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Time-lag properties of corona streamer discharges between impulse sphere and dc needle electrodes under atmospheric air conditions
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10.1063/1.4791587
/content/aip/journal/rsi/84/2/10.1063/1.4791587
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/2/10.1063/1.4791587
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Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram of spherical and needle electrodes made of stainless steel (SUS304). The spherical electrode is 62 mm in diameter, whereas the needle electrode has a length of 60 mm, a cross-sectional diameter of 1.2 mm, and a spherical tip of radius 0.6 mm. The inter-electrode gap length (d g) is maintained at a constant value of 20 mm, and the gap consists of air under normal atmospheric conditions.

Image of FIG. 2.
FIG. 2.

Schematic diagram of experimental setup. A lightning impulse generator (LIG) with a standard lightning impulse waveform (e.g., an IEC standard of 1.2/50 μs) is connected to a spherical electrode, and a dc power supply (DCPS) consisting of a 0.1 μF charged capacitor and a 4.7 kΩ discharge resistor is connected to a needle electrode. The LIG and DCPS are commonly charged by the output voltage of a half-wave rectifier using diode D+ or D. Streamer discharge waveforms are measured using a HVP: high-voltage probe and CP1 and CP2 high-resolution current probes.

Image of FIG. 3.
FIG. 3.

Emission photographs of corona streamer path: (a) positive sphere-to-negative needle (pS−nN) discharge, (b) negative sphere-to-positive needle (nS−pN) discharge.

Image of FIG. 4.
FIG. 4.

Discharge waveforms of voltage (V d) and current (I d) for (a) pS−nN electrodes, (b) nS−pN electrodes. The time difference between V d and I d represents the time lag (t d).

Image of FIG. 5.
FIG. 5.

V dt d as a function of electrode shape and polarity at V d = V 50, where S−S and S−N represent the positive sphere-to-grounded sphere and positive or negative sphere-to-grounded needle electrodes, respectively. Regressions of V IG, V IG+, and V IG− are shown as two solid and a dashed lines, respectively, with analytical expressions next to the curves.

Image of FIG. 6.
FIG. 6.

V dt d at V d > V 50 in positive sphere-to-grounded needle (pS−gN) and negative sphere-to-grounded needle (nS−gN) electrodes. Regressions of V IG+ and V IG− are shown as solid and dashed lines, respectively, with analytical expressions next to the curves.

Image of FIG. 7.
FIG. 7.

V d , V IG+, and V DC− as functions of t d in a pS−nN electrode at V d > V 50, where the absolute voltages of V d, V IG+, and V DC− are related by V d = V IG+ + V DC−. Regressions of V d, V IG+, and V DC− are shown as solid, dashed, and short-dashed lines, respectively, with analytical expressions next to the curves.

Image of FIG. 8.
FIG. 8.

V d, V IG−, and V DC+ as functions of t d for a nS−pN electrode at V d > V 50, where the absolute voltages of V d, V IG−, and V DC+ are related by V d = V IG− + V DC+. Regressions of V d, V IG−, and V DC+ are shown as solid, dashed, and short-dashed lines, respectively, with analytical expressions next to the curves.

Image of FIG. 9.
FIG. 9.

Power exponent (k) as a function of electrode configuration and polarity, where S−N ⇒ pS−gS at V d = V 50, S−N (1) ⇒ pS−gN and nS−gN at V d = V 50, S−N (2) ⇒ pS−gN and nS−gN at V d > V 50, and S−N (3) = > pS−nN and nS−pN at V d > V 50.

Image of FIG. 10.
FIG. 10.

Laue distribution based on survivor probability (p) and t d in (a) positive and (b) negative sphere sets representing the polarity combinations sphere-to-sphere and sphere-to-needle.

Image of FIG. 11.
FIG. 11.

Values of t d (composed of t f and t s) in (a) positive sphere (pS) and (b) negative sphere (nS) sets, where (1) and (2) represent the conditions V d = V 50 and V d > V 50, respectively.

Image of FIG. 12.
FIG. 12.

Dependence of t d on k for the polarity combinations “pS set” and “nS set.” The black-filled circles represent the pS–gS electrodes without corona generation.

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/content/aip/journal/rsi/84/2/10.1063/1.4791587
2013-02-15
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Time-lag properties of corona streamer discharges between impulse sphere and dc needle electrodes under atmospheric air conditions
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/2/10.1063/1.4791587
10.1063/1.4791587
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