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The behaviour of four medium voltage circuit-breakers using different breaking techniques has been compared under actual service conditions with reference to industrial plants.Test conditions not fully covered by the International Standard were chosen.Description of the laboratory circuits and the test methodology have been reported.

The paper examines the influence of the overvoltages due to fault initiation and clearing on the choice of the air clearances of UHV lines. The study is carried out with particular reference to a network structure representative of the first stage of development of a UHV grid-type system,

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