Electromagnetic interference from transmission lines located in central region of Saudia Arabia

1989 ◽  
Vol 4 (1) ◽  
pp. 532-538 ◽  
Author(s):  
A.A. Al-Arainy ◽  
N.H. Malik ◽  
L.N. Abdul-Aal
Keyword(s):  
Central Region ◽  
Transmission Lines ◽  
Electromagnetic Interference

Study of Blind Source Separation on Transmission Line EMI

2013 ◽  
Vol 846-847 ◽  
pp. 493-499
Author(s):  
Zi Hua Li ◽  
Chun Yan Xiao ◽  
Shuai Gao
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Electromagnetic Interference ◽  
Electromagnetic Compatibility ◽  
Spectral Characteristics ◽  
Separation Performance ◽  
Fast Independent Component Analysis ◽  
Fastica Algorithm ◽  
Interference Signals ◽  
Emc Design

The transmission line is an important part of electrical system. Electromagnetic interference (EMI) signals can be picked up by transmission lines in a way of conduction or radiation, and interfere the sensitive devices located in the power source end and the load end, so it is important and necessary to separate and identify the EMI source signals coupling to the transmission lines in order to guide the electromagnetic compatibility (EMC) design and the further EMI diagnosis and suppression. Fast independent component analysis (FastICA) algorithm is studied and programmed, and its feasibility and separation performance are validated via simulation of BSS of three mixed signals and the average signals to interference ratio (SIR) is approximately 30 dB. The model of crosstalk of transmission lines is built and simulated, the interference signals are separated by the FastICA algorithm, and the average SIR is over 20 dB. Periodicity and spectral characteristics of the separated interference signals are analyzed, and the identification of interference signals is realized.

Frequency Characterization of Ferrite Beads in the Microwave Range for Nonlinear Applications

2014 ◽  
Vol 802 ◽  
pp. 552-557
Author(s):  
Lauro Paulo Silva Neto ◽  
J.O. Rossi ◽  
P.A.G. Dias ◽  
J.J. Barroso
Keyword(s):  
Transmission Lines ◽  
Electromagnetic Interference ◽  
Nonlinear Behavior ◽  
Complex Permeability ◽  
Microwave Range ◽  
Limited Information ◽  
Low Frequencies ◽  
High Power Microwave ◽  
Low Pass ◽  
Low Pass Filters

Ferrite beads are ferromagnetic materials that exhibit a small inductance at low frequencies, becoming resistive at high frequencies. These devices are used as low pass filters for reducing electromagnetic interference (EMI) in communications and power electronics because the resistive losses attenuate the undesired frequencies. As ferrite beads have a nonlinear behavior with current and frequency they have been used in nonlinear transmission lines (NLTLs) for high power microwave generation in space and defense applications. In this work, high frequency ferrite beads are characterized in the frequency range up to 1 GHz by measuring S11 reflection parameter in order to calculate their complex permeability and losses, key parameters in the design of NLTLs. In addition, X-ray diffraction (XRD) is used to identify their chemical element composition. Finally, the motivation for this work is basically due to the limited information on ferrite materials provided by the manufacturers.

Electromagnetic Interference Measurements at 900 MHZ on 230-KV and 500-KV Transmission Lines

1986 ◽  
Vol 1 (2) ◽  
pp. 140-149 ◽  
Author(s):  
V. L. Chartier ◽  
R. Sheridan ◽  
J. N. DiPlacido ◽  
M. O. Loftness
Keyword(s):  
Transmission Lines ◽  
Electromagnetic Interference ◽  
Interference Measurements

Application of Fiber Bragg Grating Device in Icing Monitoring System of Transmission Lines

2014 ◽  
Vol 543-547 ◽  
pp. 1030-1034 ◽  
Author(s):  
Feng Lian Liu ◽  
Li Rui Guo ◽  
Yuan Shi Deng ◽  
Chi Wu ◽  
Jiang Ling Li ◽  
...  
Keyword(s):  
Transmission Line ◽  
Fiber Bragg Grating ◽  
Transmission Lines ◽  
Electromagnetic Interference ◽  
Bragg Grating ◽  
Stable Operation ◽  
Monitoring Device ◽  
Active Sensors ◽  
Bragg Grating Sensor ◽  
Monitoring Devices

Ice accretion has been a huge threat for the stable operation of transmission line. Icing monitoring devices used presently are active sensors with low working stability. Signals are transmitted in the electrical form, which are easily affected by the electromagnetic interference. In this paper, an online icing monitoring device of transmission line based on fiber bragg grating (FBG) sensor is designed, and is operated as a pilot unit on the 44# tower of 110kV Zhenzou line. Experimental results show that the online icing monitoring device operates stably, and the designed fiber bragg grating sensor has high linearity, good sensitivity and high accuracy.

scholarly journals Electromagnetic interference in a multiconductor transmission system – MTL

2019 ◽  
Vol XXII (2) ◽  
pp. 343-351
Author(s):  
Ciocioi I.
Keyword(s):  
Transmission Lines ◽  
Electromagnetic Interference ◽  
Printed Circuit Boards ◽  
Electronic Circuit ◽  
Electromagnetic Coupling ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Different Types ◽  
Correct Function ◽  
Coupling Phenomena

In electrical and electronic practice, many connection and transmission elements (cables) are used as a multi-conductor transmission lines (MTL). The electromagnetic fields existing in the environment of these multiconductor transmission lines and can generate different types of coupling phenomena, causing EMC problems by the appearance of the unwanted EMI, disturbing the correct function and altering the information. Electromagnetic coupling between the circuits/cables of a circuit (also known as crosstalk) can also occur between the signal and power paths of an assembly made on printed circuit boards, PCB (printed board circuit), so it is important that when designing such an electrical / electronic circuit, these aspects should be taken into account.

scholarly journals Analysis of passive interference on radio station from AC UHV power

2018 ◽  
Vol 64 ◽  
pp. 05002
Author(s):  
Zheyuan GAN ◽  
Jiangong ZHANG ◽  
Jun ZHAO ◽  
ying Lu
Keyword(s):  
Transmission Lines ◽  
Electromagnetic Interference ◽  
Detection Performance ◽  
Radio Station ◽  
Secondary Radiation ◽  
Surface Reflection ◽  
Shadowing Effect ◽  
Passive Interference ◽  
Uhv Transmission Lines

The problems of Electromagnetic Interference in Airborne Intelligence Radar Stations near the AC UHV Transmission Lines is researched in this paper, which is mainly passive interference. And then analyzed the passive interference of AC UHV lines. It mainly studied the influence of the tower and line on the distance detection performance of the air-to-air intelligence radar of the UHV transmission lines. and integrated the influence of the surface reflection surface, the shadowing effect and the secondary radiation echo interference, Proposed a passive interference protection distance for UHV transmission lines and airborne intelligence radar stations

scholarly journals Simulation of Electromagnetic Coupling on Pipelines close to Overhead Transmission Lines: A Parametric Study

2017 ◽  
Vol 1 (2) ◽  
pp. 116 ◽  
Author(s):  
A. H. Al-Badi ◽  
H. M. Al-Rizzo
Keyword(s):  
Transmission Lines ◽  
Electromagnetic Interference ◽  
Electromagnetic Coupling ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Separation Distance ◽  
Interference Effects ◽  
Voltage Level ◽  
Oil Pipelines ◽  
Water Gas

Electromagnetic interference effects caused by electric power lines on neighboring metallic utilities such as water, gas or oil pipelines became a major concern due tosignificant increase in the load and short circuit current levels needed to satisfy the load requirements. Another reason for increased interference levels originates from the environmental concerns, which impose on various utilities the obligation to share common corridors. This paper presents three different scenarios of a pipeline in which all types of electromagnetic interferences (coupling) will be investigated and their effects on the pipeline will be predicted. The level of the calculated voltage, owing to each type of coupling, depends on different factors (voltage level, length of parallelism, separation distance, soil resistivity, load current magnitude and pipeline coating). The effects of these factors are discussed; some factors such as the fault current level, separation distance and soil resistivities are found to exhibit a large influence on the pipeline voltage. To the best of the authors’ knowledge, the comprehensive analyses presented in this paper considering all types of interferences have not yet been publishedelsewhere.

scholarly journals Modeling and Fabrication of a Reconfigurable RF Output Stage for Nanosatellite Communication Subsystems

Electronics ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 149
Author(s):  
Jose L. Alvarez-Flores ◽  
Jorge Flores-Troncoso ◽  
Leonel Soriano-Equigua ◽  
Jorge Simón ◽  
Joel A. Castillo ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Electromagnetic Interference ◽  
Software Defined Radio ◽  
Satellite Communication ◽  
Small Satellite ◽  
Output Stage ◽  
Communication Subsystems ◽  
Baseband Processor ◽  
Processing Control ◽  
Space Segment

Current small satellite platforms such as CubeSats require robust and versatile communication subsystems that allow the reconfiguration of the critical operating parameters such as carrier frequency, transmission power, bandwidth, or filter roll-off factor. A reconfigurable Analog Back-End for the space segment of a satellite communication subsystem is presented in this work. This prototype is implemented on a 9.5 cm2 6-layer PCB, and it operates from 0.070 to 6 GHz and complies with CubeSat and IPC-2221 standards. The processing, control, and synchronizing stages are carried out on a Software-Defined Radio approach executed on a baseband processor. Results showed that the signal power at the output of the proposed Analog Back-End is suitable for feeding the following antenna subsystem. Furthermore, the emitted radiation levels by the transmission lines do not generate electromagnetic interference.

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