VECTOR SYSTEM FOR CONTROLLING OUTPUT CURRENT OF THREE-PHASED TRANSFORMERS Russian patent published in 2000 - IPC

FIELD: electrical engineering. SUBSTANCE: system has leads for connecting axial input signals connected to the first inputs of the first and the second summing units, four comparator units whose inputs are connected to outputs of the summing units, logical unit with comparator outputs connected to the logical unit inputs, power transformer controllable by the logical unit and having keys, and coordinate transformer converting three-phased system of power transformer output signals into equivalent two-phased system. Outputs of the coordinate transformer are connected to inputs of the summing units. Two RS-triggers and two impulse-type recording members for fixing input signal changes are introduced into the design. Comparator outputs determining axial actual output current deviation sign from the given values are connected to the RS-triggers inputs through the impulse-type recording members for fixing input signal changes. The other RS-triggers inputs are connected to comparator outputs determining permissible zone of the axial actual output current deviation from the given values. RS-triggers outputs are connected to logical unit input entries. EFFECT: enhanced reliability of control system. 3 dwg