Topic 1: Progress in the understanding of physical phenomena and - - PowerPoint PPT Presentation

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Topic 1: Progress in the understanding of physical phenomena and - - PowerPoint PPT Presentation

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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,

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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

1.2 - JIC HVDC 16 Topic 1 Gockenbach

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Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

§ 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

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Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

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?

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Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France 4

4 8 12 16 10 20 30 60 110 132 150 220 275 kV 500 Operating AC voltage Electric field stress Mean field stress Conductor field stress kV/mm

Source: Kabelanlagen für Hoch- und Höchstspannung

  • E. Peschke, R. v. Olshausen
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Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France 5

Source: Kabelanlagen für Hoch- und Höchstspannung

  • E. Peschke, R. v. Olshausen
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Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France 6

Source: Kabelanlagen für Hoch- und Höchstspannung

  • E. Peschke, R. v. Olshausen
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Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France 7

Source: Furukawa Review, No. 25, 2004, S. 47 - 52

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Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France 8

Source: Kabelanlagen für Hoch- und Höchstspannung

  • E. Peschke, R. v. Olshausen
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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

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Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

Environmental impacts of materials, carbon footprint, pollution and recyclability Questions and comments Fluid impregnation material? Recycling of XLPE?

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Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

Understanding of ageing mechanisms and polarity reversals constraints Questions and comments Ageing: thermal, electrical, mechanical, chemical? Polarity reversal: space charges?

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Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

1 10

  • 6

10

  • 3

10

3

10

6

10

9

s

Electrical breakdown Erosion breakdown

1d 1s 30a 1 10 10

3

time

10

2

kV mm XLPE 20 °C

ED E N • t = const

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Long time behaviour

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Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France 13

Electric field Time Temperature

Ageing parameter and life time volume

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Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

+ - + - +

  • + -

+ -

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De-energized AC Cable

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  • - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  • - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

DC Cable

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50 Hz AC Cable

  • - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

+ - + - +

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+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +

5 ms

+ - + - +

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+ -

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10 ms

+ - + - +

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+ -

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+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +

  • - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - --
  • - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - --

15 ms

Source: ETG HVDC Colloquium, Berlin, 2011

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Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

Evaluation of electrical fields at triple points Questions and comments Specific for cables? Methods?

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Workshop Jicable HVDC’16, Friday, August 26, 2016 - Paris - France

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?

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