Negative Sequence Current - GE L30 Instruction Manual

5 SETTINGS
SETTING
GROUND IOC1
FUNCTION:
Enabled = 1
SETTING
GROUND IOC1
SOURCE:
IG
SETTING
GROUND IOC1
BLOCK:
Off = 0
a) NEGATIVE SEQUENCE TIME OVERCURRENT (ANSI 51Q, IEC PTOC)
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PATH: SETTINGS GROUPED ELEMENTS
 NEG SEQ TOC1
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MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
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.
GE Multilin
SETTINGS
GROUND IOC1 PICKUP
SETTING
DELAY:
GROUND IOC1
GROUND IOC1 RESET
PICKUP:
DELAY:
AND RUN
t
PKP
IG PICKUP
Figure 5–74: GROUND IOC1 SCHEME LOGIC
 
SETTING GROUP 1(6)
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
L30 Line Current Differential System
5.6 GROUPED ELEMENTS
t
RST

5.6.7 NEGATIVE SEQUENCE CURRENT

NEGATIVE SEQUENCE CURRENT
Range: Disabled, Enabled
Range: SRC 1, SRC 2
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
GROUND IOC1 PKP
GROUND IOIC DPO
GROUND IOC1 OP
827037A5.VSD

NEG SEQ TOC1(2)
5
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