Cooler Bank Replacement


Transformers located in outdoor substations risk corrosive degradation from the weather. If left unprotected leaks will develop. This increases the risk of equipment failure as the insulating oil level drops, especially if no Buchholz or low level alarm protection exists on the transformer. Further, oil leaks can potentially cause environmental damage.

Cooling radiators on most types of transformer can be replaced on site if corrosion or oil leaks are so extensive that normal repair or painting cannot be carried out satisfactorily.

Transformer cooling radiator banks on large transformers can be replaced even if a new supporting structure is also required.

Plate radiator coolers can be designed and fitted on site by experienced Rosh Engineers. Full thermal calculations are carried out to ensure the new cooling banks give at least the same transformer rating, and if required, a higher rating.

Welded on type coolers can be removed and new, flanged, plate type radiators fitted without the transformers being returned to the factory. This minimises disruption, outage time and cost.

Cooling fitted to hermetically sealed transformers can be replaced and the tank modified to accommodate modern plate type radiators.

All radiators can be supplied with a range of protective coatings to suit the most onerous environmental conditions, including external hot dip galvanising.

Transformers with a corrugated tank design of cooling are particularly vulnerable. If corrosion becomes so severe that it is beyond protection with cleaning and painting as a leak has developed the cooling cannot be replaced. In these instances the transformer will need to be removed from site for a complete tank replacement.

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