Final answer:
K-rated transformers are designed to handle the extra heat generated by harmonic currents but do not address the root cause of these harmonics or power quality issues.
Step-by-step explanation:
K-rated transformers are specifically designed to handle non-linear loads which produce harmonic currents. These transformers have a higher rated capacity to accommodate the additional heat generated by harmonics without exceeding their temperature rating. While a K-rated transformer does not eliminate the root cause of harmonic currents or improve power quality issues inherently, it is built to withstand the adverse effects and continue operating safely and efficiently.
The root mean square (rms) current and rms voltage provide measurements of the effective values for alternating current (AC) and voltage, which can be affected by harmonic distortion. A K-rated transformer, much like a step-down transformer, takes a particular voltage and reduces it to a lower voltage level, but with added capabilities to handle the extra heat caused by harmonics.