Arrangement and method for the compensation of a magnetic unidirectional flux in a transformer core

摘要

An arrangement for reducing a DC field component in the core of a transformer includes a compensation winding magnetically coupled to the core of the transformer, and a DC generator arranged in series with the compensation winding and with a reactance dipole. The reactance dipole is formed from a parallel circuit of an inductance and a capacitor to feed into the compensation winding a compensating current opposite in sense to the DC field component in the core. The inductance is formed from magnetically coupled first and second windings having N1 and N2 turns respectively, such that N2/N1<1. The first winding is connected on one end to the DC generator and on the other end to the compensation winding. The second winding is connected in parallel with the capacitor. The magnetic coupling of the first and second windings is established via a soft magnetic core having an air gap.

主权项

1. An arrangement for reducing a DC field component in the core of a transformer, comprising:
a compensation winding which is magnetically coupled to the core of the transformer, a DC generator which is arranged in series with the compensation winding and with a reactance dipole, wherein the reactance dipole is formed from a parallel circuit of an inductance and a capacitor, in order to feed into the compensation winding a compensating current, the effect of which is in the opposite direction to the DC field component in the core, wherein the inductance is formed from a first winding which is magnetically coupled to a second winding, wherein the ratio formed from the number of turns N2 of the second winding and the number of turns N1 of the first winding is formed according to the relationship N2/N1<1, wherein the first winding is connected by its one end to the DC generator and by its other end to the compensation winding, wherein the second winding is connected in parallel with the capacitor, and wherein the magnetic coupling of the first winding and of the second winding is established via a soft magnetic core which has an air gap.