YKK系列中型高压电机起动特性的计算

摘要

In order to obtain accurately the starting characteristics and starting period of medium-sized motors with high-voltage in YKK series and to determine the influence of the motors in starting on power grid, the dynamic mathematical model of three-phase induction motor was established based on the M-T coordinate system. The calculating method for stating characteristics of the motors was improved. Combined with the actual load data the starting characteristics of the motors in YKK series were calculated and the impact on motors when it reduced voltage starting were analyzed. Compared with the characteristic curve obtained by calculating method in steady state, dynamic characteristic curve accurately tallies with the actual situation. Calculation results provide more accurate references for designing and improving the medium-sized motors with high-voltage in YKK series and determine start-up mode.%为了准确计算YKK系列中型高压电机的起动特性和起动时间以确定电机起动过程对电机本身和电网产生的影响,在M-T坐标系下建立了三相感应电动机的动态数学模型,并对电机起动特性的计算方法进行了改进.结合电机所带实际负载数据,对新型YKK系列电机的起动特性和起动时间进行了计算,分析了降压起动对电机产生的影响.计算结果表明:得到的动态特性曲线与用稳态计算方法所得到的特性曲线相比,在某些区段存在明显不同,分析可知动态特性曲线更符合实际情况.计算结果为设计和改进YKK系列中型高压电机及确定其起动方式提供了更准确的参考依据.