There is an atmospheric pressure load (coaxial cylinder and copper wire as main electrode) which high voltage pulses by a Linear transformer driver (LTD) has been released to it. I think a kind of corona discharge will happen in atmospheric load after applying high voltage pulses. Discharge is happening after breakdown by high potential electrode. Question: Why if we release two continuous voltage pulse (50ns, 15kV pulse and then after 100ns another 50ns, 15kV pulse), The peak of discharge current in the first pulse is almost twice than 2nd one? and if we increase the distance between pulses like as (50ns, 15kV pulse then after 1ms another 50ns, 15kV) the peak of discharge current in two pulses are same as each other. Can anyone explain the relation between time and discharge current in this kind of discharge?Why when distance between pulses are far, the discharge currents have same peak?
Just a guess, but could there be a build up of ions in the air app that might resist further current flow by exerting a space potential? Increasing the time between pulses would allow the ions to disperse.
Dear Reza Rebk, It seems that your question is somehow connected to mine (please see the attached link).
The condition for the occurrence of partial discharge (PD) is commonly associated to the increase of the local electric field up to exceed a critical value. In general, nothing is mentioned about the availability of electric charges as complementary condition for PD occurrence.
In your case it may occur that the conditions of charges are the same when you have enough long time between pulses. When you apply one pulse very close to the other in time, the second one will find a different condition as electric charges are concerned.
https://www.researchgate.net/post/Is_there_any_real_condition_where_the_local_critical_E_field_is_exceeded_but_Partial_Discharge_does_not_occur_due_to_the_lack_of_electric_charges
In principle air circulation should make a difference by moving ions away but in practice I suspect that the air would not move far enough in 50 ns to make much difference.
Thanks all for participating in this question. Now my next question: How mathematically can I explain this topic. What I need are, Calculating E as electric field, amount of remaining charges, and relation for weakness of electric field and radius (get far, weaker electric field).
I have added my load drawing. Copper wire length is 32 cm.
Examples, hints, sources are welcome!
Any idea about calculating charges before and after ionization process. As I have found there is a ionization area after breakdown (corona discharge) Any idea to compare amount of charges inside this region with amount of charges before ionization? Regards
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