reply in body of message ----- Original Message ----- From: "Wagner Lipnharski" To: Sent: Tuesday, January 07, 2003 12:09 PM Subject: Re: [EE]:Flashover voltage in Air? > > ----- Original Message ----- > > From: > > To: > > Sent: Monday, January 06, 2003 9:41 PM > > Subject: [EE]:Flashover voltage in Air? > > > > > Does anybody know the flashover voltage in air? > > say KV per cm? Cant find a solid figure on the web > > just "adjust sparkgap until flashover" and that > > doesnt really help me. > > > > TIA > > > > JJ > > Dear Jonathan, can you answer the following questions? some... > > 1) Air Temperature 15 degrees C > 2) Air Humidity 0-60% > 3) Air Pressure (barometric) ???? average > 4) Altitude relative to the sea level sea level > 5) Air Ionic charge ?????? > 6) Eletrodes material and shape copper or stainless steel > 7) Ionic Charge ramp map ??????10-20mS 100mS > 8) Wind present? if yes, what speed no > 9) Others that for sure I forgot... So I think that the higher the airpressure the higher the air density and thus the shorter the gap?, the higher the humidity the smaller the gap?, the higher the rate of charge the shorter the gap? the lower the altitude and thus higher air density the lower the gap? temp>=gap > Once you have those answers, it is easier to calculate the sparkgap, but > until you don't, use 1kV/mm for most cases (250C, RH:60%, xxx, 200m, xxx, > copper needles, 100ms charge, no wind,... thanks for the info Wagner -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu