BE1-951 Input
and
Output Functions
3-3
Equation 8
VARs
3
-
3 × V
x
I
x
sin(
-
x
)
where: x
A, B, or C based on sensing type and
3
x
5
V
x
5
I
x
For AB, BC, or CA VT connection, with ABC phase sequence
Equation 9
WATTs
3
-
3 × V
xy
I
x
cos(
-
30
)
Equation 10
VARs
3
-
3 × V
xy
I
x
sin(
-
30
)
where: x and y
A, B, or C based on sensing type and
3
5
V
xy
5
I
x
For AB, BC, or CA VT connection, with ACB phase sequence
Equation 11
WATTs
3
-
3 × V
xy
I
x
cos(
-
30
)
Equation 12
VARs
3
-
3 × V
xy
I
x
sin(
-
30
)
where: x and y
A, B, or C based on sensing type and
3
5
V
xy
5
I
x
Measurement Functions Setup
Current Input Circuit Settings. The BE1-951 requires setting information on the CT ratio. These settings are
used by the metering and fault reporting functions to display measured quantities in primary units.
CT ratio settings can be entered at the HMI using screens 6.3.1 and 6.3.2 or through the communication
ports using the SG-CT (setting general-CT input circuit) command.
Voltage Input Circuit Settings. The BE1-951 requires setting information about the VT ratio, the VT
connections, and the operating modes for the 27/59 and 51/27R functions. These settings are used by the
metering and fault reporting functions to display measured quantities in primary units. The voltage input
circuit settings also determine which power measurement calculations are used. Most of these connections
such as 3W, 4W, AN, or AB are self explanatory.
The auxiliary voltage input (VX) connection can be set for any voltage combination VA, VB, VC, VAB, VBC,
or VCA. When set for one of these voltages, the sync-check function can automatically compensate for the
phase angle difference relative to the reference voltage measured at the three-phase voltage inputs.
Alternately, the VX input connection can be set to GR. This setting is used when the VX input is connected
to a source of ground unbalance voltage or residual voltage such as a generator grounding resistor, broken
delta VT connection, or capacitor bank star point.
VT settings can be entered at screen 6.3.3 through 6.3.6 or through a communication port using the SG-VTP
and SG-VTX (setting general-VT input circuit) command.
Nominal frequency is set for 50 hertz or 60 hertz power systems at screen 6.3.8 of the HMI or through the
communication ports using the SG-FREQ (settings general-frequency) command.
Nominal voltage and current rating settings are used by the 60FL function, the 46 timing curve, and the DNP
3.0 protocol analog event reporting functions. These settings are viewable and selectable through screen
6.3.7
Table 3-1 lists the measurement functions settings.
