scope:

This specification applies to all new booster transformers for new and existing suppression systems utilising return conductors installed on A.C. Electrified Lines.

Purpose

This specification states the requirements for the design, manufacture and testing of outdoor type 25 kV booster transformers for use as part of a return conductor system for the suppression at source of electromagnetic interference on A.C. Electrified Lines in order to reduce the level of interference induced into adjacent signalling and communication circuits.

The document is to be read in conjunction with the relevant procurement specification.