GE MI-869 - Page 396

4–278 869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
MONITORING CHAPTER 4: SETPOINTS
Figure 4-108: Broken Rotor Bar Logic Diagram
894110A2.cdr
SETPOINTS
FUNCTION Disabled = 0 Alarm
AND
SETPOINTS
Block:
Off = 0
SETPOINTS
PICKUP:
Run
Ia
Va
DROPOUT DELAY:
SETPOINTS
PICKUP DELAY:
t
PKP
t
RST
SETPOINTS
Output Relays
Do Not Operate, Operate
FLEXLOGIC OPERANDS FLEXLOGIC OPERANDS
Broken Rotor Bar OP Broken Rotor Bar PKP
LED : PICKUP
(Largest Fault Component
/
DC Component)
> PICKUP
Phasor
Latched Alarm Configurable
OR
AND AND
OR
LATCH
S
R
RESET
Command
Set
Dominant
LED: ALARM
AND
0
SETPOINTS
START BLK DELAY
t
blk
SETPOINTS
MIN MOTOR LOAD: MAX LOAD DEV: MAX CURRENT UNBAL:
Motor Load
MOTOR VOLTAGE SUPERVISION:
AND
SETPOINTS
PICKUP:
Run
(Largest Fault Component /
Fundamental current
magnitude)
> PICKUP
AND
Secondary Voltage
Deviation < 5 v/sec
Power based FFT Current based FFT
OR
Actual Values
Load Deviation Current Unbal Min(Vab,Vbc,Vca)
< MIN MOTOR LOAD
> MAX LOAD DEV.
>MAX CURRENT UNBAL.
> MOTOR VOLTAGE SUPERVISION
Motor Running
FlexLogic Operand