Hosseini Monireh, Monazzam Mohammad Reza, Farhang Matin Laleh, Khosroabadi Hossein
Department of Physics, Faculty of Basic Sciences, Islamic Azad University-North Tehran Branch, Tehran, Iran,
Environ Monit Assess. 2015 May;187(5):258. doi: 10.1007/s10661-015-4449-y. Epub 2015 Apr 16.
Electromagnetic fields in recent years have been discussed as one of the occupational hazards at workplaces. Hence, control and assessment of these physical factors is very important to protect and promote the health of employees. The present study was conducted to determine hazard zones based on assessment of extremely low-frequency magnetic fields at electric substations of a petrochemical complex in southern Iran, using the single-axis HI-3604 device. In measurement of electromagnetic fields by the single-axis HI-3604 device, the sensor screen should be oriented in a way to be perpendicular to the field lines. Therefore, in places where power lines are located in different directions, it is required to keep the device towards three axes of x, y, and z. For further precision, the measurements should be repeated along each of the three axes. In this research, magnetic field was measured, for the first time, in three axes of x, y, and z whose resultant value was considered as the value of magnetic field. Measurements were done based on IEEE std 644-1994. Further, the spatial changes of the magnetic field surrounding electric substations were stimulated using MATLAB software. The obtained results indicated that the maximum magnetic flux density was 49.90 μT recorded from boiler substation, while the minimum magnetic flux density of 0.02 μT was measured at the control room of the complex. As the stimulation results suggest, the spaces around incoming panels, transformers, and cables were recognized as hazardous zones of indoor electric substations. Considering the health effects of chronic exposure to magnetic fields, it would be possible to minimize exposure to these contaminants at workplaces by identification of risky zones and observation of protective considerations.
近年来，电磁场已被视为工作场所的职业危害之一。因此，控制和评估这些物理因素对于保护和促进员工健康非常重要。本研究旨在通过使用单轴HI - 3604设备评估伊朗南部一个石化综合设施变电站的极低频磁场，来确定危险区域。在使用单轴HI - 3604设备测量电磁场时，传感器屏幕应定向为与磁力线垂直。因此，在电力线位于不同方向的地方，需要将设备朝向x、y和z三个轴。为了进一步提高精度，应沿三个轴中的每一个轴重复测量。在本研究中，首次在x、y和z三个轴上测量磁场，其合成值被视为磁场值。测量是根据IEEE std 644 - 1994进行的。此外，使用MATLAB软件模拟了变电站周围磁场的空间变化。获得的结果表明，锅炉变电站记录的最大磁通密度为49.90 μT，而在该综合设施的控制室测量到的最小磁通密度为0.02 μT。正如模拟结果所示，进线面板、变压器和电缆周围的空间被识别为室内变电站的危险区域。考虑到长期暴露于磁场对健康的影响，通过识别危险区域并遵守防护注意事项，有可能在工作场所将这些污染物的暴露降至最低。
