This standard ( Part IV ) gives requirements and tests for protective current transformers for special purpose applications, such as balanced protective systems and distance protection schemes.
Note — The general requirements for such current transformers are covered in Part I of this standard.
IS 2705 Pt.4-1981 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