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Re: [TCML] Primary Capacitors ... Again ...
Hi Tom,
These are excellent caps - as long as you don't inadvertently overvolt
them. The ringing discharges within a TC primary circuit cause
peak-to-peak voltage excursions that can rapidly overvolt and destroy
the dielectric system. In fact, this particular pulse capacitor type has
been destroyed by a number of coilers who used a single cap in 14.4 - 15
kV pig and NST-powered systems.
A good rule of thumb for is to multiply the RMS output voltage of your
HV transformer by three and use that as the _minimum_ DC voltage
faceplate rating for your commercial pulse capacitor. A 14.4 kV pig
needs a capacitor rated for at least ~43 kV. Connecting a couple of
these caps in series will provide sufficient voltage handling capability
for your system. However, you'll also need to combine one or more sets
of series-connected capacitors in parallel to provide a higher bang size
and higher power processing capability from a pig-powered system.
Bert
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Thomas Schmit wrote:
Ok - so what is the general opinion of the following for the primary
capacitor of a pig powered coil?
http://theelectrostore.com/datasheets/pulse_maxwell_specs.jpg
They are low inductance, high voltage, high current energy discharge
caps but they are only rated for 500 pps, which seems to be typical
of these type of caps... how will they perform at high frequency?
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