基于磁链平衡方程的变压器保护的关键问题的研究

变压器是电力系统中的枢纽关节,是电力系统的重要组成部分.在查阅大量

Study on the key issues of transformer protection based on magnetism-chain balance equation

Transformer is the hinge joint of power system, which is also the important part of power system. Based on many references, this paper analyzes the actuality of transformer protection. According to the transformer model-based transformer protection principle, this paper brings forward a novel principle, which is based on the magnetism chain balance equation, and discusses the feasibility theoretically. The principle applies the recursive least-squares theory with oblivious factor to estimate transformer parameter. So the rate of estimate constringency will be enhanced. In addition, the principle uses differential coefficients transform method based on projection transform to overcome the errors which are caused by difference transform. Through primary analysis theoretically, this protection scheme can confirm the acting value of protection Kzd exactly via distinguishing the parameter of transformer accurately and fleetly and realize the differential coefficient transforming based on projection transform.