METHOD OF MEASURING PARAMETERS OF T-SHAPED EQUIVALENT CIRCUIT OF MULTI-CURRENT SINGLE-PHASE TRANSFORMER WITH SINGLE UNLOADED WINDING IN WORKING MODE

摘要

FIELD: electromechanics.;SUBSTANCE: method can be used for data processing in electromechanics. In method of measurement of parameters of t-shaped equivalent circuit of multi-current single-phase transformer with single unloaded winding in working mode while transformer works at mode when primary winding is connected to power supply with known frequency and secondary windings are connected to loads while leaving circuit of at least one winding to be open, massifs of instant values of input current, input voltage, currents in all the loaded secondary windings, voltages in all the secondary windings including voltage in winding with open circuit are registered at known numbers of turns of transformer for the same moments of time. Then number of counting of instant values is measured at current period and massifs of instant values of currents in secondary windings and voltages at loaded secondary windings and in winding with open circuit. Then massif of instant values of voltage drop at resistor of primary winding is formed as well of derived voltage at unloaded winding and massifs of instant values of derived voltages voltage drops at resistors of loaded secondary windings and derived voltages at corresponding secondary windings as well as massif of instant values of magnetization current. After that effective values of input current are measured simultaneously as well as of magnetization current and derived secondary currents from massifs of instant values of those currents Then active power losses are measured at resistor of primary winding, resistance of magnetization branch and at derived resistors of loaded secondary windings. Those values are calculated on base of massifs of instant values of currents and voltages at corresponding resistances via squares of characteristics of those resistances. Then, while taking particular above-mentioned values of currents and values of active and reactive powers, active and reactive components of resistances of primary winding and magnetization branch as well as derived resistances of loaded secondary windings of transformer. Goal of invention is development of method of measurement of parameters of T-shaped equivalent circuit of single-phase transformer with any number of secondary windings at working mode when one unloaded winding is present.;EFFECT: improved precision of measurement; improved reliability f operation.;3 dwg, 4 tbl