| 摘要 |
The invention relates to electric engineering. A primary winding of an auxiliary transformer, in which secondary winding a first balancing capacitor is connected, is introduced into a four-wire power-supply system, comprising a 10/0,4 kV transformer with windings connected according star/star with zero circuit, phase windings A,B,C and N zero wire, between the zero terminal of 10/0,4 kV transformer and N zero wire beginning. Moreover, two balancing capacitors, four semistors, four current transformers, a galvanic insulation, a power unit, a control unit and a switching unit are introduced. An output of galvanic insulation is connected to a first terminal of control unit. Current transformers are connected respectively to the A, B and C phases and zero phase N, the transformers terminals are connected to the galvanic insulation, which output is connected to the first output of control unit, the power unit is connected to the C phase and N wire. The first output of power unit is connected to the second output of control unit; the second output of power unit is connected to the second input of switching unit; which first input is connected to the output of control unit; the first output of switching unit is connected to the control electrodes of first and second semistors.The second output of switching unit is connected to the control electrodes of third and fourth semistors, the outputs of first and second semistors are connected to the first capacitor; the leads of second capacitor, outputs of third and fourth semistors are connected to the second capacitor, the inputs – to the third capacitor. Consumers are connected to the phase and zero wires. The invention provides enhancement of functional capabilities of the four-wire power-supply system due to compensation of voltage drop occurs in the zero wire when currents including an inductance component run. |
