Statistical time lags in low‐pressure SF6breakdown

1989 ◽  
Vol 66 (7) ◽  
pp. 2920-2925 ◽  
Author(s):  
G. A. Woolsey ◽  
D. B. Ogle
Keyword(s):  
Low Pressure ◽  
Time Lags ◽  
Statistical Time

A statistical interpretation of the electrical breakdown of liquid dielectrics

1962 ◽  
Vol 269 (1337) ◽  
pp. 233-248 ◽  
Keyword(s):  
Short Duration ◽  
Electrical Breakdown ◽  
Short Pulse ◽  
Time Lag ◽  
Step Function ◽  
Time Lags ◽  
Statistical Interpretation ◽  
Breakdown Time ◽  
Formative Time ◽  
Statistical Time

Previous investigators, when measuring the electric strength of hydrocarbon liquids with short-duration rectangular pulses, have assumed that the statistical component of the breakdown time was insignificant com pared with the formative time. In the present investigation, however, the time to breakdown was measured directly by the use of step-function pulses, and clear evidence for a statistical time lag was found. The formative time was ~ 0.1 us, being less than that given by previous estimates. A statistical interpretation of short-pulse measurements is presented and this provides a consistent explanation of the results of other workers. Furthermore, by using an experimentally derived equation for the variation of the mean rate of breakdown f ( E ) with applied stress E , it has been shown that the form of the relationship between strength and pulse duration obtained by other workers agrees with that obtained by a statistical analysis. Experiments on air-saturated n -hexane with both short-duration and step-function pulses support the statistical ideas presented and indicate that electrode conditions are extremely important. It was found that strength and time to breakdown were affected by the number of breakdown measurements on a sample. Experiments with gas-free n -hexane and non-uniform fields have demonstrated the importance of air content when long duration pulses are used. It was found that, although the statistical time lag was insignificant, formative time lags as long as 10 ys occurred with a point cathode-sphere anode configuration.

scholarly journals Statistical Time Lags in Metal Halide Lamps

1984 ◽  
Vol 68 (6) ◽  
pp. 248-253
Author(s):  
Hiromitsu Matsuno ◽  
Seiichi Murayama
Keyword(s):  
Metal Halide ◽  
Time Lags ◽  
Statistical Time ◽  
Metal Halide Lamps

Statistical time lags in mixtures of SF 6 and air

1965 ◽  
Vol 16 (2) ◽  
pp. 181-183 ◽  
Author(s):  
D F Binns ◽  
C L Dargan
Keyword(s):  
Time Lags ◽  
Statistical Time

The impulse breakdown voltage and time-lag characteristics of long gaps in air I. The positive discharge

1964 ◽  
Vol 256 (1069) ◽  
pp. 185-212 ◽  
Keyword(s):  
Space Charge ◽  
Wave Front ◽  
Breakdown Voltage ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Time Lag ◽  
Short Wave ◽  
Time Lags ◽  
Long Time ◽  
Statistical Time

The electrical breakdown of rod/rod, rod/sphere and rod/plane gaps in the atmosphere has been examined oscillographically and photographically. Positive polarity impulse potentials of crest value up to 1 MV, of wave-front variable between 0.06 and 2.0 μs and of wave tail 2 ms were used. It has been found that the lack of a sharply defined breakdown potential was due to the existence of long time lags quite distinct from the shorter times to breakdown observed with the conventional short wave-tail impulse. A ‘ dead-time ’ of low probability of breakdown on the wave tail separated the two classes of breakdown. The breakdown voltage of a rod/rod gap has been found to be dependent upon the wave front of the impulse. An accompanying photographic examination of the initial corona phase of breakdown also revealed a variation with the impulse voltage wave front. It is shown that these results were consistent with the electric field distortion arising from space charge. The corona phase of breakdown was responsible for this space charge. The statistical behaviour of long gap breakdown was due to random variations in the corona phase. The effect of the statistical time lag in the production of initiatory electrons upon the corona phase is discussed. A rotating-mirror camera of f/1.0 aperture and a technique for controlled suppression of the breakdown enabled the growth of the discharge with time to be studied in some detail. It was shown that the positive leader either preceded or was coincident with the negative leader, depending upon the gap arrangement. It is concluded that the establishment of the leader at the high-tension electrode is the criterion for breakdown. The role of the earthed cathode in aiding this leader development was dependent upon its size and geometry. For cathodes of small dimensions the occurrence of a negative corona phase increased the anode electric gradient; for large cathodes the surface charge induced by the anode corona discharge became important. The variation of breakdown strength with gap geometry is accountable in these terms.

Mixture distributions for the statistical time delay in synthetic air at low pressure

2014 ◽  
Vol 67 (2) ◽  
pp. 20801 ◽  
Author(s):  
Aleksandar P. Jovanović ◽  
Biljana Č. Popović ◽  
Vidosav Lj. Marković ◽  
Suzana N. Stamenković ◽  
Marjan N. Stankov
Keyword(s):  
Time Delay ◽  
Low Pressure ◽  
Mixture Distributions ◽  
Statistical Time

scholarly journals Statistical time lags in ac discharges

2011 ◽  
Vol 44 (13) ◽  
pp. 135203 ◽  
Author(s):  
A Sobota ◽  
J H M Kanters ◽  
E M van Veldhuizen ◽  
F Manders ◽  
M Haverlag
Keyword(s):  
Time Lags ◽  
Statistical Time
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