6.7.1.The DC resistance value at different temperatures is converted according to the following formula:In the formula, R1 and R2 are the resistance values (Ω) when the temperature is t1 (℃) and t2 (℃);T-constant for calculation, 235 for copper wire and 225 for aluminum wire.6.7.2.Conversion of insulation resistance at different temperaturesTable 1 Temperature conversion coefficient of insulation resistance of oil-immersed power transformers