GE P24DM Technical Manual

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Secondary Internal Fault Current Recommended Metrosil types for various voltage settings50A600A/S1/S1213C = 540/64035 mA RMS600A/S1/S1214C = 670/80040 mA RMS600A/S1/S1214C =670/80050 mA RMS600A/S1/S1223C = 740/87050 mA RMS100A600A/S2/P/S1217C = 470/54070 mA RMS600A/S2/P/S1215C = 570/67075 mA RMS600A/S2/P/S1215C =570/670100 mA RMS600A/S2/P/S1196C =620/740100 mA RMS150A600A/S3/P/S1219C = 430/500100 mA RMS600A/S3/P/S1220C = 520/620100 mA RMS600A/S3/P/S1221C = 570/670100 mA RMS600A/S3/P/S1222C =620/740100 mA RMSIn some situations single disc assemblies may be acceptable, contact General Electric for detailed applications.Note:The Metrosils recommended for use with 5 Amp CTs can also be used with triple pole devices and consist of three single poleunits mounted on the same central stud but electrically insulated from each other. To order these units please specify "Triplepole Metrosil type", followed by the single pole type reference. Metrosil for higher voltage settings and fault currents areavailable if required.2.8 USE OF ANSI C-CLASS CTSWhere American/IEEE standards are used to specify CTs, the C class voltage rating can be used to determine theequivalent knee point voltage according to IEC. The equivalence formula is:V C rating in volts RK CT= +1 05 100. ( )P24xM Chapter 9 - Current Transformer RequirementsP24xM-TM-EN-2.1 199