DX Europe Low Cost CT

Why the secondary terminal of CT should not be left open-circuited?
In current transformer, the primary current does not depend on the secondary load of CT. It purely depends on the line current where it is connected in series. If the secondary winding of CT is kept open then secondary current will be zero while the primary current of CT will remain the same. Therefore the opposing MMF in secondary winding will no longer exist. Hence the net MMF due to primary current only which is very large. This large MMF will produce huge flux in the core of CT. Hence it will saturate the core of CT. Again, due to huge flux in the core, the flux linkage of secondary winding will be large which in turn will produce a very large amount of voltage across the secondary terminal of the CT. Hence the large voltage across the secondary of CT will be very dangerous which will lead to insulation failure. There is a chance that the person who is opening the secondary winding of CT while the primary is energized will die due to electrical shock.

1) Safe, easy to install, portable

2) Wide inner window, allowing clamping of big cables or bus-bars

3) Wide range of sizes to accommodate all the existing installations