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trasformatori in resina - Cabel Energy

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AVVOLGIMENTO A.T.<br />

H.V. WINDINGS<br />

Realizzati con s<strong>in</strong>gole bob<strong>in</strong>e costruite <strong>in</strong> filo o nastro di<br />

allum<strong>in</strong>io <strong>in</strong>teravvolte con film isolante, <strong>in</strong>colonnate <strong>in</strong><br />

apposito stampo nel quale, dopo il trattamento di<br />

riscaldamento, viene colata sotto vuoto res<strong>in</strong>a epossidica<br />

caricata.<br />

A seguito di processo di polimerizzazione e distensione con<br />

tempi e temperature controllate si ottiene una colonna<br />

compatta con avvolgimenti protetti da adeguato spessore di<br />

res<strong>in</strong>a per garantire l'isolamento: delle spire delle bob<strong>in</strong>e di<br />

colonnna fra le colonne con il secondario con la massa<br />

l'<strong>in</strong>nesco delle scariche parziali.<br />

Questa tecnologia permette di costruire colonne i cui<br />

conduttori sono protetti dall' umidità e da altri agenti<br />

ambientali aggressivi.<br />

La res<strong>in</strong>a impiegata possiede ottime caratteristiche di<br />

<strong>in</strong><strong>in</strong>fiammabilità e autoest<strong>in</strong>guenza.<br />

REGOLAZIONE DEL RAPPORTO DI TRASFORMAZIONE<br />

REGULATOR OF THE TRANSFORMATION RATIO<br />

Apposite morsettiere previste su ciascuna delle colonne AT e<br />

manovrabili a trasformatore dis<strong>in</strong>serito dalle reti AT e BT<br />

consentono la regolazione del rapporto di trasformazione per<br />

variazioni del 2x2.5%.<br />

SUPPORTI COLONNE<br />

COLUMNS BEARING<br />

Gli avvolgimenti MT e BT sono sostenuti e registrati per<br />

mezzo di supporti isolanti elasticizzati ancorati dentro<br />

all'armatura del nucleo.<br />

Questi supporti permettono di compensare assialmente le<br />

dilatazioni termiche ed attenuare le vibrazioni dovute alle<br />

variazioni del carico <strong>in</strong> esercizio.<br />

4<br />

They are made of s<strong>in</strong>gle coils of allum<strong>in</strong>ium strip or wire.<br />

The coils are wrapped together with an <strong>in</strong>sulated film,<br />

stacked up <strong>in</strong> a special mould where filled epoxy res<strong>in</strong> is cast<br />

after vacuum heat treatment.<br />

After a polymerisation and stress i reliev<strong>in</strong>g process with<br />

controlled time and temperature, a compact column is obta<strong>in</strong>ed<br />

with w<strong>in</strong>d<strong>in</strong>gs protected by a suitable res<strong>in</strong> thickness so as to<br />

guarantee the <strong>in</strong>sulation of the turns of the column coils<br />

between the columns between the primary and secondary<br />

w<strong>in</strong>d<strong>in</strong>g between the primary w<strong>in</strong>d<strong>in</strong>g and earth without<br />

strik<strong>in</strong>g any partial discharges.<br />

This technology allows to manufacture columns whose<br />

conductors are procected from moisture and other agressive<br />

environmetal agents.<br />

The res<strong>in</strong> used has excellent self-ext<strong>in</strong>guish<strong>in</strong>g and <strong>in</strong>flammable<br />

characteristics.<br />

Special term<strong>in</strong>al board on each HV column can be adjusted<br />

when the transformer is disconnected from the HV and LV. This<br />

allows the regulation of the transformer ratio for variations of<br />

2x2,5% and ,if mounted , the facilty to adjust the supplied<br />

voltage to units with two primary voltages.<br />

The HV and LV w<strong>in</strong>d<strong>in</strong>gs are supported and locked by<br />

means of elastic <strong>in</strong>sulat<strong>in</strong>g bear<strong>in</strong>g anchored to the core<br />

re<strong>in</strong>forcement.<br />

These bear<strong>in</strong>gs allows an axial compensation of thermal<br />

expansion and an attenuation of the vibration due to load<br />

variations.<br />

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