Reduction of power field radiation for PLC applications

Abstract

In this article, we present our investigations on the radiation of the power-line communication (PLC) system. Power line communication or power line carrier is a technology for carrying data on a conductor usually dedicated to electric power transmission. At high frequency, the power lines, whose are dimensioned and adjusted for electrical energy transfer, not to carry high frequency (HF) data signal, act then as radiating antennas.The system has a number of issues. The primary one is that power lines are inherently subject to a very noisy common mode current. The proliferation of electric, electronic, mobile and wireless devices contribute to increase this noise. The second major issue is the impact of data communication, the range of used frequencies is expected to be between 1 and 30 MHz. Power lines are unshielded and will act as transmitting antennas for the carried digital signals, and as receiving antennas of surrounded radio communications. Unshielded power cables at higher frequencies represent electromagnetic interferences (EMI) sources for existing communication systems that use the same frequency spectrum, such as military communications, hospital communications, radio astronomy, airport navigation systems and radio amateurs.In the sense of new perspective and growing technology, one of the most important aspects pertaining to the environmental electromagnetic compatibility (EMC) is electronic devices safety and human exposure to the radiation of power lines at high frequencies and possible adverse heat effects.The main objective of this paper is to determine rigorously the radiated electromagnetic field for different antenna lengths, different frequencies or wavelengths on near, intermediate and far zones.According to this 3D EMI distribution and to the real geometry of PLC, we propose a practical approach to minimize the radiated power by controlling the frequency band of the PLC system.

Mejoramiento de la técnica ATPM para reducción de interferencia en sistemas de banda ancha por línea de potencia en residencias

“…En un enfoque teórico, Chaaban (2009) analizan una antena de hilo y representan el campo radiado en función de la reducción de la longitud y el radio del conductor de la antena, para demostrar que la potencia radiada es mínima para diferentes valores de longitud. A partir de este resultado se pueden escoger valores de frecuencia óptimos para limitar la potencia electromagnética radiada y, así, reducirla a alrededor de 7.5 dB.…”

Analytical Modeling and Experimental Validation of Electromagnetic Field Radiated by In-house PLC Lines

“…[22]. There has been a lot of theoretical modeling for radiated emissions from PLC systems [23][24][25][26][27][28][29]. Several methods have been used to compute the EM field such as the four-port network method [29], the MoM [28] and the so-called wire grid model [27].…”

Prominent Players of Em Field Radiation and Emission in BPLC Line

“…The radiation level for the band 95 kHz to 148.5 kHz is limited to 116 dBμV for general use and for particular applications such as industrial areas which is limited to 134 dBμV. The frequency range [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] MHz is limited to 30μV/m and 15-80 MHz to 100 μV/m [1] and [2].…”

“…From the previous works on the factor accelerating BPLC radiation, different views have been presented, [9], identifies the presence of common mode (CM) current in the network as a source of BPLC signal radiation, while [10] suggests that any discontinuity, interconnection or bent in powerline network can stand as potential source of BPLC radiation. The authors in [11] have considered BPLC as an antenna radiating when subjected to high frequency signals, describing bent or discontinuity/joints responsible to change high frequency current into EM, and vice versa. Also, [12] suggests that mismatch of impedances causes reflection and retransmission of signal in the network which mount on the signal to radiate with emission which is above the EMC recommended limit.…”