一种单根定子线棒结构
By setting up a multi-layer anti-corona structure on the stator bars, the problem of excessively concentrated electric field distribution was solved, the electric field was made more uniform and the current carrying capacity was improved, thus ensuring the safety and reliability of the hydro-generator.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA YANGTZE POWER
- Filing Date
- 2025-07-29
- Publication Date
- 2026-07-17
AI Technical Summary
In the existing technology, after the stator bars have undergone anti-corona treatment with the main insulation layer, inner shielding layer and outer shielding layer, when the highest potential point becomes stable, the electric field distribution becomes too concentrated, leading to partial discharge and corona phenomenon. This may produce corrosive gases such as ozone and nitrogen oxides, which can damage the insulation materials and even cause short circuits or open circuits in the motor.
The design employs a multi-layer anti-corona structure, including a low-resistivity anti-corona layer, an inner shielding layer, a middle shielding layer, and an outer shielding layer. The resistivity gradually increases, forming a multi-channel structure that homogenizes the electric field at the ends of the stator bars and reduces the risk of partial discharge.
The multi-layer anti-corona structure design improves the current-carrying capacity of the stator bars, avoids excessive electric field concentration, reduces the risk of temperature rise and partial discharge, and ensures the safety and reliability of the hydro-generator.
Smart Images
Figure CN224520810U_ABST
Abstract
Claims
1. A single stator bar construction characterised in that, include: The conductor (10) has a groove region and an end region connected sequentially along the extension direction of the conductor (10); The main insulation layer (1) covers the surface of the conductor (10); The first anti-corona structure includes a low-resistance anti-corona layer (2), which covers the main insulation layer (1) at the position corresponding to the groove area; The second anti-corona mechanism is covered on the position corresponding to the end area of the main insulation layer (1), and the resistivity of the second anti-corona mechanism is greater than that of the first anti-corona structure. The second anti-sunshine mechanism includes an inner shielding layer (11), a middle shielding layer (12), and an outer shielding layer (13) that are sequentially overlapped and have increasing resistivity. The inner shielding layer (11) overlaps the edge portion of the first anti-sunshine structure, the middle shielding layer (12) overlaps the edge portion of the inner shielding layer (11), and the outer shielding layer (13) overlaps the edge portion of the first anti-sunshine structure and wraps around the middle shielding layer (12) and the outer shielding layer (13).
2. A single stator bar construction according to claim 1, characterised in that, The resistivity of the first anti-corona structure is greater than that of the main insulating layer (1).
3. A single stator bar construction according to claim 2, characterised in that, The inner shielding layer (11) includes a medium-resistance anti-corona layer (3), a medium-high resistance anti-corona layer (4) and a high-resistance anti-corona layer (5) arranged sequentially along the extension direction of the conductor (10).
4. A single stator bar construction according to claim 3, characterised in that, The resistivity of the medium-resistance anti-corona layer (3), the medium-high resistance anti-corona layer (4) and the high resistance anti-corona layer (5) gradually increases, and the resistivity of the medium-resistance anti-corona layer (3) is greater than that of the first anti-corona structure.
5. A single stator bar construction according to claim 4, characterised in that, One end of the medium-resistance anti-corona layer (3) overlaps the edge of the first anti-corona structure, and the other end of the medium-resistance anti-corona layer (3) is wrapped around the main insulation layer (1). One end of the medium-high resistance anti-corona layer (4) overlaps the edge of the medium resistance anti-corona layer (3) away from the first anti-corona structure, and the other end of the medium-high resistance anti-corona layer (4) is wrapped around the main insulation layer (1). One end of the high-resistance anti-corona layer (5) overlaps the edge of the medium-high resistance anti-corona layer (4) away from the medium resistance anti-corona layer (3), and the other end of the high-resistance anti-corona layer (5) is wrapped around the main insulation layer (1).
6. A single stator bar construction according to claim 5, characterised in that, The central shielding layer (12) includes a second-highest resistance anti-corona layer (6) and a higher resistance anti-corona layer (7) arranged sequentially along the extension direction of the conductor (10).
7. A single stator bar construction according to claim 6, characterised in that, The resistivity of the second-highest resistivity anti-corona layer (6) and the higher resistivity anti-corona layer (7) gradually increases, and the resistivity of the second-highest resistivity anti-corona layer (6) is greater than that of the higher resistivity anti-corona layer (5).
8. A single stator bar construction according to claim 7, characterised in that, The second-high resistance anti-corona layer (6) is wrapped around the high resistance anti-corona layer (5). One end of the higher resistance anti-corona layer (7) overlaps the edge of the high resistance anti-corona layer (5) away from the middle-high resistance anti-corona layer (4). The other end of the higher resistance anti-corona layer (7) is wrapped around the main insulation layer (1). The higher resistance anti-corona layer (7) covers both the edge of the high resistance anti-corona layer (5) and the edge of the second-high resistance anti-corona layer (6).
9. A single stator bar construction according to claim 8, characterised in that, The outer shielding layer (13) includes an additional insulating layer (8) with gradually increasing resistivity and an ultra-high resistance anti-corona layer (9), and the resistivity of the additional insulating layer (8) is greater than that of the higher resistance anti-corona layer (7).
10. A single stator bar construction according to claim 9, characterised in that, One end of the additional insulation layer (8) overlaps the first anti-corona structure edge portion, the other end of the additional insulation layer (8) is wrapped on the main insulation layer (1), and the additional insulation layer (8) wraps the middle shielding layer (12) and the inner shielding layer (11); One end of the extra-high resistance anti-corona layer (9) overlaps the first anti-corona structure edge portion, the other end of the extra-high resistance anti-corona layer (9) is wrapped on the main insulation layer (1), and the extra-high resistance anti-corona layer (9) wraps the additional insulation layer (8).