Chen, Zejian (1995) Advanced microprocessor based intelligent relay for multifunction protection system. PhD thesis, Victoria University of Technology.

Abstract

Protective relay constantly monitors the power to assure maximum continuity of electrical service with minimum damage to life and property. Thus, they are on guard throughout - from the generation, through transmission, into distribution and utilisation. They are found in large and small systems, in the power companies and in most industrial installations. This wide usage, with high demands for reliable operation, has created a continuing desire for additional tasking. In power protection field, there have been many cases where protection theories and techniques have played an important role. With the progress of protection techniques, there are now many applications for protection with increased performance. However, applicable systems become increasingly complicated and highly composite. It is therefore expected that protection techniques will make further progress. The recent advancements of digital technology associated with the power industry has had further impact on development of power system protection equipment and techniques. The low cost, high performance microprocessor has led to their increasing use in digital relaying techniques. The 32-bit microcomputer boards with their high speed, high computing power, as well as its high level language feature, provides special possibilities of implementing an intelligent multi-function relay for substation protection system with the required speed, accuracy and reliability. The availability of microprocessor at economic cost has allowed a new concept of multi-function in the field of protection relays. The digital multi-function protective relay has capability of providing multi-tasking, multi-digital relaying function with high reliability and open-end facilities for integrating multi-protection schemes. For protective system improvement, such tasking is valuable not only to those directly responsible but also to the many others indirectly associated with protection techniques, such as fault detection, identification and diagnosis is currently a very important problem in the protection process. Recently, many researchers have developed neural networks as new tools in many fields, such as pattern recognition, information processing and control design. However, numerous researchers have explored ways in which artificial neural networks may apply to the electric power industry. Those applications which interest users most are focused on electric power system operation and protection. In this thesis, research has been conducted on the design and implementation of an advance microprocessor based intelligent relay for multi-function protection system. The developed project utilises knowledge and principle of overcurrent and differential protection schemes, as well as neural network and advanced microprocessor based relay modular format system incorporating high flexibility, high response speed, high communication ability and high artificial intelligence ability. It checks the performance of the developed software and hardware, and verifies its effectiveness. It also demonstrates a modular architecture that allows scope for further enhancement of future algorithms.

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