6–90
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION
CHAPTER 6: SETPOINTS
Voltage elements
Figure 27: Voltage elements menu
Phase undervoltage
•
Undervoltage Protection
: For voltage sensitive loads, such as induction motors, a
drop in voltage will result in an increase in the drawn current, which may cause
dangerous overheating in the motor. The undervoltage protection feature can be used
S3 SETPOINT GROUP 1
PHASE TOC
PHASE IOC1
PHASE IOC2
GROUND
GND DIR
NEUTRAL TOC
NEUTRAL IOC1
NEUTRAL IOC2
NEG SEQ IOC
PHASE UV
PHASE OV
NEUTRAL OV
NEGATIVE SEQ OV
AUXILIARY UV
AUXILIARY OV
UNDER-FREQUENCY1
UNDER-FREQUENCY2
OVER-FREQUENCY1
OVER-FREQUENCY2
THERMAL MODEL
TOC
GROUND IOC1
GROUND IOC2
▼
NTRL DIR
S3 UNDERFREQUENCY 1/2
UNDRFREQ 1/2 FUNC
UNDRFREQ 1/2 PKP
UNDRFREQ 1/2 DELAY
MIN VOLTAGE
OUTPUT RELAY 3
...
OUTPUT RELAY 6
BLOCK 1
BLOCK 2
BLOCK 3
▼
S3 AUXILIARY OV
AUX OV FUNCTION
AUX OV PKP
AUX OV DELAY
OUTPUT RELAY 3
...
OUTPUT RELAY 6
BLOCK 1
BLOCK 2
BLOCK 3
▼
S3 AUXILIARY UV
AUX UV FUNCTION
PKP
DELAY
OUTPUT RELAY 3
...
OUTPUT RELAY 6
BLOCK 1
BLOCK 2
BLOCK 3
AUX UV
AUX UV CURVE
AUX UV
AUX UV MIN VOLTAGE
▼
S3 NEGATIVE SEQ OV
NEG SEQ OV FUNCTN
PKP
DELAY
OUTPUT RELAY 3
...
OUTPUT RELAY 6
BLOCK 1
BLOCK 2
BLOCK 3
NEG SEQ OV
NEG SEQ OV
▼
S3 OVERFREQUENCY 1/2
OVERFREQ 1/2 FUNCTN
OVERFREQ 1/2 PKP
OVERFREQ 1/2 DELAY
OUTPUT RELAY 3
...
OUTPUT RELAY 6
BLOCK 1
BLOCK 2
BLOCK 3
▼
S3 NEUTRAL OV
NTRL OV FUNCTION
PKP
DELAY
OUTPUT RELAY 3
...
OUTPUT RELAY 6
BLOCK 1
BLOCK 2
BLOCK 3
NTRL OV
NTRL OV
▼
S3 PHASE OV
PH OV FUNCTION
PKP
DELAY
PH OV PHASES
OUTPUT RELAY 3
...
OUTPUT RELAY 6
BLOCK 1
BLOCK 2
BLOCK 3
PH OV
PH OV
▼
S3 PHASE UV
PH UV FUNCTION
PKP
PH UV CURVE
DELAY
PH UV PHASES
PH UV MIN VOLTAGE
OUTPUT RELAY 3
...
OUTPUT RELAY 6
BLOCK 1
BLOCK 2
BLOCK 3
PH UV
PH UV
▼
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