Which of the following protective component is not provided on small distribution transformers?

Which of the following protective component is not provided on small distribution transformers? Correct Answer Buchholz relay

Class C dry-type transformers are those based on glass fibre-reinforced boards, aromatic polyamide paper conductor insulation and similar materials capable of operating at temperatures up to around 220°C. Generally small, lighter transformers are made of this type.
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2. hysteresis loss occurs in the transformers.
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Select the correct answer:
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Which of the following protection is normally not provided on small distribution transformers?
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