Delta Power Quality is a term that refers to the ability of a power source to maintain a consistent voltage and frequency, free from disturbances such as voltage sags, swells, and harmonic distortion. A power source with high delta power quality is able to provide stable and reliable power to electrical equipment and systems, helping to ensure their proper function and longevity. Factors that can affect delta power quality include the type and condition of electrical equipment, the nature of the load being powered, and the quality of the electrical grid supplying the power. Companies such as Delta Electronics specialized in providing power quality solutions, such as UPS, harmonic filters, and active power filters to improve the power quality.