Study Of Digital Bus-bar Protection

With the continuous enlargement of the scale of power network, the damage of bus-bar fault to electric devices and system stabilization become increasingly serious, so that the deeper research for bus-bar protection device becomes necessary than ever before. The digital bus-bar protection has gained great achievement at present, meanwhile, some defects still existed. and therefore, further developments is required. To design a sort of digital bus-bar protector with rapidity, sensitivity, reliability can get enormous economic benefits and accelerate its development, so developing the research on digital bus-bar protection device is a valuable work.In the first part of this paper, introduce the importance of bus-bar protection for power grid, the development history and progress of bus-bar protection and some hot issues which would affect the performance of bus-bar protection. Based on above discussed, the main content of the paper is determine.In the second part of this paper, by analyzing and comparing the fundamental principles as well as studying on the main algorithm of the bus-bar protection, the paper selects the best one which can be applied to this device, that is current difference protection principle which relies mainly on ratio difference component.In the third part of this paper, a set of protection scheme is presented.In the fourth part of this paper, the main research work is focused on several key problems: self-adaptive to operation mode, anti-CT saturation and anti-interference.In the last part, not only all of the research work accomplished in this thesis is summarized, future improvement is pointed out as well.