6-16 T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
METERING CHAPTER 6: ACTUAL VALUES
6
6.4.2 Transformer
6.4.2.1 Differential and restraint currents
ACTUAL VALUES METERING TRANSFORMER DIFFERENTIAL AND RESTRAINT
The metered differential current, restraint current, second harmonic current, and fifth harmonic current are displayed for
each 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 5th
harmonic currents are forced to zero.
6.4.2.2 Thermal elements
ACTUAL 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
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