GE Multilin F650 Digital Bay Controller 5-63
5 SETPOINTS 5.4 PROTECTION ELEMENTS
5
5.4.7 NEGATIVE SEQUENCE CURRENT
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
The snapshot event setpoint enables or disables the snapshot event generation for this unit.
SETPOINT > PROTECTION ELEMENTS > NEGATIVE SEQUENCE CURRENT > NEGATIVE SEQUENCE TOC >
NEGATIVE SEQUENCE TOC 1> NEGATIVE SEQUENCE TOC 2 > NEGATIVE SEQUENCE TOC 3
SETPOINT DESCRIPTION NAME DEFAULT VALUE STEP RANGE
Function permission Function DISABLED N/A [DISABLED – ENABLED]
Pickup level Pickup Level 1.00 0.01 A [0.05 : 160.00]
Curve shape Curve IEEE Ext Inv N/A [See list of curves]
Time Dial TD Multiplier 1.00 0.01 s [0.00 : 900.00]
Reset type Reset INSTANTANEOUS N/A [INSTANTANEOUS – LINEAR]
Snapshot Event generation Snapshot Events ENABLED N/A [DISABLED – ENABLED]
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