Fluke 434-II User Manual page 153

Introduction
This appendix describes the power measurement and energy loss calculation methods
used in the Fluke 430 Series II instruments.
Power Measurement Methods
The power measurement algorithms used in Fluke 430 Series II instruments are based
upon the Unified Method developed at the Polytechnical University of Valencia, and
build upon the IEEE1459 standard. These algorithms provide correct results at all
conditions, even with distorted unbalanced three phase systems. These methods make it
possible to calculate the energy that is lost if power quality is not optimal.
Energy Loss Calculation
The Energy Loss Calculator uses Line Power Loss (caused by the various currents
flowing through the line resistance) and Residual Power Loss (caused by Harmonics and
Unbalance) to measure the following losses in Ws (Joule):
Effective Loss
Reactive Loss
Unbalance Loss line power loss due to unbalance system current and due to unbalance
Distortion Loss
Neutral Loss
The line resistance is either calculated automatically using an estimated 3% loss for the
active system power, or it uses the values entered in the Function Preference setting.
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Measuring Methods
line power loss due to active system current (this current does the
actual work in transferring energy in the most optimal way. Loss
reduction can be done by lowering line resistance for example by using
thicker wires)
line power loss due to reactive system current. Reactive energy itself
does not cause losses.
residual power.
line power loss due to harmonic system current and due to harmonic
residual power.
line power loss due to neutral current.
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