DEVICE FOR AUTOMATIC COMPENSATION OF CAPACITANCE CURRENTS WITH BALANCING OF PHASE VOLTAGES OF NETWORK Russian patent published in 2020 - IPC H02H9/08 

FIELD: electrical equipment.

SUBSTANCE: field of application: electrical equipment. Automatic compensation device includes a phase-balancing unit (PBU) consisting of a power amplifier, a current-limiting element and a feedback circuit, and a control unit of the arc suppression coil drive control, which includes an amplitude-phase detector, a setting unit, an arc suppression coil engine control device for supporting the resonance tuning of the zero sequence circuit (ZSC) of the network with change in its transverse phase conductivity. By means of the secondary winding of the arc suppression coil or the transformer connected in parallel to the arc suppression coil, the FS unit, the output signal of the power amplifier, proportional to displacement value of neutral serves as information coordinate of PBU drive automatic control unit, control of its inductance makes ZSC adjustment to resonance mode of compensation of capacitance currents of earth fault in distribution network. Application of the device allows to support resonance mode of compensation in a network with balancing of phase voltages of the network in a wide frequency band, which is especially important in networks with overhead lines, with cables with insulation from cross-linked polyethylene having high Q-factor, as well as in networks having consumers with equipment of nonlinear load.

EFFECT: technical result is reduction of asymmetry of network phase voltages relative to network, maintenance of resonance tuning of ZSC in networks with air, cable and mixed lines and higher reliability of electrical equipment.

2 cl, 2 dwg