Application Note

ManualsBrandsFluke ManualsPower and Energy LoggersFluke 1735

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 Windows-

based PC and creating pro-

fessional reports for your

electrical plans.

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.

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).

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.

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.

Summary of content (4 pages)

PAGE 1
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.
PAGE 2
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 parameters. Set the Network Topology to wye or delta, to match the system you are recording.
PAGE 3
5. Download and review the measurements. For 30 days of recording, with a measurement every 15 minutes, you will have 2880 sets of measurements. Use Power Log to graph this data, find the average current or power on each phase, compare the three phases and report the largest number. Figure 4 shows three phase-current recordings, zoomed in to show detail. Power Log has a built-in report generator that includes graphs of current and real power.
PAGE 4
The Fluke 1735: Three-phase Harmonics and Event Recording The Fluke 1735 is the ideal electrician’s tool for recording and analyzing power and energy in commercial and industrial facilities.