120 covers the surface of the bar body 110 to insulate the stator bar 100, so that the mutual interference between two adjacent stator bars 100 in the generator is avoided, and the normal operation of the generator is prevented from being influenced.

The stator bar 100 includes a first anti-corona layer 130, the first anti-corona layer 130 being coated on the main insulation layer 120 at a location corresponding to the slot region S1. During use of the stator bar 100, the slot region S1 of the bar body 110, particularly the exit slot region, has a complex potential distribution and a concentrated thermal stress, and is a high-occurrence region of partial discharge. By arranging the first corona prevention layer 130 at the position corresponding to the groove part region S1 and optimally designing the first corona prevention layer 130, the current carrying capacity of the first corona prevention layer 130 can be improved, and the risk of partial discharge can be reduced.

Optionally, the first anti-corona layer 130 includes a first sub-anti-corona layer 131 and a second sub-anti-corona layer 132 which are stacked, that is, the first anti-corona layer 130 adopts a double-layer anti-corona layer design, so that the corresponding slot portion region S1 forms a double-channel structure, the surface resistivity of the slot portion region S1 anti-corona layer is reduced, the current carrying capacity of the slot portion region S1 is improved, thereby reducing the heating loss of the slot portion region S1 anti-corona layer, avoiding the local discharge phenomenon occurring in the slot portion region S1 of the bar body 110, especially in the slot outlet region, and ensuring the stable and reliable long-term operation of the stator bar 100.

The resistivity of the first sub corona prevention layer 131 and the resistivity of the second sub corona prevention layer 132 and the potential distribution of the surface of the groove part area S1 are directly influenced by the resistivity size relationship and the stacking arrangement mode of the first sub corona prevention layer 131 and the second sub corona prevention layer 132, and by adjusting the arrangement mode of the first sub corona prevention layer 131 and the second sub corona prevention layer 132, different corona prevention structure requirements can be met, and the overall voltage-resistant stability of the stator bar 100 is improved.

The stator bar 100 includes a second corona shield 140, the second corona shield 140 being wrapped over the main insulation 120 at a location corresponding to the end region S2. During use of the stator bar 100, the end region S2 of the bar body 110 has a high potential, a complex electric field distribution and a concentrated thermal stress, and leakage currents and capacitive currents generated in the end region S2 of the bar body 110 can flow to the slot region S1 and collect in the outlet area of the bar body 110, thereby increasing the risk of partial discharge in the slot region S1 of the bar body 110.

When the rated voltage level of the generator set is improved, the current generated by the end region S2 of the bar body 110 is increased, the electric field distortion of the curve region in the end region S2 of the bar body 110 is more serious, the generated heating loss is greatly increased, and the phenomenon of voltage-resistant flashover discharge is easy to occur. By providing the second corona prevention layer 140 at a position corresponding to the end region S2 and optimally designing the second corona prevention layer 140, the heat generation loss of the end region S2 can be reduced, and the partial discharge occurring in the groove region S1 can be alleviated.

The specific resistance of the second corona prevention layer 140 is greater than that of the first corona prevention layer 130, namely the first corona prevention layer 130 is of a low-resistance corona prevention structure, and the second corona prevention layer 140 is of a high-resistance corona prevention structure, so that leakage current and capacitance current generated by the end part area S2 of the bar body 110 are converged into the groove part area S1 of the bar body 110 and then reach a stator core grounding part, and the arrangement mode can reduce the overall temperature rise of the stator bar 100, reduce heating loss and avoid high-temperature ablation or partial discharge in the use process of the stator bar 100.

Optionally, the edge of the second anti-corona layer 140 partially overlaps the edge of the first anti-corona layer 130 to form an overlap region 150. That is, when the first corona prevention layer 130 and the second corona prevention layer 140 are coated on the surface of the main insulation layer 120, in order to ensure that the surface of the main insulation layer 120 is sufficiently coated with the corona prevention structure, the first corona prevention layer 130 and the second corona prevention layer 140 are partially overlapped, so as to avoid a gap from occurring between the first corona prevention layer 130 and the second corona prevention layer 140, which causes that leakage current and capacitance current generated in the end portion area S2 of the bar body 110 cannot be collected to the groove portion area S1 of the bar body 110 and are discharged through the stator core grounding component in time, thereby causing a partial discharge or high-temperature ablation phenomenon in the end portion area S2.

When the first corona prevention layer 130 and the second corona prevention layer 140 are overlapped, the first corona prevention layer 130 can be overlapped on the second corona prevention layer 140, or the second corona prevention layer 140 is overlapped on the first corona prevention layer 130, that is, the overlapping area 150 can be located in the end area S2 of the bar body 110, or in the groove area S1 of the bar body 110, or simultaneously spans over the groove area S1 and the end area S2, and the specific overlapping mode and the position of the overlapping area 150 can be adjusted accordingly according to actual design requirements, and no special limitation is made herein.

Optionally, the lap joint area 150 includes a first sub corona-proof layer 131, a second sub corona-proof layer 132 and a second corona-proof layer 140 which are stacked, that is, the lap joint area 150 adopts a manner of stacking multiple corona-proof layers, so as to form a dual-channel structure in the slot part area S1, especially the slot outlet area, of the bar body 110, reduce the surface resistivity of the slot part area S1, avoid the partial discharge phenomenon in the slot part area S1 during the use of the stator bar 100, and improve the stability of the overall structure of the stator bar 100.

The stator bar 100 in the embodiment of the application comprises a bar body 110, a main insulating layer 120, a first corona prevention layer 130 and a second corona prevention layer 140, wherein the bar body 110 is provided with a groove part area S1 and an end part area S2, the main insulating layer 120 covers the surface of the bar body 110, the first corona prevention layer 130 covers the main insulating layer 120 at a position corresponding to the groove part area S1, and the first corona prevention layer 130 comprises a first sub corona prevention layer 131 and a second sub corona prevention layer 132 which are arranged in a stacked mode; the second corona prevention layer 140 is coated on the main insulation layer 120 at a position corresponding to the end region S2, and the resistivity of the second corona prevention layer 140 is greater than that of the first corona prevention layer 130; the edge of the second corona-preventing layer 140 partially overlaps the edge of the first corona-preventing layer 130 to form an overlap region 150, and the overlap region 150 includes the first sub corona-preventing layer 131, the second sub corona-preventing layer 132, and the second corona-preventing layer 140, which are stacked. This application makes the regional S1 of slot part of bar body 110 form dual-channel structure through setting up first anticorona layer 130 into the first sub-anticorona layer 131 and the sub-anticorona layer 132 of range upon range of setting, reduces the surface resistivity of the regional S1 anticorona layer of slot part, avoids bar body 110 slot part region S1 to appear the partial discharge phenomenon.

Optionally, the lap region 150 includes a first sub corona-preventing layer 131, a second sub corona-preventing layer 132, and a second corona-preventing layer 140 sequentially arranged in a direction away from the main insulating layer 120. Namely, when the surface of the main insulating layer 120 is wrapped with the anti-corona structure, a mode that the groove part area S1 of the wire bar body 110 is gradually wrapped towards the end part area S2 of the wire bar body 110 is adopted, so that the anti-corona layer double-channel structure is formed in the groove part area S1 of the wire bar body 110, the surface resistivity of the anti-corona layer of the groove part area S1 is reduced, the current carrying capacity of the groove part area S1 is improved, and the phenomenon of partial discharge of the groove part area S1, particularly the outlet area, of the wire bar body 110 is avoided; meanwhile, the orderly binding process is facilitated, and the phenomenon that gaps occur between adjacent anti-corona layers in the binding process to influence the overall anti-corona effect of the anti-corona structure is avoided.

In some embodiments, the lap region 150 includes a first sub corona-preventing layer 131, a second corona-preventing layer 140, and a second sub corona-preventing layer 132 sequentially disposed in a direction away from the main insulating layer 120. Namely, the second corona prevention layer 140 at the lap joint area 150 is clamped between the first sub corona prevention layer 131 and the second sub corona prevention layer 132 in the first corona prevention layer 130, so that leakage current and capacitance current generated by the end area S2 of the bar body 110 uniformly flow to the groove area S1 of the bar body 110 at the lap joint area 150, which is beneficial to uniformly distributing surface electric field at the notch of the groove area S1 and avoiding partial discharge of the groove area S1.

In other embodiments, the lap region 150 includes the second corona-preventing layer 140, the first sub-corona-preventing layer 131, and the second sub-corona-preventing layer 132 sequentially disposed in a direction away from the main insulating layer 120. That is, the first corona prevention layer 130 of the lap joint region 150 is lapped on the second corona prevention layer 140, when the surface of the main insulation layer 120 is wrapped with the corona prevention structure, the second corona prevention layer 140 is wrapped at the end region S2 firstly, and then the first corona prevention layer 130 is wrapped at the groove region S1, so that a double-channel structure of the corona prevention layer can be formed in the groove region S1 of the wire rod body 110, the surface resistivity of the corona prevention layer of the groove region S1 is reduced, and the partial discharge phenomenon in the groove region S1, especially the groove outlet region, of the wire rod body 110 is avoided.

It should be noted that, in addition to the overlapping arrangement manner of each anti-corona layer in the overlapping area 150 in the foregoing embodiment, the overlapping arrangement manner of the first sub-anti-corona layer 131, the second sub-anti-corona layer 132, and the second anti-corona layer 140 can be adjusted accordingly according to actual use conditions, and it is only necessary to ensure that the multi-layer anti-corona structure in the overlapping area 150 can avoid partial discharge occurring in the groove portion area S1 of the bar body 110.

Optionally, the second sub-corona prevention layer 132 in the first corona prevention layer 130 covers the first sub-corona prevention layer 131, that is, the first sub-corona prevention layer 131 is wrapped at a position on the main insulation layer 120 corresponding to a notch of the slot portion S1, the second sub-corona prevention layer 132 is wrapped on the surface of the first sub-corona prevention layer 131, and covers the first sub-corona prevention layer 131, so as to increase the thickness of the first corona prevention layer 130 while forming a dual-channel structure in the first corona prevention layer 130, reduce the surface resistivity of the low-resistance corona prevention layer in the slot portion S1, and improve the current carrying capacity of the slot portion S1 of the bar body 110, thereby reducing the heat loss of the low-resistance corona prevention layer in the slot portion S1, and avoiding the partial discharge phenomenon in the slot portion S1 of the bar body 110.

Wherein the resistivity of the second sub corona prevention layer 132 is less than the resistivity of the first sub corona prevention layer 131, the second sub corona prevention layer 132 covers the first sub corona prevention layer 131, that is, the second sub corona prevention layer 132 is closer to the end of the slot portion S1 of the bar body 110 far from the end portion S2. During the use of the stator bar 100, leakage current and capacitance current generated by the end part area S2 of the bar body 110 can flow to the slot part area S1 of the bar body 110, namely, the leakage current and capacitance current generated by the end part area S2 of the bar body 110 flow to the first sub corona-prevention layer 131 and the second sub corona-prevention layer 132 through the second corona-prevention layer 140 and are collected to the stator core by the second sub corona-prevention layer 132, and the resistivity of the second sub corona-prevention layer 132 is set to be smaller than that of the first sub corona-prevention layer 131, so that the overall temperature rise on the stator bar 100 can be reduced, the heating loss can be reduced, and the phenomenon of high-temperature ablation or partial discharge during the use of the stator bar 100 can be avoided.

Optionally, the thickness of the first sub-antihalation layer 131 is greater than or equal to 0.06mm and less than or equal to 0.12 mm. If the thickness of the first sub corona-proof layer 131 is too large, the overall thickness of the corona-proof structure on the surface of the bar body 110 is too large, which is not favorable for uniform distribution of surface potential of the corona-proof structure; if the thickness of the first sub corona preventing layer 131 is too small, the current carrying capacity of the first sub corona preventing layer 131 is lowered, and a partial discharge phenomenon is likely to occur.

In the actual manufacturing process, the thickness of the first sub corona-preventing layer 131 can be set to be 0.06mm, 0.09mm, or 0.12mm, and the like, so that the first sub corona-preventing layer 131 can have sufficient current carrying capacity, and the uniform distribution of the surface potential of the whole corona-preventing structure is facilitated, and the specific design value can be adjusted correspondingly according to actual requirements, and the method is not limited herein.

Optionally, the thickness of the second sub-antihalation layer 132 is greater than or equal to 0.06mm and less than or equal to 0.12 mm. Similarly, in the actual manufacturing process, the thickness of the second sub corona shielding layer 132 can be set to be 0.06mm, 0.09mm, or 0.12mm, and the like, which not only can ensure that the second sub corona shielding layer 132 has sufficient current carrying capacity, but also can contribute to the uniform distribution of the surface potential of the whole corona shielding structure, and the specific design value can be adjusted accordingly according to the actual requirement, and is not limited herein.

In some embodiments, the thicknesses of the first and second sub corona prevention layers 131 and 132 are the same. When the first sub-anti-corona layer 131 and the second sub-anti-corona layer 132 form an anti-corona two-channel structure, the thicknesses of the first sub-anti-corona layer 131 and the second sub-anti-corona layer 132 are set to be the same, so that the surface resistance of the first anti-corona layer 130 is optimally designed, and the current carrying capacities of the first sub-anti-corona layer 131 and the second sub-anti-corona layer 132 are the same. When the current generated in the end region S2 of the bar body 110 flows from the second corona-proof layer 140 to the first sub corona-proof layer 131 and the second sub corona-proof layer 132, the current can be uniformly distributed on the first sub corona-proof layer 131 and the second sub corona-proof layer 132, which is beneficial to improving the uniformity of the surface potential distribution of the first corona-proof layer 130 and reducing the risk of partial discharge on the surface of the first corona-proof layer 130.

It should be noted that the thickness of the second corona prevention layer 140 can also be set to be equal to the thickness of the first sub corona prevention layer 131 and the second sub corona prevention layer 132, so as to adjust the overall surface resistance of the first corona prevention layer 130 and the second corona prevention layer 140, avoid high-temperature heating loss in a local area, and further reduce the risk of partial discharge on the surface of the stator bar 100.

Optionally, the length of the first sub-corona-preventing layer 131 in the extending direction of the wire rod body 110 is greater than or equal to 120mm and less than or equal to 180mm, so that a corona-preventing double-channel structure with a sufficient length is formed on the first corona-preventing layer 130, thereby reducing the surface resistance of the first corona-preventing layer 130, improving the current carrying capacity of the first corona-preventing layer 130, and reducing the risk of partial discharge on the surface of the first corona-preventing layer 130.

In an actual manufacturing process, the length of the first sub-corona prevention layer 131 in the extending direction of the wire rod body 110 can be set to be 120mm, 140mm, 160mm or 180mm, and the specific design value can be adjusted accordingly according to actual requirements, and is not limited here.

Optionally, when the first anti-corona layer 130 and the second anti-corona layer 140 are overlapped with each other to form the overlapping region 150, the length of the overlapping region 150 in the extending direction of the wire rod body 110 is greater than or equal to 15mm and less than or equal to 25 mm. If the lap joint area 150 is too large, when the current generated by the end area S2 is collected to the groove area S1 in the lap joint area 150, the current of the lap joint area 150 is too large as a whole, thereby generating local overheating, and even causing local discharge or high-temperature ablation in the lap joint area 150; if the overlap area 150 is too small, the first corona prevention layer 130 and the second corona prevention layer 140 may be loosened or loosened due to manufacturing errors during manufacturing or using the stator bar 100, so that a gap may be formed between the first corona prevention layer 130 and the second corona prevention layer 140, and the overall corona prevention effect of the corona prevention structure of the stator bar 100 may be affected.

In the sub-actual manufacturing process, the length of the lap joint area 150 in the extending direction of the line rod body 110 can be set to be 15mm, 18mm, 20mm, 23mm or 25mm and the like, so that the effective lap joint between the first corona prevention layer 130 and the second corona prevention layer 140 can be ensured, the phenomenon of local overheating or local discharge of the lap joint area 150 between the first corona prevention layer 130 and the second corona prevention layer 140 can be avoided, the specific setting value can be correspondingly adjusted according to actual requirements, and the limitation is not made here.

Optionally, in the embodiment of the present application, the second anti-corona layer 140 includes a first anti-corona section 141, a second anti-corona section 142, and a third anti-corona section 143, which are sequentially overlapped along the distance from the groove portion S1. By designing the second corona prevention layer 140 into multiple sections in a lap joint arrangement, the overall resistivity of the second corona prevention layer 140 and the surface resistivity of the second corona prevention layer 140 can be adjusted according to the arrangement of the resistivity of each corona prevention section and the lap joint mode, so that the phenomenon of local thermal stress concentration or high-temperature ablation on the surface of the second corona prevention layer 140 is avoided.

The second anti-corona layer 140 may be overlapped in a manner that the first anti-corona section 141 is overlapped on the first anti-corona layer 130, the second anti-corona section 142 is overlapped on the first anti-corona section 141, and the third anti-corona section 143 is overlapped on the second anti-corona section 142; or the first anti-corona section 141 is overlapped on the first anti-corona layer 130, meanwhile, the first anti-corona section 141 is overlapped at one end of the second anti-corona section 142, and the third anti-corona section 143 is overlapped at the other end of the second anti-corona section 142; or the first anti-corona section 141 is overlapped on the first anti-corona layer 130, and two ends of the second anti-corona section 142 are respectively overlapped on the first anti-corona section 141 and the third anti-corona section 143, or other feasible overlapping modes are adopted, so that the linear relation of the resistivity among the anti-corona sections in the second anti-corona layer 140 can be favorably optimized by only ensuring that the overlapping among the first anti-corona section 141, the second anti-corona section 142 and the third anti-corona section 143 is favorable, and the occurrence of partial discharge is avoided.

Alternatively, the resistivity of the first corona prevention section 141, the second corona prevention section 142 and the third corona prevention section 143 increases in sequence, that is, the resistivity of each corona prevention section corresponding to the end region S2 of the bar body 110 increases gradually from the end close to the slot region S1 to the end far from the slot region S1. During use of the stator bar 100, leakage and capacitance currents generated in the end region S2 of the bar body 110 flow to the slot region S1 of the bar body 110, i.e., leakage and capacitance currents generated in the end region S2 of the bar body 110 gradually flow from the end remote from the slot region S1 to the end adjacent the slot region S1. The electrical resistivity of the first corona prevention section 141, the second corona prevention section 142 and the third corona prevention section 143 is set to be increased in sequence, so that the overall temperature rise of the end part area S2 of the bar body 110 can be reduced, and the partial discharge or high-temperature ablation phenomenon of the end part area S2 of the bar body 110 is avoided.

In the actual use process, the actual electric field distribution of the end area S2 of the bar body 110 may have a certain difference, and the magnitude relation of the resistivity among the corresponding first corona prevention section 141, second corona prevention section 142 and third corona prevention section 143 can be correspondingly adjusted accordingly, so that it is only required to ensure that the partial discharge or high-temperature ablation phenomenon does not occur in the end area S2 of the stator bar 100.

It should be noted that, according to actual design requirements, the second anti-corona layer 140 can be continuously divided into multiple segments, for example, the second anti-corona layer 140 is divided into four sequentially overlapping anti-corona segments or five sequentially overlapping anti-corona segments, and the specific structural composition thereof can be adjusted accordingly according to requirements. Similarly, the resistivity between the multiple corona-proof sections can be adjusted according to the design requirement, and is not limited herein.

Optionally, the stator bar 100 further includes a first protective layer 160, and the first protective layer 160 is coated on the second corona-proof layer 140, that is, the first protective layer 160 is used to protect the corona-proof structure of the end region S2 of the bar body 110, so as to avoid the influence of the damage of the second corona-proof layer 140 on the corona-proof effect of the second corona-proof layer 140 during the transportation or use of the stator bar 100.

The stator bar 100 further comprises a second protective layer 170, the second protective layer 170 is coated on the first corona prevention layer 130, wherein the first corona prevention layer 130 is of a low-resistance corona prevention structure, and the second protective layer 170 is low-resistance corona prevention paint, so that the protective effect on the first corona prevention layer 130 is enhanced, the stability of the corona prevention structure of the groove part area S1 of the bar body 110 is ensured, and the service life of the stator bar 100 is prolonged.

The stator bar 100 further comprises a third protection layer 180, the third protection layer 180 is coated on the first protection layer 160, wherein the second corona prevention layer 140 is of a high-resistance corona prevention structure, and the third protection layer 180 is made of high-resistance corona prevention paint so as to further protect the second corona prevention layer 140, prevent the second corona prevention layer 140 from being damaged in the using or carrying process of the stator bar 100, and improve the overall stability of the corona prevention structure of the stator bar 100.

This application embodiment sets up first anticorona layer 130 through regional S1 slot part of bar body 110 into first sub-anticorona layer 131 and second sub-anticorona layer 132, in order to go out the notch region formation low resistance anticorona structure binary channels promptly at overlap joint area 150, can reduce the surface resistivity of the regional S1 first anticorona layer 130 of slot part, improve bar body 110 slot part regional S1' S current carrying ability, reduce the loss of generating heat of the regional S1 low resistance anticorona layer of slot part, avoid bar body 110 slot part regional S1 to appear partial discharge phenomenon, guarantee the stable and reliable of stator bar 100 long-term operation. Furthermore, the temperature rise of the end region S2 of the stator bar 100 during the high voltage test can be reduced by 10K.

Secondly, the embodiment of the application also provides a stator, the stator comprises a stator bar, the specific structure of the stator bar refers to the above embodiments, and the stator adopts all the technical solutions of all the above embodiments, so that at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved. And will not be described in detail herein.

Wherein the stator comprises stator bars 100 and a stator core connected with slot regions S1 of the stator bars 100, the stator core being the main magnetic circuit of the stator and also being the mounting and fixing component of the stator bars 100. Through the design of the lap joint mode of the anti-corona structure in the stator bar 100, the current carrying capacity of the lap joint area 150 in the anti-corona structure can be improved, the risk of partial discharge or high-temperature ablation of the lap joint area 150 is reduced, and therefore the service life of the stator is prolonged.

Finally, the embodiment of the application also provides a generator, which comprises a stator and a rotor, wherein the stator is connected with a bearing seat of the generating equipment, and the rotor is connected with a rotating shaft of the generating equipment. Through the optimal design of the anti-corona structure in the stator bar 100, the risk of partial discharge or high-temperature ablation of the anti-corona structure can be reduced, and the structural stability of the stator bar 100 is improved, so that the structural stability of a stator is ensured, and the service life of a generator is prolonged.

The foregoing detailed description is directed to a stator bar, a stator and a generator provided in the embodiments of the present application, and the principles and embodiments of the present application are described herein by way of specific examples, which are provided only to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. A stator bar, characterized in that said stator bar comprises:

a bar body having a groove region and an end region connected in sequence along an extension direction of the bar body;

the main insulating layer is coated on the surface of the wire rod body;

the first anti-corona layer is coated on the main insulating layer at the position corresponding to the groove part area; the first anti-corona layer comprises a first sub-anti-corona layer and a second sub-anti-corona layer which are arranged in a stacked mode;

the second anti-corona layer is coated on the main insulating layer at a position corresponding to the end part area; the resistivity of the second anti-corona layer is greater than the resistivity of the first anti-corona layer;

the second anti-corona layer edge is partially overlapped with the first anti-corona layer edge to form an overlapping area; the lap joint region comprises the first sub corona-proof layer, the second sub corona-proof layer and the second corona-proof layer which are arranged in a stacked mode.

2. A stator bar according to claim 1, wherein the overlap region comprises the first sub corona protection layer, the second sub corona protection layer and the second corona protection layer disposed in that order in a direction away from the main insulation layer; or the like, or, alternatively,

the lap joint region comprises the first sub anti-corona layer, the second anti-corona layer and the second sub anti-corona layer which are sequentially arranged along the direction far away from the main insulating layer.

3. A stator bar in accordance with claim 1, wherein said second sub corona protection layer covers said first sub corona protection layer; the resistivity of the second sub corona prevention layer is smaller than that of the first sub corona prevention layer.

4. A stator bar according to claim 3, characterized in that the thickness of the first sub anti-corona layer is greater than or equal to 0.06mm and less than or equal to 0.12 mm; the thickness of the second sub-anti-corona layer is greater than or equal to 0.06mm and less than or equal to 0.12 mm.

5. A stator bar according to claim 3, characterized in that the length of the first sub anti-corona layer in the direction of extension of the bar body is greater than or equal to 120mm and less than or equal to 180 mm; the length of the overlapping area along the extending direction of the bar body is greater than or equal to 15mm and less than or equal to 25 mm.

6. A stator bar according to any one of claims 1 to 5, wherein the second corona resistant layer includes first, second and third corona resistant sections disposed in overlapping relationship in that order along a region remote from the slot portion; the first anti-corona section edge is partially overlapped with the first anti-corona layer edge to form the overlapping area.

7. A stator bar according to claim 6, wherein the resistivity of the first, second and third corona protection sections increases sequentially.

8. A stator bar according to claim 1, further comprising:

the first protective layer is coated on the second anti-corona layer;

the second protective layer is coated on the first anti-corona layer;

and the third protective layer is coated on the first protective layer.

9. A stator, characterized in that it comprises stator bars as claimed in any one of claims 1 to 8.

10. A generator, characterized in that it comprises a stator according to claim 9.

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