The principle of de-excitation of THYRIPOL exciter in the Three Gorges left-bank Hydro power Plant is introduced.

• 介绍了三峡左岸电厂THYRIPOL励磁装置的灭磁原理,详细分析了主要工况下的灭磁时序和试验录波资料,讨论了其灭磁可靠性等问题。