DEVICE, SYSTEM AND AUTO-TRANSFORMER ABSORBING ZERO SEQUENCE HARMONICS IN LOW VOLTAGE ELECTRICITY DISTRIBUTION NETWORKS

摘要

the invention relates to a device, zero sequence harmonic suppressor system and autotransformer for unbalanced three phase systems with nonlinear loads, comprising a plate-mounted silicon steel core to be able to reduce the losses caused by eddy currents, terminals in terminals suitable for each current value and a metal cabinet with forced ventilation and a truss suitable for the thermal flow to be evacuated, wherein said silicon steel core comprises three c-shaped legs, arranged in front of each other, oriented 120o apart, forming a three-pointed star; three insulated copper windings according to the power or current flowing through the windings,with outputs to make connections or phase crossings, where the flow distribution is distributed on the three legs of the silicon steel core, 50% in the first leg, 25% on the second leg and 25% on the third leg, for each phase, wherein the polarity of said second and third legs is reversed, causing the flows in the second and third legs to be summed with a sign opposite that of the flow in the first leg, giving a result of zero, with a minimum impedance for zero sequence currents, absorbing the neutral current is reinjecting the residual current to the phases in a balanced manner.