CN114400814A - Stator bar, stator and generator - Google Patents
Stator bar, stator and generator Download PDFInfo
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- CN114400814A CN114400814A CN202210060963.5A CN202210060963A CN114400814A CN 114400814 A CN114400814 A CN 114400814A CN 202210060963 A CN202210060963 A CN 202210060963A CN 114400814 A CN114400814 A CN 114400814A
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- corona
- layer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/38—Windings characterised by the shape, form or construction of the insulation around winding heads, equalising connectors, or connections thereto
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
The embodiment of the application discloses a stator bar, a stator and a generator. The stator bar comprises a bar body, a main insulating layer, a first anti-corona structure and a second anti-corona structure; the bar body has a slot region and an end region; the main insulating layer is coated on the surface of the wire rod body, the first corona prevention structure is coated on the main insulating layer at a position corresponding to the groove part area, the second corona prevention structure is coated on the main insulating layer at a position corresponding to the end part area, the resistivity of the second corona prevention structure is larger than that of the first corona prevention structure, and the second corona prevention structure comprises a first corona prevention layer and a second corona prevention layer which are arranged in a stacked mode; the edge of the second anti-corona structure is partially overlapped with the edge of the first anti-corona structure to form an overlapping area; the lap joint area comprises a first anti-corona structure, a first anti-corona layer and a second anti-corona layer which are arranged in a stacked mode. This application is through setting up first dizzy structure, first dizzy layer and the dizzy layer of second of preventing in the range upon range of in overlap joint region, can improve the current-carrying capacity in overlap joint region, avoids overlap joint region high temperature ablation phenomenon to appear.
Description
Technical Field
The application relates to the technical field of generators, in particular to a stator bar, a stator and a generator.
Background
The generator stator bar end part area has high electric potential, electric field distribution is complicated and thermal stress is concentrated, and bar end part leakage current and capacitance current are converged to the bar groove part area and then reach the stator iron 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, the electric field distortion at the end part of the stator bar is more serious, and the generated heating loss is also greatly increased. When the alternating-current voltage withstand test is carried out on the stator bar, the temperature rise of the lap joint area of the anti-corona structure corresponding to the end part area and the groove part area of the stator bar is high, and the high-temperature ablation phenomenon is easy to occur.
Disclosure of Invention
The embodiment of the application provides a stator bar, stator and generator, can solve the problem that high temperature ablation easily appears in the lap joint area of the anti-corona structure that current stator bar tip region and slot part region correspond.
The present application embodiments provide a stator bar, the stator bar includes:
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 structure is coated on the main insulating layer at a position corresponding to the groove part area;
the second anti-corona structure is coated on the main insulating layer at a position corresponding to the end part area, and the resistivity of the second anti-corona structure is greater than that of the first anti-corona structure; the second anti-corona structure comprises a first anti-corona layer and a second anti-corona layer which are arranged in a stacked mode;
the second anti-corona structure edge is partially overlapped with the first anti-corona structure edge to form an overlapping area; the lap joint region comprises the first anti-corona structure, the first anti-corona layer and the second anti-corona layer which are arranged in a stacked mode.
Optionally, in some embodiments of the present application, the lap joint region includes the first anti-corona structure, the first anti-corona layer, and the second anti-corona layer, which are sequentially disposed in a direction away from the main insulating layer.
Optionally, in some embodiments of the present application, the second anti-corona layer covers the first anti-corona layer; the resistivity of the second anti-corona layer is greater than the resistivity of the first anti-corona layer.
Optionally, in some embodiments of the present application, the first anti-corona structure includes a third anti-corona layer and a fourth anti-corona layer, which are stacked, and the overlapping region includes the first anti-corona layer, the second anti-corona layer, the third anti-corona layer, and the fourth anti-corona layer, which are stacked.
Optionally, in some embodiments of the present application, the lap joint region includes the third anti-corona layer, the fourth anti-corona layer, the first anti-corona layer, and the second anti-corona layer, which are sequentially disposed along a direction away from the main insulating layer; or the like, or, alternatively,
the lap joint region comprises the third anti-corona layer, the first anti-corona layer, the fourth anti-corona layer and the second anti-corona layer which are sequentially arranged along the direction far away from the main insulating layer; or the like, or, alternatively,
the lap joint region comprises a first anti-corona layer, a third anti-corona layer, a fourth anti-corona layer and a second 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 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.
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 anti-corona protective layer is coated on the second anti-corona structure;
the first anti-corona paint is coated on the anti-corona protective layer;
and the second anti-corona paint is coated on the first anti-corona structure.
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 in the embodiment of the application comprises a bar body, a main insulating layer, a first anti-corona structure and a second anti-corona structure; the bar body has a slot region and an end region; the main insulating layer is coated on the surface of the wire rod body, the first corona prevention structure is coated on the main insulating layer at a position corresponding to the groove part area, the second corona prevention structure is coated on the main insulating layer at a position corresponding to the end part area, the resistivity of the second corona prevention structure is larger than that of the first corona prevention structure, and the second corona prevention structure comprises a first corona prevention layer and a second corona prevention layer which are arranged in a stacked mode; the edge of the second anti-corona structure is partially overlapped with the edge of the first anti-corona structure to form an overlapping area; the lap joint area comprises a first anti-corona structure, a first anti-corona layer and a second anti-corona layer which are arranged in a stacked mode. This application is through setting up first dizzy structure, first dizzy layer and the dizzy layer of second of preventing in the range upon range of in overlap joint region, can improve the current-carrying capacity in overlap joint region, avoids overlap joint region high temperature ablation phenomenon to appear.
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 structure 130, the first anti-corona structure 130 being wrapped over 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 stator bar 100, particularly the outlet region, has a complicated potential distribution and a concentrated thermal stress, and is a high-occurrence region of partial discharge. By arranging the first corona prevention structure 130 at the position corresponding to the groove part region S1 and optimally designing the first corona prevention structure 130, the current carrying capacity of the first corona prevention structure 130 can be improved, and the risk of partial discharge is reduced.
The stator bar 100 also includes a second anti-corona structure 140, the second anti-corona structure 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 stator bar 100, particularly the curved region connected to the slot region S1, has a high potential, a complex electric field distribution and a concentrated thermal stress, and leakage currents and capacitive currents generated by the bar end region S2 can flow to the slot region S1 and collect in the outlet region of the stator bar 100, thereby increasing the risk of partial discharge in the slot region S1 of the stator bar 100.
When the rated voltage level of the generator set is improved, the current generated by the end region S2 of the stator bar 100 is increased, the electric field distortion of the curve region in the end region S2 of the stator bar 100 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 structure 140 at a position corresponding to the end region S2 and optimally designing the second corona prevention structure 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 structure 140 is greater than that of the first corona prevention structure 130, namely, the first corona prevention structure 130 is a low-resistance corona prevention structure, and the second corona prevention structure 140 is a high-resistance corona prevention structure, because leakage current and capacitance current generated by the end region S2 of the stator bar 100 are collected to the groove region S1 of the stator bar 100 and then to the stator core grounding part, the arrangement mode can reduce the integral temperature rise on the stator bar 100, and the high-temperature ablation phenomenon in the use process of the stator bar 100 is avoided.
Optionally, the second corona prevention structure 140 includes a first corona prevention layer 141 and a second corona prevention layer 142 which are stacked, that is, the second corona prevention structure 140 adopts a double-layer corona prevention layer design, so that the corresponding end region S2 forms a double-channel structure, the nonlinear coefficient of the corresponding region corona prevention layer is improved, and the phenomenon of voltage-resistant flashover discharge at the end of the winding bar is avoided.
The resistivity size relationship and the stacking arrangement mode of the first corona prevention layer 141 and the second corona prevention layer 142 directly influence the surface resistivity of the second corona prevention structure 140 and the potential distribution of the end part area S2, and the arrangement modes of the first corona prevention layer 141 and the second corona prevention layer 142 are adjusted, so that different corona prevention structure requirements can be met, and the overall voltage-resistant stability of the stator bar 100 is improved.
Optionally, the edge of the second anti-corona structure 140 partially overlaps the edge of the first anti-corona structure 130 to form an overlap region 150. That is, when the first corona prevention structure 130 and the second corona prevention structure 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 structure 130 and the second corona prevention structure 140 are partially overlapped, so as to avoid a gap from occurring between the first corona prevention structure 130 and the second corona prevention structure 140, which causes that leakage current and capacitance current generated by the end portion region S2 of the stator bar 100 cannot be collected to the slot portion region S1 of the stator bar 100 and are discharged through the stator core grounding component in time, thereby causing a partial discharge phenomenon to occur in the end portion region S2.
When the first corona prevention structure 130 and the second corona prevention structure 140 are overlapped, the first corona prevention structure 130 can be overlapped on the second corona prevention structure 140, or the second corona prevention structure 140 is overlapped on the first corona prevention structure 130, that is, the overlapping region 150 can be located in the end region S2 of the stator bar 100, or in the slot region S1 of the stator bar 100, or simultaneously spans the slot region S1 and the end region S2, and the specific overlapping manner and the position of the overlapping region 150 can be adjusted according to the actual design requirement, which is not limited herein.
Optionally, the lap-joint area 150 includes a first corona-proof structure 130, a first corona-proof layer 141 and a second corona-proof layer 142 which are stacked, that is, the lap-joint area 150 adopts a multi-layer corona-proof layer stacking manner, so as to form a multi-channel structure in the lap-joint area 150, reduce the surface resistivity of the lap-joint area 150, avoid the high-temperature ablation phenomenon in the lap-joint area 150 due to excessive temperature rise in the use process of the stator bar 100, and improve the stability of the overall structure of the stator bar 100.
The stator bar 100 in the present embodiment includes a bar body 110, a main insulation layer 120, a first anti-corona structure 130, and a second anti-corona structure 140; 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-proof structure 130 covers the position, corresponding to the groove part area S1, of the main insulating layer 120, the second corona-proof structure 140 covers the position, corresponding to the end part area S2, of the main insulating layer 120, the resistivity of the second corona-proof structure 140 is larger than that of the first corona-proof structure 130, and the second corona-proof structure 140 comprises a first corona-proof layer 141 and a second corona-proof layer 142 which are arranged in a stacked mode; the edge of the second anti-corona structure 140 partially overlaps the edge of the first anti-corona structure 130 to form an overlap region 150, and the overlap region 150 includes the first anti-corona structure 130, the first anti-corona layer 141, and the second anti-corona layer 142, which are stacked. This application can improve the current-carrying capacity of overlap joint region 150 through range upon range of first anticorona structure 130, first anticorona layer 141 and the second anticorona layer 142 of setting at overlap joint region 150, avoids overlap joint region 150 high temperature ablation phenomenon to appear.
Optionally, the lap joint region 150 includes a first corona prevention structure 130, a first corona prevention layer 141 and a second corona prevention layer 142 which are sequentially arranged along a direction away from the main insulation layer 120, that is, when the corona prevention structure is wrapped on the surface of the main insulation layer 120, a mode of gradually wrapping the slot region S1 of the stator bar 100 to the end region S2 of the stator bar 100 is adopted, so that the orderly wrapping process is facilitated, and the phenomenon that a gap appears between adjacent corona prevention structures in the wrapping process to influence the overall corona prevention effect of the corona prevention structure is avoided.
It should be noted that, when the bandage is performed, the first anti-corona structure 130 can be located between the first anti-corona layer 141 and the second anti-corona layer 142, or the first anti-corona structure 130 is located on the outer surfaces of the first anti-corona layer 141 and the second anti-corona layer, and the specific arrangement manner of the first anti-corona structure 130 can be adjusted according to the actual situation, and it is only required to ensure that the lap joint area 150 includes the first anti-corona structure 130, the first anti-corona layer 141, and the second anti-corona layer 142 which are arranged in a stacked manner, so as to form a multi-channel structure in the lap joint area 150, which is not limited herein.
Optionally, the second corona prevention layer 142 in the second corona prevention structure 140 covers the first corona prevention layer 141, that is, the first corona prevention layer 141 is bound at a partial position on the main insulation layer 120 corresponding to the end region S2, and the second corona prevention layer 142 is bound on the surface of the first corona prevention layer 141 and covers the first corona prevention structure 130, so as to increase the thickness of the second corona prevention structure 140 while forming a two-channel structure in the second corona prevention structure 140, improve the nonlinear coefficient of the high-resistance corona prevention structure, and avoid the occurrence of a voltage-withstanding flashover discharge phenomenon in the end region S2 of the stator bar 100.
Wherein the resistivity of the second corona shielding layer 142 is greater than the resistivity of the first corona shielding layer 141, the second corona shielding layer 142 overlies the first corona shielding layer 141, i.e., the second corona shielding layer 142 is closer to an end of the end region S2 of the stator bar 100 away from the slot region S1. During the use of the stator bar 100, leakage current and capacitance current generated by the end area S2 of the stator bar 100 can flow to the slot area S1 of the stator bar 100, namely the leakage current and capacitance current generated by the end area S2 of the stator bar 100 flow to the first corona prevention layer 141 through the second corona prevention layer 142 and then are collected to the slot area S1, the resistivity of the second corona prevention layer 142 is set to be larger than that of the first corona prevention layer 141, the overall temperature rise on the stator bar 100 can be reduced, and the high-temperature ablation phenomenon during the use of the stator bar 100 can be avoided.
Optionally, the first corona prevention structure 130 includes a third corona prevention layer 131 and a fourth corona prevention layer 132 which are stacked, that is, the first corona prevention structure 130 adopts a double-layer corona prevention layer design, so that the corresponding slot portion S1 forms a double-channel structure, the surface resistivity of the low-resistance corona prevention structure of the slot portion S1 is reduced, and the partial discharge phenomenon of the slot portion S1 of the stator bar 100 is avoided.
The resistivity relationship and the stacking arrangement mode of the third corona prevention layer 131 and the fourth corona prevention layer 132 directly influence the surface resistivity of the first corona prevention structure 130 and the potential distribution of the groove part area S1, and the setting modes of the third corona prevention layer 131 and the fourth corona prevention layer 132 are adjusted, so that different corona prevention structure requirements can be met, and the overall pressure-resistant stability of the stator bar 100 is improved.
Optionally, the lap joint area 150 includes a first corona-proof layer 141, a second corona-proof layer 142, a third corona-proof layer 131 and a fourth corona-proof layer 132 which are stacked, that is, the lap joint area 150 adopts a mode of stacking multiple corona-proof layers, so that a dual-channel structure of a low-resistance corona-proof structure and a dual-channel structure of a high-resistance corona-proof structure are formed in the lap joint area 150 at the same time, the surface resistivity of the lap joint area 150 is further reduced, and the phenomenon of high-temperature ablation caused by excessive temperature rise in the lap joint area 150 in the use process of the stator bar 100 is avoided, so that the stability of the overall structure of the stator bar 100 is further improved.
The overlapping mode of the first anti-corona layer 141, the second anti-corona layer 142, the third anti-corona layer 131 and the fourth anti-corona layer 132, namely the overlapping mode of the first anti-corona layer 141, the second anti-corona layer 142, the third anti-corona layer 131 and the fourth anti-corona layer 132, can be correspondingly adjusted according to design requirements and a wrapping process, and only the multi-channel structure of the overlapping area 150 needs to be ensured, so that the limitation is not required.
In some embodiments, the lap region 150 includes a third anti-corona layer 131, a fourth anti-corona layer 132, a first anti-corona layer 141, and a second anti-corona layer 142 sequentially disposed along the main insulating layer 120, that is, the third anti-corona layer 131 and the fourth anti-corona layer 132 are sequentially wrapped at a position corresponding to the groove portion S1 on the main insulating layer 120 to form the first anti-corona structure 130; the first anti-corona layer 141 and the second anti-corona layer 142 are then sequentially wrapped around the main insulation layer 120 at positions corresponding to the end regions S2 to form the second anti-corona structure 140, such that the second anti-corona structure 140 overlaps the first anti-corona structure 130.
The structure design enables the first corona prevention structure 130 and the second corona prevention structure 140 in the lap joint area 150 to form a double-channel structure respectively, namely the first corona prevention structure 130 forms double channels of a low-resistance corona prevention structure, and the second corona prevention structure 140 forms double channels of a high-resistance corona prevention structure, so that the surface resistivity of the lap joint area 150 is reduced, and the phenomenon of high-temperature ablation of the lap joint area 150 due to excessive temperature rise in the use process of the stator bar 100 is avoided. Meanwhile, the mode that the slot part area S1 of the stator bar 100 is gradually bound to the end part area S2 of the stator bar 100 is adopted, the orderly binding process is facilitated, and the binding efficiency is improved.
In other embodiments, the lap region 150 includes third, first, fourth and second anti-corona layers 131, 141, 132 and 142 sequentially disposed along the main insulating layer 120, i.e., the anti-corona layers in the first and second anti-corona structures 130 and 140 are staggered. That is, the third corona prevention layer 131 is wrapped on the main insulating layer 120 at a position corresponding to the groove portion region S1; then, wrapping the first corona prevention layer 141 on the main insulation layer 120 at a position corresponding to the end region S2, and overlapping the first corona prevention layer 131; then, the fourth corona prevention layer 132 is wrapped on the third corona prevention layer 131 and is overlapped on the first corona prevention layer 141; the second antihalation layer 142 is then wrapped over the first antihalation layer 141 and lapped over the fourth antihalation layer 132. Wherein, the first corona-proof layer 141 and the second corona-proof layer 142 are high-resistance corona-proof layers, and the third corona-proof layer 131 and the fourth corona-proof layer 132 are low-resistance corona-proof layers, so as to realize the staggered overlapping of the low-resistance corona-proof layers and the high-resistance corona-proof layers.
Due to the structural design, the lap joint area 150 is formed by alternately forming the low-resistance anti-corona layer and the high-resistance anti-corona layer, so that two channels of the low-resistance anti-corona structure and two channels of the high-resistance anti-corona structure which are mutually staggered are formed, the uniform distribution of the electric field on the surface of the lap joint area 150 is facilitated, and the partial discharge on the surface of the lap joint area 150 is avoided. Meanwhile, the anti-corona layers in the first anti-corona structure 130 and the second anti-corona structure 140 are overlapped alternately, so that leakage current and capacitance current generated in the end part area S2 of the stator bar 100 uniformly flow to the slot part area S1 of the stator bar 100 in the overlapping area 150, and the high-temperature ablation phenomenon in the overlapping area 150 is avoided.
In still other embodiments, the lap region 150 includes a first anti-corona layer 141, a third anti-corona layer 131, a fourth anti-corona layer 132, and a second anti-corona layer 142 disposed in that order along and away from the main insulating layer 120, i.e., the first anti-corona structure 130 is disposed entirely between the first anti-corona layer 141 and the second anti-corona layer 142. That is, the first corona prevention layer 141 is wrapped on the main insulation layer 120 at a position corresponding to the end region S2; then sequentially binding a third corona prevention layer 131 and a fourth corona prevention layer 132 at the position, corresponding to the groove part area S1, on the main insulating layer 120, so that the third corona prevention layer 131 is lapped on the first corona prevention layer 141, and the fourth corona prevention layer 132 covers the third corona prevention layer 131; and then, a second anti-corona layer 142 is wrapped on the first anti-corona layer 141, so that the second anti-corona layer 142 is lapped on the first anti-corona layer 141, and the low-resistance anti-corona structure is arranged between two layers of high-resistance anti-corona structures.
By the structural design, the lap joint area 150 is formed by clamping two low-resistance corona prevention structures between two high-resistance corona prevention structures, so that two channels of the low-resistance corona prevention structures are clamped between two channels of the high-resistance corona prevention structures, and leakage current and capacitance current generated by the end area S2 of the stator bar 100 flow to the lap joint area 150 from the first corona prevention layer 141 and the second corona prevention layer 142 and then flow to the groove area S1 of the stator bar 100 from the third corona prevention layer 131 and the fourth corona prevention layer 132 in the middle of the lap joint area 150, so that the current can uniformly flow in the lap joint area 150, and the risk of high-temperature ablation in the lap joint area 150 is reduced.
It should be noted that, in addition to the overlapping arrangement manner of the anti-corona layers in the overlapping area 150 in the above embodiment, the overlapping arrangement manner of the first anti-corona layer 141, the second anti-corona layer 142, the third anti-corona layer 131 and the fourth anti-corona layer 132 can be adjusted according to actual use conditions, and it is only necessary to ensure that the multi-layer anti-corona structure of the overlapping area 150 can avoid the high-temperature ablation phenomenon in the overlapping area 150.
Optionally, in the embodiment of the present application, the second anti-corona layer 142 includes a first anti-corona section 1421, a second anti-corona section 1422, and a third anti-corona section 1423, which are sequentially overlapped along the distance from the groove portion S1. Through designing second anticorona layer 142 into the multistage of overlap joint setting, can adjust the whole resistivity of second anticorona layer 142 and the surface resistivity of second anticorona structure 140 according to the setting of each anticorona section resistivity and overlap joint mode to avoid second anticorona structure 140 surface local thermal stress concentration or high temperature ablation phenomenon to appear.
The overlapping arrangement manner of the second anti-corona layer 142 may be that the first anti-corona section 1421 covers the first anti-corona layer 141, the second anti-corona section 1422 overlaps the first anti-corona section 1421, and the third anti-corona section 1423 overlaps the second anti-corona section 1422; or the first anti-corona section 1421 covers the first anti-corona layer 141, meanwhile, the first anti-corona section 1421 is overlapped at one end of the second anti-corona section 1422, and the third anti-corona section 1423 is overlapped at the other end of the second anti-corona section 1422; or the first anti-corona section 1421 covers the first anti-corona layer 141, and two ends of the second anti-corona section 1422 are respectively overlapped on the first anti-corona section 1421 and the third anti-corona section 1423, or other feasible overlapping manners are adopted, so that the linear relation of the resistivity among the anti-corona sections in the second anti-corona layer 142 can be optimized by only ensuring that the overlapping among the first anti-corona section 1421, the second anti-corona section 1422 and the third anti-corona section 1423 is facilitated, and the occurrence of partial discharge is avoided.
Alternatively, the resistivity of the first corona prevention section 1421, the second corona prevention section 1422, and the third corona prevention section 1423 increases in sequence, that is, the resistivity of each corona prevention section corresponding to the end region S2 of the stator bar 100 increases gradually from the end close to the slot region S1 toward 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 stator bar 100 flow to the slot region S1 of the stator bar 100, i.e., leakage and capacitance currents generated in the end region S2 of the stator bar 100 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 1421, the second corona prevention section 1422 and the third corona prevention section 1423 is set to be increased in sequence, so that the overall temperature rise of the end area S2 of the stator bar 100 can be reduced, and the phenomenon of partial discharge or high-temperature ablation in the end area S2 of the stator bar 100 is avoided.
In the actual use process, there may be a certain difference in the actual electric field distribution of the end portion area S2 of the stator bar 100, and the magnitude relationship of the resistivity among the corresponding first corona prevention section 1421, second corona prevention section 1422, and third corona prevention section 1423 can be correspondingly adjusted accordingly, so that it is only necessary to ensure that the partial discharge or high-temperature ablation phenomenon does not occur in the end portion area S2 of the stator bar 100.
It should be noted that, according to actual design requirements, the second anti-corona layer 142 can be continuously divided into multiple segments, for example, the second anti-corona layer 142 is divided into four sequentially overlapping anti-corona segments or five sequentially overlapping anti-corona segments, and the specific structural composition thereof can be correspondingly adjusted 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 an anti-corona protection layer 160, and the anti-corona protection layer 160 is coated on the second anti-corona structure 140, that is, the anti-corona protection layer 160 is used to protect the anti-corona structure of the end region S2 of the stator bar 100, so as to prevent the second anti-corona structure 140 from being damaged and affecting the anti-corona effect of the second anti-corona structure 140 during the transportation or use of the stator bar 100.
The stator bar 100 further comprises a first corona prevention lacquer 170, and the first corona prevention lacquer 170 is coated on the corona prevention protective layer 160, wherein the second corona prevention structure 140 is a high-resistance corona prevention structure, and the first corona prevention lacquer 170 is the high-resistance corona prevention lacquer, so that the protection effect on the second corona prevention structure 140 is further enhanced, the stability of the corona prevention structure of the end part area S2 of the stator bar 100 is ensured, and the service life of the stator bar 100 is prolonged.
The stator bar 100 further comprises a second corona prevention paint 180, and the first corona prevention structure 130 is coated with the second corona prevention paint 180, wherein the first corona prevention structure 130 is a low-resistance corona prevention structure, and the second corona prevention paint 180 is low-resistance corona prevention paint to protect the first corona prevention structure 130, so that the first corona prevention structure 130 is prevented from being damaged in the process of using or carrying the stator bar 100, and the overall stability of the corona prevention structure of the stator bar 100 is improved.
Optionally, the surface of the first corona-proof paint 170 is further coated with a layer of arc-resistant red enamel paint to further enhance the protection effect on the second corona-proof structure 140, reduce the risk of high-temperature ablation or discharge flashover phenomenon in the end region S2 of the stator bar 100 in the use process, and improve the service stability and the service life of the stator bar 100.
Specifically, to further illustrate the formation of the anti-corona structure on the surface of the wire rod body 110, one of the embodiments is described below, and those skilled in the art will be able to make modifications in the embodiments and applications according to the spirit of the present application.
Firstly, a main insulating layer 120 is wrapped on the surface of the wire bar body 110, wherein the main insulating layer 120 adopts a vacuum pressure impregnation mode to realize the tight coating of the main insulating layer 120 and the wire bar body and prevent the mutual interference between two adjacent stator wire bars 100.
After the main insulating layer 120 is wrapped, a third corona-proof layer 131 is half-wrapped at a position, close to the end part region S2, of a groove region S1 of the wire rod body 110, the wrapping length of the third corona-proof layer 131 is greater than or equal to 120mm and less than or equal to 180mm, and specifically can be set to be 120mm, 140mm, 160mm or 180mm and the like; a fourth anti-corona layer 132 is then half-folded over the whole slot region S1 of the bar body 110, the third and fourth anti-corona layers 131, 132 together forming the first anti-corona structure 130 of the slot region S1 of the bar body 110.
The third corona-preventing layer 131 and the fourth corona-preventing layer 132 are low-resistance corona-preventing layers, and have a resistivity of 100 Ω · m or more and 10000 Ω · m or less, and in an actual manufacturing process, the resistivity can be set to 100 Ω · m, 2000 Ω · m, 5000 Ω · m, 8000 Ω · m, 10000 Ω · m, or the like. The thicknesses of the third corona prevention layer 131 and the fourth corona prevention layer 132 are respectively greater than or equal to 0.05mm and less than or equal to 0.15mm, and can be set to 0.05mm, 0.07mm, 0.09mm, 0.12mm, 0.15mm, or the like in the actual manufacturing process.
After the first corona prevention structure 130 is bound, half-overlapping a first corona prevention layer 141 at the position of the end part area S2 of the wire rod body 110 close to the groove part area S1, so that the first corona prevention layer 141 is lapped on the fourth corona prevention layer 132, and the lapping length is 20 mm; then, a first anti-corona section 1421 is half-overlapped on the end region S2, so that the first anti-corona section 1421 covers the first anti-corona layer 141, and the overlapped region of the first anti-corona section 1421, the first anti-corona layer 141, the third anti-corona layer 131 and the fourth anti-corona layer 132 forms the overlapping region 150 together, that is, the overlapping region 150 includes the third anti-corona layer 131, the fourth anti-corona layer 132, the first anti-corona layer 141 and the first anti-corona section 1421 which are arranged in sequence.
The first corona prevention layer 141 and the first corona prevention section 1421 are medium resistance corona prevention layers, and have a resistivity of 1M Ω · M or more and 1000M Ω · M or less, and in an actual manufacturing process, the resistivity thereof can be set to 1M Ω · M, 100M Ω · M, 500M Ω · M, 800M Ω · M, 1000M Ω · M, or the like. The thicknesses of the first anti-corona layer 141 and the first anti-corona section 1421 are respectively greater than or equal to 0.15mm and less than or equal to 0.25mm, and can be set to 0.15mm, 0.18mm, 0.2mm, 0.23mm, 0.25mm, or the like in an actual manufacturing process.
After the first corona-proof section 1421 is wrapped, a second corona-proof section 1422 is further wrapped in half at the end region S2 of the bar body 110, so that the second corona-proof section 1422 overlaps the first corona-proof section 1421, and the overlapping length is 20 mm. Then, the end region S2 of the wire rod body 110 is further wrapped with a layer of the third corona prevention section 1423 in a half-lap manner, so that the third corona prevention section 1423 overlaps the second corona prevention section 1422, and the overlapping length is 20 mm. The first, second and third anti-corona sections 1421, 1422 and 1423 together form a second anti-corona layer 142, and the second anti-corona layer 142 and the first anti-corona layer 141 form a second anti-corona structure 140.
The second corona shielding section 1422 is a medium/high resistance corona shielding layer, and has a resistivity of 10M Ω · M or more and 10000M Ω · M or less, and in an actual manufacturing process, the resistivity can be set to 10M Ω · M, 100M Ω · M, 1000M Ω · M, 5000M Ω · M, 10000M Ω · M, or the like. The third corona prevention section 1423 is a high resistance corona prevention layer having a resistivity of 10 or more3M omega M is less than or equal to 106M.OMEGA.. M, the resistivity of which can be set to 10 in the actual production process3MΩ·m、104MΩ·m、105M.OMEGA.m or 106M.OMEGA.m.
The thicknesses of the second corona prevention section 1422 and the third corona prevention section 1423 are respectively greater than or equal to 0.15mm and less than or equal to 0.25mm, and in an actual manufacturing process, the thicknesses can be set to 0.15mm, 0.18mm, 0.2mm, 0.23mm, 0.25mm, or the like.
After completing the wrapping of the first and second anti-corona structures 130 and 140, an anti-corona protection layer 160 is wrapped at the end region S2 of the line bar body 110, that is, an anti-corona protection layer 160 is wrapped on the surface of the second anti-corona structure 140 to protect the second anti-corona structure 140. And then the stator bar 100 is placed in a mould for hot-pressing, curing and forming, so that the first corona-proof structure 130, the second corona-proof structure 140 and the corona-proof protective layer 160 are tightly attached to the bar body 110.
After hot-press curing molding, a layer of second anti-corona paint 180 is coated on the groove part area S1 of the wire rod body 110, that is, a layer of second anti-corona paint 180 is coated on the surface of the first anti-corona structure 130, and then the second anti-corona paint 180 is cured at room temperature for 24 hours or cured at 110 ℃ for 6 hours, so that the second anti-corona paint 180 is cured and molded. And then coating a layer of first anti-corona paint 170 on the end region S2 of the wire rod body 110, namely coating a layer of first anti-corona paint 170 on the surface of the second anti-corona structure 140, and then curing the first anti-corona paint 170 at room temperature for 24 hours or baking and curing the second anti-corona structure at 110 ℃ for 6 hours to cure and shape the first anti-corona paint 170.
After the first corona-proof paint 170 and the second corona-proof paint 180 are manufactured, a layer of arc-resistant red enamel is coated on the end portion area S2 of the wire rod body 110, namely, a layer of arc-resistant red enamel is coated on the surface of the first corona-proof paint 170, and then the arc-resistant red enamel is cured for 48 hours at room temperature, so that the arc-resistant red enamel is cured and molded, and the stator wire rod 100 is manufactured.
This application embodiment is through range upon range of third anticorona layer 131, fourth anticorona layer 132, first anticorona layer 141 and the first anticorona section 1421 that sets up in overlap joint area 150 to form low resistance anticorona structure binary channels and high resistance anticorona structure binary channels at overlap joint area 150, can improve overlap joint area 150's current-carrying capacity, avoid overlap joint area 150 high temperature ablation phenomenon to appear, improve stator bar 100's life. Wherein the corona inception voltage of the stator bar 100 is increased from 1.5Un to 3.0Un, the flashover voltage of the stator bar 100 is increased from 90kV to 130kV, and the temperature rise of the end region S2 of the stator bar 100 in the high-voltage test process 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.
The stator includes a stator bar 100 and a stator core, the stator core is connected with a slot region S1 of the stator bar 100, and the stator core is a main magnetic circuit of the stator and is also a mounting and fixing component of the stator bar 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 using specific examples, which are merely provided 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 structure is coated on the main insulating layer at a position corresponding to the groove part area;
the second anti-corona structure is coated on the main insulating layer at a position corresponding to the end part area, and the resistivity of the second anti-corona structure is greater than that of the first anti-corona structure; the second anti-corona structure comprises a first anti-corona layer and a second anti-corona layer which are arranged in a stacked mode;
the second anti-corona structure edge is partially overlapped with the first anti-corona structure edge to form an overlapping area; the lap joint region comprises the first anti-corona structure, the first anti-corona layer and the second anti-corona layer which are arranged in a stacked mode.
2. A stator bar in accordance with claim 1, wherein said overlap region comprises said first corona protection structure, said first corona protection layer and said second corona protection layer disposed in sequence in a direction away from said primary insulation layer.
3. A stator bar in accordance with claim 1, wherein said second anti-corona layer covers said first anti-corona layer; the resistivity of the second anti-corona layer is greater than the resistivity of the first anti-corona layer.
4. A stator bar in accordance with claim 1, wherein said first anti-corona structure comprises third and fourth anti-corona layers disposed in a stack, said overlap region comprising said first, second, third and fourth anti-corona layers disposed in a stack.
5. A stator bar in accordance with claim 4, wherein said overlap region comprises said third anti-corona layer, said fourth anti-corona layer, said first anti-corona layer and said second anti-corona layer disposed in that order along and away from said primary insulation layer; or the like, or, alternatively,
the lap joint region comprises the third anti-corona layer, the first anti-corona layer, the fourth anti-corona layer and the second anti-corona layer which are sequentially arranged along the direction far away from the main insulating layer; or the like, or, alternatively,
the lap joint region comprises a first anti-corona layer, a third anti-corona layer, a fourth anti-corona layer and a second anti-corona layer which are sequentially arranged along the direction far away from the main insulating layer.
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 sequence along a region remote from the slot portion.
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 anti-corona protective layer is coated on the second anti-corona structure;
the first anti-corona paint is coated on the anti-corona protective layer;
and the second anti-corona paint is coated on the first anti-corona structure.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210060963.5A CN114400814A (en) | 2022-01-19 | 2022-01-19 | Stator bar, stator and generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210060963.5A CN114400814A (en) | 2022-01-19 | 2022-01-19 | Stator bar, stator and generator |
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| Publication Number | Publication Date |
|---|---|
| CN114400814A true CN114400814A (en) | 2022-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210060963.5A Pending CN114400814A (en) | 2022-01-19 | 2022-01-19 | Stator bar, stator and generator |
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| Country | Link |
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| CN (1) | CN114400814A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024051207A1 (en) * | 2022-09-06 | 2024-03-14 | 东方电气集团东方电机有限公司 | Temperature measuring apparatus and generator stator |
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2022
- 2022-01-19 CN CN202210060963.5A patent/CN114400814A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024051207A1 (en) * | 2022-09-06 | 2024-03-14 | 东方电气集团东方电机有限公司 | Temperature measuring apparatus and generator stator |
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