Wednesday, 2 March 2016

Harmonic Study and Power Quality Study

                  Harmonic Study and Power Quality Study

harmonic filter
Harmonic  study

Most people don't realize that harmonics have been around a long time. Since the first AC generator went online more than 100 years ago, electrical systems have experienced harmonics. The harmonics at that time were minor and had no detrimental effects
A pure sinusoidal voltage is a conceptual quantity produced by an ideal AC generator built with finely distributed stator and field windings that operate in a uniform magnetic field. Since neither the winding distribution nor the magnetic field are uniform in a working AC machine, voltage waveform distortions are created, and the voltage-time relationship deviates from the pure sine function. The distortion at the point of generation is very small (about 1% to 2%), but nonetheless it exists. Because this is a deviation from a pure sine wave, the deviation is in the form of a periodic function, and by definition, the voltage distortion contains harmonics.

Loads that make use of semi conductor devices like transistor thyristor i.e. static rectifies. (AC/DC conversation using SCRS), static frequency converters, static inverters like :
Static power converters (AC-DC conversion using SCRS)
Static rectifiers
Static frequency converter
Static uninterruptible power supplies
Static induction regulators

Variable impedance loads, using electric arcs, arc furnaces, welding units, fluorescent tubes, discharge lamps, light control, brightness etc.
Loads using strong magnetizing currents saturated transformer, inductance furnaces, reactors etc.

Therefore harmonic studies assume great significance to understand network power quality and negative impact they can have on network. NECPL can offer continuous studies from 24 hours to many days by high end waveform and PQ recorders so that to comprehensively understand harmonics during various load cycles and their impact on network devices. 

We can offer high quality PQ studies for short durations, 24 hours to many days by high end waveform and PQ recorders so that to comprehensively understand harmonics, voltage flicker, Voltage fluctuation (Sags & Spikes), power factor issues during various load cycles of plant / office and their impact.

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