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Corona discharge suppression method and structure of generator stator bar and generator

A generator stator and corona discharge technology, which is applied to the shape/style/structure of winding insulation, electromechanical devices, electrical components, etc., can solve the problems that corona discharge cannot be effectively suppressed, and achieve the benefits of anti-corona performance, The field strength distribution is even and the effect of ensuring stable operation

Active Publication Date: 2022-03-15
SOUTHERN POWER GRID PEAK LOAD & FREQUENCY REGULATION GENERATING CO LTD +1
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AI Technical Summary

Problems solved by technology

In view of this, in the prior art, the outer surface of the main insulation of the wire rod is generally wound or painted with a shielding layer with electric field suppression ability. However, although this shielding layer has a certain field strength suppression effect, it cannot effectively suppress the corona discharge phenomenon.

Method used

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  • Corona discharge suppression method and structure of generator stator bar and generator
  • Corona discharge suppression method and structure of generator stator bar and generator
  • Corona discharge suppression method and structure of generator stator bar and generator

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Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0035] See figure 1 and Figure 4 , the first embodiment of the present invention provides a method for suppressing corona discharge of a generator stator bar, including:

[0036] A low-resistance shielding layer 3 is arranged outside the main insulating layer 2 of the wire rod conductor 1 and in the groove of the iron core 5; wherein, the lower surface of the low-resistance shielding layer 3 is bonded to the main insulating layer 2, and the low-resistance shieldi...

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Abstract

The invention discloses a corona discharge suppression method and structure of a generator stator bar and a generator. The corona discharge suppression method comprises the steps that a low-resistance shielding layer is arranged outside a main insulating layer of a bar conductor and in an iron core groove; wherein the lower surface of the low-resistance shielding layer is attached to the main insulating layer, and the upper surface of the low-resistance shielding layer is in contact connection with the iron core; and a high-resistance shielding layer is arranged in the middle of the upper surface of the low-resistance shielding layer. According to the embodiment of the invention, the field intensity distribution on the surface of the coil bar can be greatly optimized, so that the field intensity peak value is reduced, the surface field intensity is more uniform, and the generation possibility of corona discharge is avoided or reduced.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a method for suppressing corona discharge of a stator bar of a generator. Background technique [0002] The stator part of a large hydroelectric generator is composed of a stator core and a stator coil. A large number of slots are evenly distributed on the inner circle of the stator core to embed the stator coil. The stator coil is embedded in the stator slot to form a three-phase winding. The stator coil structure is usually formed by connecting multiple stator bars end to end according to certain rules. The end of a single stator bar is located in the air outside the iron core, and the straight section of the middle part is embedded in the iron core slot. [0003] Generally, the field strength at the end of the stator bar is relatively concentrated. The higher the operating voltage, the greater the field strength at the end, and the easier it is to generate corona discharge. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K3/34H02K3/40
CPCH02K3/345H02K3/40
Inventor 聂靓靓陶诗迪黄明浩蒋军陈绪滨刘向东凌鹏黄文汉肖畅厉天威刘磊项阳李敏李斌唐力
Owner SOUTHERN POWER GRID PEAK LOAD & FREQUENCY REGULATION GENERATING CO LTD
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