Low-resistance composite anti-corona structure of whole immersion motor stator winding

Abstract

The utility model belongs to the technical field of electrical insulation, and discloses a low-resistance composite anti-corona structure of a whole-immersed motor stator winding, which comprises a lead and a main insulating layer, the main insulating layer is arranged outside the lead, a first low-resistance semiconductor layer is arranged outside the main insulating layer, a second protective layer is arranged outside the first low-resistance semiconductor layer, and a third protective layer is arranged outside the second protective layer. According to the technical scheme of the utility model, the second protection layer is made of a detachable material, and when the low-resistance structure is subjected to concentrated stress, the third low-resistance semiconductor layer is damaged, the second protection layer is made of a detachable material, and the third low-resistance semiconductor layer is arranged on the outer side of the second protection layer. Therefore, the first low-resistance semiconductor layer and the third low-resistance semiconductor layer are timely separated, the integrity of the first low-resistance semiconductor layer is protected, and surface discharge is inhibited.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrical insulation, and in particular relates to a low-resistance composite anti-corona structure of a stator winding of an integrally immersed motor. Background Art

[0002] The stator winding of a high-voltage motor usually needs to adopt an anti-corona structure, and low-resistance anti-corona is an important part of it. At present, the stator winding of a fully immersed motor usually adopts a single-layer low-resistance anti-corona structure. For fully immersed units that are frequently started and stopped, the existing single-layer low-resistance anti-corona structure is easily damaged by the concentrated stress on the core slot during the frequent start-stop process. The main insulation surface exposed in the damaged area is prone to discharge under high voltage, resulting in electrical corrosion. Long-term electrical corrosion will cause the main insulation performance to deteriorate severely, leading to insulation failure, thereby generating surface discharge and further endangering the main insulation performance. Utility Model Content

[0003] The technical problem to be solved by the utility model is that the existing low-resistance anti-corona structure is prone to electrical corrosion, resulting in insulation failure, thereby generating surface discharge and further damaging the main insulation performance.

[0004] In order to solve the above technical problems, the technical solution of the utility model is to provide a low-resistance composite anti-corona structure for the stator winding of a whole-immersion motor, including a conductor and a main insulating layer, the main insulating layer is arranged on the outside of the conductor, a first low-resistance semiconductor layer is arranged on the outside of the main insulating layer, a second protective layer is arranged on the outside of the first low-resistance semiconductor layer, the second protective layer is a detachable material, and a third low-resistance semiconductor layer is arranged on the outside of the second protective layer.

[0005] By adopting the above technical solution, the second protective layer adopts a detachable material. When the low-resistance structure is subjected to concentrated stress and causes the third low-resistance layer to be damaged, the first low-resistance semiconductor layer and the third low-resistance semiconductor layer are separated in time to protect the integrity of the first low-resistance layer, thereby suppressing surface discharge.

[0006] Optionally, the length of the second protection layer is shorter than that of the first low-resistance semiconductor layer, and the length of the third low-resistance semiconductor layer is the same as that of the first low-resistance semiconductor layer.

[0007] Optionally, the first low-resistance semiconductor layer is half-wrapped on the outside of the main insulating layer, and the third low-resistance semiconductor layer is half-wrapped on the outside of the second protective layer.

[0008] Optionally, the second protective layer is sparsely wrapped around the outside of the first low-resistance semiconductor layer.

[0009] Optionally, the second protective layer is a conductive detachable material.

[0010] Optionally, the second protective layer is a polytetrafluoroethylene conductive tape.

[0011] Optionally, the second protective layer is an insulating detachable material, and a fourth semiconductor low-resistance layer is provided between the first low-resistance semiconductor layer and the second protective layer, and the fourth semiconductor low-resistance layer is made of the same material as the first low-resistance semiconductor layer.

[0012] Optionally, the second protective layer is a polytetrafluoroethylene tape.

[0013] In summary, the utility model has at least one of the following beneficial effects:

[0014] 1. The utility model adopts a detachable material for the second protective layer. When the low-resistance structure is subjected to concentrated stress and causes the third low-resistance layer to be damaged, the first low-resistance semiconductor layer and the third low-resistance semiconductor layer are detached in time to protect the integrity of the first low-resistance layer, thereby suppressing surface discharge.

[0015] 2. The conductive property of the second protective layer of the utility model ensures that even if the third low-resistance layer is damaged, the first low-resistance semiconductor layer is still effectively electrically connected to the wire, thereby eliminating discharge in the slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] In the figure: 1. Wire; 2. Main insulating layer; 3. First low-resistance semiconductor layer; 4. Second protective layer; 5. Third low-resistance semiconductor layer. DETAILED DESCRIPTION

[0018] The following combination Figure 1 The utility model is described in further detail.

[0019] The utility model discloses a low-resistance composite anti-corona structure for the stator winding of a fully immersed motor. Figure 1 , comprising a wire 1 and a main insulating layer 2, the main insulating layer 2 is arranged on the outside of the wire 1, a first low-resistance semiconductor layer 3 is arranged on the outside of the main insulating layer 2, the first low-resistance semiconductor layer 3 is half-wrapped on the outside of the main insulating layer 2, a second protective layer 4 is arranged on the outside of the first low-resistance semiconductor layer 3, the second protective layer 4 is sparsely wrapped on the outside of the first low-resistance semiconductor layer 3, the second protective layer 4 is a detachable material, a third low-resistance semiconductor layer 5 is arranged on the outside of the second protective layer 4, the third low-resistance semiconductor layer 5 is half-wrapped on the outside of the second protective layer 4;

[0020] The length of the second protection layer 4 is shorter than that of the first low-resistance semiconductor layer 3 , and the length of the third low-resistance semiconductor layer 5 is the same as that of the first low-resistance semiconductor layer 3 .

[0021] Example 1

[0022] In this embodiment, the second protective layer 4 is a conductive detachable material, such as a polytetrafluoroethylene conductive tape, and the second protective layer 4 is sparsely wrapped around the outer side of the first low-resistance semiconductor layer 3 .

[0023] Example 2

[0024] In this embodiment, the second protective layer 4 is an insulating detachable material, such as polytetrafluoroethylene tape, and a fourth semiconductor low-resistance layer is provided between the first low-resistance semiconductor layer 3 and the second protective layer 4. The fourth semiconductor low-resistance layer is made of the same material as the first low-resistance semiconductor layer 3.

[0025] In the utility model, the first low-resistance semiconductor layer 3 and the main insulating layer 2 are composited into one during the impregnation and curing process; the third low-resistance semiconductor layer 5 is tightly bonded to the conductor 1 during the impregnation and curing process to form a composite anti-corona structure;

[0026] During the frequent start-stop process, when concentrated stress appears in the low-resistance structure at the notch, causing the third low-resistance semiconductor layer 5 to be damaged, the detachment effect provided by the second protective layer 4 enables the first low-resistance semiconductor layer 3 to be detached from the damaged third low-resistance semiconductor layer 5 in time, thereby effectively preventing the transfer of stress and protecting the integrity of the first low-resistance semiconductor layer 3. At the same time, the conductive property of the second protective layer 4 ensures that even if the third low-resistance semiconductor layer 5 is damaged, the first low-resistance semiconductor layer 3 is still effectively electrically connected to the third low-resistance semiconductor layer 5, thereby eliminating discharge in the slot.

[0027] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A low-resistance composite anti-corona structure for the stator winding of a fully immersed motor, characterized in that: The invention comprises a conducting wire (1) and a main insulating layer (2), wherein the main insulating layer (2) is arranged outside the conducting wire (1), a first low-resistance semiconductor layer (3) is arranged outside the main insulating layer (2), a second protective layer (4) is arranged outside the first low-resistance semiconductor layer (3), the second protective layer (4) is a detachable material, and a third low-resistance semiconductor layer (5) is arranged outside the second protective layer (4).

2. The low-resistance composite anti-corona structure of the stator winding of the whole-immersion motor according to claim 1 is characterized in that: The length of the second protective layer (4) is shorter than that of the first low-resistance semiconductor layer (3), and the length of the third low-resistance semiconductor layer (5) is the same as that of the first low-resistance semiconductor layer (3).

3. The low-resistance composite anti-corona structure of the stator winding of the whole-immersion motor according to claim 1 is characterized in that: The first low-resistance semiconductor layer (3) is half-wrapped on the outside of the main insulating layer (2), and the third low-resistance semiconductor layer (5) is half-wrapped on the outside of the second protective layer (4).

4. The low-resistance composite anti-corona structure of the stator winding of the whole-immersion motor according to claim 3 is characterized in that: The second protective layer (4) is sparsely wrapped around the outside of the first low-resistance semiconductor layer (3).

5. The low-resistance composite anti-corona structure of the stator winding of the whole-immersion motor according to claim 1 is characterized in that: The second protective layer (4) is a conductive detachable material.

6. The low-resistance composite anti-corona structure of the stator winding of the whole-immersion motor according to claim 5 is characterized in that: The second protective layer (4) is a polytetrafluoroethylene conductive tape.

7. The low-resistance composite anti-corona structure of the stator winding of the whole-immersion motor according to claim 1 is characterized in that: The second protective layer (4) is an insulating detachable material, and a fourth semiconductor low-resistance layer is provided between the first low-resistance semiconductor layer (3) and the second protective layer (4), and the fourth semiconductor low-resistance layer is made of the same material as the first low-resistance semiconductor layer (3).

8. The low-resistance composite anti-corona structure of the stator winding of the whole-immersion motor according to claim 7 is characterized in that: The second protective layer (4) is a polytetrafluoroethylene tape.

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