The electric power data network must make sure that the electric power system has high security , stabilization and efficiency . the information of schedular automatization , electricity energy collection , water instance measure , report and electricity network malfunction analysis requires very high security 电力数据网必须保证电力系统安全、稳定、高效生产的需要，其中调度自动化信息、电能量采集信息、水情测报信息和电网故障的分析等信息的安全性要求极高。
Along with the establishment of the information network for protective relaying and fault recorders , the plentiful recorded fault data lay a foundation for further diagnosis of the faults . according to the current operating situations of power systems and its evolution in the future , a new approach to carry out hierarchical fault diagnosis by using the collected messages is proposed 本人根据电力系统目前的实际运行情况和今后的发展，提出一种利用采集信息进行分层故障诊断的方法。对于复杂故障情况下利用故障处理系统进行研究，提出了虚拟保护的诊断思想，并建立相应的面诊断模型，有效地弥补了利用开关、保护诊断的局限性。
