Errors in power-factor measurement due to terminal losses on short lengths of cable

Brockbank, R.A.

doi:10.1049/jiee-1.1932.0022

Cited by 3 publications

(1 citation statement)

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“…Evidence for the influence of surface conductivity on AC measurements in dielectrics is provided by the work of Brockbank (1932), who found that the power factor of short samples of various cables was considerably greater than that of long lengths of the same cables. The 'end effects' were shown to be due to current flow on the surface of the dielectric where the outer conductor had been stripped away for the measurement.…”

Section: Introductionmentioning

confidence: 99%

Surface component of vacuum absorption and resorption currents in polymers. III. A source of dielectric loss

Atkinson¹,

Fleming²

1980

J. Phys. D: Appl. Phys.

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For pt.II see ibid., vol.13, p.639 (1980). It is shown that, for a commercial co-polymer of hexafluoropropylene and tetrafluoroethylene, lateral charge transfer between the aluminium electrode edge and the immediately adjacent polymer surface dominates the dielectric loss currents in the frequency range 32 Hz-3.2 kHz. As a result the measured tan delta values vary with the electrode diameter. The variation decreases if the sample is allowed to age in air before dielectric loss measurements are made. This could be due to the formation of a thin oxide film on the aluminium electrode, and a decreasing probability of electron/hole tunnelling through the film as its thickness increases.

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Section: Introductionmentioning

confidence: 99%