TY - JOUR ID - TI - Reduce no- load losses of Electrical Transformers By Increasing The Number Turns Of Coils تقليل خسائر اللاحمل للمحولات الكهربائية بزيادة عدد لفات ملفي الادخال والاخراج AU - Riyadh Noman Madhloom رياض نومان مظلوم AU - Nariman Khalid Hashim نريمان خالد هاشم PY - 2015 VL - 8 IS - 4 SP - 417 EP - 429 JO - DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية SN - 19998716 26166909 AB - Accompanied transmission and distribution process of electric power several types of losses in power first is called the transport losses resulting from resistance transport wires result the passage of the current and the second the result of the work of electrical transformers and it divided into two categories called a loss of load result of resistance wire electrical coils and the second no- load losses resulting from the use of iron in the transmission of magnetic flux between transformers coil which are divided into two main sections hysteric losses and eddy currents losses The specialists have treated all losses problems above through the use of transformers to reduce energy transmission losses (decreasing current and increasing voltages) and reduce thickness of Iron strip to reduce losses of eddy currents and improve the material and processing methods to reduce the hysteric's losses In this situation the product integrated with a problem is caused by high no-load losses and can not change the iron core material or specifications (thickness or sectional area), adversely affecting the ability to compete with other companies where the value added to the price of the transformer as a result of the energy losses be $ 1800 per kilowatt for no-load losses and $ 600 per kilowatt of load lossesFor the reasons above, the researchers detected a theory scientific study based on the following equation B = (V / N) / (4.44 Ac f)This equation linking number of windings (N) and operating voltage (V), as well as sectional area of the iron core (Ac) and frequency system (f) and the magnetic flux density (B) which is associated with no-load losses positive relationshipTo change the value of the flux density by the above equation can only by changing the values of (N & Ac) because the values (V & f) of the electric grid constantsSo the researchers increased the number of windings (N) to reduce the value of the flux density (B) to reduce no-load losses without changing the value of sectional area (Ac) because the change requires changing the entire production mouldsIt was conducted laboratory tests of (Diala General Company for Electrical Industries) that showed that no-load losses for transformers produced after the development of a lower than 150 watts for transformers previously produced

ER -