摘要
利用发电机内部故障暂态仿真程序,分析了几种水轮发电机主保护的原理特性,指出它们在应用中存在的问题.指出故障分量负序功率方向保护能同时反映各种不对称故障,可使发电机匝间短路保护实现双重化;微机型负序方向闭锁式转子二次谐波电流保护由于能很好地解决闭锁元件和动作元件之间的时间配合,将能有效避免外部短路时的误动作,同时它在发电机起、停过程中也能提供保护功能,因此是一种性能可靠的发电机主保护方案.同时,提出了基于双曲线非线性制动特性的发电机差动保护判据,该方法计算量小,而且无须进行区段判别,能够获得较为理想的制动特性.
The transient process simulation software is an important tool for developing new protection principles and verifying the protection schemes. The mathematical model based on branches for analyzing the salient generator with internal fault was established. The rule of the internal fault was induced. The different faults were compared to find their influence to the protection principle of the generator and some countermeasures were presented. Based on the fault simulation data, the paper presented the theoretical analysis and their application for several protection schemes. To obtain higher restraint quantity than the conventional ratio-restraint criterion, a new protection criterion with characteristic of non-linear restraint was developed. At last, the main protection scheme for large hydro-generator was suggested.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2006年第3期532-538,共7页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金资助项目(50577042)
关键词
大型水轮发电机
内部故障
主保护
横差保护
large hydro-generator
internal fault
main protection scheme
transverse differential protection
