Overall Differential Current; Speed - GE 889 Instruction Manual

GENERATOR

Overall Differential Current

FASTPATH:

Speed

6–6
The phasors of differential and restraint currents are displayed in primary amperes.
Path:
Metering > Generator > Overall Differential
la Overall Differential (Ia Ovrl Diff)
Range: 0.000 to 1000.000 x CT in steps of 0.001
lb Overall Differential (Ib Ovrl Diff)
Range: 0.000 to 1000.000 x CT in steps of 0.001
lc Overall Differential (Ic Ovrl Diff)
Range: 0.000 to 1000.000 x CT in steps of 0.001
la Overall Restraint (Ia Ovrl Restr)
Range: 0.000 to 1000.000 x CT in steps of 0.001
lb Overall Restraint (Ib Ovrl Restr)
Range: 0.000 to 1000.000 x CT in steps of 0.001
lc Overall Restraint (Ic Ovrl Restr)
Range: 0.000 to 1000.000 x CT in steps of 0.001
la Differential 2nd Harmonic (Ia Diff 2nd Harm)
Range: 0.0 to 100.0% in steps of 0.1
lb Differential 2nd Harmonic (Ib Diff 2nd Harm)
Range: 0.0 to 100.0% in steps of 0.1
lc Differential 2nd Harmonic (Ic Diff 2nd Harm)
Range: 0.0 to 100.0% in steps of 0.1
la Differential 5th Harmonic (Ia Diff 5th Harm)
Range: 0.0 to 100.0% in steps of 0.1
lb Differential 5th Harmonic (Ib Diff 5th Harm)
Range: 0.0 to 100.0% in steps of 0.1
Ic Differential 5th Harmonic (Ic Diff 5th Harm)
Range: 0.0 to 100.0% in steps of 0.1
The values for differential and restraint currents are displayed in per times CT. The CT
primary, from the K2 CT Bank assigned as Signal Input for Winding 1, is the reference CT
(base CT) used for estimating the differential and restraint currents. The winding reference
is explained in the Transformer Setup section.
Path:
Metering > Generator > Speed
SPEED
Range: 0 to 8640 RPM in steps of 1
Default: 0
889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: METERING