Ah, thanks for driving the point home. Will killfile in due course (even if
only a blow-in in just this thread).
"I've got more trophies than Wayne Gretsky and the Pope combined!"
- Homer Simpson
Website @ http://webpages.charter.net/dawill/tmoranwms
Bob, Bob, Bob....
It does conduct. I know it conducts because
I've had to clean and repair hardware where
a capacitor burped up electrolyte onto circuitry.
Circuitry that didn't work anymore because the
electrolyte was conducting.
Please stop guessing.
Geee. I would take a few brain cells to conclude your cap was defective if
it burped. Ya' think that would be cause you have conductive electrolyte?
Maybe the electrolyte was full of carbon after the internal fault?
Go back and take some very basic electronics, or maybe just study some.
Electrolytes are not conductors of electricity in a capacitor.
OK.. let's start at the beginning.
A capacitor is two conductive metal plates separated by an insulating
medium. Now add electrolyte. Did ya' get a resistor? Ever put your ohmmeter
(do I need to explain an ohmmeter also?) across a capacitor? It measures
infinity after charging to the supply voltage because the electrolyte is an
See how that works? That wasn't too hard. Was it? Now try to remember for
next time. Are you an electrician too?
If you want to be insulting, make sure it isn't yourself you are ridiculing.
You truly amaze. This is the second bit of misinformation in just a few
hours. Electrolytes make pretty GOOD conductors. That's probably WHY they
are called electrolytes. Now, sometimes we DON'T want current to flow, so
the **DIELECTRIC** was invented.
In some (all?) electrolytic caps, the dielectric is an oxide layer.. This is
a very thin layer that allows good storage capacity in a smaller physical
size. The conductive electrolyte makes up the negative side of the thing.
How does it feel to know so much and be WRONG about all of it?
The trouble with people is not that they don't know but that they know so
much that ain't so.
It reads infinity because there's an oxide
layer on the anode. Oxide, at least in this
case, is an insulator.
I can play with the big wires or the small wires.
Same electrons either way.
Trying real hard not to...
here's a quote from the Elna capacitor
Aluminum electrolytic capacitors are made by layering the electrolytic
paper between the anode and cathode foils, and then coiling the result.
The process of preparing an electrode facing the etched anode foil
surface is extremely difficult. Therefore, the opposing electrode is
created by filling the structure with an electrolyte. Due to this
process, the electrolyte essentially functions as the cathode. The basic
functional requirements for the electrolyte are as follows:
Chemically stable when it comes in contact with materials used in the
anode, cathode, and electrolytic paper.
Easily wets the surfaces of the electrode.
Has the chemical ability to protect the anode oxide thin film and
compensate for any weaknesses therein.
Low volatility even at high temperatures.
Long-term stability and characteristics that take into consideration
such things as toxicity.
Take a look at #4, Bob. It says that
electrolyte is electrically conductive.
SOME leaking electrolytes are corrosive when "in the wild".
When electrolytic caps short is is due to "thorns" growing on the
plates and punching through, shorting the plates together. Then they
heat up and blow.
When they go, they often take out other components around them.
That failure mechanism is NOT one I have heard of for Electrolytics
before. Mind you its a long time since I studied the internal behaviour
of components in detail.
Is it even possible to redeposit metallic Aluminium by electrolysis from
an aqueous solution?
I strongly suspect you are confusing it with the common failure
mechanism for NiCd cells.
Electrolytics commonly develop a reduced capacitance, increased leakage
current and a higher ESR (effective series resistance) then heat up and
vent or blow due to internal gas or even steam pressure. Exactly what
is going on during this process, I dont know in detail, but I've
replaced enough of them to be VERY familiar with the results :-)
The historical aspect of this just HAS to be remembered.
================================================Only metric prefixes for 10+6 or more have an upper-case abbreviation (e.g.,
M = 10+6, G = 10+9, etc.). In particular, note that the prefix m indicates
10-3 and M indicates 10+6. The difference between an upper-case M and a
lower-case m is nine orders of magnitude! One should be warned that American
manufacturers of capacitors often use "mF" or "MF" to indicate microfarads,
a practice that is both incorrect and misleading.
No, those are DC electrolytic filter caps which do not contain PCB. The
three oil filled AC paper caps in the picture behind the bank of blue
electros would be prime contenders for PCB, but unlikely if manufactured
Yes, definitly "Reactionay" in that you had NO Knowledge of the
transformer in question, and when others explained that ALL these
used in a FerroUPS, are DRY transformers, you still insist telling the
world, your prepositioned agenda. Actually, some of US do know exactly
what transformer the OP has, and what type it is, and that it doesn't
have anything to do with PCB's. Now, do you know what PCB stands for,
or is this another area that you knowledge base doesn't cover?
Nope. The chemicals were there to facilitate heat transfer,
especially in larger grid transformers. Needless to say,
non-conductive liquids with a high boiling point are required for the
Characteristics and Uses of PCBs
PCBs belong to a family of organic compounds known as chlorinated
hydrocarbons. Key characteristics include: high boiling point, high
degree of chemical stability, low flammability, and low electric
conductivity. Between 1926-29 and 1977, PCB-containing products were
manufactured for use in applications where stable, fire-resistant,
heat-transfer properties were demanded. The most extensive use of PCBs
occurred in dielectric fluids. Such fluids typically have the
following characteristics: a heavy oil appearance, high boiling point,
high chemical stability, high flash point, low electrical
conductivity, and low water solubility. PCBs were also used as
plasticizers and additives in lubricating and cutting fluids. Most
PCBs were sold for use as dielectric fluids (insulating liquids) in
electric transformers and capacitors. Other uses included heat
transfer fluid, hydraulic fluid, dye carriers in carbonless copy
paper, plasticizers in paints, adhesives, and caulking compounds, and
filters in investment casting wax. Although PCBs are no longer
commercially made in the United States, many electric transformers and
capacitors once filled with PCBs are still in service. Additionally,
PCBs currently are being inadvertently produced as byproducts during
the manufacture of certain organic chemicals. PCB Manufacturers and
Trade Names lists some of the manufacturers, who made PCBs and the
trade names of their products.
Why Are PCBs Harmful to Human Health and the Environment
When released into the environment, PCBs do not easily break apart and
form new chemical arrangements (i.e., they are not readily
biodegradable). Instead they persist for many years, bioaccumulate,
and bioconcentrate in organisms. Well documented tests on laboratory
animals show that various levels of PCBs cause reproductive effects,
gastric disorders, skin lesions, and cancerous tumors. Exposure to
PCBs in humans can cause chloracne (a painful, disfiguring skin
ailment), liver damage, nausea, dizziness, eye irritation, and
You may consider it a "minor ailment", but have you seen the photos of
that Ruskie politician who was purportedly poisoned with dioxin? A
year ago he looked about like baby faced John Edwards, now he looks
more like a puffy faced, acne ridden Andy Rooney...
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