CHAPTER 6: SETPOINTS
S3 PROTECTION
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
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Setpoint group 1(2)
Figure 15: Protection setpoint group 1(2) menu - 1 of 2
S3 THERMAL MODEL
THERMAL MDL FUNC
THERMAL MDL PKP
THERMAL MDL ALARM
HEAT TIME CONSTANT
COOL TIME CONSTANT
OUTPUT RELAY 3
...
OUTPUT RELAY 6
BLOCK 1
BLOCK 2
BLOCK 3
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S3 SETPOINT GROUP 1
XFMR PCNT DIFF
RESTD GND FAULT1
GROUND TOC1
GROUND IOC1
GROUND IOC2
NEUTRAL TOC1
NEUTRAL IOC1
NEUTRAL IOC2
NEG SEQ TOC1
XFMR INST DIFF
RESTD GND FAULT2
THERMAL MODEL
PHASE TOC1
PHASE TOC2
PHASE IOC1
PHASE IOC2
GROUND TOC2
NEUTRAL TOC2
NEG SEQ TOC2
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897798. cdr
S3 RESTD GND FAULT
RGF FUNCTION
CT INPUTS
RGF PICKUP
RGF SLOPE
RGF DELAY
GND CURRENT SPVSN
OUTPUT RELAY 3
...
OUTPUT RELAY 6
BLOCK 1
BLOCK 2
BLOCK 3
GND SUPV LEVEL
▼
S3 XFMR INST DIFF
INST DIFF FUNCTION
INST DIFF PICKUP
OUTPUT RELAY 3
...
OUTPUT RELAY 6
BLOCK 1
BLOCK 2
BLOCK 3
▼
S3 XFMR PERCENT DIFF
PCNT DIFF FUNCTION
MINIMUM PICKUP
SLOPE 1
BREAK 1
BREAK 2
SLOPE 2
INRUSH INHBT FUNCT
OUTPUT RELAY 3
...
OUTPUT RELAY 6
BLOCK 1
BLOCK 2
BLOCK 3
INRUSH INHBT LEVEL
INRUSH INHBT MODE
OVEREXCIT INHIBIT
OVEREX INHT LEVEL
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