GE UR Series L90 Instruction Manual page 287

5 SETTINGS
The setting specifies the operating threshold for the effective operating signal of the element. If set
FLEXELEMENT 1 PICKUP
to "Over", the element picks up when the operating signal exceeds the
element picks up when the operating signal falls below the
The
FLEXELEMENT 1 HYSTERESIS
and the pickup threshold can be negative facilitating applications such as reverse power alarm protection. The FlexElement
can be programmed to work with all analog actual values measured by the relay. The
entered in per-unit values using the following definitions of the base units:
Table 5–15: FLEXELEMENT BASE UNITS
87L SIGNALS
(Local IA Mag, IB, and IC)
(Diff Curr IA Mag, IB, and IC)
(Terminal 1 IA Mag, IB, and IC)
(Terminal 2 IA Mag, IB and IC)
87L SIGNALS
(Op Square Curr IA, IB, and IC)
(Rest Square Curr IA, IB, and IC)
BREAKER ARCING AMPS
(Brk X Arc Amp A, B, and C)
dcmA
DELTA TIME
FREQUENCY
PHASE ANGLE
POWER FACTOR
RTDs
SOURCE CURRENT
SOURCE ENERGY
(Positive and Negative Watthours,
Positive and Negative Varhours)
SOURCE POWER
SOURCE VOLTAGE
SYNCHROCHECK
(Max Delta Volts)
The
FLEXELEMENT 1 HYSTERESIS
hysteresis loop as a percentage of the pickup value as shown in the FlexElement direction, pickup, and hysteresis diagram.
The setting specifies the time unit for the setting
FLEXELEMENT 1 DT UNIT
is set to "Delta". The
FLEXELEMENT 1 COMP MODE
rate of change mode of operation. This setting is applicable only if
This
FLEXELEMENT 1 PKP DELAY
specifies the reset delay of the element.
GE Multilin
FLEXELEMENT 1 PICKUP
setting controls the element dropout. It should be noticed that both the operating signal
I = maximum primary RMS value of the +IN and –IN inputs
BASE
(CT primary for source currents, and 87L source primary current for line differential currents)
BASE = Squared CT secondary of the 87L source
2
 cycle
BASE = 2000 kA
BASE = maximum value of the
under the +IN and –IN inputs.
BASE = 1 µs
f = 1 Hz
BASE

= 360 degrees (see the UR angle referencing convention)
BASE
PF = 1.00
BASE
BASE = 100°C
I = maximum nominal primary RMS value of the +IN and –IN inputs
BASE
E = 10000 MWh or MVAh, respectively
BASE
P = maximum value of V
BASE BASE
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
setting defines the pickup–dropout relation of the element by specifying the width of the
FLEXELEMENT 1 DT
setting specifies the pickup delay of the element. The
L90 Line Current Differential System
FLEXELEMENT 1 PICKUP
value.
FLEXELEMENT 1 PICKUP
DCMA INPUT MAX setting for the two transducers configured
 I
for the +IN and –IN inputs
BASE
. This setting is applicable only if
FLEXELEMENT 1 dt
setting specifies duration of the time interval for the
FLEXELEMENT 1 COMP MODE
FLEXELEMENT 1 RST DELAY
5.5 FLEXLOGIC
value. If set to "Under", the
setting is
is set to "Delta".
setting
5-149
5