Answer Question
Issues with CT
We are having issues with CT in our circuit. Looking at fault current magnitude to be max around 7200 Amp in the circuit we have chosen a CT rating of 8000:5. However, when we are seeing the CT secondary current on the plot, it is still coming quite close to the input current. (Ideally, the value should be < 5 Amps). We saw about this in the PSCAD cookbook example as to what CT secondary current magnitudes they have. Over there also the CT secondary magnitude is in the kA range. Only if we are putting CT rating as- 8000*1000: 5, We are getting the expected currents on CT secondary. Can you please tell me how to set up the CT correctly? (Attached are reference Images)
(Green plot is CT secondary current) (CT parameters given) (CT current plot if we give 8000*1000 :5) (PSCAD cookbook CT plot)
(Green plot is CT secondary current) (CT parameters given) (CT current plot if we give 8000*1000 :5) (PSCAD cookbook CT plot)