Speed - GE MI-869 Instruction Manual

MOTOR

Speed

Broken Rotor Bar
NOTE:
6–6
FLTD RMS Cur A/B/C
Range: 0.000 to 120000.000 A
This value represents the filtered value of the RMS phase current A/B/C. The filtered RMS
phase current represents the moving average of the RMS values obtained by using the
motor load averaging filter of length equal to the setpoint Motor Load Filter Interval (set
under System/Motor/Setup). The Motor load averaging filter is only applicable when
Motor Load Filter Interval is set non-zero. Otherwise, this value is equal to the platform
RMS phase current. See figure "Motor Load Averaging Filter for VFD and Cyclic Load
Motor Applications".
FLTD MAG Cur A/B/C
Range: 0.000 to 120000.000 A
This value represents the filtered value of the phasor magnitude (Mag) phase current A/
B/C. The filtered Mag phase current represents the moving average of the Mag values
obtained by using the motor load averaging filter of length equal to the setpoint Motor
Load Filter Interval (set under System/Motor/Setup). The Motor load averaging filter is
only applicable when the Motor Load Filter Interval is set non-zero. Otherwise, this value
is equal to the platform phasor magnitude phase current. See figure "Motor Load
Averaging Filter for VFD and Cyclic Load Motor Application".
Path:
Metering > Motor > Speed
SPEED
Range: 0 to 8640 RPM in steps of 1
Default: 0
The effective operating quantities of the Broken Rotor Bar element are displayed here.
Path: Metering > Motor > Broken Rotor Bar
The algorithm runs only for the "Motor Running" condition and is blocked on any other
motor status. The sample gathering and processing takes approximately 11 seconds in 60
Hz and 13 seconds in 50 Hz system, after all blocks are removed and all supervising
conditions are satisfied.
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: METERING