Ligne 225 KV - (Bayet-Enval)

### Nombre de pylônes:

243 supports :239 pylônes à 3 triangles + 2 chats + 1 nappe + 1 pylône à 6 triangles

## Présentation :

La ligne Bayet-Enval est une ancienne liaison à 225 000 volts reliant Clermont-Ferrand au poste d'interconnexion de Bayet. Elle est aujourd'hui sectionnée en 2 lignes distinctes.

Chargement de la 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class=\"mw-parser-output\"\u003E\u003Cp\u003EBayet\n\u003C/p\u003E\u003C/div\u003E","title":"Bayet\n","link":"","lat":46.27308532267334,"lon":3.2933001421559593,"icon":""},{"text":"\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EEnval\n\u003C/p\u003E\u003C/div\u003E","title":"Enval\n","link":"","lat":45.765601007842314,"lon":3.000369633189246,"icon":""}]}
## Historique :

La ligne fut construite par la *Société de Transport d'Energie du Centre (*STEC) au début des années 1930 et était initialement exploitée en 150 KV. Elle faisait partie d'une grande continuité établie entre Rueyres et Gueugnon pour relier le bassin industriel et minier de Saône-et-Loire avec le puissant complexe hydroélectrique Sarrans-Brommat sur la Truyère.

Le poste de Bayet permettait alors un maillage avec les autres sites industriels de la région (grâce aux lignes Bayet-Roanne et Bayet-Montluçon) tandis que celui d'Enval assurait l'interconnexion avec le réseau de la Compagnie Hydro-Electrique d'Auvergne (CHEA).

Au début des années 1980, le réseau se restructure en Auvergne et le réseau 150 KV tend à disparaitre. La tension de la ligne est ainsi relevée à 225 KV en 1981. A cette occasion, la plupart des pylônes est équipée de chaines d'isolateurs doublées.

La ligne est interrompue en 1992 avec la mise en service du poste 225 KV de Volvic, pour renforcer l'alimentation de l'agglomération de Riom. 12 pylônes "double drapeaux" (exploités sur un seul circuit) sont alors mis en place pour la détourner de son tracé et la raccorder au nouveau poste.

## Description du tracé :

* La ligne, d'orientation Nord-Sud, suit un tracé globalement rectiligne sur tout son parcours.
* Depuis le poste de Bayet, elle évolue d'abord en plaine et suit plus ou moins la D2009 (ex N9) jusqu'à Gannat, franchissant la Sioule à 1 km au Sud de Bayet.
* A partir de Gannat, la ligne traverse un relief plus vallonné. Elle croise l'A719 au nord de la ville puis franchit les vallées du Gouënant et de l'Andelot.
* Elle passe ensuite au dessus de la carrière de Vensat puis suit l'A71 qu'elle traverse à Beauregard-Vendon. Au sud de l'autoroute, elle chemine entre Riom et Volvic, passant dans la zone industriel de Mozac.
* A partir de Volvic, la ligne monte sur la chaine des Puy. Elle croise la voie ferrée Clermont-Eygurande au niveau de Sayat, traverse Orcines puis entre finalement dans le poste d'Enval.

## Tronçons récupérés pour la création de nouvelles lignes :

* Ligne 225 KV - (Bayet-Volvic)
* Ligne 225 KV - (Volvic-Enval)