Negative Sequence Current; Negative Sequence Overcurrent Unit (46P) - GE Multilin F650 Instruction Manual

5 SETPOINTS
The F650 Negative sequence menu incorporates the Negative sequence time overcurrent (46P) unit:

5.4.7.1 NEGATIVE SEQUENCE OVERCURRENT UNIT (46P)

46P unit is an overcurrent protection element that uses the fundamental phasor of the negative sequence current as input
magnitude, calculated from the phase currents. This unit can be used for detecting load unbalance in the system, and for
open phase conditions (fallen or broken conductor). The trip time can be selected as an inverse curve or instantaneous.
The unit reset can also be selected as instantaneous or linear.
Table 5–58: 46 UNIT SETPOINTS
SETPOINT > PROTECTION ELEMENTS > NEGATIVE SEQUENCE CURRENT > NEGATIVE SEQUENCE TOC >
NEGATIVE SEQUENCE TOC 1> NEGATIVE SEQUENCE TOC 2 > NEGATIVE SEQUENCE TOC 3
SETPOINT DESCRIPTION
Function permission
Pickup level
Curve shape
Time Dial
Reset type
Snapshot Event generation
The snapshot event setpoint enables or disables the snapshot event generation for this unit.
GE Multilin
NAME DEFAULT VALUE
Function DISABLED
Pickup Level 1.00
Curve IEEE Ext Inv
TD Multiplier 1.00
Reset INSTANTANEOUS
Snapshot Events ENABLED
F650 Digital Bay Controller
5.4 PROTECTION ELEMENTS

5.4.7 NEGATIVE SEQUENCE CURRENT

STEP RANGE
N/A [DISABLED – ENABLED]
0.01 A [0.05 : 160.00]
N/A [See list of curves]
0.01 s [0.00 : 900.00]
N/A [INSTANTANEOUS – LINEAR]
N/A [DISABLED – ENABLED]
5
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