Project Overview

We are proposing to replace around 106 protection relays at 6 substations to maintain safe
and reliable electricity supply to customers.

This Regulatory Investment Test for Transmission (RIT-T) Project Specification Consultation Report
(PSCR) identifies the need to replace 106 protection relays at six substations as the preferred solution
to manage the risk that these assets will fail.

Protection relays are electricity system components that trip circuit breakers when an abnormality in
operating conditions is detected. They protect other components of the electricity system by ensuring
faults are cleared within the times stipulated in the National Electricity Rules (NER).1 The protection
systems in question for this PSCR have reached the end of their technical lives and they are no longer
supported by the manufacturer. There is an increased likelihood that several of these protection relays
will fail in the coming years resulting in unplanned customer outages.

Protection relays are essential to the task of transmitting electricity, without functional and compliant
protection relays electricity infrastructure, electrical workers and the general public are at risk.

Project Specification Consultation Report (PSCR)


Reports Closing Dates Status Submissions
Project Specification Consultation Report (PSCR) Consultation Open
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