Relationship between electrode surface roughness and impulse breakdown voltage in vacuum gap of Cu and Cu-Cr electrodes

Adv. Technol. R&D Center, Mitsubishi Electr. Corp., Hyogo, Japan
IEEE Transactions on Dielectrics and Electrical Insulation (Impact Factor: 1.36). 09/2003; DOI: 10.1109/TDEI.2003.1219640
Source: IEEE Xplore

ABSTRACT The relationship between the impulse breakdown voltage of vacuum gaps and electrode surface roughness was investigated for the purpose of controlling the surface roughness on HV conductors. The roughness of mechanically polished Cu and Cu-Cr electrodes was measured with a roughness meter, and the relationship between the breakdown voltage and surface roughness was obtained for plate-to-plate gaps. The discharge-conditioning effect increased with reduction in the surface roughness. The breakdown voltage depended not only on the roughness of the cathode but also on the anode surfaces. Reducing the surface roughness was found not to be an effective way to increase the breakdown voltage for non-uniform field gaps after discharge conditioning.

  • [Show abstract] [Hide abstract]
    ABSTRACT: Breakdown (BD) characteristics in vacuum are strongly dependent on the electrode surface conditions, such as surface roughness. However, there is little known concerning the details of the relationship between the surface roughness and BD conditioning effect. In practical application, it is important to clarify how the surface roughness affects the breakdown conditioning characteristics, especially for the non-uniform field configuration. This paper discusses the effect of surface roughness on breakdown conditioning characteristics under non-uniform electric field in vacuum under applications of negative standard lightning impulse voltage. For this purpose, we examined the BD conditioning of a rod-to-plane electrode made of SUS304 and Cu-Cr. The surface roughness of R<sub>a</sub> is controlled from 0.3 to 2.5 mum. Experimental results revealed that the enhancement of surface roughness of electrodes increases the number of BD to complete the conditioning effect. We explained the results from the observed results of the electrode surface. Consequently, we could clarify the effect of surface roughness on the conditioning effect under non-uniform electric field in vacuum quantitatively.
    IEEE Transactions on Dielectrics and Electrical Insulation 07/2007; · 1.36 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: When two-electrode spark gap switches are applied to main discharging circuit of pulsed power conditioning system, trigger generators will be needed. To guarantee triggering reliability and protect other key components in the pulsed power conditioning system, such as pre-ionization branch and xenon lamp, magnetic switch is needed to insulate the high triggering voltage in the main discharging circuit. In this paper, starting from the analysis of the working principle of the discharging circuit, we present the solution of Fe-based nanocrystalline alloy switch. Specifically, we provide the basis of theoretical calculation and the method of material selection for the design and realization of this magnetic switch. Via the performance tests in pulsed power conditioning system, the validity of material selection and parameter design is proved. This paper provides a reference for the engineering design and application of magnetic switches in huge pulsed power systems.
    IEEE Transactions on Dielectrics and Electrical Insulation 01/2011; 18(4):1143-1150. · 1.36 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Field emitter arrays (FEA's) consist of micrometer-sized sites on a surface in vacuum designed to drive the field emission of electrons. Large arrays of these devices are envisioned for applications in video displays and x-ray generation. Research in this area is relevant for studies in field emission and breakdown on contacts in vacuum and vacuum interrupters, particularly for the application of vacuum interrupters to high-voltage (HV) electrical systems. The detailed knowledge of the actual surface structure and conditions in FEA's can exceed what is feasible for macroscopic contacts, giving the opportunity for more detailed comparison of field emission/breakdown theories to experiments. The first part of this work examines the applicability of FEA research to macroscopic contacts in vacuum. The second part compares the field enhancement factor, emission area, non-uniformity of emission sites, and influence of particles between these two arrangements.
    Discharges and Electrical Insulation in Vacuum (ISDEIV), 2012 25th International Symposium on; 01/2012