SEL-701-1 Monitor
Date Code 20011009
Settings Calculation
General Data
3.6
Voltage Transformer (VT) Configuration Settings (Monitor Models
0701101X & 0701111X)
These settings configure the optional monitor voltage inputs to correctly measure
and scale the voltage signals. Set the Phase VT Ratio (PTR) setting equal to the VT
ratio to 1.
EXAMPLE 3.2
Phase VT Ratio Setting Calculations
Consider a 4160 V motor application where the phase-to-phase
connected voltage transformer ratios are 4160:118.
Set PTR = 4160/118 = 35.25 = 35
When phase-to-phase potentials are connected to the monitor, set DELTA_Y
equal to D. When phase-to-neutral potentials are connected to the monitor, set
DELTA_Y equal to Y.
In applications where only a single voltage is available, set SINGLEV equal to Y.
As shown in
Figure 2.8 on page 2.9 in Section 2: Installation
page 2.9 in Section 2: Installation
, the single voltage must be connected to the A-phase
input, but it may be an A-N or an A-B voltage. Be sure to set DELTA_Y equal to Y for
an A-N input or DELTA_Y equal to D for an A-B input voltage.
When you set SINGLEV equal to Y, the monitor performance changes in the
following ways:
Voltage Elements.
When you use one phase-to-phase voltage, the
monitor overvoltage and undervoltage elements use the applied
phase-to-phase voltage only. When you use one phase-to-neutral
voltage, the monitor voltage elements use the applied phase-to-
neutral voltage only.
Power Elements.
When you use one voltage, the monitor assumes
that the system voltages are balanced in both magnitude and phase
angle to calculate apparent, real, and reactive power and the power
factor.
Metering.
When you use one phase-to-phase voltage, the monitor
displays that magnitude and phase angle. When you use one phase-
to-neutral voltage, the monitor multiplies that magnitude by the
Table 3.4
VT Configuration Settings
Setting Prompt
Setting Range
Setting Name =
Factory Default
Phase (VA, VB, VC) VT Ratio
1–6000 to 1
PTR = 100
Phase VT Connection
D, Y
DELTA_Y = Y
Single Voltage Input
Y, N
SINGLEV = N
Содержание SEL-701-1
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