【摘要】 本文基于相似理论提出了一种新的观点：标幺值系统是有名值系统的相似系统，标幺值是可以具有单位的。因此，发电机的“机械惯性时间常数Ｔｊ”实质上是其转子转动惯量Ｊ的标幺值Ｊ＊，其单位应为Ｋｇ．ｍ２。更多还原

【Abstract】 Based on similarity theory, this paper presents a new viewpoint: the per unit system is similar to the real unit system, that is the per unit variables may have units; It has also been proven that so-called mechanical inertia time constant T J (Kg.m 2)is just the per unit value(J *) of generator rotor moment of inertia J.更多还原