Conveners
5.5 Insulation and Dielectric Breakdown I
- Jacob Stephens (MIT)
Natural and synthetic ester liquids offer numerous benefits when compared with conventional naphthenic oils, such as improved biodegradability, low toxicity, high flash and fire points and increased ability to accommodate moisture. It is for these reasons that the power and pulsed power industries are adopting ester liquids as a long term replacement for naphthenic oils. One barrier to the...
An investigation into the breakdown characteristics of a dielectric-coated wire-plane electrode system in atmospheric air is presented. Simulating the scenario in which standard utility wiring in close proximity to a grounded conductor is excited by a lightning strike, the wire is insulated while the plane electrode is a bare metal surface. At sufficiently high fields, greater than ~30 kV/cm,...
The prevention of electrical discharges is a classic problem in the design of electrical equipment, which is only becoming more important with the evolution of various technologies (electrification of airliners, increased voltage levels in various other applications). While the physics of discharge development is well described by Paschen’s Law for the case of a gas gap between planar...
Sulphur Hexafluoride (SF$_{6}$) is an insulating gas which is used in high-voltage circuit breakers due to its unique insulating properties. However, it is an extremely potent greenhouse gas with a global warming potential (GWP) of 23900! Also, it produces toxic byproducts during electrical arcing. Hence, environment friendly and easier to handle alternative insulating gases are being...
In recent years, alternative insulating gas of SF6 becomes a research hotspot in electric power system. The insulation performance of C4F7N is 2.2 times more than that of SF6, and its global warming potential is low. Its mixture gas with CO2 has the potential to replace SF6 gas. As a medium for gas-insulated equipment, it is of great engineering significance to study the surface flashover...
Arc accidents may cause serious problems in power grid. Yet, the progress of arc evolution is very complicated and rapidly changed, which can be easily disturbed by external factors. Here, in order better describe DC arc mechanism and exclude external influence factors, a testing platform, which can produce a small DC arc in the condition of gap length less than 15mm and current less than...
