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Publish Date : 04-Apr-2014

Western Power Distribution (WPD), the network operator, is future-proofing the power distribution network in Birmingham, the UK's 'Second City', by installing two Nexans superconducting fault current limiters. The order covers the design, fabrication, and permanent installation of the innovative devices, including the associated switchgear, and has a total value of approximately EUR 2.6 million. This is Nexans' third UK order for superconducting fault current limiters and the largest to date.

Installation of the pioneering technology in Birmingham's network is part of the FlexDGrid project, which aims at future proofing existing networks to accept more electricity generated from sustainable resources. The new equipment helps achieve this objective by enabling higher power feed-in from distributed or renewable electricity sources. In many places this will remove the need for network expansion with new substations. The FlexDGrid project is financed by EUR 20 million from the Low Carbon Networks Fund, a national initiative for reducing carbon dioxide emissions.

The project objective is to mitigate faults, improve understanding of their causes, and reduce fault current levels. Measuring systems to monitor fault current levels are being installed in 10 substations, and five stations will additionally be equipped with current limiting technology. The Nexans fault current limiter is the only superconductor device that will be used and will be deployed in two of the five substations. WPD chose the novel superconductor technology because it allows a very effective limitation of high short circuit current levels.

The superconducting fault current limiters, which have already proved their reliability in several distribution networks and power station auxiliary supply systems, provide especially effective protection against fault currents for downstream components in the network. They are inherently safe and highly effective, and their operating costs are low. WPD intends to use the new equipment on a continuous basis.

The heart of the fault current limiters consists of superconductor tapes cooled to a working temperature of approximately -195°C by liquid nitrogen. Under normal conditions these tapes allow current to flow unhindered and with virtually zero resistance. If the current rises above a critical level, then within a few milliseconds the superconductor tape changes into a normal conductor with extremely high electrical resistance. In this state only a small residual current flows through the limiter. The two Nexans limiters - for the Chester Street and Bournville substations in Birmingham - are designed to operate at a voltage of 11 kV with a nominal current of 1,600 A (Chester Street) and 1,050 A (Bournville). Current limiting is initiated immediately when the current rises above the nominal value.

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