Fluke 1735 Service Guide
Energy studies with the
Fluke 1735 Power Logger
The rising cost of energy means that
optimal use of energy has become even
more critical.
The first step in managing energy is
understanding ‘how much and when’
energy is being used. To discover that, you
need a power logger. The logger captures
voltage, current, power, power factor and
energy, displays the measurements, and in
logging mode stores them over time.
Then, using software, you can graph
the measurements and highlight times
when extreme or unexpected energy
consumption is happening. For example,
if energy is being consumed at night or
at weekends, perhaps the HVAC system
needs to be re-programmed?
Once you have this kind of power and
energy profile, you can highlight potential
areas for energy savings.
Conduct the initial energy study at the
main utility power supply/service entrance.
Once you’ve measured overall power,
then conduct more focused studies
throughout the facility to profile individual
loads and estimate their effect on your
electricity bill.
Application Note
Recording current
and power with the
Fluke 1735
The compact, rugged Fluke 1735
Power Logger is an excellent tool
for performing energy studies.
It includes flexible current
•
probes for connecting around
multiple conductors or bus bars.
It has a PC interface and
•
software for downloading
measurements to a Windowsbased PC and creating professional reports for your
electrical plans.
From the Fluke Digital Library @ www.fluke.com/library
It measures voltage on three
•
phases and current on three
phases and neutral.
It records multiple parameters
•
that can help determine system
load, including voltage, current,
frequency, real power (kW),
apparent power (kVA), reactive
power (kVAR), power factor,
and energy (kWh).
Performing a load study with
the Fluke 1735 takes just
five steps:
1. Hook up to the feeders
or service.
2. Set power system parameters.
3. Set the recording time.
4. Start recording.
5. Download and review the
measurements.
1. Hook up to the feeders or
service. Using proper personal
protective equipment, connect
the Fluke 1735 to 120 V line
power and secure the area so
no one will tamper with your
setup. For a 3-phase wye
system there will be eight
connections:
Three phase voltages
•
Neutral voltage
•
Three phase currents
•
Neutral current
•
2. Set power system parame-
ters. Set the Network Topology
to wye or delta, to match the
system you are recording.
Verify the nominal voltage
(Mains Voltage) and line
frequency are correct.
3. Set the recording time. Set
the Fluke 1735 to 15-minute
averaging intervals and a
30-day recording duration.
4. Record the data. In the W
(power) position the Fluke
1735 will record a min, max,
and average of these values
every 15 minutes:
Power in Watts for each
•
phase and total
Reactive Power in VARs for
•
each phase and total
Apparent Power in VAs for
•
each phase and total
Power Factor for each phase
•
and average
Averages of Energy in kWh
•
and Reactive Energy in
kVARh
The trend screen will appear
and plot a new minimum,
maximum and average on the
display every fifteen minutes,
moving from left to right as
shown in Figure 3.
After 30 days, disconnect
the Fluke 1735 from the
source, take it to your computer, use the serial cable to
connect it, and download the
data into the Power Log Software included with the unit.
Figure 1 & 2. Sample setup screens for recording time and parameters.
2 Fluke Corporation Energy studies with the Fluke 1735 Power Logger
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