As you already know, I am working on a thesis concerning self-blast circuit-breakers.
Hopefully, the lab-and-testing part of the thesis now lies behind me. I have acquired quite a lot of data and what I have to do now is to find out what this data can tell us about the processes in a self-blast circuit-breaker at current zero.
After the mobile phone disaster the rest of the testing went quite well. The last part was a bit more strenuous because I changed the insulation gas from CO2 to SF6. SF6 is a gas with very good insulation properties but also a greenhouse gas (22000 times the global warming potential of CO2) and the chemical byproducts produced when it is exposed to arcs are somewhat unhealthy. Therefore it needs to be handled with care. For the climatic part there is a filter and a tank so the gas can be reused several times. For the health part, we use this:
Looks good, isn’t it?
It’s rather cool to work with dangerous stuff. Makes work more thrilling. And it kind of compensates for the uncoolness of a lab in the basement which nobody (except the people who need and use it) ever enters.