Skip to main content

CALCULATION OF TRANSFORMER LOSSES UNDER NON-SINUSOIDAL CURRENTS USING:TWO ANALYTICAL METHODS AND FINITE ELEMENTS ANALYSIS

CALCULATION OF TRANSFORMER LOSSES UNDER NON-SINUSOIDAL CURRENTS USING:TWO ANALYTICAL METHODS AND FINITE ELEMENTS ANALYSIS
An article discussing effects of non-sinusoidal currents to the transformer losses. This article was made through the effort of M.Yazdani-Asrami, M.Mirzaie and A.Shayegani-Akmal of Babol University of Technology, Babol, Iran.

Introduction
Transformers are the most important component in power system and are interfaces between consumers and suppliers. Contemporary with ever-increasing electrical energy demand, the number and capacity of installed transmission transformers and especially distribution transformers are increasing. However, considering the point that the efficiency of these components is 97-99%, there was not enough attention to the amount of loss and performance of transformers. By considering the large number of transformers in transmission and distribution networks, it can be seen that the total power loss of these components is high. So, any reduction in loss of transformers would considerably reduce the total loss of electrical network and this will lead to optimum utilization of energy resources and helps environmental preservation.

In recent decades, many of transformers that was installed for supplying linear loads with full sinusoidal current at the first. gradually, their main loads have been exchanged with non-linear loads that produces harmonic current. Increasing the amount of harmonic contents of load current creates extra loss in windings and thus, lead to increase in their hot spot temperature, increase of stress in their insulations, reduction of insulation useful life and ultimately,reduction of transformer capacity.

Loads that produce harmonics in the electrical system are; rectifiers, electronic phase control, PWM drivers, UPS, cyclo converters, arc furnaces, adjustable speed drives, computers and ballast of fluorescent lamps in official center and large ventillation systems in commercial centers.

Labels:

Comments

  1. SaipowercontolsJuly 4, 2011 at 3:19 PM

    Furnace Transformers Manufacturers
    Sri Sai Ram Power Controls - Designed as per the international standard of excellence. Engineered from premium quality raw material and furnace transformers Manufacturers.
    http://www.saipowercontrols.in/Furnace.php

    ReplyDelete
  2. DilipSeptember 22, 2020 at 2:55 PM

    Great information. very useful blog. thank you. keep posting.

    SMPS Transformer Manufacturer in India | Toroidal Transformer in India

    ReplyDelete

Post a Comment

Popular posts from this blog

PARTS OF A POWER TRANSFORMER

What are the name of the basic parts of a Power Transformer? We can not deny the fact that only a handful of electrical engineering students are presently familiar with power transformers especially on what it looks like. Unlike a transformer we found in our homes, a power transformer’s appearance and construction is somewhat more complicated. It is not just a simple winding with a primary and secondary terminal although basically any transformer has one. The function that a power transformer plays in an electrical system is very important that an electric utility can not afford to loss it during its operation. Our discussion here will focus more on the basic parts and functions of a power transformer that are usually tangible whenever you go to a substation . Although not all power transformers are identical, nonetheless they all have the following listed parts in which the way of construction may differ.
56 comments
click here to continue

ELECTRIC MOTOR NAMEPLATE SPECIFICATIONS

How do we interpret an electric motor nameplate? Motor standards are established on a country by country basis.Fortunately though, the standards can be grouped into two major categories: NEMA and IEC (and its derivatives). In North America, the National Electric Manufacturers Association (NEMA) sets motor standards, including what should go on the nameplate (NEMA Standard MG 1-10.40 "Nameplate Marking for Medium Single-Phase and Polyphase Induction Motors").
48 comments
click here to continue

DISADVANTAGES OF Y-Y CONNECTION IN THREE PHASE SYSTEM

What are the disadvantages in using y-y connection? The Y-Y transformer connection was poorly understood in the early days of power engineering and it received a very bad reputation when it was first used; in fact, this connection was avoided for a long time until its limitations were overcome by good engineering practice. Some of the inherent disadvantages of the Y-Y connection are discussed below:
4 comments
click here to continue