Transformer Overheating Explained: Why It Happens Below Rated Load A transformer can run unusually hot even when the connected load appears safely below its nameplate rating. Current may seem acceptable while winding or enclosure temperatures continue rising. This often happens because loading is assessed only in kilowatts or average amperes. Harmonics, imbalance, poor power factor and inad...
APFC Panel Troubleshooting: 7 Common Faults and How to Fix Them An automatic power factor correction panel may begin switching incorrectly, miss its target or repeatedly trip capacitor stages. A newly commissioned APFC panel can also fail from its first day. The cause is not always a defective capacitor. CT installation, controller settings, harmonics, switching components and changing load...
A 480 V transformer that runs within nameplate kVA can develop abnormal temperature rise when VFDs, UPS rectifiers, and switched-mode loads inject high harmonic current into its secondary bus. The transformer does not see only useful fundamental current; it carries distorted current through its windings, terminations, and neutral conductor hour after hour. An Active Harmonic Filter measures...
Hybrid SVG + Capacitor Bank Reactive Power Compensation Your capacitor bank trips once a month, the contactor welds shut, and the DISCOM bill still carries a penalty line. The 250 kVA rectifier load from your new VFDs is the reason, and adding more capacitors will make it worse. A hybrid SVG + capacitor bank system fixes the root cause instead of compensating for it. This article explains why fixe...
SVG and AHF maintenance is the scheduled inspection, measurement and component-replacement programme that keeps a static var generator (SVG) and an active harmonic filter (AHF) inside their design limits — stable reactive power compensation, a corrected power factor, and harmonic current below the limits agreed at the point of common coupling (PCC). Most plants do not lose power quality equi...
Why a Solar Plant Needs Active Compensation A Static Var Generator (SVG) is an active, IGBT-based power-electronics compensator that stabilises voltage, supplies or absorbs reactive power and filters harmonic current at the point of common coupling (PCC) of a solar plant. It turns unstable PV output into grid-compliant power for EPC contractors, electrical engineers, procurement teams and power-qu...
When Power Quality Equipment Must Also Be Quiet A Static Var Generator is normally evaluated by reactive power capacity, response time, power factor control and harmonic compensation. In many installations, the equipment room adds another requirement: the solution must also control noise, dust exposure and maintenance demands. YT Electric’s Fanless Static Var Generator uses natural he...
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...
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