9365200990 Rev F
BE1-CDS240 Metering
5-1
SECTION 5
METERING
INTRODUCTION
The BE1-CDS240 Current Differential System measures the voltage and current inputs, displays those
values in real time, records those values every one-half second, and calculates other quantities from the
measured inputs.
METERING FUNCTIONS
The CDS-240 metering functions include voltage, current, frequency, power factor, apparent power,
reactive power, and true power. Metered values are viewed through any communication port using serial
commands, using the BESTCOMS
Metering
screen, or at the front panel HMI. Metering functions are
summarized in the following paragraphs and in Table 5-1. For assistance with navigating the HMI
metering screens, refer to Section 10,
Human-Machine Interface
. For more information on power, VA, and
var calculations, refer to Section 3,
Input and Output Functions, Power System Inputs, Power
Measurement
. Energy measurement is covered in Section 6,
Reporting and Alarm Functions
.
Auto Ranging
The BE1-CDS240 automatically scales metered values. Table 5-1 illustrates the ranges for each value
metered.
Table 5-1. Auto Ranging Scales for Metered Values
Unit Display Ranges
Metered Value
Whole Units
Kilo Units
Mega Units
Giga Units
Current
0 A to 9,999 A
10 kA to 9,999 kA
10 MA
N/A
Voltage
0 V to 9,999 V
10 kV to 9,999 kV
N/A
N/A
Apparent Power
N/A
0 kVA to 000 kVA
1 MVA to 999 MVA
1 GVA to 1000 GVA
Reactive Power
N/A
0 kvar to 999 kvar
1 Mvar to 999 Mvar
1 Gvar to 1000 Gvar
True Power
N/A
0 kW to 999 kW
1 MW to 999 MW
1 GW to 1000 GW
Frequency
10 to 75 Hz
N/A
N/A
N/A
BESTCOMS Metering Screen
Metered values are viewed through the BESTCOMS
Metering
screen (see Figure 5-1). To open the
Metering
screen, select
Metering
from the
Reports
pull-down menu. To begin viewing metered values,
select the
Start Polling
button in the bottom right of the screen.
Alternately, metering can be performed using the ASCII command interface or HMI using screens
\METER\VOLT, \METER\CRNT, \METER\DIFF, \METER\POWER, and \METER\FREQ.
Refer to Table 5-2 for a list of ASCII commands and HMI screens used for metering.
Summary of Contents for BE1-CDS240
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Page 40: ...ii BE1 CDS240 Quick Start 9365200990 Rev F This page intentionally left blank ...
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Page 349: ...Figure 12 5 Horizontal Rack Mount Front View 9365200990 Rev F BE1 CDS240 Installation 12 5 ...
Page 361: ...Figure 12 17 Typical DC Connection Diagrams 9365200990 Rev F BE1 CDS240 Installation 12 17 ...
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