Randy,
Found one reference to the development of "Lectronol", dated 1945.
It states that Lectronol caps are twice as good as mineral oil filled
caps. Therefore, unless they are using castor oil, I'd bet that these
are some sort of PCB filled caps.
Their specs are excellent for TC work, though the voltage and
capacitance are a bit low. I'd bet that they would withstand voltages
up to their rated nameplate values, and come back for more.
If you already own them, and they are not leaking, then I'd go ahead
and try them for TC work. You could even try using the water cooling,
if they seem to get hot.
If you don't own them, I'd steer clear of them. Disposal of a PCB
filled cap down the road can become a major and costly headache.
Abstract of 1945 article follows below. Full article costs $36.00,
unless you are an IEEE member. Perhaps one of the other list members
can access the full article for confirmation.
Dave
http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5059041&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D5059041
======================================================
Increased military production has accelerated the application of
high-frequency heating where accurate control of temperature for short
intervals is fundamentally important. The heating of metals by
induction has been widely applied. The present paper describes the
development of a new type of dielectric liquid called Lectronol.
Capacitors containing this liquid are particularly well adapted for
use in the tank circuit of electronic heaters used in induction
heating. The capacitor is water-cooled and is housed in a hermetically
sealed completely filled nonmagnetic container so constructed as to
provide sufficient flexibility to take care of the liquid expansion
due to thermal changes. The capacitor is noteworthy because of the
absence of cellulose sheet insulation, satisfactory operation being
entirely dependent on the superior insulating properties of the
Lectronol. Capacitors containing this liquid are characterized by low
dielectric loss and high dielectric strength over the frequency range
utilized in power oscillators. The capacity per unit volume is
approximately twice that obtained with mineral oil. The electrical
characteristics of the capacitor are stable under severe conditions of
use.
======================================================
On 11/24/2012 3:29 PM, Randy Burk wrote:
I have 3 Westinghouse water-cooled caps in aluminum housings. They are
rated
at 7800V, 240 Amps, Freq 540 KC, .0076 mf. They contain lectronol as
the
dielectric.
Are these suited for TC service? What is lectronol and is it hazardous?
Randy
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