This International Standard is applicable to newly manufactured current transformers used for measuring, protection and/or control applications in DC Power systems with a voltage above 1 kV. The general configuration of a low power instrument transformer is described in the figure 601 of IEC 61869-6. With respect of it, different configurations are possible for the current transformers and are illustrated in the different block diagrams of the figure 1401. NOTE According to the definition of the ratio error, the accuracy of the current transformer will be measured at the secondary terminals