Study On Differential Protection Of Transformer And It's Error Analyse And Compensatence

As the development of economy and progress of people's life,consumers are more strict with the quality of power energy.It is a very improtment work that how to assue the stability and reliability of power system.Power transformer is one of the most improtment equipment in power system.It's function associates tigthtly with the stability of system. Especiallythe price of power transformer is much high,the damaify is serious if it is destroyed by faults.So power department attachs importmence to the protection of transformer and it is one of the emphases.Differential protection of transformer can discriminate the faults correctly and it is used broadly.As the inrush current and the precision of the equipments,protection misoperation occurs frequently.Inrush current is about with the theory of differential protection ,but research exotericas of it is used difficulty in fact.Moreover analyzing the infection causes of precision and compensating them ,we will get better income.For the reasons above ,we design a sort of protection transformer production based on DSP .On the design,we analyze the infection causes of precision on hardware and arithmetic.We find the Lowpass filter and A/D sampling circuit effect on the precision of equipments and take some actions to compensate it .Furthermore the change of system frequency will also effect it ,we research the relation of them.These results about the influence on the precision of differential protection are usely to reduce the misoperation of power transformer and the expense of power department.