electrialstandards

There are so many methods available by which harmonics can be reduced in system and power quality can be improved. There are following methods of reducing the harmonics in system:- (i)                   DC choke (ii)                 By reducing harmonics at loads (iii)                By using filters Now let’s discuss about them:- (i)                  DC choke:- VFD’s are main source of harmonics generation in a plant. DC choke is used in VFD’s to reduce harmonics. DC choking is an inductance in series with semiconductor bridge circuit. DC choke provides reduction in 5th and 7th Harmonics. DC choke is comparable to an equivalent AC-side line reactor, although the %Total Harmonic Distortion (THD) is somewhat less. (ii)                By reducing Harmonics levels at Loads and Source:- In electrical Transmission and distribution system there are lot of equipment’s connected in distribution so there will be harmonics getting in system . So it will become even more important to minimize th

Harmonics in electrical systems:- Before discussing about consequences of Harmonics you must know what are harmonics:- Harmonics are electric current and voltages that causes power quality problems. These are generated due to electronic equipment’s which draws non linear loads with abrupt pulses. These pulses causes distorted current and voltages causes of which will be discussed in this article. Harmonics are classified according of level of harmonics these are multiple of frequencies such as 2 nd level, 3 rd level, 4 th level, and upto 11 th levels Where 2 nd level means Harmonics with frequency of 100 HZ 3 rd level means Harmonics with frequency level of 150 HZ And similar for other levels Now 2 nd level, 5 th level, 8 th level, and 11 th level will have –ve sequence of currents 3 rd level, 6 th level and 9 th level will have zero sequence of currents 4 th level, 7 th level, 10 th levels will have +ve sequence of currents Harmonics are now integral part of electricity.

Electricity works on an idea that whenever two dissimilar metals bring in contact with an electrolytic solution then there will electron movement in these metals when these metals are connected using a conductor. All plants consist of fluid which is electrolyte for metals. So using above principle of inserting metals in a fluid will leads to electricity generation. We have done during childhood for generating electricity from potatoes. It works on principle that Potatoes contains a liquid in which many water soluble chemicals are present. So these may cause a chemical reaction with one or both of our electrodes. So we will get some electricity from that . Best result will be obtained while using zinc and copper electrodes. Let’s discuss about the same experiment:- For conducting experiment let’s take 8 potatoes. We will take 8 potatoes to get enough electricity to light up a LED. Now insert different metals of any shapes into these potatoes. Now by using small wires all potatoes are