Design a power quality mitigation strategy for a facility with significant harmonic distortion.

Power quality mitigation strategy includes: measuring existing conditions (PQ analyzer for harmonics, sags, swells), identifying harmonic sources (VFDs, rectifiers, switched-mode power supplies), designing passive harmonic filters tuned to predominant frequencies (5th, 7th, 11th), considering active harmonic filters for broad-spectrum correction, specifying K-rated transformers (K-13 or K-20) for harmonic loads, implementing phase-shifting transformers for large VFD installations, and installing surge protective devices. Verify IEEE 519 compliance at PCC.