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Re: Pole pig rating
An impulse generator is typically a capacitor charged up to the appropriate
voltage with resistors to set the rise and fall times. For higher voltages
(say >100kV) where capacitors get hard to make, the Marx configuration is
popular, although impulse transformers are also used. The Haefely Test AG
web site(http://www.haefely-dot-com/ or
http://www.haefely-dot-com/high_voltage_test/index.html (Haefly is a big mfr of
this sort of test equipment) is quite interesting.
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> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Pole pig rating
> Date: Monday, May 29, 2000 9:37 PM
>
> Original Poster: "Stan" <sdarling-at-columbus.rr-dot-com>
>
>
>
> Tesla List wrote:
> >
> > Original Poster: "Bert Hickman" <bert.hickman-at-aquila-dot-com>
> >
> SNIP
> > This means that in a properly designed system, an arrestor should
> > virtually always break down before a critical element, even accounting
> > for statistical variation in arrestor breakdown timing and voltage. BIL
> > is tested using a HV surge generator which is designed to develop an
> > approximation of a lighting transient - a fast risetime (1.2 uSec)
> > followed by a relatively slow (50 uSec) decay. Transformers must be
able
> > to withstand the BIL test three times with NO breakdown. A typical 14.4
> > kV pole pig will usually have a BIL of between 95 and 110 kV. In either
> > case, this level of insulation makes for one tough beast!
> >
>
> Bert, that HV Surge generator sounds interesting. What kind of device
> do they use--how does it function (eg Tesla type, Marx, etc)--and what
> kind of output ratings would it have?
>
> -Stan
> >
> > -- Bert --
> > --
> > Bert Hickman
> > Stoneridge Engineering
> > http://www.teslamania-dot-com
>
>