The adoption of new concepts in AC traction interference control

Brush Traction has a long history in the development of AC drives including the World´s first locomotive using inverter fed induction motors. With the introduction of 3-phase drives into the UK came a new interest in signalling compatibility. This led to major development programmes in which the system design for signalling compatibility became a dominant factor. After the introduction of AC drives onto the UK DC railway, attention turned to the AC railway and the compatibility of pulse converters. Cecube teamed up with Brush Traction to develop an advanced modulation system for pulse converters, to offer significant advantages over existing forms of control system. This paper describes some of the background to this and presents the new modulation system for the first time