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 Copper Sulphur Contamination
Where do sulphur compounds come from?
There is a varying level of sulphur compounds in the modern transformer oil and in the internal transformer components.
What is the origin of copper sulphide (Cu2S)?
Sulphur compounds act with heat on the contact with copper of the transformer windings, leads etc., thus leading to copper sulphide, which is more pronounced in sealed transformers.
The population of transformers affected by this contamination, because of their continuous usage more or less at full load (consequently leading to high temperature) is as follows:
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GSU (Generator Set-Up) transformers,
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reactors,
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rectifier transformers,
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furnace transformers.
Why is copper sulphide such a problem?
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It may lead to deposit of copper sulphur compounds in paper insulation.
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Copper sulphur compounds in paper insulation will lead to a weakened dielectric strength.
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Voltage of the conductors exceeds the insulation capacity of the paper insulation and the BIL rating.
RESULTING IN THE ARCHING BETWEEN THE WINDING TURN DISCS OR A SUBSEQUENT TRANSFORMER FAILURE.
What is the solution?
Based on the international study and recommendation along with our own experiences, AGECO International FZE offers a STOP solution for the reaction.
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