Subject:  Re (H,T) Transients, explanation
Date:     Wed, 30 Jul 1997 043640 -0500 (CDT)
From:     Clas Tegenfeldt <tegen@bemi.se>
To:       Multiple recipients of list <emf-l@mail.llion.org>
--------------------------------------------------

At 14:53 1997-07-29 -0500, Drasko wrote:
>issue, so I hope somebody from the List would respond to this, explaining
>the TRANSIENTS issue in several sentences.

A transient is a short and fast transition from one state to another, and
often
back again. Most transients on our power system is due to switching on or
off
various power loads (devices). Since the transient is very fast it also
contains
high frequency components, if you have read about Fourier analysis you know
that
a dirac pulse contains all frequencies (in reality ideal dirac pulses do not
exist).
Also, the transients may contain quite a lot of energy, and that may well be
the
clue to their importance. The fields from the transients may be shortlived
and
not repeated that often, but the may carry enough energy to make an inpact
on
living things, we don't now yet.

The Hydro-Quebec study indicated transients as an important factor to look
at,
but their way of measuring them has been critized. Exactly how do one
proceed
to measure transients? No easy task at all.

Clas Tegenfeldt       ,,,
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