Control and Monitoring

Fujimoto, Noboru; Koch, H.; Samanta, Pravakar; Sharma, Devki; Zhu, Xiaoxi; Brunke, John; Novev, Michael; Ficheux, Arnaud

doi:10.1002/9781119623632.ch4

Cited by 2 publications

(1 citation statement)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, defects such as conductive particles and burrs inevitably appear inside GISs, which are caused during their manufacturing process, transport, assembly, and long-term operation. Such defects can lead to an internal discharge of its gas [2][3][4]. Existing research on the internal discharge of GIS has been primarily focused on sulfur hexafluoride (SF 6 ) gas discharge generated by ultra-high frequency, ultrasonic, thermal, and optical signals, as well as other phenomena [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Characterization of internal discharge shock waves of gas‐insulated switchgears using shadowgraphy

Jia,

Chu,

Zhao

et al. 2023

IET Generation Trans & Dist

View full text Add to dashboard Cite

The gas‐insulated switchgear (GIS) is a vital component of a power system, and understanding the shock wave characteristics of its internal discharge is crucial to ensure the safe and stable operation of the entire system. In this study, a high‐speed shadowing technique is employed to obtain the shadowgraphs of a typical flow‐field evolution of sulfur hexafluoride (SF6) gas following the breakdown of a pin–plate gap inside a GIS. Experimental data were used to derive parameters, including the Mach number, propagation speed, distance of the discharge shock wave, and the temperature, pressure, density, and velocity of the SF6 gas after wave generation. With a 0.2‐mm discharge gap and 0.4‐MPa pressure, the discharge generates a spherical shock wave, centred at the contact between the discharge channel and electrodes, that propagates in all directions. The shock wave gradually weakens after 20 μs, propagating at near‐sonic speed, and its Mach number decreases from 2.92 to 1.15; similarly, its post‐wave parameters sharply decrease during the first 20 μs. Additionally, a significant reflection occurs when the shock wave propagates to the metal wall. The authors’ findings provide a valuable reference for detecting and diagnosing the internal discharge in GISs.

show abstract