大型发电机策机失步保护

Microcomputer-Based Out-of-step Relaying for Large Generators

对发电机失步及其保护作了分析,提出了监测机端视在阻抗,并在(?)-R平面预测发电机暂态稳定性的失步保护方案。该方案对外部线路故障,线路重合闸操作和发电机失磁等非正常运行情况采取了相应的防误动措施。结合本保护测量量的特点,本文采用基于两相电气量的曲线拟合算法编制保护软件,该软件的调试与保护功能数字仿真在IBM PC机上完成。

This article presents an approach to out-of-step of generator and protection against it. A protection scheme is proposed, based on detecting apparent impedance seen outward from generator terminal, and predicting transient stability on the R-R plane. Countermeasures against maloperation are adopted on occurring external line faults, autoreclosing and loss of excitation of generator and oth- er abnormal conditions. By use of curve fit algorithm with two phase quantities considering features of measured data, software of protection is developed, Digital simulation of relaying function and dubug- ging procedure are implemented on an IBM personal computer. Simulation result shows the protection meets engineering requirments.