GE 339

6–82 339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION CHAPTER 6: SETPOINTS
Figure 6-34: Negative Sequence Overvoltage logic diagram
SETTING
NEG SEQ OV FUNCTN Disabled = 0
Latched Alarm Alarm
Trip
SETTING
BLOCK 1: Off = 0 BLOCK 2: Off = 0 BLOCK 3: Off = 0
NEG SEQ OV
ALARM PKP
S R
LATCH
896831.cdr
LOGIC OPERAND
NEG SEQ OV
ALARM OP
LOGIC OPERAND
OR
OR
AND
AND
AND
AND
OR
AND
AND
INPUTS
Emergency Restart Input Lockout Reset Input
SETTINGS
Off = 0 Lockout Reset Off = 0
Emergency Restart
S4 CONTROLS
NEG SEQ OV State: Operate
Alarm
TARGET MESSAGE
ANY ALARM OP
NEG SEQ OV
TRIP OP
ANY TRIP OP
S R
LATCH
NEG SEQ OV
Trip
State: Operate
TARGET MESSAGE
ANY ALARM PKP NEG SEQ OV
TRIP PKP
ANY TRIP PKP
AND AND
OR
S3 NEGATIVE SEQ OV
S3 NEGATIVE SEQ OV
OR
Reset Input
Reset Off = 0
AND
OR
KEYPAD RESET
ANY LATCHED ALARM OP
NEG SEQ OV State: Pickup
Alarm
TARGET MESSAGE
NEG SEQ OV State: Pickup
Trip
S3 NEGATIVE SEQ OV
Vab
NEG SEQ OV PKP:
Vbc Vca
RUN
Van Vbn
Vcn
V > PICKUP
2
DeltaWye
896835A1.cdr
SETTING
Phase Voltage Inputs (associated setpoints)
SETTING
NEG SEQ OV DELAY
t
PKP
S3 NEGATIVE SEQ OV
SETTING
OUTPUT RELAY X Do Not Operate, Operate