适合旋转励磁式同步发电机的主保护方案

本文提出了一种适合旋转励磁式同步发电机的主保护方案，利用定子负序功率方向作为保护的主判据，定于三次谐波正序电压为辅助判据，能正确反映发电机定于绕组各种不对称短路和断线故障．采用微机故障分量原理后，保护各方面性能较传统保护有了显著的提高．由于采用了两重“与”判据、具有较高的可靠性．本文讨论了保护判据和算法的实现．给出了初步动模试验的结果并进行了分析，还对保护软硬件结构进行了阐述．微机装置在华中理工大学动模实验室进行了全面的动模试验并于１９９３年７月２８日在湖北省汉川电厂２＃３００ＭＷ汽轮发电机组上投人试运行．

A MEW MAIN PROTECTION SCHEME FOR EXCITER-REVOLOING GENERATORS WITH MICRO-COMPUTER

This paper presents a new main protection scheme for exciterrevolving generators based on the fault component. There are two criteria in this scheme. The dircction of stator negative current and voltage is suggested as the main criterion of protection, and the stator positive third harmonic voltage as the tional criterion. the laboratry physical test shows that, when various asymmetrical faults occur inside the generator, the stator positive third harmonic voltage changed remarkably after passing throrgh the analogue filters, and so the new protection scheme can keep higher sensitivity. In addition, the protection scheme uses more than one criterion and the reliability is better. This paper presents the algorithms of the scheme, the constructure of the soft ware for the implementation, and some results of the laboratry physical test. This new protection scheme is suit not only for the exciter-revolving generators, but also for various synchronous genarators.