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CT Requirements for 7SR23 Protection by Danish Mohammed is a document available to read on EtoBox.

For high impedance protection using the 7SR23, it is recommended to use low reactance CTs that conform to IEC61869-2 Class PX, which have specific excitation characteristics and resistance for optimal performance. All current transformers should maintain an equal turns ratio, and the knee-point voltage must exceed twice the setting voltage. Additional specifications for CTs can be found on Siemens

Author

Danish Mohammed

Language

EN