5–76 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
S4 ELEMENTS CHAPTER 5: SETPOINTS
5.6.9 Negative Sequence Overcurrent
5.6.9.1 Main Menu
PATH: SETPOINTS S4 ELEMENTS NEG SEQ OC
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.
5.6.9.2 Negative Sequence Time Overcurrent
PATH: SETPOINTS S4 ELEMENTS NEG SEQ OC W1(3) NEG SEQ TIME OC
• 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
See page 5–76
MESSAGE
W2 NEG SEQ []
TIME OC
See page 5–76
MESSAGE
W3 NEG SEQ []
TIME OC
See page 5–76
MESSAGE
W1 NEG SEQ []
INST OC
See page 5–77
MESSAGE
W2 NEG SEQ []
INST OC
See page 5–77
MESSAGE
W3 NEG SEQ []
INST OC
See page 5–77
W1 NEG SEQ []
TIME OC
W1 NEG SEQ TIME OC
FUNCTION: Enabled
Range: Enabled, Disabled
MESSAGE
W1 NEG SEQ TIME OC
RLYS (1-8): --------
Range: 1 to 8
MESSAGE
W1 NEG SEQ TIME OC
TARGET: Latched
Range: Self-Reset, Latched, None
MESSAGE
W1 NEG SEQ TIME OC
PICKUP: 0.25 x CT
Range: 0.05 to 20.00 x CT in steps of
0.01
MESSAGE
W1 NEG SEQ TIME OC
SHAPE: Ext Inverse
Range: see description below
MESSAGE
W1 NEG SEQ TIME OC
MULTIPLIER: 1.00
Range: 0.00 to 100.00 in steps of 0.01
MESSAGE
W1 NEG SEQ TIME OC
RESET: Linear
Range: Instantaneous, Linear
MESSAGE
W1 NEG SEQ TIME OC
BLOCK: Disabled
Range: Logc Inpt 1 to 16, Virt Inpt 1 to
16, Output Rly 2 to 8, SelfTest
Rly, Vir Outpt 1 to 5, Disabled
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