NDLI: Electronic Load-Angle Measurement with Unusually Fast Response

Content Provider	IEEE Xplore Digital Library
Author	Kabriel, Bohumil J. Evans, F. J.
Copyright Year	1963
Description	A dc output voltage proportional to the phase angle between any two accessible points in an ac system is generated by the circuitry described in this paper. The transient response of the output voltage involves delays of less than one ac cycle, which represents an advance upon established techniques, and the linearity is of the order of 1 percent. The device has been used for alternator load-angle measurement and in sensing for control of excitation of an alternator in response to load-angle changes. Essentially, a flip-flop is turned on by one of the ac input waveforms and is turned off again by the waveform derived from the other point in the system with respect to which the phase angle is to be measured. To achieve the fast transient response there are six such flip-flops and thus six output pulses per ac cycle, which are then passed through a T-section m-derived filter with band rejection at six times the basic ac frequency. Discrete transistors have been used and their number has been kept to a minimum by the use of circuits with three and six stable states.
Sponsorship	IEEE Instrumentation and Measurement Society Bureau international des poids et mesures IEEE International Bureau of Weights and Measures (BIPM) URSI NBS Agency Ind. Sci. & Technol., Min. Int. Trade & Ind. Sci. Council Japan International Union of Pure and Applied Physics (IUPAP) NIST NRCC National Conference of Standards Laboratories (NCSL) Allen Osborne Associates Andeen-Hagerling, Inc. Ballantine Lab. Inc. Clarke-Hess Communications Research Corp. Fluke Corporation Guildline Instruments Hewlett-Packard Co. Julie Res. Lab. Inc. Keithley Instruments, Inc. Measurements International Ltd. Canada QuadTech Inc. Quantum Design Inc. Rotek Instrum. Corp. Tegam Inc. Tektronix Inc
Starting Page	51
Ending Page	56
Page Count	6
File Size	2485114
File Format	PDF
ISSN	00189456
Volume Number	19
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1970-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage Circuits Transient response Alternators Flip-flops AC generators DC generators Delay Linearity Phase measurement
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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