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This part of IEC 61869 provides all requirements specific to current transformers to be used in DC applications (DC CTs), whatever the technology used. The output signal can be analogue or digital. When it is analogue, it is available as low voltage representing the primary current.It is applicable to newly manufactured current transformers used for measuring, protection and/or control applications in power systems with a rated voltage above 1,5 kV DC.The general configuration of a single-pole low-power instrument transformer is described in Figure 1 of IEC 61869-1:2023.NOTE A bushing type current transformer, although having no primary insulation level for itself is often placed on a system with a nominal voltage > 1,5 kV DC and therefore falls within the scope of this document. Example: CT placed around an HV bushing or a cable.
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