This standard ( Part 4 ) gives requirements and test for protective current transformers for special purpose applications such as balanced protective systems and distance protection schemes. It also applies to protec-tive cores of multi-core current transformers for suGh applications.
IS 2705 Pt.4-1992 history
1992IS 2705 Pt.4-1992 Current Transformers—Specification Part 4 Protective Current Transformers for Special Purposes
1981IS 2705 Pt.4-1981 Current Transformer Specifications Part IV Protective Current Transformers for Special Purposes