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The number before 'P' is the percentage error, and the number after is the Accuracy Limit Factor (ALF) . For example, a 5P20 CT has less than 5% error at 20 times its rated current.
This standard is part of a larger family (the IEC 61869 series) that modernized the industry by replacing older standards like IEC 60044-1 and IEC 60044-6. It is intended to be used in conjunction with the general requirements outlined in IEC 61869-1 . 2. Key Technical Innovations
Protective CTs with low remanence (residual magnetism).
The number before 'P' is the percentage error, and the number after is the Accuracy Limit Factor (ALF) . For example, a 5P20 CT has less than 5% error at 20 times its rated current.
This standard is part of a larger family (the IEC 61869 series) that modernized the industry by replacing older standards like IEC 60044-1 and IEC 60044-6. It is intended to be used in conjunction with the general requirements outlined in IEC 61869-1 . 2. Key Technical Innovations
Protective CTs with low remanence (residual magnetism).
