发电机进相运行时失磁保护动作特性分析

Analysis on the Characteristics of Protection Action for the Loss of Excitation Protection during Generator Leading Phase Operation

分析了发电机失磁保护阻抗判据的特点,提出了将发电机低励限制曲线转化为阻抗平面的方法,以及阻抗平面上阻抗圆与低励限制曲线的配合关系,分析进相试验时机端测量阻抗的轨迹与阻抗圆之间的关系,提出进相试验时,防止失磁保护误动的方法。

The criterion of the loss of excitation in generators is analyzed in the paper, and the method for the transformation of low excitation limit curve to impedance plane as well as the relationship between impedance circle on the impedance plane and low excitation limit curveisproposed in thepaper. Based on the analysis oftherelationship between the trackofimpedanee measured during the leading phase experiment and the impedance circle, the method to avoid malfunction is provided.