电动机起动时电压暂降计算方法的推导

Derivation of Voltage Sags Calculation Method at Starting of Electric Motor

在石油化工电气工程设计中,电动机起动时系统中的电压暂降是选择电动机起动方式和校验起动设备过负荷能力的依据和前提,但相关设计手册中的计算公式有所差别。通过两种方法推导了电动机起动时母线电压相对值的计算公式,以供相关设计人员参考。

In petrochemical electrical engineering design, calculating the voltage sag in the distribution system when starting the motor is the basis and premise for selecting the motor starting mode and checking the overload capacity of the starting electrical appliance, but the calculation formulas in the related design manuals are different. The calculation formula of the relative value of the bus voltage in the starting of the motor was derived by two methods, which was for the reference of the relevant designers.