Modern redesigned time limit fuse protection for MV ring main units

摘要

This paper describes a new, economic and modernised version of the well known Cleveland protection / Time Limited Fuse (TLF) principle. The protection diagram has been redesigned and can now be used on all modern types of Medium Voltage Ring Main Unit switchgear with far less energy need compared to the conventional TLF scheme. The paper describes the technical background of the design and the possible applications in the network.