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A manufacturing method of a stator bar for increasing the corona inception voltage of a winding

A technology of stator bar and corona inception voltage, which is applied in the shape/style/structure of winding insulation, winding insulation material, manufacturing of motor generators, etc. It is difficult to increase the gap between the oblique edges and other problems, so as to achieve the effect of simple repair method and implementation process, stable resistance value range and small resistance value range.

Active Publication Date: 2022-05-20
HARBIN ELECTRIC MASCH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The end of the stator bar of the traditional anti-corona structure uses medium-resistance and high-resistance anti-corona materials. Due to the high resistance of these materials, the surface potential at the end of the bar is very high, resulting in a potential difference between the different-phase bars. larger
At the same time, due to the relatively compact design of the winding end, it is difficult to increase the gap between the hypotenuses, which makes it difficult for the traditional anti-corona structure to adjust the electric field on the hypotenuse of the winding.

Method used

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  • A manufacturing method of a stator bar for increasing the corona inception voltage of a winding
  • A manufacturing method of a stator bar for increasing the corona inception voltage of a winding
  • A manufacturing method of a stator bar for increasing the corona inception voltage of a winding

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Embodiment Construction

[0021] 1) if figure 1 As shown, the anti-corona structure at the end of the stator bar, from the stator core 1 to the lead wire 2, is as follows: the first low-resistance anti-corona structure 3, the second medium-resistance anti-corona structure 4, the third low-resistance anti-corona Corona structure 5 and the fourth section of high-resistance anti-corona structure 6; the outermost layer of the end of the wire rod is covered with an additional insulating structure 7;

[0022] 2) if figure 1 As shown, the anti-corona materials of each anti-corona structure are: the low-resistance anti-corona tape material used in the first low-resistance anti-corona structure 3 and the third low-resistance anti-corona structure 5, with a width of 25mm and a thickness of 0.08mm 、The surface resistivity under 500V DC voltage is 10 2 Ω~10 3 Ω; the medium-resistance anti-halation belt material used in the second-stage medium-resistance anti-halation structure 4 has a width of 25mm, a thickness...

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Abstract

The invention discloses a manufacturing method of a stator bar for increasing the corona inception voltage of a winding. This kind of stator bar adds a low-resistance layer to the anti-corona structure at the end. Compared with the traditional anti-corona structure, it can effectively reduce the surface potential at the end of the bar, thereby reducing the potential difference between the winding bars and improving the winding capacity of the whole machine. The corona inception voltage level. The stator bar of this anti-corona structure has the characteristics of simple structure, convenient manufacture, remarkable effect and convenient repair. It can greatly increase the corona inception voltage level at the end of the winding and improve the The running stability of the winding.

Description

technical field [0001] The invention relates to the field of generator stator windings, in particular to a manufacturing method of a stator bar for increasing the corona inception voltage of the winding. Background technique [0002] During the operation of the stator winding of the generator, corona discharge phenomenon is prone to occur. This phenomenon will gradually corrode the main insulation material of the stator bar, cause a discharge channel and produce insulation holes, and in severe cases lead to insulation failure, which has a great impact on the operation safety of the unit. big threat. [0003] In the stator winding, due to the small gap between the hypotenuses and the large potential difference between the bars of different phases in the same layer, the electric field is very large during the test and operation, which is the weak part of the corona discharge in the winding. The end of the stator bar of the traditional anti-corona structure uses medium-resista...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K15/10H02K3/30H02K3/38H02K3/40
CPCH02K15/105H02K3/30H02K3/38H02K3/40Y02P80/30
Inventor 孙永鑫陶星明范寿孝冯超陈阳姜禹李伟刚
Owner HARBIN ELECTRIC MASCH CO LTD
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