Stator Inter-Turn Fault - GE 869 Instruction Manual

CHAPTER 6: METERING

Stator Inter-Turn Fault

Bearing, Mechanical and Stator Fault
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Path:
Metering > Motor > Stator Inter-Turn Fault
OPERATING QUANTITY
Range: 0.000 to 20.000 in steps of 0.001
Default: 0.400
This value represents the operating quantity of the Stator Inter-Turn Fault element.
LEARNED UNBAL Z
Range: 0.000 to 10.000 in steps of 0.001
Default: 0.200
This value represents the inherent asymmetries in the machine at the time of
commissioning and without stator inter-turn fault. This value is defined as Unbalance
Base Impedance (Z
UBbase
Turn Fault algorithm.
TIME OF LEARNED UNBAL Z CALC
Range: Date/Time Format (MM/DD/YY HH:MM:SS)
Default: 01/01/08 00:00:00
This value represents the time when the learning phase has finished the calculation of
the last averaged Unbalance Base Impedance (Z
MAX OPERATING QUANTITY
Range: 0.000 to 20.000 in steps of 0.001
Default: 0.500
This value represents the maximum of the operating quantity.
MAX LEARNED UNBAL Z
Range: 0.000 to 10.000 in steps of 0.001
Default: 0.200
This value represents the maximum of the learned Unbalance Base Impedance (Z
Path:
Metering > Motor > Bearing Fault Baseline
Path: Metering > Motor > Bearing Fault Monitoring
Path:
Metering > Motor > Mech Fault Baseline
Path:
Metering > Motor > Mech Fault Monitoring
Path:
Metering > Motor > Stator Fault Baseline
Path: Metering > Motor > Stator Fault Monitoring
AVG NORM PEAK MAG at k = 1 (2 or 3)
Normalized peak magnitude in dB at each frequency is calculated as the ratio of FFT
magnitudes at specific frequency and at fundamental frequency for each k-factor. These
normalized peak magnitude values are computed and stored continuously during baseline
mode for each load bin and k-factor. All the dB values are averaged for each load bin and
k-factor and stored as Avg. Norm Peak Mag @ k=1,2,3 in a file at the end of baseline period.
AVG ENERGY AT PEAK MAG at k=1 (2 or 3)
Energy magnitude is extracted as the area within +/- vicinity (0.5 Hz) of frequency (for each
k-factor) corresponding to the highest normalized peak magnitude. These energy values
are computed and stored continuously during baseline mode for each load bin. All the dB
values are averaged for each load bin value and stored as Avg. Energy at Peak Mag at
k=1,2,3 in a file at the end of the baseline period.
) and calculated during the learning phase of the Stator Inter-
UBbase
).
MOTOR
).
UBbase
6–7