The use of the electrostatic method for the measurement of power

Paterson, C.C.; Rayner, E.H.; Kinnes, A.

doi:10.1049/jiee-1.1913.0056

Cited by 8 publications

(4 citation statements)

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“…However, unavoidable in~ ductance and stray capacitance errors limit th eir use~ul frequency range and present little hope for the desIred extension . Electrostatic instrumen ts have been carefully studied [4,5] at the National Physical Laboratory. They are u~eful over wide frequency ranges, but because of theIr low-torqu e-weight ratio at low voltage are not readily adap table for either th e low voltage or th e current ranges desired in this application.…”

Section: Choice Of Standard Smentioning

confidence: 99%

“…For ac-dc differ ence or tral13fer test , which are more frequent and usually more important than straight a-c tests, the test and standard instruments are connected in serie to the AO-DO posts 4 in the case of ammeters, or in parallel with suitable coaxial leads to th e A V-DV receptacles in the case of voltmeters. S uitable short leads are used to connect the two AV r ecepLacles together a nd to connect the two DV recep taele together.…”

Section: 4 Use Of Instrumentsmentioning

confidence: 99%

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Thermal converters as AC-DC transfer standards for current and voltage measurements at audio frequencies

Hermach¹

1952

J. RES. NATL. BUR. STAN.

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Thermal con verters and associated equipment that are used as ac-dc transfer standards at t he National Bureau of Standards for the precise measurement of current and voltage at power and audio frequencies are described. The tandards and t h e equipment are primarily used to standardize a-c ammeters and voltmeters submitted to the Bureau for certification. Th e ac-dc transfer may be made with t hese thermal converters at currents from 1 milliampere to 50 amperes, voltages of 0.2 to 750 volts, with an accuracy of 0.01 percent at frequencies from 25 to 20,000 cycles per second.The special tests to ins ure t he required accuracy of the transfer standards are described, and the results are presented. A number of factors that limit the transfer accuracy of thermal con verters have been discovered, and the results of special tests and theoretical work to evaluate these factors are discussed. The solu t ions, by an approximation method, of certain pertinent nonlinear differential eq uations governing the heating of a conductor by an electric cun'ent arc given.

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Section: Choice Of Standard Smentioning

confidence: 99%

Section: 4 Use Of Instrumentsmentioning

confidence: 99%

Thermal converters as AC-DC transfer standards for current and voltage measurements at audio frequencies

Hermach¹

1952

J. RES. NATL. BUR. STAN.

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“…Kelvin subsequently developed the quadrant electrometer from the divided ring electrometer (Thomson, 1867b) which later became important for measurements in the UK's nascent electrical engineering industry (e.g. Wilson, 1898;Paterson et al, 1913).…”

Section: Portable Measurementsmentioning

confidence: 99%

“…The sensitive detection of small currents at the end of long telegraph lines, such as with his patented mirror galvanometer, may have shown atmospheric effects on the telegraph network. His detailed study of atmospheric electricity in turn motivated development of sensitive electrometers (Paterson et al, 1913;Simpson, 1929). Another motivation, apparent from his notebooks, was to test the application of potential theory, through atmospheric electrical measurements around flat and undulating surfaces.…”

Section: Introductionmentioning

confidence: 99%

Lord Kelvin's atmospheric electricity measurements

Aplin

Harrison

2013

Hist. Geo Space. Sci.

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Abstract. Lord Kelvin (William Thomson) made important contributions to the study of atmospheric electricity during a brief but productive period from 1859-1861. By 1859 Kelvin had recognised the need for "incessant recording" of atmospheric electrical parameters, and responded by inventing both the water dropper equaliser for measuring the atmospheric potential gradient (PG), and photographic data logging. The water dropper equaliser was widely adopted internationally and is still in use today. Following theoretical considerations of electric field distortion by local topography, Kelvin developed a portable electrometer, using it to investigate the PG on the Scottish island of Arran. During these environmental measurements, Kelvin may have unwittingly detected atmospheric PG changes during solar activity in August/September 1859 associated with the "Carrington event", which is interesting in the context of his later statements that solar magnetic influence on the Earth was impossible. Kelvin's atmospheric electricity work presents an early representative study in quantitative environmental physics, through the application of mathematical principles to an environmental problem, the design and construction of bespoke instrumentation for real world measurements and recognising the limitations of the original theoretical view revealed by experimental work.

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A precise electrometer method for voltage-transformer testing

Spilsbury¹

1929

Journal of the Institution of Electrical Engineers

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The use of the electrostatic method for the measurement of power

Cited by 8 publications

References 0 publications

Thermal converters as AC-DC transfer standards for current and voltage measurements at audio frequencies

Thermal converters as AC-DC transfer standards for current and voltage measurements at audio frequencies

Lord Kelvin's atmospheric electricity measurements

A precise electrometer method for voltage-transformer testing

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