基于导纳测量原理的隐极发电机失磁保护应用

摘要

介绍了我国传统发电机的失磁保护采用的阻抗判据,指出其存在缺乏直观性、与低励限制整定配合困难的缺点.介绍了基于导纳测量的失磁保护原理,鉴于导纳特性与发电机运行极限特性曲线的相似性,因此其具有物理意义清晰直观、易于整定、易于与励磁限制特性配合等优点.分析了基于导纳测量原理的失磁保护的整定原则,指出其与国内保护整定的不同之处,说明了将国内保护整定原则应用于基于导纳测量原理的失磁保护整定的合理性.结合工程实例给出了基于导纳测量原理的失磁保护的整定算例,并通过实际发电机进相试验过程验证了整定计算的正确性.%The traditional impedance criterion for the under-excitation protection of domestic generators is introduced,its deficiency in intuition and difficulty to cooperate with the setting of low excitation limit are pointed out,and the principle of under-excitation protection based on admittance measurements are explained,which is clear in physical significance,easy to set and convenient to cooperate with excitation limiting characteristics due to the similarity between the admittance characteristic and the operational limit curve of generator.The setting principle of the under-excitation protection based on admittance measurements is analyzed,its differences from that of domestic protections are pointed out,and the rationality of applying the setting principle of domestic protections to the under-excitation protection based on admittance measurements is illustrated.Its setting calculation for a practical project is given,the correction of which is verified by the leading-phase experiment for a real generator.