Electromagnetic compatibility on rapid transit railways-a systems approach

The authors describe how London Underground Ltd (LUL) has dealt with electromagnetic compatibility (EMC) on two major projects. These are the Jubilee Line Extension Project and the Central Line Renewal Project. The combined cost of these projects is expected to be approximately £2300 million. EMC is seen as a critical factor in the success of these projects. They start by describing the systems approach to major projects at LUL. The broad range of EMC topics associated with such projects is then described. It is shown that the EC directive and European standards play a part in specification of EMC and testing requirements. However, the special environment of tunnels means that the more stringent domestic, commercial and light industry standards for RF emissions are more suitable than those for industrial applications. Also there are a number of areas where European and UK national standards are lacking, particularly at the low frequency end of the electromagnetic spectrum for induced interference rather than radiated interference