• AIR LOAD BREAK SWITCH DESIGN PARAMETERS 

      Støa-Aanensen, Nina Sasaki (Doctoral thesis at NTNU;2015:252, Doctoral thesis, 2015)
      Current interruption is vital in the power system, as this makes it possible to control the use of different loads, change the grid configuration, and minimize damage when faults occur. This thesis presents a study of ...
    • Arc Voltage Characteristics in Ultrahigh-Pressure Nitrogen Including Supercritical Region 

      Abid, Fahim; Niayesh, Kaveh; Jonsson, Erik; Støa-Aanensen, Nina Sasaki; Runde, Magne (Journal article; Peer reviewed, 2017)
      A supercritical (SC) fluid is formed when both pressure and temperature of a fluid exceed the critical point, where distinct gas and liquid phases no longer exist. SC fluids demonstrate combined properties of gas and liquid, ...
    • Arc Voltage Distribution Measurement in Tube Constricted Ultrahigh-Pressure Nitrogen Arc 

      Abid, Fahim; Niayesh, Kaveh; Støa-Aanensen, Nina Sasaki (Chapter, 2020)
      This work contributes to the fundamental understanding of axial voltage distribution of the arc burning inside polytetrafluoroethylene (PTFE) tube at very high filling pressures of nitrogen. The arc peak current of 85 A ...
    • Current interruption performance of ultrahigh-pressure nitrogen arc 

      Abid, Fahim; Niayesh, Kaveh; Espedal, Camilla; Støa-Aanensen, Nina Sasaki (Peer reviewed; Journal article, 2020)
      In this paper, the influence of gas filling pressure on the current interruption performance of different switch configurations with electric arcs burning in nitrogen has been experimentally investigated. A synthetic circuit ...
    • Effect of Filling Pressure on Post-Arc Gap Recovery of N2 

      Abid, Fahim; Niayesh, Kaveh; Viken, Egil; Støa-Aanensen, Nina Sasaki; Jonsson, Erik; Meyer, Hans Kristian Hygen (Peer reviewed; Journal article, 2020)
      Experimental investigation of the effect of filling pressure on the post-arc dielectric recovery characteristics of nitrogen is reported in this paper. A half-cycle arc current duration of 540 μs followed by a 10 kV pulse ...
    • Effect of SF6-alternative gas on the dielectric breakdown strength in load break switches 

      Helseth, Trygve (Master thesis, 2019)
      Det moderne kraftnettet inneholder stadig fler fornybare energikilder. Dette er svært gunstig for klimaavtrykket til samfunnets elektriske energiforbruk, men det gir også noen nye utfordringer. Overgangen til fornybare ...
    • Nozzle Wear and Pressure Rise in Heating Volume of Self-blast Type Ultra-high Pressure Nitrogen Arc 

      Abid, Fahim; Niayesh, Kaveh; Støa-Aanensen, Nina Sasaki (Journal article; Peer reviewed, 2019)
      This paper reports on experiments with ultra-high pressure nitrogen arcs in a self-blast type switch design. The effect of filling pressure on nozzle mass loss and pressure-rise in the heating volume is investigated. An ...
    • Post-arc Dielectric Recovery Characteristics of Free-burning Ultrahigh-Pressure Nitrogen Arc 

      Abid, Fahim; Niayesh, Kaveh; Støa-Aanensen, Nina Sasaki (Chapter, 2019)
      This work contributes to the fundamental understanding of post-arc dielectric recovery characteristics of free-burning nitrogen arcs as a function of gas filling pressure. Arc peak current of 425 A at a frequency of 925 ...
    • Short-Circuit making of medium voltage load break switches using a grid Connected test circuit 

      Jabs, Philipp; Niayesh, Kaveh; Støa-Aanensen, Nina Sasaki (Chapter, 2018)
      The load break switch is an important component in the distribution grid. Besides its capability to break load currents reliably, it has to be able to make short-circuit currents according to the IEC 62271 standard. In ...
    • Simulations and Measurements of Streamer discharges near Dielectrics 

      Midttun, Sigurd Gard (Master thesis, 2017)
      A novel numerical fluid model for simulating streamer discharges has been tested and utilized with a two-diemnsional triple junction configuration. The triple junction was located at the upper end of a 1 cm dielectric rod, ...
    • Thermal interruption performance of ultrahigh-pressure free-burning nitrogen arc 

      Abid, Fahim; Niayesh, Kaveh; Thimmappa, Shashidhara Basavapura; Espedal, Camilla; Støa-Aanensen, Nina Sasaki (Chapter, 2020)
      In this paper, an experimental investigation of the thermal interruption performance of free-burning nitrogen arcs at 1 bar, 20 bar, and 40 bar filling pressures is reported. This work contributes to the fundamental ...
    • Ultrahigh-Pressure Nitrogen Arcs Burning Inside Cylindrical Tubes 

      Abid, Fahim; Niayesh, Kaveh; Støa-Aanensen, Nina Sasaki (Journal article; Peer reviewed, 2018)
      When the pressure and temperature of a fluid exceed a critical point, the fluid enters into the supercritical (SC) region. In this region, the physical properties are believed to be in favor of a good current interruption ...