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Dielectric response of oil impregnated kraft paper has been measured in the frequency range 8 Hz to 2 MHz in a custom designed test cell. Temperature was varied between -17 and 60degC, allowing master curves for 20degC condition to be established for the frequency range 10 mHz to 10 MHz. Paper types and moisture was varied. The dielectric response showed losses in the low frequency region dominated...
Streamer inception as a function of temperature was studied in pure cyclohexane in needle-plane geometry under impulse voltage with a positive needle electrode. The temperature of the sample volume was regulated to 0, 20, 40 and 60degC, where 0degC is below the freezing point of cyclohexane (6degC). A sensitive differential charge measurement, with sensitivity down to 0.1 pC, and a photomultiplier...
Temperature cycling and temperature gradients can cause super saturation of water vapor in the insulation. Condensation of water can then occur and high hydrostatic pressures can be established within water droplets embedded in the polymer. Water treeing is closely related to the condensation of water, and the main purpose of this paper has therefore been to examine the effect of different cooling...
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