大机组静态自并励励磁系统的短路电流特性分析

An Analysis of The Characteristic of The Short Circuit in The Large Capacity Generation Unit Static Shunt Self Excitation System

分析了 6 0 0MW机组全静态自并励励磁系统在发生机端三相短路时的暂态过程 ,得出自并励发电机短路电流在短路初始衰减比他励发电机慢 ,而后期又快 ,故而影响暂态过程中发电机的强励能力的结论 ,提出了应对的措施。

At present most 600MW generation units are equipped with static Shunt Self excitation system instead of the alternating exciter, which is simple in structure and more reliable. However, if is an out short circuit happens, the decrease of the short circuit of the Shunt Self generator will be slower than Shunt Self generator at the beginning, and during the second half time the decrease will become very fast which, the author suggests, may impair the excitation ability of the generator.