A Series Capacitor is not included in the list of ETAP elements in the AC Edit Toolbar. However, it doesn’t mean that we can’t include a series capacitor in our one-line diagram and simulation. This is because modeling a series capacitor in ETAP is very easy using a simple trick.
Thursday, July 28, 2011
Supercapacitor or Ultracapacitor is technically an electrochemical double layer capacitor (EDLC). This technology is already gaining ground in challenging the Battery as the leading and preferred energy storage device. It exemplifies a large improvement from the common electrolytic capacitors, which are quick and powerful but energy poor. Meanwhile, supercapacitors are energy-rich storage devices whose first applications are likely to be in hybrid electric vehicles and backup power supplies.
Tuesday, July 26, 2011
Harmonics are described by IEEE as sinusoidal voltages or currents having frequencies that are integer multiples of the fundamental frequency at which the power system is designed to operate. This means that for a 60-Hz system, the harmonic frequencies are 120 Hz (2nd harmonic), 180 Hz (3rd harmonic) and so on. Harmonics combine with the fundamental voltage or current producing a non-sinusoidal shape, thus, a waveform distortion power quality problem. The non-sinusoidal shape corresponds to the sum of different sine waves with different magnitudes and phase angles, having frequencies that are multiples of the system frequency.
Sunday, July 24, 2011
Introduction to Electromagnetic Compatibility (2nd Edition) deals with the subject of interference in electronic systems. It builds on the undergraduate electrical engineering concepts and applies them to the design of electronic systems that operate compatibly with other electronic systems and do not create interference phenomena.
Saturday, July 23, 2011
Single-phasing occurs when one phase of a three-phase system is intentionally or accidentally opened. It is considered as the worst case of Voltage Unbalance and can either be in the primary side or secondary side of a distribution transformer. However, this post will only discuss single-phasing on the secondary side of the transformer.
Wednesday, July 20, 2011
Switched Mode Power Supply (SMPS), sometimes called Switcher is gaining popularity in the last decade or so. The SMPS is more efficient and lighter in weight as compared to its conventional counterpart, the linear power supply.
Thursday, July 14, 2011
Electrostatic Discharge (ESD) is a form of an impulsive transient exhibited by the rapid and momentary flow of electrostatic charge two things that are at different potentials. Generally, this sudden discharge of static electricity does not harm the human body, but it can create several problems such as damaged electronic components, equipment downtime, safety concerns and material handling issues in the manufacturing and production facilities.
- I am a Professional Electrical Engineer with a Masters Degree in Business Administration. My interest is in Power Quality, Diagnostic Testing and Protective Relaying. I have been working in an electric distribution utility for more than a decade. I handle PQ studies, power system analysis, diagnostic testing, protective relaying and capital budgeting for company projects.