Patent ID: 6700223
Filing Date: 2004-03-02
Classification: H02H

Abstract:
Active booster transformer system comprising:a booster transformer core (S, 10, 17) of the type which is applied around an electric cable (K, 1, 13) for reducing stray currents, the booster transformer core being a body built up of magnetizable material provided with a continuous channel, intended to accommodate the cable, a current sensor (G, 2-3, 14-15) which senses the net current in the cable (K, 1, 13), and an amplifier unit (F, 4-7), the input signal of which amplifier unit comes from the current sensor and a magnetizing winding (L, 3, 15) situated on the booster transformer core (S, 10, 17), the output of the amplifier unit being arranged to drive the magnetizing winding to create a magnetic flow in the booster transformer core, the flow, in turn, inducing a longitudinal voltage in the cable which counteracts the stray current, wherein, the amplifier unit (F, 4-7) is built up in such a manner that its output coupled to the magnetizing winding (L, 3, 15) exhibits an output voltage which is an image of the remaining stray current sensed by the current sensor.