GE L30 User Manual

GE Multilin L30 Line Current Differential System 5-187
5 SETTINGS 5.6 GROUPED ELEMENTS
5
Figure 5–74: GROUND IOC1 SCHEME LOGIC
5.6.7 NEGATIVE SEQUENCE CURRENT
a) NEGATIVE SEQUENCE TIME OVERCURRENT (ANSI 51Q, IEC PTOC)
PATH: SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  NEGATIVE SEQUENCE CURRENT  NEG SEQ TOC1(2)
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.
 NEG SEQ TOC1

NEG SEQ TOC1
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
NEG SEQ TOC1 SIGNAL
SOURCE: SRC 1
Range: SRC 1, SRC 2
MESSAGE
NEG SEQ TOC1
PICKUP: 1.000 pu
Range: 0.000 to 30.000 pu in steps of 0.001
MESSAGE
NEG SEQ TOC1
CURVE: IEEE Mod Inv
Range: see OVERCURRENT CURVE TYPES table
MESSAGE
NEG SEQ TOC1
TD MULTIPLIER: 1.00
Range: 0.00 to 600.00 in steps of 0.01
MESSAGE
NEG SEQ TOC1
RESET: Instantaneous
Range: Instantaneous, Timed
MESSAGE
NEG SEQ TOC1 BLOCK:
Off
Range: FlexLogic operand
MESSAGE
NEG SEQ TOC1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled
MESSAGE
NEG SEQ TOC1
EVENTS: Disabled
Range: Disabled, Enabled
SETTING
GROUND IOC1
FUNCTION:
Enabled = 1
SETTING
GROUND IOC1
SOURCE:
IG
GROUND IOC1
BLOCK:
Off = 0
FLEXLOGIC OPERANDS
GROUND IOIC DPO
GROUND IOC1 OP
SETTING
SETTING
IG PICKUP
GROUND IOC1
PICKUP:
RUN
GROUND IOC1 PICKUP
DELAY:
SETTINGS
GROUND IOC1 RESET
DELAY:
t
PKP
t
RST
827037A5.VSD
AND
GROUND IOC1 PKP

GE L30 Specifications

General

Brand	GE
Model	L30
Category	Relays
Language	English