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GE UR Series Instruction Manual Page 136

Line differential relay.
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5.4 FLEXLOGIC™
The
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 FlexEle-
ment™ can be programmed to work with all analog actual values measured by the relay. The
ting is entered in pu values using the following definitions of the base units:
Table 5–14: 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
FREQUENCY
PHASE ANGLE
POWER FACTOR
RTDs
5
SOURCE CURRENT
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 HYS-
TERESIS diagram.
The
FLEXELEMENT 1 DT UNIT
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.
5-52
setting specifies the operating threshold for the effective operating signal of the element. If set
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.
f
= 1 Hz
BASE
ϕ
= 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
P
= maximum value of V
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
setting specifies the time unit for the setting
is set to "Delta". The
FLEXELEMENT 1 DT
setting specifies the pickup delay of the element. The
L90 Line Differential Relay
FLEXELEMENT 1 PICKUP
value.
FLEXELEMENT 1 PICKUP
setting for the two transducers configured
DCMA INPUT MAX
× I
for the +IN and –IN inputs
BASE
BASE
FLEXELEMENT 1 dt
setting specifies duration of the time interval for the
FLEXELEMENT 1 COMP MODE
FLEXELEMENT 1 RST DELAY
5 SETTINGS
value. If set to "Under", the
set-
FLEXELEMENT 1 PICKUP
. This setting is applicable only if
is set to "Delta".
setting
GE Power Management

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L90

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