GE Multilin 745 Instruction Manual

A2 Metering 745Transformer Management RelayActual Valueshttp://www.GEindustrial.com/multilin 6ñ9GE Multilinc) Total Harmonic Distortion (THD)PATH: ACTUAL VALUES !" A2 METERING !" HARMONIC CONTENT !" THDTHD is calculated and displayed. Every THD value is calculated as the ratio of theRMS value of the sum of the squared individual harmonic amplitudes to the RMSvalue of the fundamental frequency. The calculations are based on IEEE standard519-1986.The actual values messages display the total harmonic distortion for phase A, B, andC currents for Windings 1 through 3, expressed as a percentage of the fundamentalfrequency component. The numbers in parentheses indicate the programmedfrequency band (in terms of harmonic number) over which THD is being calculated.d) Harmonic Derating FactorPATH: ACTUAL VALUES !" A2 METERING !" HARMONIC CONTENT !" HARMONIC DERATINGThe Harmonic Derating Factor for each of the windings shows the effect of non-sinusoidal load currents on power transformerís rated full load current. Thecalculations are based on ANSI/IEEE standard C57.110-1986. The actual valuesmessages display the harmonic derating factor for Windings 1 through 3.! THD [!] W1 THDa (2nd-21st):0.0% ÉoMESSAGE W1 THDb (2nd-21st):0.0% ÉoMESSAGE W1 THDc (2nd-21st):0.0% ÉoMESSAGE W2 THDa (2nd-21st):0.0% ÉoMESSAGE W2 THDb (2nd-21st):0.0% ÉoMESSAGE W2 THDc (2nd-21st):0.0% ÉoMESSAGE W3 THDa (2nd-21st):0.0% ÉoMESSAGE W3 THDb (2nd-21st):0.0% ÉoMESSAGE W3 THDc (2nd-21st):0.0% Éo! HARMONIC [!]DERATINGW1 HARMONIC DERATINGFACTOR: 1.00MESSAGE W2 HARMONIC DERATINGFACTOR: 1.00MESSAGE W3 HARMONIC DERATINGFACTOR: 1.00