Fault Analysis and Suggestion of Collector Ring and Brush of Generator

To strengthen the understanding of brush the surface oxidation film, created the premise of its cause and regular work: a recent several fault caused by the primary factor is because the brush surface oxidation film lubrication layer can not cause, oxidation of the membrane must be some preconditions, in accordance when the premise condition, the oxidation film can not cause or cause abnormal, first has the following several factors:  

(1) temperature: brush the oxide film is usually around 70 ℃ are more likely to cause, when the collector ring and brush overheating fault occurs, usually temperature above 150 ℃, then even if to replace the new brush, oxide film are also difficult to cause, not can play the lubrication effect, brush worn will aggravate, caused the temperature continues to rise, into a bad cycle.  At this time, external forced temperature reduction can be adopted, such as wiping vaseline, high-power fan ventilation and other ways, so that the collector ring temperature falls to the conventional area, continue for a certain period of time, so that the oxide film on the surface of the brush is gradually created, so that it enters a steady development situation. 

Fault Analysis and Suggestion of Collector Ring and Brush ofGenerator

(2) There are pollution debris in air cooling: debris in the air will bring adverse interference to the oxidation film on the surface of the brush. This kind of debris involves: corrosive waste gas of sulfide or halogen elements, mixture of oil and gas in the air, dust, iron filings, rust dust, charcoal and other debris.  When the brush is worn out, it will cause dust debris of carbon powder. Filtration facilities can be installed on the heat dissipation and ventilation circulation channel of the brush cover to improve the atmospheric quality of the brush cover.  

(3) The relative humidity of the air is too low or the oxygen content is too low: the oxidation film on the surface of the brush must be caused by the corresponding moisture composition in the air, that is, the relative humidity of the air can not be too low, but also can not be too high.  In addition, the oxide film is mainly caused by chemical interaction with oxygen in the air, and when the oxygen content is too low, it also damages the oxide film.  In addition to the above factors, there are also factors such as excessive grinding of brushes, scrubbing with solution, abnormal smoothness of collector ring surface and substandard carbon brush materials.  

Brush and brush rack products in the purchase link should be strictly controlled quality: at this stage of the same brand of brush, is not the same in each region, not the same factory processing.  This must we in the purchase link of product quality strict supervision, to manufacturers of processing technology and quality testing methods and processes to master.  

Strengthen the maintenance and management of collector ring and brush in production and operation: strengthen the full-time maintenance system of brush and collector ring system, improve the technical level of dedicated personnel, check, operate and maintain collector ring and brush strictly in accordance with the requirements of "operation regulations of steam turbine and generator sets", and strictly control the number of brush replacement at one time.  In addition, the infrared thermal imaging technology should be actively used to carry out daily inspection of collector ring and brush, and be used as an auxiliary analysis tool when there is doubt about the fault location.  

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