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1.2 - JIC HVDC 16 Topic 1 Gockenbach Topic 1: Progress in the understanding of physical phenomena and materials for use in DC Professor Dr Ing Ernst Gockenbach , Leibniz Universitt Hannover, Germany 1 Workshop Jicable HVDC16, Friday,

  1. 1.2 - JIC HVDC 16 Topic 1 Gockenbach Topic 1: Progress in the understanding of physical phenomena and materials for use in DC Professor Dr Ing Ernst Gockenbach , Leibniz Universität Hannover, Germany 1 Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

  2. § Development status, roadmap, characterisation and criteria of choice for new materials including thermoplastic insulation, nanotechnology, XLPE low by-product § Environmental impacts of materials, carbon footprint, pollution and recyclability § Understanding of ageing mechanisms and polarity reversals constraints § Evaluation of electrical fields at triple points § Behaviour of DC cables operated in AC for flexible electrical systems 2 Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

  3. Development status, roadmap, characterisation and criteria of choice for new materials including thermoplastic insulation, nanotechnology, XLPE low by-product Questions and comments New materials available? Voltage limits? Experience? 3 Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

  4. kV/mm Source: Kabelanlagen für Hoch- und Höchstspannung 16 Electric field stress Mean field stress 12 Conductor field stress E. Peschke, R. v. Olshausen 8 4 0 10 20 30 60 110 132 150 220 275 kV 500 Operating AC voltage 4 Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

  5. Source: Kabelanlagen für Hoch- und Höchstspannung E. Peschke, R. v. Olshausen 5 Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

  6. Source: Kabelanlagen für Hoch- und Höchstspannung E. Peschke, R. v. Olshausen 6 Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

  7. Source: Furukawa Review, No. 25, 2004, S. 47 - 52 7 Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

  8. Source: Kabelanlagen für Hoch- und Höchstspannung E. Peschke, R. v. Olshausen 8 Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

  9. Source: IEEE Electrical Insulation Magazine, November/December 2007 — Vol. 23, No. 6, p. 11 -19 9 Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

  10. Environmental impacts of materials, carbon footprint, pollution and recyclability Questions and comments Fluid impregnation material? Recycling of XLPE? 10 Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

  11. Understanding of ageing mechanisms and polarity reversals constraints Questions and comments Ageing: thermal, electrical, mechanical, chemical? Polarity reversal: space charges? 11 Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

  12. Long time behaviour 3 10 Electrical breakdown Erosion breakdown kV mm 2 10 E D XLPE 20 °C 10 E N • t = const 1 3 -6 -3 6 9 10 10 1 10 10 s 10 1s 1d 30a time 12 Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

  13. Ageing parameter and life time volume Electric field Time Temperature 13 Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

  14. 50 Hz AC Cable De-energized AC Cable - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5 ms - + + + - - + - + + + - - + - - - + + + + - + - - - + + + - + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + - Source: ETG HVDC Colloquium, Berlin, 2011 - - + - - + - - - + - + - + + + - + - + + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10 ms - + + + - - + + - - - + + + - - - - DC Cable + - + - + - + + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + + + + + - + - + - + - + - + - + + + + + + + + + + + + + + + + + + + + + + 15 ms - + + - - - - + - - + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + - - - + + + - + + + + + + + + + + + + + + + + + + + + + + + + + + + + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - + - + - + - + - + - + - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - + + + - + - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + - + + + + + + + + + + + + + + + + + + + + + + + + + Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

  15. Evaluation of electrical fields at triple points Questions and comments Specific for cables? Methods? 15 Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

  16. Behaviour of DC cables operated in AC for flexible electrical systems Questions and comments System voltage change AC – DC - AC? What are the determining parameters? 16 Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

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