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Reply To: Transformer riddle no.20- Current transformer as current injection source

#1549
Ian Lake

    Practically, you cant do this due to: a) Voltage insulation limitations as mentioned above. b) VA limitations. If you need 1V on the secondary to drive 2000A into the load, the CT needs to be rated at 2000VA. In practice, current injection output transformers with a single turn secondary (as this CT would be) have very large cores to allow operation from a 0-230V input. This is because the transformer has to work at large volts/turn to give the required voltage on the secondary with a single turn. A 2000A injection transformer will typically be 4kVA+ (you need at least 2-3V to drive a few thousand amps down even short output leads). The limiting factor on current is usually the ac impedance of the output leads. Ian Lake