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Pole Transformer Tank Rust.

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I noticed a grey painted pole mounted transformer today. The cooling oil tank and one side of the transformer was very rusty. Just what is the metal thickness of the cases of these transformers? When will it rust through and spill its cooling oil?


Z.
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    Zoomup:

    So I suppose that the transformer normally runs quite cool up on its pole. The cooing oil may not be essential if it leaks out and the transformer is lightly loaded. Or is it essential for insulation as well as cooling?


    Z.


    It may well work dry for a while, but yes it will overheat, a lot, with what should be normal loads, the oil is a large part of the cooling ability. The other problem is if oil can get out then damp air and then condensation is getting in,  even new transformers are enamelled wire (think varnish)  and oily paper, and water is not your friend.

    Mike


    PS Dry type transformers do exist, usually epoxy filled  but for the same power are larger heavier units,more prone to overheating if they experience overload. As a result, they have higher electrical losses, and it is more expensive to run over time. Oil units are smaller and more efficient. They require less copper and create a smaller environmental footprint .


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  • 0
    Zoomup:

    So I suppose that the transformer normally runs quite cool up on its pole. The cooing oil may not be essential if it leaks out and the transformer is lightly loaded. Or is it essential for insulation as well as cooling?


    Z.


    It may well work dry for a while, but yes it will overheat, a lot, with what should be normal loads, the oil is a large part of the cooling ability. The other problem is if oil can get out then damp air and then condensation is getting in,  even new transformers are enamelled wire (think varnish)  and oily paper, and water is not your friend.

    Mike


    PS Dry type transformers do exist, usually epoxy filled  but for the same power are larger heavier units,more prone to overheating if they experience overload. As a result, they have higher electrical losses, and it is more expensive to run over time. Oil units are smaller and more efficient. They require less copper and create a smaller environmental footprint .


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