1.4 Qualification of 525 kV DC extruded cables Technologies for - - PowerPoint PPT Presentation

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1.4 Qualification of 525 kV DC extruded cables Technologies for - - PowerPoint PPT Presentation

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1.4 Qualification of 525 kV DC extruded cables Technologies for Global Energy Grid 27.06.2019 Dr. Roland D. Zhang Topics Introduction GTSO PQ tests for HVDC underground cable systems Qualification of DC submarine cable systems

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1.4 Qualification of 525 kV DC extruded cables

Technologies for Global Energy Grid

  • Dr. Roland D. Zhang

27.06.2019

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Topics

  • Introduction
  • GTSO PQ tests for HVDC underground cable

systems

  • Qualification of DC submarine cable systems for
  • ffshore wind
  • Discussion

2

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3 27/6/2019 TGEG'19 Workshop

  • Headquartered

in Arnhem (the Netherlands) and Bayreuth (Germany)

  • Fully owned by the State
  • f the Netherlands
  • The 4th largest TSO in the EU after

RTE (France), Terna (Italy), REE (Spain)

  • Grid availability 99,9988% in 2018
  • Worldwide the largest TSO for

HVDC extruded cables

Europe’s first cross-border TSO

Introduction (1)

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4 27/6/2019 TGEG'19 Workshop

  • German Energy transition: new DC

corridor transmission projects

  • Dutch offshore project: Ijmuiden Ver

Why needs TenneT the qualificaiton of DC 525kV cable

Introduction (2)

A

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GTSO PQ Tests (1)

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General Information:

  • Financing for the test labs by 4 GTSOs
  • 4 manufacturers, 5 test loops and 2 test labs
  • HVDC cable systems with different insulation materials

and different design of accessories

  • Starting in the summer of 2017, ongoing till today
  • New technical specification for cable systems and

Technical specification for PQ tests from GTSOs

  • Real burial condition with the dummy loop for the

temperature control

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GTSO PQ Tests (2)

27/6/2019 TGEG'19 Workshop 6

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GTSO PQ Tests (3)

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8 27/6/2019 TGEG'19 Workshop

Grid Concept IJmuiden Ver:

525kV HVDC for 2GW

PQ DC Submarine cables (1)

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PQ DC Submarine cables (2)

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“substantial” changes submarine vs. underground, i.e.:

  • Water tightness conductors/metal sheath
  • Armour
  • Mechanical treatment during production/installation
  • Water tightness of rigid repair joints
  • Delivery lengths and weights
  • Routine tests (AC and PD) of cable and joints

The definition of significant/substantial changes is difficult, can be subjective and can be unexpected, e.g.

  • different type of lubricant
  • new or different CV line
  • new or improved insulation materials etc.
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Discussion

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TenneT contributes to the development of an integrated NWE electricity market by supporting interconnection countries. TenneT contributes to the development of an integrated NWE electricity market by supporting interconnection countries.

  • Lesson-Learned from GTSO

PQ Tests:

  • Enough planning time
  • Temperature distribution
  • Temperature drop
  • Test equipment
  • Mechanical pre-conditioning for

submarine cable

  • Need one repeated PQ on the

submarine cable system? How to check the long-term performance of HVDC cables?

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Thank you very much for your attention!

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