What is the voltage change rate of transformer?

调压器的电压变化率是变压器的主要性能指标之一。当变压器向负载供电时，在变压器的负载端的电压必然会下降，将下降的电压值与额定电压值相比，取百分数即电压变化率，可用公式表示；电压变化率=［(次级额定电压-负载端电压)/次级额定电压］×100%。通常的电力变压器，接上额定负载时，电压变化率为4～6%。

The voltage change rate of voltage regulator is one of the main performance indexes of transformer. When the transformer supplies power to the load, the voltage at the load end of the transformer is bound to drop. Compare the voltage drop value with the rated voltage value, take a percentage, that is, the voltage change rate, which can be expressed by the formula; the voltage change rate = [(secondary rated voltage load terminal voltage) / secondary rated voltage] × 100%. The voltage change rate of a common power transformer is 4-6% when it is connected to the rated load.