Global Research and Technology

Whitehall Township, PA, United States

Global Research and Technology

Whitehall Township, PA, United States

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Narayanan V.R.T.,University of Minnesota | Heberlein J.V.R.,University of Minnesota | Ruempler C.,Global Research and Technology
Proceedings of the 59th IEEE Holm Conference on Electrical Contacts, HOLM 2013 | Year: 2013

The effects of metallic and plastic vapors on dielectric breakdown strength at atmospheric pressure after current-zero for low-voltage circuit breaker (LVCB) applications have been investigated. Dielectric breakdown is characterized by a positive value of net ionization coefficient, which is the difference between ionization and attachment coefficients. In this paper, preliminary results are presented for the case where the metallic electrode is composed of copper while the ablating plastic wall material is polyamide 6/6 (PA-66). The effects of vibrationally-excited diatomic species and electronically-excited monatomic species on breakdown strength are also presented. The excited species are observed to lower the breakdown strength. It is expected that the current approach will provide quantitative comparisons between different metallic and plastic vapor combinations observed in realistic LVCBs and the numerical results will subsequently be utilized for comparisons with available experimental data. This approach is the first step towards addressing realistic nonequilibrium conditions prevailing in an LVCB after current-zero and the results will be a valuable tool for suggesting improvements in dielectric interruption ability of LVCBs. © 2013 IEEE.


Zhou X.,Global Research and Technology | Shea J.J.,Global Research and Technology | Pahl B.,Global Research and Technology
Proceedings of the 59th IEEE Holm Conference on Electrical Contacts, HOLM 2013 | Year: 2013

In this paper, experimental tests have been carried out to collect and analyze Electromagnetic Interference / Radiofrequency Interference (EMI/RFI) generated by variety of industrial equipment and electrical arcs in different settings. The EMI/RFI intensities were measured and compared to those with series arcing present. Test results show that in general, variable frequency drives and power quality products generate strong EMI/RFI at frequencies below 1MHz. In particular, the EMI/RFI upstream of a variable speed motor drive is consistently higher than those induced by other loads. As frequency increases, intensities of these signals tend to decrease due to strong signal attenuation from filters formed by distributed capacitances and inductances, and transmission line effects that become dominant with long cable lengths for the measured circuits. Similar to Arc Fault Circuit Interrupter (AFCI) technology for residential breakers, these results may be used to gain a better understanding of the EMI/RFI characteristics for developing AFCI technology for commercial and industrial applications. © 2013 IEEE.

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