Subject: Re EMF-L HARMONICS--TECH AND NONTECH
Date: Mon, 28 Jul 1997 145116 -0500 (CDT)
From: Clas Tegenfeldt <tegen@bemi.se>
To: Multiple recipients of list <emf-l@mail.llion.org>
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At 00:17 1997-07-18 -0500, Riley wrote:
>I realize the conceptual difficulty in understanding how harmonics
>cancel by way of the neutral, which is why I have reverted to saying,
..
>a resultant magnetic field. The confusion lies in that these triplens
>harmonics are not cancelled between the phases as they are with the
>fundamental 50/60 Hz. It is the neutral which overworks to cancel the
>fields.This leads to a buildup of current on the neutral, which may
>overheat.But the neutral is indeed cancelling the magnetic fields.
>This is all very clear and simple to see once one has understood it.
>But use an ammeter to prove it to yourself. Regards to all, Karl Riley
Since energy is non-destroyable and the laws of physics are as they are,
the ampere meter will show zero as long as there are no stray currents
involved.
In practice there are two factors that makes the magnetic fields NOT to
cancel out. First seperation by insulation or air, thus cables and
transmission wires WILL create a magnetic field with the third and
ninth harmonic, as I and Patrick has said before. The second situation
is stray currents, where each harmonic on the neutral will give a
corresponding mangnetic field.
Even though you and I may think this is simple, it is NOT very clear
or simple... [So let us drop this subject publicly.]
Clas Tegenfeldt ,,,
(o o)
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