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Volume 15 treats a maintenance programme as a set of bets about how a unit actually fails. This module names the three words a work order tends to mix: maintenance, repair, and refurbishment. It does not write a scope, price a rewind, or promise added life. A life figure without an inspection of this serial number is advertising.
Three different decisions
Maintenance is work done so that a mechanism you already understand does not get a head start. Breather service, fan replacement, tap-changer contact inspection at the interval the changer requires, and oil treatment when the oil — not the paper — is what has deteriorated, are maintenance. They presume the active part is still the active part the factory built. Repair is a response to damage: a leaking gasket, a failed bushing, a tap-changer diverter that has reached its contact life, a winding that has moved. The repair replaces or restores a part. It does not, by itself, reset the age of the paper that stayed behind. Refurbishment, sometimes called a rewind or a remanufacture, opens the active part and replaces enough of it that the unit’s remaining life is a new claim. That claim needs a new specification, a new dry-out, and a new test record. It is closer to a manufacture than to a service visit.
Choosing the wrong word changes the contract. A “repair” that quietly becomes a rewind has a different test list, a different drying requirement, and a different argument about what the nameplate still means. A “life extension” that changes the oil and paints the tank has maintained the unit. It has not rewound it. Say which parts will be replaced, which tests will be repeated, and which nameplate values are being re-declared.
The mechanism comes first
A programme that inspects everything on a fixed calendar, with no view of how this design fails, spends money on the wrong joints. Bushings, tap changers, oil preservation, and through-faults are common places a fleet actually loses units. The paid modules tie inspections to those mechanisms. This module asks only that the work order name the mechanism it is buying down, and that it not call a maintenance visit a new transformer.
- Maintenance keeps a sound active part in service. It does not reset paper age.
- Repair replaces a damaged part. The tests should match the part that was opened.
- Refurbishment re-declares capability. It needs a specification and a new test record.
- Name the mechanism. A calendar full of unrelated checks is not yet a programme.
Scopes, process steps, and a judgment of remaining life stay on the paid plan.
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