| 摘要 |
A method for determination of weber-ampere characteristic of measuring voltage transformers relates to the area of electrical engineering, in particular to measurement of electric parameters of magnetic fluxes in voltage transformers, in particular the weber-ampere characteristic. The method consists in loading the circuit of charged capacitor with at lest one of windings of the measuring voltage transformer with registration and determination of electric parameters of transition process. To the circuit of charged capacitor only the main secondary low-voltage winding of not loaded transformer is included, with registration by oscillograph of the electric parameters of current in the circuitand the voltage of the capacitor, with registration by multimeter of the electric parameter of the active resistance of the secondary winding, after that the electric parameters of voltage on active resistance of the secondary windingare determined by formulaand the voltage on the non-linear inductance by formula, than the electric parameter of the flux linkageis determined through integration of the electric parameter of voltage on the non-linear inductanceby formulawith obtaining the weber-ampere characteristicfrom the electric parameters of the flux linkageand the currentobtained, with exclusion of the timevalue at calculations. The results of measurement of the weber-ampere characteristic can be used for evaluation of metrological characteristics of the voltage transformers and initial data at study of ferro-resonance processes. |
