Author(s)

J. Allan, J.H. Jin & K. Payne

Abstract

First characteristic harmonic component of output ripple on dc railway rectifiers J. Allan™, J. H. Jin® & K. Payne® ^ The University of Birmingham, UK. ^London Underground Limited, UK. Abstract A research project is being carried out by the University of Birmingham, sponsored by London Underground Ltd, to research into a new earth fault detection system on a fourth rail power supply system. It is proposed that the fault detection system will make use of the first characteristic harmonic component of ripple on the output side of the substation rectifiers. It was therefore necessary to have knowledge of the variation in the voltage of the first harmonic component of the ripple with load current on the output side of the substation rectifier. Analytical and simulation studies were carried out, which revealed that the variation in first characteristic harmonic component of substation ripple with load current did not appear to match classic theory where load inducta

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