Alternative Differential Unit Protection for Cable only and Cable & OHL hybrid installations

Jan 2012

Electricity Transmission

Reference: NIA_NGET0072

Status: Complete

Start Date: Jan 2012

End Date: Jan 2014

Funding Licencee(s): National Grid Electricity Transmission

Contact: Tahasin Rahman

Funding Mechanism Network Innovation Allowance

Research Area: None

Core Technology(ies): Conductors and Resilience

Estimated Expenditure: £112,000.00

Introduction: This R&D Project aims :

To evaluate the practicability, reliability and benefits of implementing alternative non conventional current sensors (i.e. Rogowski coil) based differential unit protection for Cable systems (i.e. Cable only and Cable & OHL hybrid installations) over conventional Current Transformer (CT) based protection. To carry out the preliminary evaluation a pilot installation is recommended on Pitsmoor-Wincobank cable circuit on April 2012 as monitoring unit.
To determine the systems suitability to be utilised as Emergency Return to Service (ERTS) system.
This will help to formulate a technical and operational knowledge base for Non Conventional Instrument Transformer (NCIT) protection systems which could lead to evaluation of future technical and procurement strategy to deploy as replacement and/or new Cable system protection.

Objectives:

To report on the practicalities reliability and potential benefits of implementing alternative non conventional current sensors.

Expected Benefits: To identify potential of implementing non conventional current sensors across the transmission network.