Generally, when measuring high voltage and high current transformer signals, you use a VT (voltage transformer) and CT (current transformer). The ratios between the primary and secondary rated voltages and rated currents are the VT and CT ratios. For example, if the rated primary current/rated secondary current is 500 A/5 A, the CT ratio is 100. The same holds for VT. If not using a VT or CT, each ratio is 1.
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