Tricky but Easy Electrical Engineering!
Cleaning of overhead transmission line is not required because any dust and dirt that falls out of the sky onto them will be limited thickness and will not affect the electricity flow in any way nor will it decrease clearance (which is the insulation) in any meaningful way. Thus it is not necessary to clean … Read more
Losses in the transformer are of the order of 1% of its full load kW rating. There are mainly two types of losses in a Transformer i.e. Core Loss and Ohmic Loss. Because of these losses the winding of transformer as well as Core gets heat up and we need to provide sufficient cooling to … Read more
Current Transformers are classified as Dead Tank Type and Live Tank Type CTs based on their construction. The term Dead and Live has their own meaning from the view point of potential of Secondary Windings and Core. Dead Tank itself means that the potential of the Tank of CT is at earth potential i.e. zero … Read more
In principle, of course transmission lines can be rated in kW. There is some upper limit as to the power they can transmit. If the Power exceeds that power level then the lines would overheat, leading to breakdown of insulation and perhaps to the lines melting. But such a method of rating is pretty impractical. … Read more
Hydrogen is used for the cooling of Rotor winding i.e. field winding and Rotor Core in Turbo Generator. As shown in figure below, there are small windows on the Rotor structure which allows the passage of Hydrogen. This hydrogen cools the Rotor structure and filed winding. This hydrogen after cooling becomes hot which in turn … Read more
Before going to the mark difference between Dry Type Transformer and Oil Filled Transformer, it is worth to have some discussion on Dry Type Transformer. Dry Type Transformer: Dry Type Transformers find use in locations where the use oil Filled Transformers increases the fire hazard such as shopping malls, Hospitals, residential complexes etc. In dry … Read more
Transformer Oil is basically an Insulating Oil. Insulating Oils or Transformer Oils are mineral electrical insulating oils processed from fractional distillation and treatment of crude petroleum. An Insulating Oil must have the following properties: 1) Excellent dielectric properties resulting in minimum power loss. 2) High resistivity leading to better insulation values between windings. 3) High … Read more
As we know that Demineralized Water (DM Water) is a good insulator so it can strike our mind that why don’t we use DM water for cooling purpose of Transformer in place of Oil? To find the answer, we comare the properties of DM Water and Transformer Oil. Electrical Conductivity: Both Transformer Oil and Demineralized … Read more
First of all we should know why do we need to improve the power factor? Suppose we want to transmit P amount of power to the load center with a power factor of 0.1. Thus, Current flowing through the Transmission Line I1 = P/0.1V = 10P/V Now if we transmit power at a power … Read more
If you get a chance to visit any substation or Switchyard, you will notice that the surface of the Switchyard is fully covered with small size Gravels. The use of gravels on the surface has the following things to do: Although Substation / Switchyard grounding is very low in the range of 0.5 to 5 … Read more