Full Member level 3
I have to design an energy meter/protection relay for a customer. I am receiving 4 current inputs. In my board I am planning to use current transformer followed by the bleed resistor in secondary to convert current to voltage. My customer wants a barrier terminal strips in the rear side of the unit. I had been thinking of having double sided barrier screw terminals, with rear terminals used as inputs and the other side of screw terminals can be used for connecting the loop wire from the current transformers. Not sure about the scheme. My input range is 0-75A. Besides my customer wants PCB board that shall insert into the backplane and easily detachable on demand. I felt this as conflicting requirements. Passing 75A on a PCB for current inputs is not a good choice. Hence loop wire around CT will terminate directly on a screw terminal. In that case the board (housing CTs) cannot be removed like a backplane board. Hence require advice on the right way to terminate CT inputs to meet my customer requirements.