Negative Sequence Current - GE UR Series Instruction Manual

5 SETTINGS
a) NEGATIVE SEQUENCE TOC1 / TOC2 (NEGATIVE SEQUENCE TIME OVERCURRENT: ANSI 51_2)
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PATH: SETTINGS GROUPED ELEMENTS
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NEG SEQ TOC1
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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 OVERCUR-
RENT CURVE CHARACTERISTICS section for details on curve setup, trip times and reset operation). When the element
is blocked, the time accumulator will reset according to the reset characteristic. For example, if the element reset character-
istic is set to "Instantaneous" and the element is blocked, the time accumulator will be cleared immediately.
SETTING
NEG SEQ TOC1 FUNCTION:
Disabled=0
Enabled=1
SETTING
NEG SEQ TOC1 BLOCK:
Off=0
SETTING
NEG SEQ TOC1 SOURCE:
Neg Seq
Once picked up, the NEG SEQ TOCx PKP output operand remains picked up until the thermal memory of
the element resets completely. The PKP operand will not reset immediately after the operating current
NOTE
drops below the pickup threshold unless
GE Power Management
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SETTING GROUP 1(8)
NEG SEQ TOC1
FUNCTION: Disabled
NEG SEQ TOC1 SIGNAL
SOURCE: SRC 1
NEG SEQ TOC1
PICKUP: 1.000 pu
NEG SEQ TOC1
CURVE: IEEE Mod Inv
NEG SEQ TOC1
TD MULTIPLIER: 1.00
NEG SEQ TOC1
RESET: Instantaneous
NEG SEQ TOC1 BLOCK:
Off
NEG SEQ TOC1
TARGET: Self-reset
NEG SEQ TOC1
EVENTS: Disabled
SETTING
NEG SEQ TOC1 INPUT:
NEG SEQ TOC1 PICKUP:
NEG SEQ TOC1 CURVE:
NEG SEQ TOC1 TD MULTIPLIER:
NEG SEQ TOC1 RESET:
RUN
AND
Figure 5–48: NEGATIVE SEQUENCE TOC1 SCHEME LOGIC
NEG SEQ TOCx RESET
L90 Line Differential Relay

5.5.15 NEGATIVE SEQUENCE CURRENT

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NEGATIVE SEQUENCE CURRENT
Range: Disabled, Enabled
Range: SRC 1, SRC 2,..., SRC 6
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
FLEXLOGIC OPERANDS
NEG SEQ TOC1 PKP
<
NEG SEQ PICKUP
NEG SEQ TOC1 DPO
NEG SEQ TOC1 OP
t
is set to "Instantaneous".
5.5 GROUPED ELEMENTS
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NEG SEQ TOC1
827057A4.CDR
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