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Corona shields for thyristor valves at ultra-high voltages
01 May, 2009
UHVDC operating levels present a particular challenge for the insulation of thyristor valves. AREVA T&D’s R&D teams have carried out electric field stress studies to determine the best profile for the corona shields, built a test object and subjected it to DC and switching impulse tests that validated the theoretical model. The end result after the next phase of development will be a new design of corona shield, suitable for DC applications up to 800 kV.
Vegetable or mineral? – transforming choices for DSOs
01 March, 2009
EdF has introduced an edible oil made from soya beans on to its grid reinforcement menu, and is currently trialling its qualities in comparative tests on two 132 kV distribution transformers in the UK.