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Arc extinction brush and method for eliminating electric arc of power generator with this arc-extinction brush

A generator and arc suppression technology, applied to circuits, current collectors, electrical components, etc., can solve problems such as poor oxide film, unfavorable brush operation, and inability to help form oxide film, etc., to achieve the effect of convenient use and no impact on production

Inactive Publication Date: 2008-08-06
黄继林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two existing methods have their limitations and deficiencies when solving the problems caused by poor oxide film (especially when large generators fail).
[0004] "Impregnation" refers to dipping and mixing some special substances into the brush during manufacturing to help the brush to easily form an oxide film during operation, but in the actual working process, it is difficult to grasp the content of the impregnated and mixed substances
This is because: (1) If the content is too large, then a thicker and thicker oxide film will be formed, which will continue to form when it is not needed, which is not good for the operation of the brush; The speed of film formation is lower than the removal speed of oxide film, and the oxide film is too thin, especially when the oxide film is destroyed, it cannot help to form a good oxide film
(2) Under actual operating conditions, there is no suitable content of impregnated and mixed substances, and a good oxide film can be formed as required under any circumstances
The present invention can generally solve or have a good effect on sparks, flames, flashing, arcing, arcing and flashover that occur in the initial stage of brush failure; and for rapid deterioration to severe ring fire and even arc short circuit, large generator sets It will protect the action from tripping, and the present invention will not be able to handle it

Method used

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  • Arc extinction brush and method for eliminating electric arc of power generator with this arc-extinction brush

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0047] (1) The first embodiment: splashing sparks occur during the operation of a large generator slip ring brush (4 rows of single poles, 10 pieces in each row, and the sliding apparent area of ​​a single brush is 2.5×3.2=8 square centimeters) (production site It is called "flaming"), and the human eyes observed that the intermittent transfer of the flames was irregular, but the fault did not seriously deteriorate. After 35 days of the flames, the on-site staff did not get better.

[0048] The composition (weight) ratio of the arc suppression brush used in this example is 1% tin, 20% wax, and 79% molybdenum disulfide. Use this arc suppression brush to help and promote the rapid formation of oxide film, increase the sliding contact resistance, and establish the contact voltage drop required for normal operation. In this embodiment, the first predetermined time is 1 to 3 seconds, and the second predetermined time It took 1 to 3 hours. After three times of operation, the fire wa...

no. 2 example

[0049] (2) The second embodiment: in a large unit (but not the same unit as above), the current of the slip ring brush is seriously uneven during operation, which causes the brush braid to overheat, discolor and burn out: several (not more than 10) brushes are burned every day The brush braid, and which brush is blown is irregular in time and space, regardless of the size of the new brush and the old brush, and the contact surface size, and is even insensitive to the pressure of the compression spring. After more than 10 days of treatment, there is no improvement.

[0050] The composition (weight) ratio of the arc suppression brush used in this example is 1% tin, 29% wax, and 70% molybdenum disulfide. With this arc-suppressing brush, the 6 faults were completely eliminated in the same way as the above example, and it has been running normally since then.

[0051] (3) The third embodiment (self-vibration of brush sliding friction): a large-scale generator slip ring has four ro...

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Abstract

The present invention relates to an arc extinction brush, comprising a solid mixture brush body, wherein, the solid mixture brush body consists of a solid lubricant, wax, and a fast film formation substance; the solid lubricant is any of tin, lead, indium, cadmium, silver and oxides thereof; the fast film formation substance is any of molybdenum disulfide, tungsten disulfide, silver iodide, lithium carbonate, barium carbonate or sodium silicate. The present invention also comprises a method of using the arc extinction brush to eliminate electric arc of brushes for generators. The arc extinction brush is used to replace a brush to participate in motor operation and is matched with the operation of eliminating a bad oxide film, and after the arc extinction brush is repeatedly put into operation, the arc extinction brush can help form a good oxide film, so as to eliminate electric arc of brushes for generators and to reduce the sliding friction and self-vibration of brushes.

Description

technical field [0001] The invention relates to a device and method for eliminating brush arcs for generators, in particular to a device and method for brush arcs for large generators, and can also be used for reference for small motors and exciter commutators. Background technique [0002] During the operation of large generator sets, the brushes slide relatively on the slip ring. There is a layer of oxide film between the contact surface of the brush and the metal slip ring. This layer of oxide film not only determines the "contact voltage barrier" in the operation of the brush, but also determines the conduction mechanism and current distribution of the brush. For the coefficient of sliding friction, Wear, vibration, etc., also matter. Poor oxide film during operation will cause abnormal operation of the brush, such as: (1) The current is seriously uneven, causing the brush braid to heat up and even burn out (multiple groups, or a group of multiple brushes with serious c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R39/20H01R43/14
Inventor 黄继林
Owner 黄继林
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