New Busbar Protection Devices

Combining with key research project "The development of the new-type busbar protector" set up by our company, this paper is mainly on developing a suit of new-type device for high voltage, supervoltage busbar protection in power system.This paper has introduced the current situations of the development of the busbar protector and technology at present at first, and then the application of digital signal processing technology in relay protection. At the same time a brief introduction be made to the development of the existing digital signal processing technology.The items related to the object we study, including principle, technical properties, are carried on in details in chapter two, especially on the current technological situation of existing busbar protector, several key problems that we study are put forward further: the choice of the action criterion and the research of the new algorithm of busbar protector, the self-adaptation of busbar protector and through further investigation of the mechanism of CT saturation to overcome the influence and dependability of bus-bar protectorate.In chapter four, there is a detailed introduction of the technology scheme of the device, including the implementation scheme of divide phase differential, the whole set of hardware design, the choice of main chips, software designing and debugging results of prototype of a machine.Finally, considering the importance of busbar protector for power system security, stability, dependability and so on. We propose and improve further the research of dependability of bus-bar protector in the last chapter especially, and illustrate the measure of preventing the device from mis-action or refusing action, respectively from hardware circuit design, software design and technological design, etc.