PROJECT TITLE :
Stress conditions in HVDC equipment and routes to in service failure
ABSTRACT:
High voltage equipment designed for DC applications is stressed differently from ac equipment. Most notably, the load conditions of the equipment play a major role in determining the electrical field distribution in insulation underneath dc, thanks to the temperature dependence of conductivity. Additionally, polarization and area charge phenomena impose a time dependent behavior on the strain distribution. This has major consequences for the method in that degradation of the insulation underneath dc stress takes place. The nature of the stresses under dc may lead to accelerated degradation processes which might end in early breakdown of the insulation. This paper provides an outline of the stress conditions specific for dc application and highlights via that routes they'll cause failure. The strain distributions in converter transformers and dc cable systems can serve as typical examples.
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