Effects of Power Quality Distortions on Electrical Drives and Transformer Life in Paper Industries: Simulations and Real Time Measurements

Abstract

With the increasing of non-linear loads in results show that voltage sag affects the functionality of electric power system, power quality distortion has adjustable speed drives [4]. Therefore, a good power quality become a serious issue in recent years. In paper and pulp monitoring system is essential for the paper mills in order to industries, due to presence of concentrated high power decrease the downtime and increase the efficiency. Although, non-linear loads such as electric drives, this problem is a electric drives are sensitive to voltage distortions, they are greater concern. In this paper, the impacts of power also one of the major sources of current harmonics generation quality distortions such as voltage sag and swell on the and power quality problems. Electric drives draw nonoperation of electric devices in Mazandaran Wood and sinusoidal currents from the electrical power system. The Paper Industries (MWPI) are discussed. Using the actual current harmonics passing through the impedance of the data, the effects of voltage sag on the main production power system create non-linear voltage drops and cause line motor drive is investigated. In addition, the effects of voltage distortions. Therefore, the input voltage provided to harmonics on the distribution transformers such as the distribution transformers is not pure sinusoidal. One of the increasing their losses and decreasing their life are major effects of harmonic distortions is increasing transformer analyzed.losses. In presence of harmonics, the load loss, eddy current loss, and other stray losses are increased. In addition, they Index Terms -Electrical Drive, Harmonics, Paper Mill, increase the hot spot temperature of the transformer which Power Quality, Transformer Life, Voltage Sag. results in loss of life. Furthermore, if voltage harmonics level is more than standard, audio noise and no load loss will also be

Computation Of Transformer Losses Under The Effects Of Non-Sinusoidal Currents

“…A part of eddy current loss which is produced in structural parts of transformers (except in the windings) is called other stray loss [7,10]. Many factors such as size of core, class of voltage of transformer and construction of materials used to build tank and clamps [11]. To determine the effect of frequency on the value of other stray loss, different tests have been fulfilled.…”

Simulation of the impact of harmonics on distribution transformers

“…Transformer losses are generally classified into no load losses and load losses as shown in (1) [2,3,8].…”

“…The load loss or impedance loss is subdivide into I 2 R loss and stray loss caused by electromagnetic flux in the winding, core, core clamps, magnetic shield, enclosure or tanks walls, etc [3,8]. Thus, the total stray loss is subdivided into winding stray loss and stray loss in components other than the windings ).…”

“…Therefore the influence of the current harmonics is more important. Many works have been developed about the harmonic effect on power transformer loss of life [4,[8][9][10][11][12]. However, these works did not take in consideration the standards of harmonics.…”

Harmonic study for MDF industries: A case study

“…The most important source of voltage and current harmonics in electrical networks are nonlinear loads. Nonlinear loads, which were only fifteen percent of total loads in 1987, have been increased to seventy percent in 2000 [7]. So, ever-increasing of nonlinear load causes inordinate increase of harmonics in network.…”