Company involved in production of primary aluminum with 8 rectifiers transformers

Nameplate data of the transformers:

Transformer: rectifier, ODAF with membrane
Manufact: xxx
Year: 1998
Power [MVA]: 93,4
Voltage [KV]: 66
Oil mass [Kg]: 27.200
Oil type: naphthenic

Step 1

First failure with discharges of high energy (D2)

Step 2

Post failure analysis, oil fingerprint with identification ant quantification of the copper sulphide on enameled contacts

Step 3

Sea Marconi expertise recommended the selective depolarization treatment (Chedcos)

Identified Critical issues

Applied solutions

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