GE L30 User Manual

GE Multilin L30 Line Current Differential System 5-179
5 SETTINGS 5.6 GROUPED ELEMENTS
5
Two methods of resetting operation are available: “Timed” and “Instantaneous” (see the Inverse TOC 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 characteristic is set to “Instantaneous” and the
element is blocked, the time accumulator will be cleared immediately.
Figure 5–69: NEUTRAL TIME OVERCURRENT 1 SCHEME LOGIC
c) NEUTRAL INSTANTANEOUS OVERCURRENT (ANSI 50N, IEC PIOC)
PATH: SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  NEUTRAL CURRENT  NEUTRAL IOC1(4)
The neutral instantaneous overcurrent element may be used as an instantaneous function with no intentional delay or as a
definite time function. The element essentially responds to the magnitude of a neutral current fundamental frequency pha-
sor calculated from the phase currents. A positive-sequence restraint is applied for better performance. A small portion
(6.25%) of the positive-sequence current magnitude is subtracted from the zero-sequence current magnitude when forming
the operating quantity of the element as follows:
(EQ 5.18)
The positive-sequence restraint allows for more sensitive settings by counterbalancing spurious zero-sequence currents
resulting from
 NEUTRAL IOC1

NEUTRAL IOC1
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
NEUTRAL IOC1 SIGNAL
SOURCE: SRC 1
Range: SRC 1, SRC 2
MESSAGE
NEUTRAL IOC1
PICKUP: 1.000 pu
Range: 0.000 to 30.000 pu in steps of 0.001
MESSAGE
NEUTRAL IOC1 PICKUP
DELAY: 0.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
NEUTRAL IOC1 RESET
DELAY: 0.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
NEUTRAL IOC1 BLOCK:
Off
Range: FlexLogic operand
MESSAGE
NEUTRAL IOC1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled
MESSAGE
NEUTRAL IOC1
EVENTS: Disabled
Range: Disabled, Enabled
SETTING
NEUTRAL TOC1
FUNCTION:
Enabled = 1
SETTING
NEUTRAL TOC1
SOURCE:
IN
NEUTRAL TOC1
BLOCK:
Off = 0
NEUTRAL TOC1
CURVE:
NEUTRAL TOC1
TD MULTIPLIER:
NEUTRAL TOC 1
RESET:
SETTINGS
SETTING
IN PICKUP
I
t
NEUTRAL TOC1
PICKUP:
RUN
827034A4.VSD
FLEXLOGIC OPERANDS
NEUTRAL TOC1 DPO
NEUTRAL TOC1 OP
NEUTRAL TOC1
INPUT:
AND
NEUTRAL TOC1 PKP
I
op
3I_0Kx I_1–()×= where K 116⁄=

GE L30 Specifications

General

Brand	GE
Model	L30
Category	Relays
Language	English