2×150MW发电机端部绕组松动及电晕的处理

2 × 150 MW generator ends winding loose and corona treatment

华电四川发电有限公司攀枝花分公司2×150 MW机组发电机定子绕组端部受固定结构件、绑扎绳、支撑环及支撑板等部分松动的影响,定子绕组表面电位分布不均匀,在较高电压下,局部电位梯度过大,绕组端部固定及绑扎时存在的尖端及毛刺等发生放电。为了延长发电机安全运行寿命,对发电机定子端部绕组进行了防晕处理。通过长期运行监视及在线监测发电机定子绕组局部放电,及时评估发电机定子绕组的绝缘状态,提前发现故障早期征兆,避免了恶性事故的发生。经过4年运行检验,改造取得了良好效果。

Panzhihua Power Plant 2 × 150 MW generator stator winding end part bearing fixing structure,lashing rope and a su-pport ring and supporting plate loosening effect,stator winding surface potential distribution is not uniform,in the high voltage,resulting in the big local potential gradient winding end part fixed and banding of tip and burr discharge phenomenon. In order to improve the life safety operation of generator,generator stator end winding were processed,and used the Harbin motor factory research obtains the reliable anti corona technology and anti corona treatment experience of winding of corona treatment,to take measures and through long- term monitoring on line partial discharge monitoring of generator stator winding insulation,can timely evaluation the state of generator stator winding fault,found early signs of early,to avoid the occurrence of accidents.After four years of operation,has achieved remarkable results.