Question

Q3. Preamble Techniques involving the electronic control of power to a controlled rectification industry. There can be, however, serious problems with these techniques because of the generation of harmonics and the consequential harmonic distortion. Harmonics, when fed back to the supply, can have adverse effects on other electrical equipment. It can increase the current in power lines resulting wasted power that causes higher temperatures in neutral conductors and distribution transformers. High order harmonics may cause excessive heating in the core of a.c. motors and can also interfere with communication systems. Increased temperatures can damage power systems and shorten the life of electronic equipment. and variable frequency drives are widely used load such as by FIGURE 3 shows the oscilloscope trace of the supply current feeding a variable frequency drive (VFD). FIGURE3