Solar Inverter Harmonics in South Africa Solar inverter harmonics South Africa is now a bigger issue on industrial and commercial sites. Many facilities have added rooftop PV to reduce grid dependence and control electricity bills. But solar inverters also add harmonic current to electrical networks. When that happens, the site may see overheating, unstable power factor, nuisance trips, and weak p...
How to Reduce Electrical Losses in Industrial Power Systems Electrical losses raise operating costs, heat cables and transformers, and reduce available system capacity. They usually result from conductor resistance, inefficient loading, poor power factor, harmonic currents, and aging equipment. To reduce electrical losses in industrial power systems, engineers need accurate measurements, correct e...
Medium Voltage Harmonic Filters: A Complete Selection Guide Medium voltage harmonic filters help industrial facilities, renewable energy plants, utilities, and infrastructure projects control harmonic distortion in their electrical systems. Harmonics can reduce power quality, increase equipment losses, create overheating, and interfere with normal system operation. A correctly designed harmonic fi...
Installing a capacitor bank should improve power factor, reduce reactive power demand and release capacity in transformers and cables. However, some facilities find that their power factor remains below the utility target even after the capacitor bank has been commissioned. This does not necessarily mean the capacitor bank is defective. The cause may be incorrect sizing, changing loads, harmonic d...
A facility can operate normally on utility power and develop power quality problems after transferring to a standby generator. Drives trip, UPS systems report input faults and lights flicker—even though the load has not changed. Nonlinear loads are usually already generating harmonic current. The generator provides a weaker source, allowing the same current distortion to create greater volta...
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...
Even-order harmonics are current and voltage components at even multiples of the fundamental frequency — the 2nd, 4th, 6th and higher orders — that appear as asymmetric distortion in a three-phase power system. They behave differently from the familiar 3rd, 5th and 7th odd harmonics: balanced six-pulse rectifiers do not generate them, but asymmetry does. Half-controlled bridges, DC-off...
High THDi — total harmonic distortion of current — is the ratio of the RMS value of all current harmonics to the fundamental current, expressed as a percentage. It rises when nonlinear loads such as variable frequency drives (VFDs), rectifiers, UPS units and chargers draw current in pulses instead of a clean sine wave. A high reading must be explained, not simply cleared: measure the s...
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