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Theses

OPTIMISATION DES TECHNIQUES DE MISE A LA TERRE DES ECRANS DES CABLES HAUTE ET TRES HAUTE TENSIONS

Abstract : Underground links with insulated cables will be introduced in close future in the overhead grid for VHV electricity transmission. Various technological developments of the cables, their connecting equipments and their installation conditions were initiated in order to reduce the cost of these links. The optimization of the sheath grouding techniques also fits in this step. The thesis gives the theoretical bases for the definition of specifications to realize specially bonded underground links techniques (single point bonding and cross bonding) and proposes practical ru les for the design of cables sheath grounding. The studies having made it possible to obtain this result relate to the determination of overvoltages affecting the equipements. In the first part, a general method of calculation of stresses is established, on the one hand, in steady state and on the other hand during faults, consecutive either with an external fault or with a cable breakdown. In the second part, the stresses during transients, calculated using the Electromagnetic Transient Program (EMTP) are analyzed. The synthesis of these two kinds of studies leads to optimize the choice of the type of surge arresters to be implemented to protect the equipements with respect to the transients undergone by the cable sheaths " it also makes if possible to determine the maximum possible lengths for single point bonding underground links or the maximum lengths between cross-bondings, according to the stresses at power frequency.
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  • HAL Id : tel-00783703, version 1

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Hoang Vo van Huy. OPTIMISATION DES TECHNIQUES DE MISE A LA TERRE DES ECRANS DES CABLES HAUTE ET TRES HAUTE TENSIONS. Energie électrique. Institut National Polytechnique de Grenoble - INPG, 1999. Français. ⟨tel-00783703⟩

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