I've been reading up alot on how to work with a CT. Basicly you have a primary current (eg: 100A) and a turns ratio (eg:1:2500) and a load resistance (eg:5 ohms) so now things are straight forward we can calculate the secondary current (40mA) and let's put a burden resistor 3 ohms to get 120mV while not exceeding the maximum power the CT can deliver. Now I'm currently working on an energy meter design, and while looking for the suppliers i'm getting these specs. As you can tell the supplier is giving out " Rated primary current " and " Max primary current". I've opened a 80A rated energy meter and found out the CT's have a writing " 5 (80)A / 2.5mA/0.1 " , is it 5A or 80A ?
My questions :
- On an absolute maximum load 100A will this CT not saturate ?
- How can i work with this thing ? is it supposed to be saturated somehow and still work on both spectrums ?
Finally got a response from a supplier. The response is as follows,