GE Grid Solutions

GE Grid Solutions

Boulogne-Billancourt, Île-de-France

HVDC Disconnectors

HVDC Disconnectors

HVDC Disconnectors

Disconnectors (DSC) for HVDC applications are designed to specific constraints and requirements typical for DC applications, that are quite different compared to AC applications. They are requested to withstand DC voltage open gap and to ground to ensure safety for the people in the substation and to permit proper and safe layout configuration. In some cases, like for filter applications, they are requested to break a sum of harmonic currents at a certain voltage (amply smaller than the rated voltage of the disconnector) due to the ripple created by harmonics on the reactances.

All these DC disconnectors take benefit of huge experience and installed base of AC disconnector technology delivered worldwide in regards to design technology and quality e.g. supplier qualification, assembly processes or ISO conformity.

Key Features

  • Self protected design of contacts (L-type contact) preventing pollution deposit and hot spots
  • HVDC design of post insulators
  • High value of minimum creepage distance enforcing height
  • Dedicated shed profiles
  • Specific layout design (also 2 or 3 post insulators for each contact side)
  • High seismic performances
  • Special design of anti-corona rings

Overview

Globally the utility environment is becoming more complex and utilities are having to manage new challenges such as:

  • Increasing demand for electricity
  • Connection of remote generation
  • Growth of distant offshore wind
  • Integration of variable renewable generation
  • Need for security of supply
  • Reduce carbon footprint
  • Land costs becoming more expensive
  • New right-of-way access permits increasing difficult to obtain

The only choice for many utilities is to restructure their grid systems to manage these challenges. Utilities are looking for cost effective solutions to transfer power and to improve the quality, stability and reliability of the grid which will anticipate their needs for the next 20 to 50 years.

GE's Solution

High Voltage Direct Current (HVDC) solutions are ideal for supporting existing AC transmission systems or for building new power highways. HVDC is a system which interconnects two AC networks, converting AC voltage to DC voltage, and DC voltage to AC voltage utilizing power electronics technology. HVDC systems enable transfer of power, interconnection of grids, integration of renewables and maximize grid performance.

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