GE 869 Instruction Manual page 416

MONITORING
4–284
Figure 4-116: Fault indicating frequencies are highlighted
11. If the change in dB of peak and energy magnitude is greater than the pick up levels
configured in the ESA set points, then a corresponding fault element will be triggered
after the configured delay only if the level is sustained.
12. The dBs can be visualized in the form of a circle under the path Motor M&D\Bala's
Circle to know the motor status (normal, caution or alarm) as represented in the
following figure.
Figure 4-117: Motor status visually represented in circular format
– A circle is drawn with 3 dBs taken into consideration – baseline dB corresponding
to 'k' value where maximum change in dB is observed, PKP level 1 dB setting and
PKP level 2 dB setting as the radius of circles corresponding to the baseline,
caution and alarm zones.
– The entire circle is divided into 12 equal sections covering 30 degrees of
circumference corresponding to each load bin. Load bin 1 starts at 0 degrees and
ends with load bin 12 at the 360 degree point in the anti-clockwise direction.
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS