GE MI-869 - Page 401

CHAPTER 4: SETPOINTS MONITORING
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–283
Figure 4-109: Stator Inter-Turn Fault Protection logic diagram
894152A3.CDR
SETPOINT
Configurable FUNCTION:
Disabled=0
Alarm Latched Alarm
OR
SETPOINT
BLOCK: Off=0
SETPOINT
AND AND
OR
LED: ALARM
LATCH
S R
RESET
Command
FLEXLOGIC OPERAND
Stat Trn FLT 1 OP
SETPOINT
Output Relays
Do Not Operate, Operate
Learn Turn Fault Data:
SETPOINT
SETPOINT
NEG SEQ IMP AUTOSET:
NEG SEQ IMPEDANCE:
Learning Phase
Yes=1
AND
AUTO:
MANUAL:
Auto-Set Procedure
RUN
AND
Positive Sequence Current
Sequence Components
Positive Sequence Voltage
Negative Sequence Voltage
RUN
SETPOINT
NEG SEQ IMPEDANCE:
Monitoring Phase
SETPOINT
PICKUP STAGE 2:
OR
PICKUP DELAY STAGE 1:
SETPOINTS
DROPOUT DELAY:
t
PKP
t
RST
PICKUP DELAY STAGE 2:
SETPOINTS
DROPOUT DELAY:
t
PKP
t
RST
FLEXLOGIC OPERAND
Stat Trn FLT 2 OP
SETPOINT
Output Relays
Do Not Operate, Operate
FLEXLOGIC OPERAND
Stat Trn FLT 1 PKP
FLEXLOGIC OPERAND
Stat Trn FLT 2 PKP
1
22
V
IZV
Z
nn
UBbase
-
=
UBbase
nn
Z
V
IZV
OP -
-
=
1
22
OP
>=
Pickup Stage 2
SETPOINT
PICKUP STAGE 1:
OP Pickup Stage 1
FLEXLOGIC OPERAND
Motor Running
Motor Overload
OR
RUN
>=