发电机伏赫兹限制与过激磁保护的配合整定研究

针对发电机自动励磁调节器中伏赫兹限制曲线的整定与发变组中过激磁保护曲线整定配合不尽合理的现象,分析了两者之间的动作特性以及过激磁保护经常配置的两套方案,根据相关理论和它们的功能推导出伏赫兹限制应优先于过激磁保护动作,归纳出了伏赫兹限制与定时限过激磁保护、反时限过激磁保护之间配合整定的原则。结合工程实例进行分析,指出在配合整定合理的情况下要考虑两者之间留有合理的级差来更好地保证发电机的安全。

Study on Coordination Setting of Generator V/Hz Limit and Over Excitation Protection

Aiming at unreasonable coordination issues of V/Hz limit curves setting in automatic voltage regulator of generator and over excitation protection curves setting in transformer unit, this paper analyzed the action features between the two settings and two plans of over excitation protection normal disposition. According to the related theory and their functions, this paper deduced that V/Hz limit should have priority before over excitation action, generalizing the coordination setting principle among V/Hz limit, time limit over excitation protection and inverse time limit over excitation protection. The engineering practical example analysis shows that under the conditions of reasonable coordination setting, a reasonable grade difference between the two settings should be kept to ensure the safety of generator better.