Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p 1 Nexans' Superconducting Fault Current Limiters for medium voltage applications - status and prospects - Achim Hobl, Joachim Bock, Simon Krämer, Markus Bludau, Judith Schramm, Christian Jänke, Steffen Elschner Nexans SuperConductors

Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p 2 Contents  Function of SFCL´s  Possible installation sites  SFCL Systems  Perspectives for future grids

Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p 3 Operating area of HTS devices operating area HTS FCL normal operationlimitation Transition faster due to temperature rise

Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p 4 Resistive Limitation FCL Breaker Load + compact + intrinsically safe + strong limitation + independent of short circuit level – current leads to low temperature

Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p 5 Inductive Limitation + no quench of the superconductor + can be without interruption – large volume and weight – low level of limitation – relatively high impedance FCL Load

Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p 6 Function normal operationlimiting operation ultrafast reacts in 1-2 ms automatic no external trigger, self-recovering wear-free service only for cooling

Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p 7 Installation sites Bus bar coupling In line (secondary side of transformer) House load protection in power plants (auxiliary power) FCL Transformerfeeder Busbarcoupler Highvoltage Medium voltage

Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p 8 Advantages of the FCL system  Passive limiting characteristics of the superconductor  Inherently safe and free from wear and maintenance  The power flow is not interrupted completely  Less mechanical and thermal stress  Higher network reliability  Considerable cost savings  Low impedance networks  Voltage stability and reduction of harmonics  Load levelling of busbars / transformers Customer benefits

Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p 9 FCL Systems (ASL 1) first commercial system Field tested for ~8 months (Vattenfall) first system in a power station Field tested Nov Dec XX-YYY XX: Voltage [kV] YYY: Current [A] (ASL 2) second system for UK (bifilar) Delivered to UK April 2011

Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p ASL, Newcastle ENW, Bamber Bridge Live on grid to

Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p Test at IPH Customer has ordered second system!

Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p

Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p Power Plant Boxberg, Germany Supply for crushers and conveyor belts Nominal voltageU r = 12 kV Nominal currentI r = 800 A Inrush current, peaki max = 4100 A (50 ms) Inrush current, rmsI max = 1800 A (15 s) Prospective short currenti p = 63 kA (R/X=0.08) limited 1 st Peaki lim < 30 kA Limiting timet = 120 ms Operating temperatureT = 65 K

Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p 14 Perspectives for future grids  Low impedance networks WITH low short circuit power  Supports integration of distributed generation  Load / generation growth without substation upgrading  Improvements in availability and stability

Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p 15 Integration of distributed generation 110 kV 10 kV grid generator transformer G MVA 10 kV FCL

Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p 16 thank you for your attention power safety at its best