Quick question on mag curves.
Quick question on mag curves.
(OP)
Whenever I have carried out a mag curve I have always been told to drive it into saturation (1A through the secondary), bring it down slowly to 0 then plot various points up to the knee point and carry on all the way up to complete saturation again. The other day I got into a heated discussion with a senior engineer as he stated that you only have to take it to the knee point and that's it. I like to go past the knee point to get a good feel for how matched the CT's are and also to make sure they're no shorted turns. Is what he says right? I can't seem to find any conclusive documents to suggest either way. Any of you got any suugestions to throw in the mix?
Thanks
Thanks






RE: Quick question on mag curves.
Also, you should not need to drive a CT into deep saturation to detect shorted turns.
RE: Quick question on mag curves.
Also, in the case of a multi-ratio CT, you can use lower tap connections to do the same thing, which could lower the effective saturation voltage you need to apply.
After you demag the core you do not have to take it up to saturation again unless you want to measure that point, otherwise go only as far as you need to.