There may very well be substance behind this pedestrian formulation. Reducing the near surface charge density and a homogeneous charge distribution greatly benefit signal transfer quality in all parts, including cables.
Its a good thing that electrons know that they are doing RF and not audio and therefore don't do anything strange in the radio world then. Any insulation effects beyond linear losses at RF would be very obvious
You claim insulation changes surface charge density?
Do you have any proof of this nonsense or is it just something you pulled out of the blue for no reason?
And quoting this non-fact can not "justify" the "advantage" you claim.
The polarization of an insulator (dielectric) does indeed change the surface charge density in the conductor, learn your electrostatics!! (Not that N101N makes much sense of course)
To be precise the surface charge density in the conductor changes to cancel the polarized material's surface charge due to the bulk polarization, given a fixed voltage (and thus electric field strength).
To be precise the surface charge density in the conductor changes to cancel the polarized material's surface charge due to the bulk polarization, given a fixed voltage (and thus electric field strength).
When a piece of dielectric is polarized in an electric field, charge is displaced on every atom a tiny amount, which leaves a net charge on the ends of the material. Everything is chock full of positive and negative charges, all balanced out until an external field acts on it...
In fact insulators commonly have stray electrostatic charges on the surface picked up from contact and friction and the environment, above and beyond polarization effects. Conductors can only have net charge at the surface, and only such that the electric field is always perpendicular to the surface(*) - insulators have no such restrictions, they can have embedded charges, surface charges, and also the polarization charges resulting from external fields.
Normally we only count net charge and ignore every neutral atom, but polarization is one of the things that requires consideration of how charges are arranged in space within a material.
Some materials are spontaneously polarized due to the crystal structure, others are deliberately polarized by embedding charges (which then form a field that creates permanent polarization), These are called electrets.
(*) if this isn't the case, a current immediately flows to restore this condition, basically keeping the interior of the conductor free of electric field. In electrostatics we assume steady-state has been reached.
In fact insulators commonly have stray electrostatic charges on the surface picked up from contact and friction and the environment, above and beyond polarization effects. Conductors can only have net charge at the surface, and only such that the electric field is always perpendicular to the surface(*) - insulators have no such restrictions, they can have embedded charges, surface charges, and also the polarization charges resulting from external fields.
Normally we only count net charge and ignore every neutral atom, but polarization is one of the things that requires consideration of how charges are arranged in space within a material.
Some materials are spontaneously polarized due to the crystal structure, others are deliberately polarized by embedding charges (which then form a field that creates permanent polarization), These are called electrets.
(*) if this isn't the case, a current immediately flows to restore this condition, basically keeping the interior of the conductor free of electric field. In electrostatics we assume steady-state has been reached.
Please name the manufacturer, curious did you A/B against other non carbon/graphite cables?
JMFahey,
Just because you don`t know or don`t understand something does not mean that it does not exist. Try to strengthen your awareness and ability to decide what is nonsense and what is not.
Mark Tillotson,
Magnetism not electrostatics. I said that the dielectric layer reduces the surface charge density in the conductor so what exactly is the problem?
To be more precise, due to the presence of the oppositely polarized insulator, magnetic field strength (conduction) will be decreased thereby electric field strength will be increased and distortion will be decreased (at any applied voltage).
Just because you don`t know or don`t understand something does not mean that it does not exist. Try to strengthen your awareness and ability to decide what is nonsense and what is not.
Mark Tillotson,
Magnetism not electrostatics. I said that the dielectric layer reduces the surface charge density in the conductor so what exactly is the problem?
To be more precise, due to the presence of the oppositely polarized insulator, magnetic field strength (conduction) will be decreased thereby electric field strength will be increased and distortion will be decreased (at any applied voltage).
I was commenting on JMFahey's point, which contradicted you...
So you claim the dielectric effect on the surface of the conductor changes the magnetic properies? How can it, the current is the same...
So you claim the dielectric effect on the surface of the conductor changes the magnetic properies? How can it, the current is the same...
Piling more nonsense over the original one won´t make it truer, just will make the nonsense pile higher.
cbdb,
you are right, good insulators do not store excitable charges, however, although I don`t know anything specific about the Van den Hul cable, I think that the layer in question is not a "real" dielectric layer, it just has somewhat higher resistivity than copper.
JMFahey,
that whatever layer reduces the surface charge density (skin effect).
In the same system, as kinetic energy decreases, potential energy increases.
Many years ago cars used carbon high voltage leads.
It was like a carbon string inside the insulator.
It was like a carbon string inside the insulator.
As I noted above, per their own old website, Van den Hul's LSC is comprised of 5.5 micron carbon fibre strands insulated with an unspecified 0.25 micron layer. They don't use it as a dielectric, they use it as a conductor, either by itself or as an addition.