Video library

Technical videos on transformers and substations

Pieces under a minute answering one concrete maintenance question. Each carries a full transcript and a link to the test, the service or the case the figures come from.

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Every video starts from a question that comes up in the field — what to address first, whether new oil is already in condition, what to do when a protection operated — and answers it with what was measured. Below the player you will find an English translation of what is said, the verbatim Spanish transcript, the technical context and the page where each figure can be checked.

Audio is in Mexican Spanish and the captions are Spanish too. The presenter in these videos is a character generated with artificial intelligence: the image and the voice do not belong to TEVKO personnel. The technical content and the figures quoted come from documented work and from the pages linked on each page.

AI-generated spokesperson in a red shirt introduces the decision between rehabilitating and replacing a transformer.

Repair or replace a transformer? Measured condition is what decides

Whether to rehabilitate or replace a transformer is not settled by the unit's age but by what the electrical tests measure and by the condition of the insulating paper. With that diagnosis, maintenance can justify the route to operations and procurement.

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AI-generated spokesperson in a red shirt explains how to rank priorities in a transformer maintenance programme.

The maintenance window is booked: what do you address first?

Having a maintenance date does not define the scope. Electrical tests identify findings and rank them, so the outage window is spent on what the condition of the equipment points to rather than on a generic checklist.

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AI-generated spokesperson in a red shirt explains what evidence should be handed over when an electrical maintenance closes.

The maintenance is over: what evidence should you be left holding?

A maintenance handover is documented with the tests in the agreed scope, their results and the recommendations. That evidence lets a team review the intervention, explain what is still open, and set the follow-up.

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AI-generated spokesperson in a red shirt presents a case where new oil was tested before being loaded into a transformer.

Is new oil already in condition? What the test measured before it was loaded

During an oil change on a 2,000 kVA transformer, the new oil was tested before being loaded: it averaged 19.79 kV of dielectric strength across five runs, with readings as low as 12.0 kV, against a reference criterion above 30 kV.

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AI-generated spokesperson in a red shirt presents a case of pole-by-pole contact resistance measurement at a 115 kV substation.

Every breaker passed the test: does that mean they are all the same?

During maintenance at a 115 kV substation the breakers met the contact-resistance criterion and the overall verdict was good. Even so, four showed pole-to-pole spread well above the rest: on one it reached 75.72 %.

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AI-generated spokesperson in a red shirt explains what to do when a transformer's gas relay operates.

The gas relay or the pressure relief valve operated: what to do before re-energising

If the gas relay or the pressure relief valve operated, it is worth diagnosing the transformer before energising it again: re-energising with an internal fault can aggravate damage that was still repairable.

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AI-generated spokesperson in a red shirt explains when a frequency response test on a transformer is worth running.

Transport, short circuit or earthquake? When an SFRA test is worth running

Damage to the windings is not always visible from the outside. Frequency response analysis compares the transformer's fingerprint against a reference and can reveal deformation that other tests may not show.

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