发电机碳刷发热的原因及处理方法

Causes and Treatment Methods for Heating of Generator Carbon Brush

某厂发电机组在运行过程中出现发电机励磁碳刷电流不均衡问题,碳刷电流和温度均偏高。经分析,造成碳刷电流不均衡的因素有碳刷自身品质不高、多种型号碳刷混用、碳刷运行过程中接触电阻增加等。对此,采取了更换高品质的同一型号同一批次碳刷、调整碳刷刷握弹簧压力、严格执行碳刷装配工艺等改进措施,并提出相应防范措施。改进后发电机励磁碳刷电流不均衡问题得到明显改善。

During the operation of generator set in a plant,there is the problem that the current of exciting carbon brush for generator is unbalanced as well as the current and temperature of carbon brush are high.The factors for unbalance of current for carbon brush are such as the low quality of carbon brush itself,mixed application of multiple-model carbon brushes and increase of contact resistance during operation of carbon brush through analysis.As a result,such improvement measures as replacing high-quality carbon brush with the same model and batch,adjusting spring pressure of brush holder for carbon brush as well as strictly implementing assembly process of carbon brush.Moreover,the corresponding preventive measures are put forward.After the improvement,the problem of unbalance of current for exciting carbon brush of generator is obviously improved.