scope:

This specification applies to those parts of Network Rail's 25 kV a.c., 50 Hz electrified railway infrastructure, which includes the use of traction return conductors and booster transformers. It mandates the requirements for the operation of Network Rail's 25 kV a.c., 50 Hz electrified railway, where there is an occurrence of booster transformer outage(s).

This document does not include instructions for specification, approval, installation, commissioning, maintenance or day-to-day use of booster transformers.

Purpose

This specification defines the process for managing the outages of booster transformers on Network Rail's 25 kV a.c., 50 Hz electrified lines. It details the actions required to be taken. Further and more detailed information on booster transformer outages can be found in the Network Rail guidance notes NR/GN/ELP/24015