NDLI: Reduction of Transformer Exciting Current to Sine-Wave Basis

Content Provider	IEEE Xplore Digital Library
Author	Camilli, G.
Copyright Year	1884
Abstract	As a sequel to an earlier investigation and development of a method for the reduction of core-loss measurement to sinewave basis, this paper describes two methods developed for the reduction of exciting current to sine-wave basis. The first method consists of making two measurements at wave shapes as widely different as possible, setting the voltage in each case by means of the flux voltmeter. The current corresponding to sine-wave voltage is obtained by extrapolation from the observed values of currents and form factors. Although the method might be considered to some extent empirical, it is found to yield an accuracy within one per cent even under extremely unfavorable conditions. The second method utilizes as before the flux voltmeter for setting the voltage but uses a ``crest ammeter'' (developed for this purpose) for reading the instantaneous maximum values of the corresponding currents. Measurements are made at 100 per cent, 86.6 per cent and 50 per cent voltages. These data determine the fundamental, third and fifth harmonics of the exciting current corresponding to sine-wave voltage and hence the exciting current itself, because these harmonics are the only important components in determining the effective value of the exciting current. Theory of the crest ammeter is given, and its applicability (in conjunction with the flux voltmeter) to the determination of d-c. saturation curves by means of a-c. tests in magnetic investigations is indicated.
Starting Page	692
Ending Page	696
Page Count	5
File Size	1499877
File Format	PDF
ISSN	00963860
Volume Number	XLVI
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1927-01-01
Publisher Place	New York, U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage Voltmeters Shape measurement Ammeters Circuit faults Transformer cores Current measurement Extrapolation Testing Magnetic flux
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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