What are the requirements for transformer DC resistance

Do you know the requirements for the DC resistance of a transformer? DC resistance is a key indicator for checking the conductivity and connection quality of windings, and it is a mandatory test in electrical power testing. According to electrical regulations, the three-phase deviation has clear requirements: For transformers of 1600 kVA and below, the phase-to-phase deviation shall be ≤4%, and the line-to-line deviation (without neutral point) shall be ≤2%. For large-capacity equipment above 1600 kVA, the phase-to-phase deviation shall be ≤2%, and the line-to-line deviation shall be ≤1%.

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