Tedd,"BIL" stands for Basic Impulse Level. This is like a 50 microsecond or less fast rise pulse of the high amplitude voltage rating that the devise is suppose to be able to withstand without sustaining damage. This extra robusticity renders the devise more immune to lightning strikes or huge witching surges that the entire power line infrastructure and its associated components would surely be vulnerable to.
David Rieben----- Original Message ----- From: "Tedd Dillard" <tedd.dillard@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> Sent: Monday, May 14, 2018 8:43 AMSubject: Re: [TCML] GE Protective Capacitors - Part # 9L18DCL101 or 18L0009WH
Gentlemen,I am working on a coil that seems to be very close to what David has. It is based on a 10 kva pole transformer. I have built a current limiting ballastand have ganged varics so I can control current to around 40 amps an voltage up to 280. I am in the thinking phase for a SRSG and the tank capacitor. I have 3 capacitors like the ones in this discussion. They are way too high capacitance at 14 microfa. But I have questions about them for education on my part. They are rated at 7.2 kv but there is also a rating of 95 kv "bil". Can anyone tell me what the "bil" means? Also if I understand the post recently the two capacitors that David has in series is, .25 microfa. each for a total of .125 microf. That would be 125 nanof. Teddy On May 14, 2018 8:53 AM, "David Rieben" <drieben@xxxxxxx> wrote:Oops, I fogot. the porimary voltage is from a 14.4 kV pig. ----- Original Message ----- From: "Andrew Cobaugh" < andrew.cobaugh@xxxxxxxxx> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> Sent: Sunday, May 13, 2018 8:50 PM Subject: Re: [TCML] GE Protective Capacitors - Part # 9L18DCL101 or 18L0009WH David,How were you series'ing these for use in your system? Floating the case ofone of them, or did you happen upon the dual bushing version? Also, what is the primary voltage on your system? On Sun, May 13, 2018 at 5:33 PM, David Rieben <drieben@xxxxxxx> wrote: Hi all,I was just wanting to pass on to the rest of the TCML big SG coilers theamazing suitability that I have found of some certain GE Dielektrol protective capacitors to be for coiling. These have been showing up on eBay fairly frequently as of late and are rated at 0.25 uFd @ 13,800 V(AC). https://www.ebay.com/itm/GE-Capacitor-with-Dielektrol-9L18DCL101-13-8KV/ 171955634804?_trkparms=aid%3D777001%26algo%3DDISCO.FEED% 26ao%3D1%26asc%3D50963%26meid%3Dfcbee251c09a4671967201c022e0 0f6c%26pid%3D100651%26rk%3D1%26rkt%3D1%26%26itm%3D171955634804&_trksid= p2481888.c100651.m4497&_trkparms=pageci%3A4e91f1f4- 56ef-11e8-bfd1-74dbd1800d55%7Cparentrq%3A5b4518781630a9c10cbe75cafff4 bdba%7Ciid%3A1 https://www.ebay.com/itm/GE-General-Electric-Capacitor- with-Dielektrol-Fluid-18L0009WH-13-800V/273049284524?_trkparms=aid% 3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D50963%26meid% 3D90ee9bc9263f44fe9a830e47dd8b0680%26pid%3D100675%26rk%3D1% 26rkt%3D15%26sd%3D382430499481%26itm%3D273049284524&_trksid= p2481888.c100675.m4236&_trkparms=pageci%3A4e91f1f4- 56ef-11e8-bfd1-74dbd1800d55%7Cparentrq%3A5b4518781630a9c10cbe75cafff4 bdba%7Ciid%3A1This appears to be the best current 'deals' on these units at this time.The original units (now discontinued from production) were PN - 9L18DCL101 and the updated ones are PN - 18L0009WH. Due to a GREAT eBay "deal" onthree of these last year, I decided to try a pair of these (the original 9L18DCL101 units) in series (for 0.125 uFd @ 27,600 VAC - but measured Cis just over 0.13 uFd) as the main primary circuit capacitor for my ARSGdriven, big pole pig coil. Once the primary coil was properly retuned for the larger C than my original measured 0.113 uFd Maxwell pulse cap unit,these worked quite beautifully in my coil! There appears to be nodiscernable heating above ambient temperature of thier guts, although the outer casing that is in closest proximity to the primary coil will get a bit warm after an extended run, obviously due to magnetic heating of theferromagnetic outer casing, not losses of the internal dielectric system. I say this due to the fact that the discernab le warmth of the outer casing completely disappears within a couple of minutes following shutdown. From previous experience, I have found thatinternal dielectric heating due to excessive dissipational losses that isfelt on the outer casing of the capacitor unit takes a considerable amountof time to fade after shutdown. Depending upon the internal thermal massof the capcitor, this cool down can literally take hours! Even though they are'used', I figure that I am actually running them at a pretty 'low stress'level, pushing only an absolute maximum of 16.8 kVAC RMS (about 60% oftheir combined 100% duty cycle nameplate rating and usually notably lessthan this).It appears that these caps were designed to be used in combination with a distribution surge arrestor to protect the windings of LARGE motors (that run on a nominal input line voltage up to 13,800 volts!) from sharp linevoltage peaks. From what I have been able to determine online, they are constructed with a PP based "Hazy Film" dielectric system and extended endfoil connections and like most of their medium voltage PFC cousins, theyhave internal discharge resistors to safely bleed off any residual HV charge from the capacitor to the 'safe to handle' range within <10 minutesafter the circuit is de-energized. This is a nice feauture in my opinion,as it 'defangs the snake' of hidden residual charge that can creep back upto 'bite you' even after the terminals are shorted out with a hot-stick, due to dielectric memory, yet their resistance level is still high enoughthat their extra load across the cap's terminal is totally inconsequential to the coil's performance within the milliseconds time frame of the charge/discharge cycling in a Tesla coil primary circuit. All in all, these units appear to be constructed quite robustly, too, bothfrom a mechanical as well as an electrical standpoint. So, if you happentohave spotted these particular caps and are apprehensive about taking theleap, I can personally attest from a coiling standpoint that "the water is fine". ;^) David _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla-- andy _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxxhttps://www.pupman.com/mailman/listinfo/tesla
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