Model and Validation of the Electromagnetic Interference Produced by Power Transmission Lines in Robotic Systems

Background: There has been rising concern amongst the public regarding their home's proximity to high tension power transmission lines. The primary cause of fear is the impact of the electromagnetic interference (EMI) radiation on the nearby occupants' health. Despite the presence of national permissible limits of EMI radiation, there is still lack of information with regards to the EMI radiation of the types of power lines configuration in Malaysia. Methods: The electric and magnetic fields of several selected power transmission lines were simulated using the EMFACDC software program from the recommendation ITU-T K.90. Five types of power transmission lines available in Malaysia are considered. Results: It was found that the simulated electric and magnetic field levels at all the power lines' right of way (ROW) boundary complies with the prescribed exposure limit. However, the electromagnetic fields (EMF) level increases significantly as the separation distance is reduced from 30m. For a more conservative approach, the ROW can be set at 30m across all transmission voltage level and corridor area condition. Conclusion: It can be concluded that Malaysia's power transmission lines are within the prescribed exposure limits. To further minimize the electric and magnetic field level, it is recommended that the residential building should be built at least 30 meters away from the power transmission lines, especially for the 275kV double circuit, 275/132kV quadruple circuit, and 500kV double circuit lines.

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Control of EMI in High-Technology Nano Fab by Exploitation Power Transmission Method with Ideal Permutation

Applied Sciences ◽

10.3390/app112411984 ◽

2021 ◽

Vol 11 (24) ◽

pp. 11984

Author(s):

Yu-Lin Song ◽

Manoj Kumar Reddy ◽

Hung-Yi Lin ◽

Luh-Maan Chang

Keyword(s):

Magnetic Fields ◽

Transmission Lines ◽

Electromagnetic Interference ◽

Power Transmission ◽

High Technology ◽

Power Cable ◽

Power Transmission Lines ◽

Transmission Method ◽

Additional Energy ◽

The Ideal

There are many high-power electrical cables around and within semiconductor foundries. These cables are the source of extremely low-frequency (ELF < 300 Hz) magnetic fields that affect the tools which operate by the function of electronic beams. Miss operation (MO) happens because the ELF magnetic fields induce beam shift during the measurement or process for cutting-edge chips below 40 nm. We present the optimal permutation of power transmission lines to reduce electromagnetic influence in high-technology nano fabs. In this study, the magnetic field was reduced using a mirror array power cable system, and simulation results predicted the best permutations to decrease the electromagnetic interference (EMI) value to below 0.4 mG in a working space without any shielding. Furthermore, this innovative method will lower the cost of high-technology nano fabs, especially for the 28 nm process. The motivation behind this paper is to find the ideal permutation of power transmission lines with a three-phase, four-cable framework to decrease the EMI in high-technology nano fabs. In this study, the electromagnetic interference was diminished using the ideal-permutation methodology without investing or using additional energy, labor, or apparatus. Moreover, this advanced methodology will help increase the effectiveness and reduce the costs of nano fabs. The mathematical and experimental results of the study are presented with analysis.

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METHOD OF SYNTHESIS OF CLOSED-LOOP SYSTEMS OF ACTIVE SHIELDING MAGNETIC FIELD OF POWER TRANSMISSION LINES

Tekhnichna Elektrodynamika ◽

10.15407/techned2016.04.008 ◽

2016 ◽

Vol 2016 (4) ◽

pp. 8-10 ◽

Cited By ~ 1

Author(s):

B.I. Kuznetsov ◽

◽

A.N. Turenko ◽

T.B. Nikitina ◽

A.V. Voloshko ◽

...

Keyword(s):

Magnetic Field ◽

Transmission Lines ◽

Closed Loop ◽

Power Transmission ◽

Power Transmission Lines ◽

Closed Loop Systems ◽

Active Shielding

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THE ANALYSIS OF METHODS OF INCREASING OF THE ELECTRICAL POWER TRANSMISSION EFFICIENCY IN 330-750 kV MAIN POWER TRANSMISSION LINES

Scientific bulletin of the Tavria Agrotechnological State University ◽

10.31388/2220-8674-2019-1-21 ◽

2019 ◽

Vol 9 (1) ◽

Author(s):

�. �� ◽

◽

�. �� ◽

Keyword(s):

Transmission Lines ◽

Power Transmission ◽

Electrical Power ◽

Transmission Efficiency ◽

Power Transmission Lines

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Time-Multiplexed Self-Powered Wireless Current Sensor for Power Transmission Lines

Energies ◽

10.3390/en14061561 ◽

2021 ◽

Vol 14 (6) ◽

pp. 1561

Author(s):

Hao Chen ◽

Zhongnan Qian ◽

Chengyin Liu ◽

Jiande Wu ◽

Wuhua Li ◽

...

Keyword(s):

Energy Harvesting ◽

Transmission Line ◽

Transmission Lines ◽

Power Transmission ◽

Current Measurement ◽

Current Sensor ◽

Power Transmission Line ◽

Power Transmission Lines ◽

Current Sensing ◽

Self Powered

Current measurement is a key part of the monitoring system for power transmission lines. Compared with the conventional current sensor, the distributed, self-powered and contactless current sensor has great advantages of safety and reliability. By integrating the current sensing function and the energy harvesting function of current transformer (CT), a time-multiplexed self-powered wireless sensor that can measure the power transmission line current is presented in this paper. Two operating modes of CT, including current sensing mode and energy harvesting mode, are analyzed in detail. Through the design of mode-switching circuit, harvesting circuit and measurement circuit are isolated using only one CT secondary coil, which eliminates the interference between energy harvesting and current measurement. Thus, the accurate measurement in the current sensing mode and the maximum energy collection in the energy harvesting mode are both realized, all of which simplify the online power transmission line monitoring. The designed time-multiplexed working mode allows the sensor to work at a lower transmission line current, at the expense of a lower working frequency. Finally, the proposed sensor is verified by experiments.

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