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Re: [TCML] GE Protective Capacitors - Part # 9L18DCL101 or 18L0009WH


"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 AM
Subject: Re: [TCML] GE Protective Capacitors - Part # 9L18DCL101 or 18L0009WH

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 ballast
and 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
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.

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" <
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Sunday, May 13, 2018 8:50 PM
Subject: Re: [TCML] GE Protective Capacitors - Part # 9L18DCL101 or


How were you series'ing these for use in your system? Floating the case of
one 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 the
amazing suitability that I have found of some certain GE Dielektrol
protective capacitors to be for coiling. These have been showing up on
fairly frequently as of late and are rated at 0.25 uFd @ 13,800 V(AC).



This appears to be the best current 'deals' on these units at this time.
The original units (now discontinued from production) were PN -
and the updated ones are PN - 18L0009WH. Due to a GREAT eBay "deal" on
three 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 C
just over 0.13 uFd) as the main primary circuit capacitor for my ARSG
driven, 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 no
discernable 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 the
ferromagnetic 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 that
internal dielectric heating due to excessive dissipational losses that is
felt on the outer casing of the capacitor unit takes a considerable
of time to fade after shutdown. Depending upon the internal thermal mass
the capcitor, this cool down can literally take hours! Even though they
'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% of
their combined 100% duty cycle nameplate rating and usually notably less
than 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 line
voltage peaks. From what I have been able to determine online, they are
constructed with a PP based "Hazy Film" dielectric system and extended
foil connections and like most of their medium voltage PFC cousins, they
have internal discharge resistors to safely bleed off any residual HV
charge from the capacitor to the 'safe to handle' range within <10
after 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
to 'bite you' even after the terminals are shorted out with a hot-stick, due to dielectric memory, yet their resistance level is still high enough
that their extra load across the cap's terminal is totally
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,
from a mechanical as well as an electrical standpoint. So, if you happen
have spotted these particular caps and are apprehensive about taking the
leap, I can personally attest from a coiling standpoint that "the water
fine". ;^)

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