UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Ed_Dinning · 15th Dec 2020, 9:02 pm

Hi GMB, there was an article on the design of small, non precision CT's in Elektor about 7 years ago based on a small (EI42?) lam stack.
A Kalee says, no problems with CTs being short circuited, and this simple design could easily be protected against an open circuit. It would be possible to fit a burden resistor across the sec winding, but as the normal failure mode of a bridge is to go s/c, again no problem.

Ed

15th Dec 2020, 9:02 pm	#14
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,194	Re: Advice on mains current sensing, safely Hi GMB, there was an article on the design of small, non precision CT's in Elektor about 7 years ago based on a small (EI42?) lam stack. A Kalee says, no problems with CTs being short circuited, and this simple design could easily be protected against an open circuit. It would be possible to fit a burden resistor across the sec winding, but as the normal failure mode of a bridge is to go s/c, again no problem. Ed