" Pre-energisation" refers to the phase that includes activities prior to energisation of the transformer and therefore mainly activities of installation of equipment at the final site and filling with purchased and accepted oil.
In detail, when the transformer reaches its operating site, a series of activities is performed that fall under the name of installation or commissioning; for example, recorded logs are read by sensors during transportation of the transformer, the dew point is monitored to provide guidance on the moisture inside the casing (typically < 20 °C), dopodiché si procede al montaggio degli accessori, alle connessioni elettriche, ai sistemi antincendio, ai sistemi di protezione ambientale, alle integrazione di sistema, ed al filled with oil that has been selected and accepted).
The filling is an extremely delicate operation that requires the intervention of qualified experts and the use of appropriate operating procedures, with suitably trained personnel and state of the art plant equipment. In concrete terms, the first step is to place the transformer under vacuum, then proceed with the filling with the new insulating oil, and then moving on to treatment of the oil until the contaminants reach the thresholds set out in relation to regulatory, technical and contractual conditions (see pre-energisation table, IEC 60422).
IEC 60422 and 4 2013 – Table 3 - Recommended limits for mineral insulating oils after filling in new electrical equipment prior to energisation
In this phase, Sea Marconi is able to support owners in the supervision and installationof the oil-transformer system(and of its accessories).
In concrete terms, Sea Marconi performs:
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Do you know the correct procedures for vacuum filling? And for the next treatment?
Contact us for performing the activity or for simple advice
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Do you want to verify that the oil just pumped into the transformer complies with regulatory parameters?
Contact us for a targeted quotation
- Sea Marconi has developed the sector's largest private database with over 70,000 devices and 240,000 diagnoses.
- Accredited and state of the art analyses are performed. In 2017 alone, 17,500 samples of insulating oil from about 10,000 transformers were analysed.
- Equipped with a full field kit set to obtain a first screening of oil directly in the field (screening of PCBs, acidity and total corrosive sulfur)
IEC 60422 ed. 4.0 - 2013-> Mineral insulating oils in electrical equipment – Supervision and maintenance guidance
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