Re: Chokes vs Safety Gaps

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br> 

Tesla list wrote:
 >
 > Original poster: "Malcolm Watts" <m.j.watts-at-massey.ac.nz>
,
 > RLC? That is exactly what I tried to do about 8 years ago. I
 > constructed a balanced-about-ground multipole filter with a
 > Butterworth characteristic based on the macro component values that
 > apparently counted and killed a NST in less than a minute (the only
 > one I ever lost incidentally).

What did you consider as loads, or terminations, for the filter?
These filters require resistive terminations at both sides with
correct values for proper behavior. With low damping they will
resonate.

As the objective is to protect the transformer from pulses
coming from the spark gap, it's probably possible to consider
the gap as a low impedance source, and the transformer as a
high-impedance load, and design a filter between these, that
obviously must include resistors, that make the role of the
terminations. Note also that the transient response of the
filter must be considered, since it will be operating against
pulses, and that the inductors must be constructed so they
can sustain the high voltages that will appear. Parasitic
capacitances may have to be considered in the design.

Antonio Carlos M. de Queiroz