Describe how tap changer design impacts transformer impedance and how this relates to short circuit current calculations in downstream equipment.

Tap changers are devices installed on transformers to adjust the turns ratio, which is the ratio of the number of turns in the primary winding to the number of turns in the secondary winding. By changing the turns ratio, the output voltage of the transformer can be regulated to compensate for voltage fluctuations on the input side or to meet specific load requirements. The tap changer design, specifically the number of taps and their location on the winding, directly affects the transformer's impedance. Transformer impedance is the opposition to the flow of alternating current, typically expressed as a percentage of the transformer's rated voltage. It's a crucial param....