Dielectric Properties of Cryogenic Gas Mixtures Containing Helium, Neon, and Hydrogen

Electron Swarm Parameters and Dielectric Properties of the Superconducting Binary Mixtures of He-H2

“…In addition, the value of critical breakdown electric field Ecrt. for 94/5 He-H2 mixture equal to 9.87 x 10 4 V/cm, were in good agreement within the range of experimental breakdown voltage values of (Peter Cheetham et al, 2016;L Graber et al, 2015;Park et al, 2016). While, the real value of breakdown voltage of a mixture include secondary electron emission coefficient , according to relation known as the Townsend breakdown criterion (Küchler, 2017), this value is not taken into account by theoretical study using two-term approximation solution of Boltzmann equation analysis.…”

“…maritime application, domestic energy, electricity generation and gas used in superconductor application (Berg, Palmer, Miller, Husband, & Dodds, 2015Ellappan Mohan, 2021). temperature superconducting HTS power applications, in which reduced asphyxiation hazard and wider operation temperature range (S Pamidi, Kim, & Graber, 2015, Nandagopal, Dr.V., Maheswari 2016. It is preferable to use (GHe) as a cryogen because of it's lower dielectric strength compared to that of liquid nitrogen (LN2), which limits the applicability of (GHe) to low voltage power devices (Rodrigo, Kwag, Graber, Trociewitz, & Pamidi, 2013;Shin, Hwang, Seong, Lee, & Lee, 2012).…”

“…It is preferable to use (GHe) as a cryogen because of it's lower dielectric strength compared to that of liquid nitrogen (LN2), which limits the applicability of (GHe) to low voltage power devices (Rodrigo, Kwag, Graber, Trociewitz, & Pamidi, 2013;Shin, Hwang, Seong, Lee, & Lee, 2012). At cryogenic temperatures the dielectric strength of pure (GHe) lower than that of hydrogen gas, (L Graber et al, 2015, Dr.Mohammad, M. Othman. 2021 show a small mole fraction of H2 in He-H2 mixture increase ac breakdown voltage compared to pure GHe.…”

“…Most of the leaflet on dielectric strength is related to He and its potential replacements. Experimental and theoretical studies of swarm parameters and electric field strength at cryogenic temperature (HTS) have previously been published, for example, (Fitzpatrick, Kephartl, & Golda, 2007, Dr.Idris Hadi Salih, 2020) study the characterization of GHe for naval application of HTS, (L Graber et al, 2015) measured the dielectric properties of two binary cryogenic gas mixture of He-H2 and He-Ne, containing 4mol% hydrogen and 4 mol% Ne, respectively at temperature of 77 K over the gas pressure 0.5-2 MPa, (Park et al, 2016) studied the breakdown voltage and its application for binary He-H2 cryogenic gas mixtures, (Peter Cheetham et al, 2016) investigated the dielectric strength binary He-H2 cryogenic mixture both in ac and dc by increasing small mole fraction of hydrogen gas, (P Cheetham, Park, Kim, Graber, & Pamidi, 2017) studied the dielectric properties of He-H2 cryogenic gas mixtures for superconducting power application, (Park, Pamidi, & Graber, 2017;A. Devaraju, 2020;Qaysar S. Mahdi 2018) studied the dielectric properties of He-H2 cryogenic gas mixtures using Langmuir probe.…”

Study on the Effect of Helium on the Dielectric Strength of Medium-Voltage Vacuum Interrupters

“…Anticipated current and future research directions related to the application of gas mixtures (also containing helium) in switchgear are presented in Table 2. Mixtures using helium have been the subject of a number of different studies over the years, but they have been for high pressures or other energy industries [25][26][27]. The design of gas insulating systems with electronegative properties should take into account the electron swarm parameters of the gases, such as the electron attachment and electronscattering cross-sections.…”