摘要：比较了同步发电机和变压器电压调整率Δu的同异，解释了产生差异的原因。Δu定义形式相同为它们的共同点。差异点有五点：1）变压器的Δu有额定、非额定之分；而同步发电机的Δu只有额定。2）Δu定义的状态过渡方向不同。3）Δu计算式不同。4）变压器的Δu可以等于零，而同步发电机的Δu则不可能等于零。5）额定Δu的数值，变压器的较小，同步发电机的较大。
关键词：电压调整率；同步发电机；变压器

Abstract:  The commons and differences of voltage regulation rates Δu between synchronous generators and transformers were compared in this paper, with causes of producing differences explained. The commons is at one point: Δus definition style. The differences are at five points: 1 ) Transformers Δu has both the rated and the nonrated; but the synchronous generators Δu only has the rated one.  2 ) The state transition direction in Δu definitions are different. 3 ) Δus computation formula are different. 4 ) Transformers Δu can be zero, but synchronous generators Δu cannot be. 5 ) As to the values of the rated Δu, the transformers is larger than the synchronous generators.
Key words:  voltage regulation rate; synchronous generator; transformer