Parallel Resonance: Capacitor Bank and Supply Transformer at 323 Hz

A 600 kvar capacitor bank on a 480 V bus fed by a 1000 kVA, 5.75% impedance transformer. The reactance plots cross near 323 Hz, close to the 5th harmonic (300 Hz), producing an impedance peak of about 5.1 Ω, with mitigation options listed.