Duplicate Configuration Of Relay Protection For Large Generator Transformer Set

In this paper,local 300MW generator transformer unit was taken as an example to research on the principle of configuration for microprocessor-based protection.The basic requirements for protection were put forward.Project plan of protection is confirmed after the analysis of incorrect tripping after duality reform.In Zhangjiakou power station optimal design was adopted on AC current,voltage,export,asignal and other important circuit so that the organic interface of new devices and old circuit meet the requirements of dual protection.Brevity and utilitarian validate method for new generation of generator-transformer unit protection devices was researched,check the correctness of the second loop through phase voltage loop,current loop vector test,and current-voltage verification.Further analysis was carried out on problems after the double protection transformation.And then solutions and recommendations were proposed.