AN EXPERIMENTAL STUDY FOR COMPARING THE EFFECT OF THE MAGNETIC FIELD ON HUMAN HEALTH AROUND TRANSFORMERS IN SINUSOIDAL AND NON-SINUSOIDAL CURRENT CONDITIONS

AN EXPERIMENTAL STUDY FOR COMPARING THE EFFECT OF THE MAGNETIC FIELD ON HUMAN HEALTH AROUND TRANSFORMERS IN SINUSOIDAL AND NON-SINUSOIDAL CURRENT CONDITIONS

ARABUL, Ahmed Y.
SENOL, Ibrahim
KUMRU, Celal F.
BOYNUEGRI, Ali R.
KESKIN, Fatma

It is known that high voltage transmission lines are used for energy transmission to decrease power losses and increase system efficiency. The energy, which is transmitted at high voltages for long distances, is distributed at medium voltages through a step-down transformer near residential areas. Then the energy is introduced to the end users by reducing the voltage to lower levels. Today, these transformer stations are planted as close as possible to living areas to enhance system efficiency. These transformer stations placed in urban areas cause magnetic fields to occur due to the reason of carrying high load currents. Especially due to the decreasing voltage level at these mentioned transformer substations, the load current increases significantly. Because of that, magnetic field strength is enhanced near these urban areas. Additionally, according to the developing technology, characteristic currents of electrical loads are changed at recent years. High penetration of power electronic loads in industrial applications cause a significant increase in high frequency components in the current drawn from electric grid. Similarly, these currents also generate magnetic fields which consists high frequency components. As known there may be some influences to people who is exposed to a magnetic field over a threshold value for quite a while. For this reason, some standards were published to limit the magnetic field strength and exposure time values. In this study, magnetic field variations around a transformer are analyzed for several loading conditions with and without harmonics. For this purpose a test system with electronic load bank, transformer and regulator is built on laboratory and tests are done in several loading conditions. The gathered results are analyzed for sinusoidal and non-sinusoidal current conditions considering the standards. Keywords: Human Health, Transformer, Harmonics, Magnetic Field

Article
PeerReviewed

ISSN 978-9958-834-36-3

International Burch University

2014-05-15

2498