Abstract
Expressing uncertainty of active power measurement by means of electrodynamic wattmeter
Highlights
The measurement of the active power P is of great importance in power engineering, especially in area of the designing, testing, monitoring, and maintenance of the energy supply networks and of electrical equipment
Intention in this paper is to present the concept of measurement uncertainty in expressing of the results of the active power measurements of the single-phase load by means of electrodynamic wattmeter, which does not have a compensating winding
In this paper an approach is introduced with the aim of providing guidance for the estimation of measurement uncertainty of active power measurement of the singlephase load using electrodynamic wattmeter
Summary
The measurement of the active power P ( called real power) is of great importance in power engineering, especially in area of the designing, testing, monitoring, and maintenance of the energy supply networks and of electrical equipment. The error approach (sometimes called traditional approach or true value approach) has been used in presenting results of active power measurements by means of electrodynamic wattmeter in almost all scientific and professional papers or text books, as for example [1÷7]. Intention in this paper is to present the concept of measurement uncertainty in expressing of the results of the active power measurements of the single-phase load by means of electrodynamic wattmeter, which does not have a compensating winding. The focus in this paper is on the active power measurement result in mains frequency circuit and its evaluated uncertainty rather than on the unknowable quantities "true" value of active power and measurement error. In this paper will be analysed measurement uncertainty only for the case of direct connection of electrodynamic wattmeter in alternating electrical circuit with single-phase load. For the steady-state operation of single-phase electrical system with linear load supplied with sinusoidal voltage, the overwhelming majority of the active power measurements using electrodynamic wattmeter are single measurements, and only such kind of active power measurements will be analysed in this paper, too
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