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Line impedance query

me1899
Hi 


I am looking at a job where a supply to a replacement CT scanner has to be calculated.


The current scanner is fed by a cable with line impedance 0.06 at source end of the sub panel that feeds it.


The new scanner must have a line impedance no more than 0.06 so basically I can't use the way on the current panel.


The client engineer has said to run from the intake and provide a cable calc to prove the line impedance is OK for the new scanner feed (this is D and B).


I am using AMTECH and was wondering if there was a way to output line impedance or if I need to show a calculation another way?


The client engaged a firm to do line impedance tests, and their report shows values measured between L1-L2, L2-L3 and L1-L3, but looks like they did testing at the sub panel and not at the intake.


This is basically like PSCC right? So I can get PSCC from AMTECH, divide by root 3 and work out impedance from there?


Am I on the right track? Assistance would be much appreciated.


Regards


Anisur
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    The field solution involves one scanner in a container that arrives on a lorry and then with a big clockwork key it all telescopes out to make the  treatment room,
    This public domain link gives the flavour.  The video suggests it deploys in 3mins 11 seconds, actually it is more like a very  busy morning, but is still impressive (we borrowed one of these trick containers once for something else).


    For power there will be an adjacent container holding a diesel engine that would happily power a double decker bus, probably with turbo charger and intercooler. and an induction genset (to keep the overall shaft length down). The solution to the impulsive load, as it is for quite a few other pieces of  kit with nasty current demand profiles in green painted boxes,  is to request the genset makers to fit the extra large flywheel option and over sized crankshaft bearings on the prime mover relative to the same engine for road use.
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  • 0
    The field solution involves one scanner in a container that arrives on a lorry and then with a big clockwork key it all telescopes out to make the  treatment room,
    This public domain link gives the flavour.  The video suggests it deploys in 3mins 11 seconds, actually it is more like a very  busy morning, but is still impressive (we borrowed one of these trick containers once for something else).


    For power there will be an adjacent container holding a diesel engine that would happily power a double decker bus, probably with turbo charger and intercooler. and an induction genset (to keep the overall shaft length down). The solution to the impulsive load, as it is for quite a few other pieces of  kit with nasty current demand profiles in green painted boxes,  is to request the genset makers to fit the extra large flywheel option and over sized crankshaft bearings on the prime mover relative to the same engine for road use.
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