A 1,000 kVA transformer feeding six-pulse VFDs, spot welders and single-phase loads is a textbook harmonic source. Field measurements on such busbars typically show current THD of 25–40 % at the PCC, with the 5th and 7th orders dominant. Third-order currents add up in the neutral conductor and overheat it. Fixed capacitor banks rarely survive this environment. When the natural resonan...
What Causes High THDi and How Can You Reduce It High THDi is a common warning sign in systems containing variable frequency drives, rectifiers, UPS units, chargers, and other electronic equipment. It means the current waveform differs significantly from the smooth sine wave supplied by the utility. This distortion can increase heat, consume capacity, and reduce reliability. However, the percentage...
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