DEVICE FOR CONVERTING THREE- AND SINGLE-PHASE SUPPLY VOLTAGES AND CURRENTS (ALTERNATIVES) Russian patent published in 2006 - IPC H01F30/14 H02M5/14 

FIELD: electrical and conversion engineering; reversible conversion of thee-phase supply voltages and currents.

SUBSTANCE: proposed device provides for joint operation of three- and single-phase supply mains and power consumers with balanced three-phase voltages and currents being maintained. Linear characteristics of converter components ensure high quality of electrical energy in supply mains and at power consumers and normally desired electrostatic compatibility between power supplies and power consumers. Single-phase supply voltage and current are first converted into balanced system of modulo equal two-phase voltages and currents shifted in phase by one fourth of cycle. Then transformer converter functions to convert two-phase voltages and currents into balanced set of modulo equal three-phase voltages and currents of receiver shifted in phase by one third of cycle. Two-step inversion occurs in reverse sequence. Converter is checked for balanced operation and ballast reactance components are controlled by measuring phase shift angle between two-phase currents as function of magnitude and polarity whose deviations act upon reactances of ballast components.

EFFECT: ability of feeding single-phase power consumers from three-phase primary mains handling balanced loads and three-phase consumers with balanced power from single-phase mains.

6 cl, 5 dwg