大机组非全相运行对机组和系统安全运行分析

Analysis of Impact upon Safe Operation of Units and System from the Large Generator Incomplete Phase Operation

针对大型发电机组在不同的运行状态(空载、负载)下产生非全相运行,特别是发变组出口主断路器及联络线主断路器引起的非全相运行进行说明,并对其中3种情况进行发电机负序电流和发电机承受负序电流能力的计算;针对发电机发生非全相运行时负序电流对机组设备安全及运行安全的危害,以及发电机发生非全相运行时对系统的运行安全的威胁等进行分析;并针对各种情况下发电机非全相运行提出相应的处理措施,以确保机组和系统的运行安全和设备安全。

The incomplete phase operation of large generator under different operating condition （no load, on-load）, especially the incomplete phase operation caused by generator-transformer unit outlet main circuit breaker or tie feeder main circuit breeker was described. For the three cases of them, the negative sequence current in generator and whose endurance to it, were calculated. The harm of negative sequence current during the incomplete phase operation of generator towards the units equipment and the safe operation of the power system was analyzed. For the abnormality and accident caused by it, under each condition, the corresponding measures were proposed,to ensure the safe operation of units＇equipment and power system.