Review on gas switches developed for fast linear transformer driver

Peitian, 丛培天 Cong; Aici, 邱爱慈 Qiu

doi:10.3788/hplpb20122406.1263

Cited by 6 publications

(3 citation statements)

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“…In this case, the AC breakdown voltage of the gas exhibited an exponential increase with the increase of pd . At pd > 1.5 mm MPa, the AC breakdown voltage of gas was affected by the roughness of the electrode and other factors. − The AC breakdown voltage of gas increases with the increase of pd , but it no longer showed an exponential trend. Formula proposed in this paper is no longer applicable.…”

Section: Calculation Of Ac Breakdown Voltage Of Insulating Gasmentioning

confidence: 99%

Research and Analysis of Insulating Gas in Unified Test Conditions

et al. 2022

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In order to study the insulation mechanism of SF 6 substitute gas, it is suggested to calculate the dielectric strength of insulating gas from the molecular structure. The dielectric strength of a typical gas is modeled by a power frequency breakdown test under a uniform electric field. The molecular parameters of insulating gases are calculated by the density functional theory method, and the effect of molecular structure parameters on the breakdown voltage of power frequency is studied. Based on the molecular structure parameters, which are closely related to the breakdown voltage of power frequency, a model of pressure and distance variation of AC breakdown voltage of insulating gas is established. The breakdown voltages of insulating gases (CF 3 SO 2 F) are also derived from the proposed model. The calculated breakdown voltage of power frequency of two gases is compared with the experimental value. The average error is just 2.6%. This model provides a basis for the future search for potential alternative insulating gases.

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Section: Calculation Of Ac Breakdown Voltage Of Insulating Gasmentioning

confidence: 99%

Research and Analysis of Insulating Gas in Unified Test Conditions

et al. 2022

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“…It can be seen from Figure 6.b that as the main electrode gap increases from 0.8 mm to 2.6 mm, the self-breakdown voltage of the planar spark gap switch gradually increases, and the operating voltage also increases. When the main electrode gap is a maximum of 2.6 mm, the self-breakdown voltage of the switch can reach 3480 V, which indicates that the maximum operating voltage of the switch is 3480 V. According to Thomson's theory and Baschen's law [24,25] of uniform electric field self-discharge under low pressure, the breakdown voltage USB of the air gap is related to the air pressure p and the main electrode gap b, and under the condition of a fixed gas atmosphere, the maximum operating voltage It can be seen from Figure 6.b that as the main electrode gap increases from 0.8 mm to 2.6 mm, the self-breakdown voltage of the planar spark gap switch gradually increases, and the operating voltage also increases. When the main electrode gap is a maximum of 2.6 mm, the self-breakdown voltage of the switch can reach 3480 V, which indicates that the maximum operating voltage of the switch is 3480 V. According to Thomson's theory and Baschen's law [24,25] of uniform electric field self-discharge under low pressure, the breakdown voltage U SB of the air gap is related to the air pressure p and the main electrode gap b, and under the condition of a fixed gas atmosphere, the maximum operating voltage U SB is positively correlated with b.…”

Section: Static Self-breakdown Characteristicsmentioning

confidence: 99%

Research on Characteristics of Copper Foil Three-Electrode Planar Spark Gap High Voltage Switch Integrated with EFI

et al. 2022

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In view of the low-energy explosion foil detonation system’s requirements for the integration technology of high-voltage switches and technical overload resistance technology, a magnetron sputtering coater is used to sputter copper film on the surface of the substrate. The thickness is 4.0 μm, the radius of the main electrode is 4 mm, the trigger electrode is 0.6 mm and 0.8 mm, and the main gaps are 0.8 mm, 1.0 mm, 1.2 mm mm, 1.8 mm, 2.0 mm, 2.2 mm, and 2.6 mm. Copper foil three-electrode planar spark gap high voltage switches are designed and manufactured; and the static self-breakdown characteristics, dynamic operating characteristics, and discharge life characteristics of the three-electrode planar spark gap high voltage switch based on copper foil are studied in this paper. The test results show that with the increase of the main electrode gap from 0.8 mm to 2.6 mm, the self-breakdown voltage of the planar spark gap switch increases, and the working voltage also increases. When the main electrode gap is a maximum of 2.6 mm, the self-breakdown voltage of the switch can reach 3480 V, which indicates that the maximum operating voltage of the switch is 3480 V. When the charging voltage is 2.0 kV, with the increase of the main electrode gap from 0.8 mm to 2.6 mm, the minimum trigger voltage value of the planar spark gap switch increases from 677 V to 1783 V (a = 0.6 mm), and from 685 V to 1766 V (a = 0.8 mm), the switch on time is 16 ns, 22 ns, 28 ns, 48 ns, 64 ns, 77 ns, 93 ns (a = 0.6 mm), and 26 ns, 34 ns, 51 ns, 67 ns, 81 ns, 102 ns (a = 0.6 mm). With the increase of the gap between the two main electrodes of the switch, the maximum static working voltage of the three-electrode plane spark gap high-voltage switch increases, the minimum trigger voltage value also increases, and the on-time of the switch gradually becomes longer. The peak current of the discharge circuit decreases and the dynamic impedance and inductive reactance of the switch also increase; as the width of the trigger electrode increases, the minimum trigger voltage decreases, the dynamic impedance and inductance decrease, and the switch operating voltage with the same parameters is higher. The easier the switch is to turn on, the lower the minimum trigger voltage. The electrode thickness of the three-electrode plane spark gap switch has a certain influence on the field strength and the service life of the switch. The results of this study provide useful references for promoting the research and development of LEEFIs.

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“…Wakeland et al (2007) reported the erosion performance of different electrode materials for ZR machine [19]. Cong and Qiu [20] reviewed erosion phenomenon in spark gaps of big pulsed power facilities and summarized the approaches for alleviating electrode erosion [20]. Wu et al [14] established a compact platform and conducted an aging test of W-Cu electrodes for 20 000 shots (~17.16 kC total transferred charge) [14].…”

Section: Introductionmentioning

confidence: 99%

A general framework for evaluating electrode erosion under repetitive high current, high energy transient arcs

Han¹,

Wu²,

Ouyang³

et al. 2019

J. Phys. D: Appl. Phys.

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Electrode erosion is a harmful phenomenon in applications where thermal plasma appears. However, little attention has been paid to establishing a systematic evaluation methology for it. This paper proposed and verified a framework for evaluating electrode erosion under repetitive pulsed discharges. Specifically, erosion can be evaluated from the angles of operating characteristics, macro-morphology, micro-morphology, and chemical compositions. Pilot experiments on W-Ni-Fe and W-Cu electrode erosion were performed and results analysed to verify the validity of this framework. It was found that the erosion behaviours of W-Cu composites were different from those of W-Ni-Fe alloys in many aspects, such as self-breakdown voltage distribution, erosion morphology (microstructures), arc plasma channel compositions, etc. For example, W-Cu electrode surface was split by long cracks with ~50 µm depth to 200-400 µm polygons, while W-Ni-Fe electrode surface was filled by pits and protrusions with a typical diameter of ~20 µm. Finally, factors leading to those differences were analysed and causal relationships discussed based on the results of this framework.

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Review on gas switches developed for fast linear transformer driver

Cited by 6 publications

References 0 publications

Research and Analysis of Insulating Gas in Unified Test Conditions

Research and Analysis of Insulating Gas in Unified Test Conditions

Research on Characteristics of Copper Foil Three-Electrode Planar Spark Gap High Voltage Switch Integrated with EFI

A general framework for evaluating electrode erosion under repetitive high current, high energy transient arcs

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