Servizio Comunitario di Informazione in materia di Ricerca e Sviluppo - CORDIS

Direct and indirect measurement of individual ac l loss components

For reduction of ac losses of superconducting composites by optimizing geometry, filament configurations and normal matrix materials, it is desirable that individual loss components can be determined independently, whereas established techniques for ac loss measurements can only give the total loss. Bases on our previous research on ac loss measurements, SOTON has developed and refined within the Big-POWA project a novel technique, which enables the measurement of individual loss components.

This technique involves two experiment protocols:
- Direct measurement of the superconductor loss using the 3RD harmonic of the pick-up voltage, and indirect measurement of coupling current loss as the difference between the total and superconductor losses. This method is applicable to standard loss measurement technique using pick-up coils.

- Direct measurement of coupling current losses using a pair of voltage taps long the direction of the applied field and transverse to the longitudinal direction.

Protocols are normally applied in tandem for better accuracy.

This novel measurement technique is relevant to all cases of ac loss in superconductors. It will not only aid the reduction of losses in conductor development, but also help to understand previously unknown behaviours of novel conductors.

SOTON has a state-of-the-art ac loss measurement system integrated with this novel technique, and is ready to serve the community working on material development and power applications of superconductors.

Reported by

School of Engineering Sciences, University of Southampton
University Road
SO17 1BJ Southampton
United Kingdom
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