Conclusions
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1.
It is advisable to discontinue the production of single-element three-phase laboratory and rack-mounted phase meters and replace them by multi-element meters.
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2.
In selecting the type of phase meter for a multi-phase network it is necessary to take into account above all the degree of asymmetry of the system in which the instrument is to be used.
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3.
In rare cases when the degree of current and voltage asymmetry does not exceed 0.3–0.4%, it is possible to use an ordinary single-phase phase meter for evaluating the power factor of three-phase systems.
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4.
In the case of an asymmetry of (ε′u=ε′i=0.05), which is characteristic for virtually symmetrical systems, it is necessary to use multi-element three-phase phase meters.
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5.
Expression (1) should not be used for determining the power factor in cases of outstanding asymmetry (εu,εi≫0.05). In such cases relationships (4, 5) should be considered an objective criterion of the degree to which the load approaches its optimum value. This criterion can be used as an economic stimulus for improving loading when large quantities of electrical energy are transmitted in three-phase systems.
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Literature cited
S. I. Kirpatovskii, Izv. vuz., Énergetika, No. 2 (1959).
L. S. Lur'e, Élektrichestvo, No. 3 (1951).
V. I. Bakaeva and V. A. Khomyak, Izmerit. tekhn., No. 2 (1966).
V. A. Khomyal, Izmerit. tekhn., No. 3 (1966).
Additional information
Translated from Izmeritel'naya Tekhnika, No. 9, pp. 56–58, September, 1967.
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Nesterenko, A.D., Khomyak, V.A. Measurement of the power factor of three-phase asymmetrical systems. Meas Tech 10, 1100–1103 (1967). https://doi.org/10.1007/BF00982888
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DOI: https://doi.org/10.1007/BF00982888