Comparative study of electrical breakdown properties of deionized water and heavy water under pulsed power conditions

Prakash G. Veda; Kumar R.; Saurabh K.NasirAnitha V. P.Chowdhuri M. B.Shyam A.

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Comparative study of electrical breakdown properties of deionized water and heavy water under pulsed power conditions

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A comparative study of electrical breakdown properties of deionized water (H2O) and heavy water (D2O) is presented with two different electrode materials (stainless steel (SS) and brass) and polarity (positive and negative) combinations. The pulsed (similar to a few tens of nanoseconds) discharges are conducted by applying high voltage (similar to a few hundred kV) pulse between two hemisphere electrodes of the same material, spaced 3 mm apart, at room temperature (similar to 26-28 degrees C) with the help of Tesla based pulse generator. It is observed that breakdown occurred in heavy water at lesser voltage and in short duration compared to deionized water irrespective of the electrode material and applied voltage polarity chosen. SS electrodes are seen to perform better in terms of the voltage withstanding capacity of the liquid dielectric as compared to brass electrodes. Further, discharges with negative polarity are found to give slightly enhanced discharge breakdown voltage when compared with those with positive polarity. The observations corroborate well with conductivity measurements carried out on original and post-treated liquid samples. An interpretation of the observations is attempted using Fourier transform infrared measurements on original and post-treated liquids as well as in situ emission spectra studies. A yet another important observation from the emission spectra has been that even short (nanosecond) duration discharges result in the formation of a considerable amount of ions injected into the liquid from the electrodes in a similar manner as reported for long (microseconds) discharges. The experimental observations show that deionised water is better suited for high voltage applications and also offer a comparison of the discharge behaviour with different electrodes and polarities. (C) 2016 AIP Publishing LLC.

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《Review of Scientific Instruments》 |2016年第1期|015115-1-015115-7|共7页
作者
Prakash G. Veda; Kumar R.; Saurabh K.NasirAnitha V. P.Chowdhuri M. B.Shyam A.;
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Inst Plasma Res, Bhat 382428, Gandhinagar, India;

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正文语种英语
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Comparative study of electrical breakdown properties of deionized water and heavy water under pulsed power conditions

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