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Are shielding electrodes necessary for HVDC line insulators?

pubblicazioni - Memoria

Are shielding electrodes necessary for HVDC line insulators?

Nello studio viene discussa la necessità elettrodi di schermatura per linee DC, tenendo conto di tutte le funzioni che gli elettrodi schermatura devono coprire e del fatto che la distribuzione di tensione è generalmente dominata da correnti resistive sia in condizioni pulite che contaminate.

Shielding electrodes may be essential in AC to mitigate the voltage drops/electric field on the insulators, especially on the insulator section line side. The situation is different in DC where the voltage distribution is generally dominated by resistive currents both in clean and contaminated conditions. Electric field calculation are reported of the electric field distribution along composite insulators showing that in practical service conditions shielding electrodes would not have any capacity to control the voltage distribution.

On the basis of the study the need of shielding electrodes for DC lines is discussed, taking into account all the functions shielding electrodes have to cover (local corona prevention, grading function, power arc protection function).

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