Reflections at a short-circuit


by freddyfish
Tags: reflections, shortcircuit
sophiecentaur
sophiecentaur is offline
#19
Mar2-13, 09:52 AM
Sci Advisor
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P: 11,352
Should be required viewing for everyone, before they think of asking questions about waves 'n' things on PF.
So much for Computer Graphics.
Brilliant.
Windadct
Windadct is offline
#20
Mar2-13, 10:10 AM
P: 532
Actually - I never totally got my brain around this until I used a Time Domain Reflectometer (TDR) - the wiki is http://en.wikipedia.org/wiki/Time-domain_reflectometer

Basically is it a RADAR for a transmission line - when set to the right line type, it will tell you distance to AND type of fault ( Short, Open, impedance mis-match - etc).

I started using a thumper ( http://www.hvinc.com/downloads/cds_brochure.pdf ) which evolved into a TDR-Thumper ( http://green.rapidsw.com/images/pdfs...andThumper.pdf ) The thumper name comes from the sound, used on Medium V ( 1000-69KV) buried cable, when you shoot a 1000J down the cable - and it hits the fault - it makes a thump - of course when you dig up the cable and still can not find the fault you do it again - then it is a BANGer!


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