Wattmeter
The wattmeter is an apparatus which measures the electric output consumed by a receiver or provided by an electric generator.
Principle
The wattmeter single-phase current is provided with a sensor of running (Ampèremètre), of a sensor of tension (Voltmètre) followed by a multiplier. This last posts the median value of the instantaneous product of these two sizes. Measurements in mode Triphasé are carried out with several wattmeters single-phase currents.
Cablâge of a wattmeter
Wiring in mode single-phase current
To be able to carry out these measurements, the two terminals of the sensor of current must be in series with the dipole and the two terminals of the sensor of tension in parallel of the dipole which one measures the consumption or produced.
It is necessary simultaneously to respect the limitations of the two sensors under penalty of destruction of the apparatus.
The diagram below represents the typical wiring of a wattmeter measuring the consumption by a dipole. It is noticed that the sensor of current is connected to the Neutral of the installation. When this provision is possible, one limits the error in common mode to the measure of the intensity because the potentials of the terminals has and A' is weak.
Wiring in three-phase current
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Simulation of the measurement of a power
External bonds
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Definition of the wattmeter on energy-environnement.ch
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