junkhound
Senior Member
- Location
- Renton, WA
- Occupation
- EE, power electronics specialty
Just curious, as was looking at some old files from the 1970s with hand calculations.
What technique do you use now or have used? Do you ever even get asked for those values?
In days of old (aka before PC) would write out the complex vector equations and pull the positive, negative, and zero components from those.
What did you use in the old days? Have even seen old nomographs (remember those?).
Nowadays, PSpice or even homemade spreadsheets make it quick and easy.
Only times ever had to do the calculations was on power systems for military bases when some corps of eng guy would ask for the values of before and after any major load changes or installation of upgrades such as entire site EMP protection.
What technique do you use now or have used? Do you ever even get asked for those values?
In days of old (aka before PC) would write out the complex vector equations and pull the positive, negative, and zero components from those.
What did you use in the old days? Have even seen old nomographs (remember those?).
Nowadays, PSpice or even homemade spreadsheets make it quick and easy.
Only times ever had to do the calculations was on power systems for military bases when some corps of eng guy would ask for the values of before and after any major load changes or installation of upgrades such as entire site EMP protection.