00 where K n is the rated transformation ratio; I p is the actual primary current; I s is the actual secondary current when I p is flowing, under the conditions of measurement. 2.1.11 phase displacement the difference in phase between the primary and secondary current vectors, the direction of the vectors being so chosen that the angle is zero for a perfect transformer [IEV 321-01-23 modified] The phase displacement is said to be positive when the secondary current vector leads the primary current vector. It is usually expressed in minutes or centiradians. NOTE This definition is strictly correct for sinusoidal currents only. 2.1.12 accuracy class a designation assigned to a current transformer the errors of which remain within specified limits under prescribed conditions of use
全文预览
