GE Multilin g60, Instruction Manual

Page: 317 / 780

GE Multilin G60 Generator Protection System 5-157
5 SETTINGS 5.5 FLEXLOGIC
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 FlexElement
can be programmed to work with all analog actual values measured by the relay. The
FLEXELEMENT 1 PICKUP
setting 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 diagram.
Table 5–18: FLEXELEMENT BASE UNITS
DCmA BASE = maximum value of the
DCMA INPUT MAX
setting for the two transducers configured
under the +IN and –IN inputs.
DELTA TIME BASE = 1 µs
FIELD CURRENT I
BASE
= maximum value setting defined for the specific transducer input configured
FIELD GROUND CURRENT I
BASE
= 5 mA
FIELD GROUND FAULT
LOCATION
BASE = 100%
FIELD GROUND INJECTED
VOLTAGE
V
BASE
= 15 V
FIELD GROUND RESISTANCE R
BASE
= 250 K Ω
FIELD VOLTAGE V
BASE
= 500 V
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 GROUND RESISTANCE R
BASE
= 10 K Ω
STATOR GROUND SUB-
HARMONIC VOLTAGE
V
BASE
= nominal secondary voltage of auxiliary VT for the stator ground source
STATOR GROUND SUB-
HARMONIC CURRENT
I
BASE
= ground CT primary current of 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