GE 745 Instruction Manual page 172

S4 ELEMENTS
5.6.9 Negative Sequence Overcurrent
5.6.9.1 Main Menu

NEG SEQ OC
5.6.9.2 Negative Sequence Time Overcurrent

W1 NEG SEQ
TIME OC
5–76
PATH: SETPOINTS S4 ELEMENTS
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This section contains the settings to configure the negative sequence overcurrent
elements. Included are negative sequence time overcurrents for each winding, and
negative sequence instantaneous overcurrents for each winding.
PATH: SETPOINTS S4 ELEMENTS
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• W1 (3) NEG SEQ TIME OC PICKUP: Enter the level of negative sequence current (in
units of relay nominal current) above which the winding 1(3) negative sequence time
overcurrent element will pickup and start timing.
• W1 (3) NEG SEQ TIME OC SHAPE: Select the time overcurrent curve shape to be used
for the winding 1(3) negative sequence time overcurrent element. Refer to Time
Overcurrent Curves on page 5–59 for a description of the time overcurrent curve
shapes.
NEG SEQ OC

 
W1 NEG SEQ [ ]
TIME OC
 
W2 NEG SEQ [ ]
TIME OC
 
W3 NEG SEQ [ ]
TIME OC


W1 NEG SEQ [ ]
INST OC

 W2 NEG SEQ [ ]
INST OC
 
W3 NEG SEQ [ ]
INST OC
NEG SEQ OC
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W1 NEG SEQ TIME OC
FUNCTION: Enabled
W1 NEG SEQ TIME OC
RLYS (1-8): --------
W1 NEG SEQ TIME OC
TARGET: Latched
W1 NEG SEQ TIME OC
PICKUP: 0.25 x CT
W1 NEG SEQ TIME OC
SHAPE: Ext Inverse
W1 NEG SEQ TIME OC
MULTIPLIER: 1.00
W1 NEG SEQ TIME OC
RESET: Linear
W1 NEG SEQ TIME OC
BLOCK: Disabled
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
See page 5–76
See page 5–76
See page 5–76
See page 5–77
See page 5–77
See page 5–77
W1(3) NEG SEQ TIME OC

Range: Enabled, Disabled
Range: 1 to 8
Range: Self-Reset, Latched, None
Range: 0.05 to 20.00 x CT in steps of
0.01
Range: see description below
Range: 0.00 to 100.00 in steps of 0.01
Range: Instantaneous, Linear
Range: Logc Inpt 1 to 16, Virt Inpt 1 to
16, Output Rly 2 to 8, SelfTest
Rly, Vir Outpt 1 to 5, Disabled