BECKWITH ELECTRIC M-3425A, Instruction Book

Page: 159 / 482

4–28
M‑3425A Instruction Book
When Input Activated Profiles is disabled, the Active Profile
can be selected using HMI or remote communication. When
enabled, the Active Profile is selected by the state of Input 5
and 6 (see Table 4-4).
This screen sets the active setpoint profile.
This screen initiates a copy of the Active Profile to any one
of the other profiles.
The secondary VT voltage when primary voltage is equal to
the rated generator
voltage. V
nominal
=(
V
gen
rated I VT ratio)
for L-L VT connections. V
nominal
=(
V
gen rated I (
S
3 VT ratio))
for L-G VT connections.
The secondary CT current of the phase CT’s with rated
generator current.
I
nom
= (VA I (Vgen rated(
S
3) )(CT ratio) )
Indicates VT connection. (See Figure 4-20, Three-Line
Connection Diagram.) When line-ground voltages are used,
functions 24, 27, and 59 may operate for line-ground faults.
If this is not desired, the line-gnd-to-line-line selection
should be used to prevent operation of these functions for
line-ground faults. When line-gnd-to-line-line is selected, the
relay internally calculates line-line voltages from line-ground
voltages for all voltage-sensitive functions. This line-gnd-to-
line-line selection should be used only for a VT line-to-ground
nominal secondary voltage of 69V (not for 120 V). For this
selection, the nominal voltage setting entered should be
line-line nominal voltage, which is
S
3 times line-ground
nominal voltage, and voltage function pickup setpoints
calculation should be made using line-to-line voltage.
INPUT ACTIVATED PROFILES
disable enable
ACTIVE SETPOINT PROFILE
COPY ACTIVE PROFILE
To_Profile_1

NOMINAL VOLTAGE
Volts
NOMINAL CURRENT
Amps
VT CONFIGURATION
line-line line-ground 
 line-gnd_to_line-line
4.2 Setup System
System setup data is required for proper operation
of the relay.
The Setup System consists of defining common
information like CT and VT ratios, nominal voltage
rating, nominal current rating and which profile is
the Active Profile, etc. Values are entered similar
to other setpoints. Configuration information is
common to all profiles, and should be entered
before setpoint and time settings.

NOTE: Table 4-3 assumes ACTIVE INPUT STATE
set to default setting (close circuit = TRUE).
Input 5 Input 6 Selection
Open Open Profile 1
Closed Open Profile 2
Open Closed Profile 3
Closed Closed Profile 4
Table 4-3 Input Activated Profile Logic