ELECTROMAGNETIC INTERFERENCE
fibre) were used instead of steel. When steel rebars are used, electric/electronic facilities and cabling have to be insulated from the structure. By insulating them from each other, the path [3] of common mode noise seen in Figure 2 is blocked, the flow route is limited to the grounding lines and thus, its propagation to other devices is minimised as are the adverse effects of irradiation of electromagnetic fields. Although noise still flows through the grounding lines, it can be suppressed by providing a noise filter that is specially designed for grounding use. Another advantage is that when noise interference occurs, it is easier to identify the noise flow route and initiate adequate countermeasures. As previously stated, to protect
electric/electronic facilities against lightning and inverter noise, they can be electrically insulated from the building structure. If it is possible to use bars of fibre reinforced plastic such as aramid fibre bars as the rebars for the concrete instead of steel sections or bars, it is easier to electrically insulate the facilities from the building structure. However, bars of fibre reinforced plastic have significantly different properties to steel bars and further studies are therefore required regarding their use in building structural engineering and electrical engineering.
Conclusion The application of information and communications technology is rapidly expanding, the use of robots is increasing and more and more facilities are being controlled automatically. Machines and devices are therefore becoming increasingly vulnerable to electromagnetic disturbance. Inverters are increasingly used for different applications, but such new types of power device emit electromagnetic noise. Therefore, the electromagnetic environment inside buildings is becoming less and less favorable for the safe and stable operation of electric/electronic equipment. However, medical and welfare establishments are required to maintain their machines and devices and for this reason, measures for creating a safe electromagnetic environment based on the electrical separation of the facilities from the building structure are of fundamental importance.
References 1 Kotoku T, Kaji R et al. AIST Consortium on Dependable Electromagnetic Environment: Utilization Space Guidelines for Robot Technology and Information and Communication Technology. AIST Technical Report 2013; AIST12-J00011.
2 Akao S, Kawase T et al. Study on the utilization of space for RT and ICT. J Robotics Society Japan 2014; 32 (10): 53-60.
IFHE DIGEST 2019
Figure 3. Protective measures against lightning.
IFHE
Figure 4. Measures against inverter noise. 25
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