Preionization Control of Streamer Propagation

Bradley, L. P.

doi:10.1063/1.1661299

Cited by 19 publications

(5 citation statements)

References 8 publications

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“…This linear arc phenomenon has been associated with a laser-enhanced streamer propagation or channelling (Bradley andDavies 1971, Bradley 1972). Bradley performed experiments in which he has enhanced the velocity of an already propagating streamer by volume pre-ionisation from a laser focused ahead of the streamer.…”

Section: Basic Theorymentioning

confidence: 99%

The laser triggering of high-voltage switches

Guenther

Bettis

1978

J. Phys. D: Appl. Phys.

135

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The laser-triggered switching (LTS) of high-voltage spark gaps is considered. The basic theory is presented which predicts dependencies of the delay to breakdown and switching jitter on such variables as fill gas mixture and pressure, gap spacing, polarity, and geometry. It is shown that electrical arcs of several metres length can be directed by laser action. A complete set of experiments is reported which adequately support the proposed theory. The performance of LTS is considered and results are reported on multiple gap triggering, multiple channel triggering, triggering of voltages in excess of 3 mV, repetitive switching at rates up to 50 pps with subnanosecond jitter, as well as various geometries, pulse forming demonstrations, and output voltage selection on a Marx generator.

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Section: Basic Theorymentioning

confidence: 99%

The laser triggering of high-voltage switches

Guenther

Bettis

1978

J. Phys. D: Appl. Phys.

135

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“…Because the triggering spark radiation propagates in the form of a spherical wave and there are varying degrees of field enhancement at the cathode surface, the initial homogeneous discharge is observed in figure 5(a). It has been proved that pre-ionization ahead of a formed streamer can accelerate its propagation [27], which can explain why the initial discharge velocity on the cathode side (0.56 mm ns −1 ) is higher than that on the anode side (0.21 mm ns −1 ).…”

Section: Discussionmentioning

confidence: 99%

“…One probable reason is that nearby neutral molecules absorb most photons generated by the trigger gap discharge and only a few reach the cathode surface. Therefore, few initial electrons are generated at the cathode surface, and the intensity of continuous pre-ionization [27] is weakened to a great degree, which might restrain the cathode discharge. Figure 8(d) provides a breakdown model of the anode side sub-gap.…”

Section: Discussionmentioning

confidence: 99%

Comparative study of pulsed breakdown processes and mechanisms in self-triggered four-electrode pre-ionized switches

Wang¹,

Sun²,

Yang³

et al. 2022

Plasma Sci. Technol.

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This work investigates the pulsed breakdown processes and mechanisms of self-triggered pre-ionized switches with a four-electrode structure in nitrogen through ICCD (Intensified Charge Coupled Device) photographs. The diameter of the trigger plane hole mainly determines the switch’s electric field distribution. Two configurations with minimum and maximum trigger plane holes are adopted for comparison. In the switch with a minimum trigger plane hole, the maximum electric field distributes at the surfaces of the main electrodes. Though charged particles in the triggering spark channel cannot drift out, homogeneous discharges can be stimulated from both the cathode and anode surfaces through UV (ultraviolet) illumination. Two sub-gaps are likely to break down simultaneously. In the switch with a maximum trigger plane hole, the maximum electric field locates near the trigger electrodes. Discharges in both sub-gaps initiate from the trigger electrodes in the form of a positive or negative streamer. Due to lower breakdown voltage and electric field threshold for discharge initiation, the cathode side sub-gap breaks down first. The analysis of two extreme examples can be referenced in the future design and improvement of self-triggered four-electrode switches with different structures of trigger electrodes.

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“…A decrease in the velocity of propagation of the streamer head with a n increase in the distance between the metallic particle and the insulator surface is associated with the role the insulator plays in the multiplication of charge carriers. It has been shown that the streamer propagation velocity is a function of the charge density a t the head of the streamer channel [21]. The velocity is found to be proportional to the cube root of the charge density a t the streamer tip [22].…”

Section: Experimental Arrangementmentioning

confidence: 99%

The effect of a metallic particle near a spacer on flashover phenomena in SF/sub 6/

Mazurek

Cross

Heeswijk

1993

IEEE Trans. Elect. Insul.

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This paper presents a study of the flashover mechanism initiated by metallic particles in SF6 gas. Using a high-speed Imacon photographic camera it was established that a metallic particle near the insulator surface plays an important role in flashover development. The influence of the particle on flashover development depends on the pressure of the SF6 gas. At atmospheric pressure, the flashover was always initiated at a point on the particle farthest from the nearest electrode. At high pressures, it was found that breakdown develops from the electrode of relative positive polarity in the form of a leader. The velocity of the discharge crossing the gap increases exponentially when the distance between the particle and the insulator surface decreases.

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Preionization Control of Streamer Propagation

Cited by 19 publications

References 8 publications

The laser triggering of high-voltage switches

The laser triggering of high-voltage switches

Comparative study of pulsed breakdown processes and mechanisms in self-triggered four-electrode pre-ionized switches

The effect of a metallic particle near a spacer on flashover phenomena in SF/sub 6/

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