Topics of the Symposium
TOPIC 1:
- Progress on the understanding of physical phenomena and materials for DC applications
- What are the choosing's criterias? How fast do they change?
- Nanotechnologies
- Thermoplastic insulation, XLPE low byproducts
- Ageing dynamics, Stresses on polarity reversals
- Environmental and end-of-life considerations (carbon, pollution, recyclability)
- Behavior of DC cables in Alternative for flexible system
- How to evaluate electric fields at triple points
Topic 2:
- The very high voltage in DC: 500 kV in extruded cables, is it actual?
- Standardization in progress, Extension of qualification
- Development and qualification tests up to 500 kV, including high-gradient prototypes
- What standardization? The TB 496 covers the 500 kV, not the IEC. Are today standards functionals?
- Focus on accessories
Topic 3:
- HVDC LS corridor projects in Europe, possibility of hybrid systems
- How to lower costs and LCOE? Overall economic aspects including civil engineering
- Production capacities for very long lengths
- Optimization of the overall electrical system and integration of HVDC links within an HVAC system, particularly from the point of view of exploitation (eg INELFE)
Topic 4:
- Submarine connections HVDC: state of the art in extruded and paper, transmitted power
- Suggestion to extend to the state of the art for any type of insulation, LS and LSM
- Feedback, fault, coordination with converters
- Special installation methods (deep underwater, viaducts, etc.)
Topic 5:
- Converters: technical coordination of cables/converters interfaces
- Use in renewal of extruded cables with LCC converters
- JWG B4 / C4 / B1.73
- Coordination for selecting values of lightning shocks or operation's shocks (role of B4 and B1 to standardize values)
- Focus on DC switching equipment
- Influence of harmonics, behavior in the event of faults and reversal of polarity. B.4.68 is working on DC harmonics and filtering, which will be well under way. B1- C4.73
on Isolation Coordination