scope:

These guidance notes apply to those parts of Railtrack's 25 kV a.c., 50 Hz electrified railway infrastructure, which includes the use of traction return conductors and booster transformers, in accordance with RT/E/S/21078 - Design of Earthing & Bonding Systems for 25kV a.c. Electrified Lines.

The scope of these guidance notes is to provide assistance on the operation of Railtrack's 25 kV a.c., 50 Hz electrified railway, where there is an occurrence of booster transformer outage(s). These guidance notes provide a means of assessing the severity of each outage and hence the expected increase in the level of induced longitudinal voltage into lineside equipment.

The guidance notes do not include instructions for specification, approval, installation, commissioning, maintenance or day-to-day use of booster transformers.

Purpose

These guidance notes support the Railtrack Company procedure for managing the outages of booster transformers on 25 kV a.c., 50 Hz electrified lines and assist the Zone Electrification and Plant Engineer in assessing the actions required to be taken in the event of booster transformer outage(s).