Evaluation of the ZFX 240-kJ parallel-plate water capacitor: lessons learned

Kellogg, J.C.; Boiler, J.R.; Commisso, R.J.; Gerber, K. A.; Sethian, J. D.; Peterson, Giles; Swanekamp, S. B.

doi:10.1109/ppc.1995.596515

Cited by 2 publications

(1 citation statement)

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“…This leads to an unwanted conductivity that depends on the mobility of the injected ion, the electric field, and the intrinsic time constant of the capacitor ͑without charge injection͒. [11][12][13][14] Investigations and measurements show that for a water/ethylene glycol mixture, the mobility of the injected ions is similar to the mobility of the H ϩ ion. 8,[15][16][17] The drift speed for an ion in an electric field E is given by where ͓m 2 /Vs͔ is the mobility of the ion.…”

Section: Introductionmentioning

confidence: 99%

Dielectric study of water/methanol mixtures for use in pulsed-power water capacitors

Bolund

Berglund

Bernhoff

2003

Journal of Applied Physics

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Articles you may be interested inThe critical behavior of the dielectric constant in the polar + polar binary liquid mixture nitromethane + 3-pentanol: An unusual sign of its critical amplitude in the one-phase region J. Chem. Phys. 135, 024508 (2011); 10.1063/1.3607237 Temperature, concentration, and frequency dependence of the dielectric constant near the critical point of the binary liquid mixture nitrobenzene-tetradecane A ground level interpretation of the dielectric behavior of diluted alcohol-in-carbon tetrachloride mixtures Large pulsed-power systems normally use a solid capacitive primary storage and a water capacitor for secondary storage. It is shown that the electrical breakdown strength is increased and the maximum storage time is enhanced from the microsecond level to the millisecond level when the water is replaced by a water/methanol mixture. The increased time scale in the second storage enables the use of an inductive primary storage. The mixing of methanol in the water decreases the relative permittivity. However, due to the increased electrical breakdown strength, a higher energy density is nevertheless possible. Previous work with water/ethylene glycol has manifested the problem of charge injection that occurs when energy is stored for millisecond time scales at high electrical stress. Water/methanol mixtures show less tendency for charge injection and a better ability to store energy at millisecond time scales.

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