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Serial Failure Diagnosis of a Transmission Line Protection Relaying System by Petri Nets

Journal of Systems Engineering and Electronics 2001年第1期12卷 59-64页

作者： Zhang Zhiming Wang Yue Tao Ran &Zhou Siyong Dept. of Electronics Engineering, Beijing Institute of Technology, 100081, P. R. China Dept. of Electronics Engineering Beijing Institute of Technology 100081 P. R. China

With the development of large-scale complicated modern power systems, the requirement for the associated protection scheme tends to be more stringent and its combination more complex. However, it is very difficult to figure out the factors of failure of such systems. This paper proposes a Petri net model of a transmission line protection relaying system, including three types of relays as well as an automatic reclosing device, and shows how to diagnose serial failure of the system by analyzing invariant sets of the model. Furthermore, it gives four basic types of failure sequences and its execution is much more intuitive and effective than the traditional method.

关键词： electric fault location electric power system protection electric relays Failure analysis Mathematical models Petri nets Relay protection

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Study on Missile Intelligent fault Diagnosis System Based on Fuzzy NN Expert System

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Journal of Systems Engineering and Electronics 2001年第1期12卷 82-87页

作者： Yang Jun Feng Zhensheng Zhang Xien & Liu Pengyuan Dept. of Missile Engineering, Ordnance Engineering College, Shijiazhuang 050003, P. R. China Dept. of Missile Engineering Ordnance Engineering College Shijiazhuang 050003 P. R. China

In order to study intelligent fault diagnosis methods based on fuzzy neural network (NN) expert system and build up intelligent fault diagnosis for a type of missile weapon system, the concrete implementation of a fuzzy NN fault diagnosis expert system is given in this paper. Based on thorough research of knowledge presentation, the intelligent fault diagnosis system is implemented with artificial intelligence for a large-scale missile weapon equipment. The method is an effective way to perform fuzzy fault diagnosis. Moreover, it provides a new way of the fault diagnosis for large-scale missile weapon equipment.

关键词： Artificial intelligence electric fault location Expert systems Fuzzy sets Missiles Neural networks

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