6.3.The allowable error of the transformation ratio is ±0.5% in the position of the rated tap.6.4.The three-phase connecting group must be consistent with the design requirement and signs on the nameplate and shell.6.5.After the circulating operation, conduct the measurement of the DC resistance and voltage ratio of the winding with the bushing under all branch connection. The testing result should conform to the standard requirement.6.6.After the circulating operation, conduct the measurement of the DC resistance and voltage ratio of the winding with the bushing under all branch connection. The testing result should conform to the standard requirement.6.7.Related calculations