300 kV from bipolar setup and the difference between (+) and (-) corona

Update 09.2019: I have conducted the direct measurements and turns out that the voltage here actually was about 298 kV! The discrepancy in the spark length probably is caused by the different air humidity: in winter the humidity here is 20% and single multiplier can create 31 cm spark (I haven't tested bipolar system in winter), while in summer the humidity is 55% and the spark length reduces to 28 cm for single mutiplier and is 56 cm for bipolar system.

Upd 04.2021: I think there's no point in keeping the title "275 kV (actually 298 kV)...", it's too cumbersome. I'm changing it to be just "300 kV" as that is about what I've measured with a voltage divider (let's say with a +-5 kV error). So, for new viewers, that's why in the video I state 275 kV, and the title now says 300 kV. 275 kV was an estimate using spark length, and 300 kV is a more accurately measured value.

Original description:
In this video you can find the display of spark and corona discharges occuring at 275kV DC and the display of the differences between positive and negative corona discharges. Enjoy!

Видео 300 kV from bipolar setup and the difference between (+) and (-) corona канала Vidduley