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Offer to repair services
In practice it happens that the repair service of transformers in the pursuit to lower its costs as much as possible limits to the minimum the possible tests at the beginning of repair of a damaged machine. The repaired machine changes in a “black-box” and during the repair some of the defects have are not disclosed. After putting the repaired machine in operation, problems may occur. The text emphasizes possible defects that do not have to be found after opening the machine for the repair.
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