# Non-volatile Latches - GE L90 Instruction Manual

Line current differential system.

FLEXLOGIC
Unit
BREAKER ACC ARCING AMPS
(Brk X Acc Arc Amp A, B, and C)
BREAKER ARCING AMPS
(Brk X Arc Amp A, B, and C)
DCmA
DELTA TIME
FAULT LOCATION
FREQUENCY
FREQUENCY RATE OF CHANGE
PHASE ANGLE
POWER FACTOR
RTDs
SENSITIVE DIR POWER
(Sns Dir Power)
SOURCE CURRENT
SOURCE ENERGY
(Positive and Negative Watthours,
Positive and Negative Varhours)
SOURCE POWER
SOURCE THD & HARMONICS
SOURCE VOLTAGE
5
SYNCHROCHECK
(Max Delta Volts)
VOLTS PER HERTZ
Z
BASE
FLEXELEMENT 1 HYSTERESIS
hysteresis loop as a percentage of the pickup value as shown in the FlexElement Direction, Pickup, and Hysteresis diagram.
FLEXELEMENT 1 dt UNIT
FLEXELEMENT 1 COMP MODE
— Specifies duration of the time interval for the rate of change mode of operation. This setting is
FLEXELEMENT 1 dt
applicable only if
FLEXELEMENT 1 COMP MODE
FLEXELEMENT 1 PKP DELAY
FLEXELEMENT 1 RST DELAY

## 5.6.8 Non-volatile latches

SETTINGS  FLEXLOGIC  NON-VOLATILE LATCHES  LATCH 1(16)
 LATCH 1
5-214
Description
2
BASE = 2000 kA
× cycle
2
BASE = 1 kA
× cycle
BASE = maximum value of the DCMA INPUT MAX setting for the two transducers configured
under the +IN and –IN inputs
BASE = 1 µs
BASE = Line Length as specified in Fault Report
f
= 1 Hz
BASE
df/dt
= 1 Hz/s
BASE
ϕ
= 360 degrees (see the UR angle referencing convention)
BASE
PF
= 1.00
BASE
BASE = 100°C
P
= maximum value of 3 × V
BAS
E
for the sensitive power directional element(s).
I
= maximum nominal primary RMS value of the +IN and –IN inputs
BASE
E
= 10000 MWh or MVAh, respectively
BAS
E
P
= maximum value of V
BASE
BASE = 1%
V
= maximum nominal primary RMS value of the +IN and –IN inputs
BASE
V
= maximum primary RMS value of all the sources related to the +IN and –IN inputs
BASE
BASE = 1.00 pu
Z
= PhaseVTSecondary / PhaseCTSecondary, where PhaseVTSecondary and
BASE
PhaseCTSecondary are the secondary nominal voltage and the secondary nominal current of the
distance source. In case multiple CT inputs are summed as one source current and mapped as the
distance source, use the PhaseCTSecondary value from the CT with the highest primary nominal
current.
Distance source is specified in setting under SETTINGS  GROUPED ELEMENTS  SETTING
GROUP 1(6)  DISTANCE.
PhaseVTSecondary and PhaseCTSecondary are specified in setting under SETTINGS  SYSTEM
SETUP  AC INPUTS.
— This setting defines the pickup–dropout relation of the element by specifying the width of the
— Specifies the time unit for the setting
is set to "Delta."
is set to "Delta."
— Specifies the pickup delay of the element.
— Specifies the reset delay of the element.
LATCH 1
FUNCTION: Disabled
LATCH 1 ID:
NV Latch 1
× I
for the +IN and –IN inputs of the sources configured
BASE
BASE
× I
for the +IN and –IN inputs
BASE
BASE
. This setting is applicable only if
FLEXELEMENT 1 dt
Range: Disabled, Enabled
Range: up to 20 alphanumeric characters
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS