Power Line

Many studies have been developed aiming to improve digital filters realizations, recurring to intricate structures and analysing the errors behaviour. The work presented in this paper analyses the feasibility of fixed- point implementation of classical IIR notch filters (Butterworth, Chebyshev, Bessel and elliptic), and also the effect of the quality factor and normalized cut -off frequency in the number of significant bits necessa ry to represent the coefficients, to scrutinize the defor mations the filters suffer for distinct design specificatio ns. The work focuses especially in the implementation o f power line notch filters used to improve the signal -to- noise ratio in biomedical signals. The obtained res ults, when quantizing the digital notch filters, show tha t by applying second order sections decomposition, low-o rder digital filters may be designed using only part of double precision capabilities, while high-order notch filt ers with harsh design constrains are implement...

This paper presents the use of artificial neural ne tworks (ANN) to estimate electric fields around an overhead power transmission line. Although there ex ist many efficient numerical methods, e.g. finite difference method (FDM), finite element method (FEM), boundary element method (BEM), etc, to estimate electric field distribution caused by live conducto rs, it typically consumes substantial execution tim e

This paper presents an adaptive gain-scheduled backstepping control (AGSBC) scheme for the balance control of an underactuated mechanical power-line inspection (PLI) robotic system with two degrees of freedom and a single control input. First, a nonlinear dynamic model of the balance adjustment process of the PLI robot is constructed, and then the model is linearized at a nominal equilibrium point to overcome the computational infeasibility of the conventional backstepping technique. Second, to solve generalized stabilization control issue for underactuated systems with multiple equilibrium points, an equilibrium manifold linearized model is developed using a scheduling variable, and then a gain-scheduled backstepping control (GSBC) scheme for expanding the operational area of the controlled system is constructed. Finally, an adaptive mechanism is proposed to counteract the impact of external disturbances. The robust stability of the closed-loop system is ensured by Lyapunov theorem. Simulation results demonstrate the effectiveness and high performance of the proposed scheme compared with other control schemes.

High-k MIM capacitor, compatible with Cu-BEOL, is developed for reduction of power-line noises in high-speed MPUs. In order to achieve high capacity as well as low leakage current at higher temperature, a binary composite oxide of TaZrO, mixing a high permittivity oxide and a low electron affinity one, is applied to the capacitor dielectric. Besides the material design, the fully-flat plug-in plate (PiP) structure on the Cu-interconnects is introduced to reduce the parasitic resistance of the capacitor plate along with the low leakage current. Combination of the TaN PiP with TaZrO is a significant feature for decoupling devices of power delivery systems in the high performance MPUs

In last years optimal allocation of active power line conditioner (APLC) at industrial facilities has become an important research subject. In this work the genetic algorithms (GA) are used to determine the allocation and sizing of APLCs. This methodology is implemented in ATP (alternative transients program), and particularly with its components called ATP models routines. The main topic of the paper is to illustrate the process used to achieve the implementation of GA with these components using ATP foreign functions. The structure of chromosome, the genetic operators and a novel concept of ATP models networks are described. The approach proposed is applied on an 11 bus test system, illustrating the minimization of voltage distortion at PCC (point coupling common) and the current harmonic injection of APLCs

In power line or any cable communications, impulsive noise is assumed to be the most difficult noise to filter. In particular, it is impossible to predict when a non periodic asynchronous impulsive noise will appear. So, under such noise conditions, the OFDM symbol generally used in PLC, is corrupted. Signal-to-noise ratio is generally improved by detecting and/or filtering such noise

This paper describes the underlying basis for guidance on the protection of nuclear power systems from direct lightning strikes to facilities and resulting transient effects. Oak Ridge National Laboratory has been engaged by the U.S. Nuclear Regulatory Commission Office of Nuclear Regulatory Research to develop a technical basis for guidance to address design and implementation practices for lightning protection systems

Alexis is the product of miscegenation. Her mother is White and her father is Black. Her appearance blends both races so that, at a glance, she might be described as light brown with slim, European facial features. Growing up, Alexis faced many stereotypical ...

Power line communication (PLC) is a recent and rapidly evolving technology using the existing electricity power lines for data transmissions at high rates (higher than 1 Mbit/s). As these lines have not been designed for high data rate transmissions, they will produce unintentional radio frequency emissions that may adversely cause high interferences in a wider frequency range than their own bandwidth (due to frequency harmonics and the statistical properties of noise like interference). Digital subscriber line technology is currently used to deliver high data rates to users that are using the existing telephone lines. The lines of the two networks (the electricity power distribution and the telephone) are found close to each other in residential places and offices (sometimes in the same duct). Therefore, service providers are concerned about the influence of the PLC transmission on the delivery of services over VDSL2, where the two technologies overlap in frequency range. In this p...

It is shown that electrical fast transients (EFT) on the AC power line can result in electrical overstress (EOS) damage to a Class 0 ESD sensitive device connected to the output of AC powered equipment. A methodology for measuring EFT and EOS transients is described and simulations are used to understand coupling mechanisms. Finally, several techniques for reduction of the EOS transient are tested and analyzed.

This article constitutes an overview of the research, application, and regulatory activities on power line communications. Transmission issues on the power line are investigated and modeling approaches illustrated. Contemporary communication techniques and reliability issues are treated. A description of regulatory activities worldwide is given. Finally, market perspectives and promising applications are covered to assess the viability of this communications environment.

This paper describes the design and implementation of the grounding and shielding system for the ATLAS SemiConductor Tracker (SCT). The mitigation of electromagnetic interference and noise pickup through power lines is the critical design goal as they have the potential to jeopardize the electrical performance. We accomplish this by adhering to the ATLAS grounding rules, by avoiding ground loops and

This paper describes the underlying basis for guidance on the protection of nuclear power systems from direct lightning strikes to facilities and resulting transient effects. Oak Ridge National Laboratory has been engaged by the U.S. Nuclear Regulatory Commission Office of Nuclear Regulatory Research to develop a technical basis for guidance to address design and implementation practices for lightning protection systems in nuclear power plants (NPPs). Lightning protection is becoming increasingly important given the use of digital and low-voltage-analog systems in NPPs. Although these modern systems have advantages and useful features, they have the potential to be more vulnerable than older, analog systems to the power surges and electromagnetic interference that result when lightning strikes facilities or power lines.

Submitted for the DFD10 Meeting of The American Physical Society Characterization of hydrophobic and hydrophilic coatings as deicing and anti-icing AKIHITO AOKI, Kogakuin University, KATSUAKI MORITA, University of Tokyo, AKIHISA KONNO, Kogakuin University, HIROTAKA SAKAUE, JAXA — Anti-icing is necessary in various fields, such as aeronautics, roads, power lines, ships, and architectures. Deicing fluids, and sometimes hot water, work to prevent from icing. Due to environmental issue, deicing fluids are not always welcome to use. We study hydrophobic and hydrophilic coatings for anti-icing. By coating these to a target surface, it prevents icing without damaging the environment. We present a characterization method of hydrophobic and hydrophilic coatings for deicing and anti-icing. We provide a temperature-control room to create an icing condition, such as -10 to 0 degrees C. Under the controlled room, the contact angle measurement as well as the force measurement is employed. Total 1...