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Hi All,

To simulate a near strike, I have a power supply which will supply 10KV
but at low current, I use this supply to charge a 0.3uF cap and this
gives me about 15J.

The charged cap is then discharged into either the chassis metal, the
Line, or the neutral/green wire where the neutral/green are shorted
together.

Power is applied to the unit as it normally is on, inside the house,
24/7

The question is 15J discharge from the cap high enough or must I go
higher?

Thanks!

pdrunen

 

[Dave]

Hi All,

To simulate a near strike, I have a power supply which will supply 10KV
but at low current, I use this supply to charge a 0.3uF cap and this
gives me about 15J.

The charged cap is then discharged into either the chassis metal, the
Line, or the neutral/green wire where the neutral/green are shorted
together.

Power is applied to the unit as it normally is on, inside the house,
24/7

The question is 15J discharge from the cap high enough or must I go
higher?

Thanks!

pdrunen

A reasonable simulation might possibly need to mimic the rise and fall
times of the pulse - it depends why you are doing it. Near is of course
a relative word. I'm sure there must be some literature published on this.

 

[legg]

Hi All,

To simulate a near strike, I have a power supply which will supply 10KV
but at low current, I use this supply to charge a 0.3uF cap and this
gives me about 15J.

The charged cap is then discharged into either the chassis metal, the
Line, or the neutral/green wire where the neutral/green are shorted
together.

Power is applied to the unit as it normally is on, inside the house,
24/7

The question is 15J discharge from the cap high enough or must I go
higher?

It depends on the environment that you are trying so simulate.

Energy delivered to LV long branch circuits and outlets (cat2) in
testing is typically less than 1J. (6KV 200A .5uSec 100KHz)

The same test on short branch and feeder circuits (cat3) is more than
double this, with additional 20uSec impulse waveforms potentially
delivering 40J into a low impedance circuit.

You might check for articles by Fran?ois Martzloff, refering to IEEE
Std C62.41 or IEC Basic Standard 77B, which both cover the
environmental classification and testing of circuits for transient and
surge susceptibility.

These used to be available from NIST..

http://www.eeel.nist.gov/bin/publications.cgi

RL

 

[John Woodgate]

You might check for articles by Fran?ois Martzloff, refering to IEEE
Std C62.41 or IEC Basic Standard 77B,

There ain't no sich critter as that second one; 77B is a committee, not
a standard. Look in the IEC 61000-4-xx series.