CHAPTER 6: METERING CURRENTS
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–9
Zero Sequence (I_0)
Range: 0.000 to 12000.000 A
Positive Sequence (I_1)
Range: 0.000 to 12000.000 A
Negative Sequence (I_2)
Range: 0.000 to 12000.000 A
Zero Sequence (I_0 Angle)
Range: 0.0 to 359.9°
Positive Sequence Angle (I_1 Angle)
Range: 0.0 to 359.9°
Negative Sequence Angle (I_2 Angle)
Range: 0.0 to 359.9°
Ground Differential (Igd)
Range: 0.000 to 12000.000 A
Ground Differential Angle (Igd Angle)
Range: 0.0 to 359.9°
Load (I%)
Range: 0.0 to 100.0 %
NOTE:
Percent of load-to-trip is calculated from the phase with the highest current reading. This
metered value is the ratio between the highest phase current injected for the current bank,
and the lowest pickup setting among all Phase Timed and Instantaneous overcurrent
elements. If all these elements are disabled, the value displayed is "0".
For example, if the lowest pickup is 0.5 xCT, and the highest injected phase current is 1 xCT,
the displayed value for load-to-trip is 200%.
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