Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 27 replies
  • Subscribers 32 subscribers
  • Views 3684 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

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
Parents
  • 0
    Thanks OMS, some responses below:


    1 - We have asked question about the generator of the main consultant - it was never mentioned in the tender and at the minute I have no idea of the genny size or anything like that, The main consultant has to guide us as to whether we look to stop the scanner coming on genny or if we go for it. I'll post updates as I get them.


    2 - Sorry, should have said, the control panel has a little UPS provided by the manufacturer, but not the scanner itself.
Reply
  • 0
    Thanks OMS, some responses below:


    1 - We have asked question about the generator of the main consultant - it was never mentioned in the tender and at the minute I have no idea of the genny size or anything like that, The main consultant has to guide us as to whether we look to stop the scanner coming on genny or if we go for it. I'll post updates as I get them.


    2 - Sorry, should have said, the control panel has a little UPS provided by the manufacturer, but not the scanner itself.
Children
No Data

Community Rules & Guidelines