When a transformer arrives at a site, several key inspection points are crucial to ensure its proper installation and functioning.Here we provide Key inspection point while Transformer arrive at site.
Check Nitrogen pressure if Transformer without oil filled
Check whether the transformer has arrived at site with a positive gas pressure ( 0.2kg/cmsq) in case of dispatch without oil. Two back up N2 cylinder having high pressure of 120-140kg/cmsq and N2 regulator provided.
Use only N2 to IS 1747 with 50ppm moisture and 1% oxygen by volume. Dry nitrogen (-55˚C) to be used to determine dew point of insulation. If storage time exceeds 3 months transformer filled with oil rather then maintain N2 pressure.Gas cylinder to maintain positive pressure during storage.
Should the transformer arrive at site without pressure (owing to gas leakage), it must be assumed that moisture has entered the tank and that the moisture will have to be driven out. In such cases, the manufacturer’s advice must be sought.
Check Oil level and leakage if Transformer with oil filled
In case of dispatch of main body in oil filled condition, check oil level and leakages if any than informed to manufacture company.
In case of any oil leakage or damage is discovered, the transportation company, the transport insurer and manufacturer shall be informed immediately.
For oil filled transformers a sample of oil should be taken from the bottom of the tank and tested for BDV and moisture content. If the values do not meet the relevant standards the matter should be taken up with the manufacturer.