GE G60 UR Series, Instruction Manual

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5-122 G60 Generator Protection System GE Multilin
5.5 FLEXLOGIC™ 5 SETTINGS
5
The
FLEXELEMENT 1 PICKUP
setting specifies the operating threshold for the effective operating signal of the element. If set
to “Over”, the element picks up when the operating signal exceeds the
FLEXELEMENT 1 PICKUP
value. If set to “Under”, the
element picks up when the operating signal falls below the
FLEXELEMENT 1 PICKUP
value.
The
FLEXELEMENT 1 HYSTERESIS
setting controls the element dropout. It should be noticed that both the operating signal
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
FLEXELEMENT 1 PICKUP
set-
ting is entered in per-unit values using the following definitions of the base units:
The
FLEXELEMENT 1 HYSTERESIS
setting defines the pickup–dropout relation of the element by specifying the width of the
hysteresis loop as a percentage of the pickup value as shown in the FlexElement™ direction, pickup, and hysteresis dia-
gram.
The
FLEXELEMENT 1 DT UNIT
setting specifies the time unit for the setting
FLEXELEMENT 1 dt
. This setting is applicable only if
FLEXELEMENT 1 COMP MODE
is set to “Delta”. The
FLEXELEMENT 1 DT
setting specifies duration of the time interval for the
rate of change mode of operation. This setting is applicable only if
FLEXELEMENT 1 COMP MODE
is set to “Delta”.
This
FLEXELEMENT 1 PKP DELAY
setting specifies the pickup delay of the element. The
FLEXELEMENT 1 RST DELAY
setting
specifies the reset delay of the element.
Table 5–12: FLEXELEMENT™ BASE UNITS
dcmA BASE = maximum value of the
DCMA INPUT MAX
setting for the two transducers configured
under the +IN and –IN inputs.
FREQUENCY f
BASE
= 1 Hz
FREQUENCY RATE OF CHANGE df/dt
BASE
= 1 Hz/s
PHASE ANGLE
ϕ
BASE
= 360 degrees (see the UR angle referencing convention)
POWER FACTOR PF
BASE
= 1.00
RTDs BASE = 100°C
SENSITIVE DIR POWER
(Sns Dir Power) P
BASE
= maximum value of 3
×
V
BASE
×
I
BASE
for the +IN and –IN inputs of the sources
configured for the sensitive power directional element(s).
SOURCE CURRENT I
BASE
= maximum nominal primary RMS value of the +IN and –IN inputs
SOURCE ENERGY
(Positive and Negative Watthours,
Positive and Negative Varhours) E
BASE
= 10000 MWh or MVAh, respectively
SOURCE POWER P
BASE
= maximum value of V
BASE
×
I
BASE
for the +IN and –IN inputs
SOURCE VOLTAGE V
BASE
= maximum nominal primary RMS value of the +IN and –IN inputs
STATOR DIFFERENTIAL
CURRENT
(Stator Diff Iar, Ibr, and Icr) I
BASE
= maximum primary RMS value of the +IN and –IN inputs
(CT primary for source currents, and bus reference primary current for bus differential currents)
STATOR GROUND 3RD
HARMONIC VOLTAGES
(Stator Gnd Vn/V0 3rd) V
BASE
= Primary auxiliary voltage of the
STATOR GROUND SOURCE
STATOR RESTRAINING
CURRENT
(Stator Diff Iad, Ibd, and Icd) I
BASE
= maximum primary RMS value of the +IN and –IN inputs
(CT primary for source currents, and bus reference primary current for bus differential currents)
SYNCHROCHECK
(Max Delta Volts) V
BASE
= maximum primary RMS value of all the sources related to the +IN and –IN inputs
VOLTS PER HERTZ BASE = 1.00 pu