CHAPTER 6: ACTUAL VALUES METERINGG30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL 6-1766.4.2 Transformer6.4.2.1 Differential and restraint currentsACTUAL VALUES METERING TRANSFORMER DIFFERENTIAL AND RESTRAINTThe metered differential current, restraint current, second harmonic current, and fifth harmonic current are displayed foreach phase. See the Percent Differential section in chapter 5 for details on how these values are calculated.If differential current in any phase is below the hard-coded cutoff of 0.04 pu, then the differential, 2nd harmonic, and 5thharmonic currents are forced to zero.6.4.2.2 Thermal elementsACTUAL VALUES METERING TRANSFORMER THERMAL ELEMENTS DIFFERENTIAL AND RESTRAINT REFERENCE WINDING:Winding 1 DIFF PHASOR Iad:0.000 pu 0.0° REST PHASOR Iar:0.000 pu 0.0° DIFF 2ND HARM Iad:0.0% fo 0.0° DIFF 5TH HARM Iad:0.0% fo 0.0° DIFF PHASOR Ibd:0.000 pu 0.0° REST PHASOR Ibr:0.000 pu 0.0° DIFF 2ND HARM Ibd:0.0% fo 0.0° DIFF 5TH HARM Ibd:0.0% fo 0.0° DIFF PHASOR Icd:0.000 pu 0.0° REST PHASOR Icr:0.000 pu 0.0° DIFF 2ND HARM Icd:0.0% fo 0.0° DIFF 5TH HARM Icd:0.0% fo 0.0° THERMAL ELEMENTS TOP OIL °C:70°C HOTTEST-SPOT °C:130° AGING FACTOR:1.2 DAILY RATE LOL:15 hrs XFMR LIFE LOST:100000 hrs
