Research On110kV FengJia Substation Transformer Protection

In power system, the substation is an important component in power system. Inthe substation, transformer is the core element of this element, so the transformer canbe normal, stable operation is directly related to the stability of the entire powersystem. At present, with the continuous increase of social power, the capacity oftransformer is also increasing, in order to ensure the normal and stable operation ofthe transformer, we have higher requirements for the transformer protection.Transformer protection is to protect the safety of power transformers and avoidlong time power system blackout of the most basic, most important, the most effectivetechnical means. In many cases, transformer protection device once cannot correctaction, will expand the accident, causing serious consequences. Therefore, tostrengthen the protection of transformer design, setting and protection debugging, isan important work to guarantee safety and security of the power transformer. Thisarticle on110kV von home power plant as an example, a simple discussion oftransformer protection.The research content of this paper is to design a conventional110kV step-downsubstation transformer protection system. The system includes the following parts: asdesign, non electricity protection and transformer differential protection oftransformer main protection setting and debugging, as well as the transformer backupprotection of the transformer over current, grounding protection design, setting anddebugging. As the main protection of transformer differential protection is the maincontents of this paper.Differential protection by differential quick break protection anddifferential protection, internal, external fault of transformer main reaction, as theelectric quantity of the main transformer protection, and its performance directlydetermines the performance of transformer protection. In the first chapter ofdifferential protection of transformer differential current protection principle andoperation principle are introduced briefly, then focus on the analysis of the normalstate of unbalanced current ge`nerated reasons and elimination of normal unbalancedcurrent method, the final details on the transformer differential protection setting rulesand differential protection commissioning method.