高压电动机负序电流的产生及其保护整定

Generation and Protection Setting Analysis for Negative-Sequence Current in High-Voltage Motor

分析了实际运行中异步电动机负序电流产生的几种典型情况,分析了负序电流对电动机本身和对保护装置的影响,结合实际运行经验,提出了在起动与正常运行时分开整定、采用定时限延时动作的合理可行的负序电流保护整定计算方法。

Several typical cases of negative-sequence current produced in asynchronous motors which are in practical running are analyzed. The effects of the negative-sequence current to the asynchronous motor itself are also researched. Based on the actual operation experiences, a reasonable and feasible calculating method for the protection setting of negative-sequence current, which can be applied for the separate tuning between the starting and normal running and the fixed time-limit delaying operation, is proposed.