电机学电机学电机学 (11).ppt

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1、Electrical MachineryMeasurement of Transformer ParametersAim:test transformation ratio k,no-load loss p0,exciting impedance Zm 1.No load experiment1.No-load experimentAim:test the copper loss of a transformer,pCu,and the short-circuit impedance,Zk.2.Short-circuit experiment2.Short-circuit experiment

2、Test UkN,pk,Ik of rated current point and conduct data processing.2.Short-circuit experimentNo-load experimentShort-circuit experiment3.Short-circuit voltageShort-circuit voltageIn the short-circuit test,when the short-circuit current is the rated current,the percent,the voltage of the primary side

3、to the rated voltage.Short-circuit voltage is an important parameter of the transformer,which reflects the magnitude of the voltage drop on the leakage impedance when transformer is on rated load.Its value is directly related to the value of the short-circuit current and the voltage stability of the

4、 secondary side.Small Transformer:Large Transformer:4.Per unit valueGenerally,rated value is regarded as the base value,for example:The rated voltage and current of the primary side are respectively regarded as the base value of primary voltage and that of primary current.The rated voltage and curre

5、nt of the secondary side are respectively regarded as the base value of secondary voltage and that of secondary current.The base value of the primary side and that of the secondary side respectively are:4.Per unit valueAdvantage of using per unit valueThe values of physical quantities are simplified,and they are obvious and clear;The physical quantities of the secondary side need no conversion,for example:Some different physical quantities have the same value.THANKS FOR WATCHING!