Transformer oil to play its insulating, heat dissipation, arc extinguishing role, must have good electrical, chemical and physical properties. Oil exquisite degree of deep, low acid value, reduce equipment corrosion and insulation system to achieve the longest life, the acid value of the new oil are generally <0.01 mgKOH / g, running for 5 years will not have the acid value of the case of growth. New oil requires acid value ≤ 0.03 mgKOH / g, running oil requires acid value <0.10 mgKOH / g.
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