中文摘要：

提出基于Petri网理论的地区电网故障分层诊断方法。根据变迁的发生及库所中托肯的转移得到稳态Petri网模型，最终确定故障元件。该方法采用图形化和解析式对电网故障诊断过程进行描述，实现具有信息预处理及启动检测、故障的检测、网络结构的更新、故障诊断、设备动作行为评价、人机交互等功能。并在局部电网中进行了诊断与分析验证。

英文摘要：

The stratified structure diagnostic method based on Petri net is proposed. The stable state Petri net model was established based on the variation of trigger firings and the shift of Tokens in the places, and the fault parts were determined. The method adopted graphical approach and analytic formula to describe the process of power grid fault diagnostic and difference between the simple and the complex fault Petri net models. The fault diagnostic system has features of information pretreatment and start examination, fault examination, grid architecture renewal, fault diagnosis, performance evaluation of the equipment and man-machine interactive.