Negative Sequence Current - GE UR Series L90 Instruction Manual

5.6 GROUPED ELEMENTS
a) NEGATIVE SEQUENCE TIME OVERCURRENT (ANSI 51Q, IEC PTOC)
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PATH: SETTINGS GROUPED ELEMENTS
 NEG SEQ TOC1
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5
The negative-sequence time overcurrent element may be used to determine and clear unbalance in the system. The input
for calculating negative-sequence current is the fundamental phasor value.
Two methods of resetting operation are available; "Timed" and "Instantaneous" (refer to the Inverse Time Overcurrent Char-
acteristics sub-section for details on curve setup, trip times and reset operation). When the element is blocked, the time
accumulator resets according to the reset characteristic. For example, if the element reset characteristic is set to "Instanta-
neous" and the element is blocked, the time accumulator is cleared immediately.
5-216
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SETTING GROUP 1(6)
NEG SEQ TOC1
FUNCTION: Disabled
NEG SEQ TOC1 SIGNAL
MESSAGE
SOURCE: SRC 1
NEG SEQ TOC1
MESSAGE
PICKUP: 1.000 pu
NEG SEQ TOC1
MESSAGE
CURVE: IEEE Mod Inv
NEG SEQ TOC1
MESSAGE
TD MULTIPLIER: 1.00
NEG SEQ TOC1
MESSAGE
RESET: Instantaneous
NEG SEQ TOC1 BLOCK:
MESSAGE
Off
NEG SEQ TOC1
MESSAGE
TARGET: Self-reset
NEG SEQ TOC1
MESSAGE
EVENTS: Disabled
Figure 5–110: NEGATIVE SEQUENCE TOC1 SCHEME LOGIC
L90 Line Current Differential System

5.6.12 NEGATIVE SEQUENCE CURRENT

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NEGATIVE SEQUENCE CURRENT
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: 0.000 to 30.000 pu in steps of 0.001
Range: see OVERCURRENT CURVE TYPES table
Range: 0.00 to 600.00 in steps of 0.01
Range: Instantaneous, Timed
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
5 SETTINGS
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NEG SEQ TOC1(2)
GE Multilin