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Transcript
Transformer Impedance In Simple Terms • Transformer impedance is the % of rated voltage required to push 100% of the rated secondary current when the secondary winding is short circuited. Simplified Equivalent Circuit Transformer impedance Z = R + jX Z is represented in percent of rated primary voltage to cause rated secondary current in a short-circuited secondary. Transformer Impedance •Transformer Impedance Is A Major Parameter To Enable Parallel Operation Of Transformers •For Proper Paralleling The Following Are Required: – Same Percentage Impedance For All Units (With Some Tolerance) – Same Phase Relationship Between Windings – Same Voltage Ratios – Similar Power Ratings Maximum available fault current • Calculate the secondary (LS) current at the given MVA • Calculate what the impedance related voltage is based on the % impedance. • Calculate how many times the calculated voltage will go into the rated primary voltage. • Multiply this number by the full load current at the MVA Now The Easy Method • Fault Amps = Full Load Amps ÷ Impedance • FA = 656 ÷ 0.0791 • FA = 8293
