DOCSLIB.ORG

Radio-Frequency Interference (RFI) from Extra-High-Voltage (EHV)

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Radio-Frequency Interference (RFI) from Extra-High-Voltage (EHV) Radio-Frequency Interference (RFI) From Extra-High- Voltage (EHV) Transmission Lines Patrick C. Crane 22 March 2010 1. Introduction The subject of radio-frequency interference (RFI) generated by high-voltage transmission lines has long been of both academic and commercial interest because of concerns about static on AM radio. Today audible noise is of greater concern because many states, counties, and municipalities have noise ordinances and transmission lines are designed to reduce audible noise, while people now expect static on AM radio (Chartier 2009). The subject is of interest today because of the proliferation around the world of low-frequency radio telescopes – including the Low Frequency Array (LOFAR), the Giant Metrewave Radio Telescope (GMRT), the Murchison Widefield Array (MWA), and the Long Wavelength Array (LWA), which is particular interest to the author. The present discussion will concern high-voltage alternating-current (HVAC) transmission lines; high-voltage direct-current (HVDC) transmission lines will be addressed in Appendix A. As described by Pakala and Chartier (1971) power lines are divided into two classes with respect to radio noise: (1) lines with voltages below 70 kV and (2) lines with voltages above 110 kV. Lines in the first class in general exhibit only gap-type discharges and lines in the second class principally exhibit corona discharge. Gap-type discharges are essentially a maintenance issue; corona discharges are a design issue. Extra-high-voltage (EHV) transmission lines have operating voltages of 345 kV or greater. The possibility of interference from such a transmission line first impinged significantly upon radio astronomy (in the United States, at least) in 1984 when the El Paso Electric Company proposed building a 345-kV transmission line from Red Hill, NM to Deming, NM which would run east along US60 to its junction with NM78 (now NM52) and then south along NM78. This route would have crossed both the north and east arms about two miles from the center of the Very Large Array (VLA) radio telescope. In response, the Bureau of Land Management (BLM) hired Vernon L. Chartier of the Bonneville Power Administration (BPA) as a consultant to study the problem and recommend minimum separation distances for the VLA and for the Very Long Baseline Array (VLBA) radio telescope, construction of which began in 1985. Mr. Chartier was well qualified for the task as the Chief High Voltage Phenomena Engineer of BPA’s Division of Laboratories with many years of research in the field. He is still active and when I contacted him ([email protected]), he provided more recent references. Among them is the EPRI Red Book (2008) which is published by the Electric Power Research Institute, Inc. (EPRI); Mr. Chartier sent me the small number of relevant pages because the Red Book sells for $5000. The EPRI is an independent nonprofit 1 organization that conducts research and development relating to the generation, delivery and use of electricity for the benefit of the public. The Red Book (2008) recognizes the BPA method because The most complete empirical method for predicting EMI above 30 MHz is the method developed by the Bonneville Power Administration (Chartier 1983). The BPA method was first developed to predict TVI from overhead lines during rain, but the method has been expanded so that EMI above 30 MHz can be calculated at any frequency, at any distance from the line, at any antenna height, for any bandwidth, and for any detector. Furthermore, it is “the one method that is useful for EMI predictions between 30 and 1000 MHz” and “the most complete empirical method for predicting EMI above 30 MHz.” The BPA model also has been recognized by the International Council on Large Electric Systems (CIGRE, 1996), which is one of the leading worldwide organizations on electric power systems. 2. What Is Corona? Hubbell Power Systems, Inc. (2004) has produced a clear and concise report on corona with the title “What Is Corona?” which is available on the World Wide Web. This report defines corona in the following terms: Corona is a luminous discharge due to ionization of the air surrounding a conductor around which exists a voltage gradient exceeding a certain critical value, based upon IEEE Std 539-1990 (IEEE Corona and Field Effects Subcommittee, 1991) as applied to transmission-line conductors. Or in more physical terms: The corona discharges observed at the surface of a conductor are due to the formation of electron avalanches which occur when the intensity of the electric field at the surface of a conductor exceeds a certain critical value. Furthermore, Any defect on the conductor[,] which projects however slightly above the nominal conductor surface, increases the field intensity in its immediate vicinity...Water drops on the conductor surface provide a multiplicity of projections from which corona discharges can originate...A weathered ACSR conductor generally has a multiplicity of tiny surface defects which project above the nominal surface of the conductor. The presence of corona manifests itself primarily in three ways: 2 1. “Visual corona” – violet-colored light coming from the regions of electrical overstress. Daytime corona cameras and ultraviolet cameras both are used to inspect transmission lines for corona. 2. “Audible corona” – a hissing or frying sound when corona is present. 3. Radio noise – apparently this is the most serious manifestation from the point-of-view of the power company (for radio astronomers, too) because its effects have the longest range. The phenomena associated with corona have been described quantitatively by Chartier (1983): radio noise (RI) over the frequency range 0.1-20 MHz (i.e., AM radio, ham radio); television interference (TVI) over the frequency range 10-1000 MHz, which includes VHF and UHF television and FM radio and, coincidentally, is measured in the radio-astronomy allocation 73.0-74.6 MHz because of the absence of interference; audible noise (AN); and ozone (concentration C). The total power loss per meter of conductor is identified as the corona losses (CL). The presence of more surface defects produces higher levels of corona and related phenomena. Indulkar (2004) discusses the effects of such surface irregularities on the threshold voltage for the onset of corona. He reports that this voltage is directly proportional to an irregularity factor, m0 (0<m0≤1): 1 for smooth, polished, solid, cylindrical conductors; 0.93-0.98 for weathered, solid, cylindrical conductors; 0.87-0.90 for weathered conductors with more than seven strands; and 0.80-0.87 for weathered conductors with up to seven strands. Finally, the Introduction states that corona from EHV transmission lines is primarily a design problem. While that is true – from the point-of-view of a radio astronomer, corona can be a maintenance issue because of such problems as degraded or damaged insulators; contamination with coastal salt, industrial vapors and dust, cement dust, road salt, tire dust and vehicle emissions; agricultural dusts and fertilizers; improper design and/or installation; and loose hardware. 3. Television Interference (TVI) As stated above the method developed by the Bonneville Power Administration (BPA) is the most complete empirical method for predicting radio-frequency interference (RFI) above 30 MHz. The BPA calculation of TVI/phase for a CISPR quasi-peak detector from corona discharge is given by Equation 9.6-4 in EPRI (2008): TVI/phase = 10 + TVIV(E) + TVIS(d) + TVIf + TVIA+ TVID(L), (1) where 3 TVI/phase = electric field (dBμV/m), measured during steady rain with an IEC/CISPRQuasi-Peak (QP) detector with a 1-ms charge time constant, a 550-ms discharge time constant, and 6-dB bandwidth of 120 kHz, for a single phase, E = conductor surface voltage gradient (kV/cm), d = subconductor diameter (cm), f = frequency (MHz), A = altitude above sea level (km), L = distance between antenna and phase (m). Individual terms will be discussed in the following sections. 3.1. Conductor Surface Voltage Gradient TVIV(E) = 120*log(E/16.3), (2) where E = conductor surface voltage gradient (kV/cm). The conductor surface voltage gradient is the single most important factor in determining the corona performance of a high-voltage transmission line. This is indicated by the multiplicative factor of 120 in front of the appropriate (second) term in Equation (1); the multiplicative factors for other terms are 40, 20, and 1. If E changes by a factor of ±2, the TVI will change by ±36 dB. It is so important, also, because its value is entirely a design issue. Therefore, the calculation of its value has long and widely been the subject of investigation. A survey of methods used for such calculations (as of 1979) was published by the IEEE Corona and Field Effects Subcommittee (1979). Seventeen techniques were applied to multiple extra-high-voltage (EHV, ≥345 kV) transmission-line configurations. Empirical techniques were found to agree with exact solutions to within a few percent, so that when applied in the field the overall uncertainty was less than ten percent. A further uncertainty may arise from the definition of the conductor surface voltage gradient; the three definitions used in the survey include the average bundle gradient (A), the average maximum bundle gradient (AM), and the maximum bundle gradient (MB). As a practical matter, Table I of the paper provides parameters for EHV transmission lines with operating voltages of 345 kV, 500 kV, 765 kV, 1100 kV, and 2000 kV (AC) and ±375 kV and ±1000 kV (DC). The computed gradients are listed in Table II. Participant No. 4 is Vernon L. Chartier and he reports only the results of an AM calculation. By 1979, such calculations had migrated to the digital computer and had expanded in capability and complexity. One can see an earlier version of the BPA calculation, suitable for manual calculation, in Pakala and Taylor (1968).
Load more

Recommended publications
  • Safety from Electricity Overhead Power Lines
    SAFETY FROM ELECTRICITY OVERHEAD POWER LINES STEVE GARNETT SAFETY MANAGER NORTHERN POWERGRID Call the national telephone number ‘105’ to automatically connect to your Electricity Distribution Network Operator 2 OVERHEAD POWER LINE INCIDENT STATISTICS Contact with overhead power lines is extremely dangerous And it occurs too often Some are very lucky and escape without injuries But when luck has run out, the consequences are frightening… 5 YEAR PERIOD 2012 – 2016 • Over 3000 Haulage and Transport vehicles reported coming into contact with overhead power lines in the UK • 59 people received injuries IN THE LAST 2 YEARS • 8 people were killed • Death is not always instant 3 OVERHEAD POWER LINE EXAMPLES Typical voltages range from 230 Volts up to 400000 Volts Lines can be bare wire, fully insulated or partially insulated 11000 volts 11000 33000 volts volts 230 volts 275000 volts 4 NOT OVERHEAD POWER LINES ? Overhead power lines can sometimes be very difficult to distinguish from telephone lines BT ? 5 EFFECT OF ELECTRIC SHOCK Electric shock is the effect of current flowing through the body It causes muscle contractions, tissue damage and internal burning It can cause cardiac arrest and respiratory failure JUMP Electricity can jump or ‘flashover’ – you don’t need to touch electrical conductors to draw a current Rubber boots will not protect you 6 ENERGY CREATED BY CONTACT WITH ELECTRICITY NETWORKS The energy created by a network contact is equivalent to at least 30,000 single bar electric fires. To put that in context… The Japanese
    [Show full text]
  • Margonin Wind Farm Non-Technical Summary [EBRD
    1 Non-Technical Executive Summary MARGONIN WIND FARM PROJECT, POLAND 2 Introduction EDP Renovaveis, the worlds fourth largest wind power operator is developing a major wind farm in the central part of Poland - Wielkopolskie Voivodship associated with the construction and development of wind farm projects in the Margonin area by EDP Renovaveis. The aim of this non-technical summary is to ensure that a cumulative assessment of the planned wind farm developments in the region can be presented to enable meaningful public and stakeholders engagement process. Attached to this documents are non-technical resumes which are integral part of the Environmental Impact Assessment Reports which are presented separately. In line with the Polish environmental regulations the need of preparation of an Environmental Impact Assessment is required for this project. General project presentation EDP Renovaveis is a leading international wind power developer, with a number of active wind farms located in the USA, Brazil, Spain, France, Belgium and Portugal. Installed capacity of EDP wind energy increased four-fold between 2005 and 2007, and now the company is among the world top three firms in the world in terms of growth in this sector. As a leading wind developer, the company is committed to guide the business activity in accordance with the sustainable development principles of the EDP Group, including among others: • Efficient use of resources, including the development of cleaner and more efficient energy technology and development of energy generation means based on renewable sources; • Environmental protection with minimization of the environmental impact of all business activities and participation in initiatives that contribute to the conservation of the environment; • Support social development.
    [Show full text]
  • Analysis and Study the Performance of Coaxial Cable Passed on Different Dielectrics
    International Journal of Applied Engineering Research ISSN 0973-4562 Volume 13, Number 3 (2018) pp. 1664-1669 © Research India Publications. http://www.ripublication.com Analysis and Study the Performance of Coaxial Cable Passed On Different Dielectrics Baydaa Hadi Saoudi Nursing Department, Technical Institute of Samawa, Iraq. Email:[email protected] Abstract Coaxial cable virtually keeps all the electromagnetic wave to the area inside it. Due to the mechanical properties, the In this research will discuss the more effective parameter is coaxial cable can be bent or twisted, also it can be strapped to the type of dielectric mediums (Polyimide, Polyethylene, and conductive supports without inducing unwanted currents in Teflon). the cable. The speed(S) of electromagnetic waves propagating This analysis of the performance related to dielectric mediums through a dielectric medium is given by: with respect to: Dielectric losses and its effect upon cable properties, dielectrics versus characteristic impedance, and the attenuation in the coaxial line for different dielectrics. The C: the velocity of light in a vacuum analysis depends on a simple mathematical model for coaxial cables to test the influence of the insulators (Dielectrics) µr: Magnetic relative permeability of dielectric medium performance. The simulation of this work is done using εr: Dielectric relative permittivity. Matlab/Simulink and presents the results according to the construction of the coaxial cable with its physical properties, The most common dielectric material is polyethylene, it has the types of losses in both the cable and the dielectric, and the good electrical properties, and it is cheap and flexible. role of dielectric in the propagation of electromagnetic waves.
    [Show full text]
  • High-Power Energy Scavenging for Portable Devices
    Wright State University CORE Scholar Browse all Theses and Dissertations Theses and Dissertations 2010 High-Power Energy Scavenging for Portable Devices Simon J. Tritschler Wright State University Follow this and additional works at: https://corescholar.libraries.wright.edu/etd_all Part of the Engineering Commons Repository Citation Tritschler, Simon J., "High-Power Energy Scavenging for Portable Devices" (2010). Browse all Theses and Dissertations. 997. https://corescholar.libraries.wright.edu/etd_all/997 This Dissertation is brought to you for free and open access by the Theses and Dissertations at CORE Scholar. It has been accepted for inclusion in Browse all Theses and Dissertations by an authorized administrator of CORE Scholar. For more information, please contact [email protected]. HIGH-POWER ENERGY SCAVENGING FOR PORTABLE DEVICES A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy By SIMON JOSEF TRITSCHLER B.S.E.E., Wright State University, 2001 M.S.Egr., Wright State University, 2003 2010 Wright State University WRIGHT STATE UNIVERSITY SCHOOL OF GRADUATE STUDIES 27 May 2010 I HEREBY RECOMMEND THAT THE DISSERTATION PREPARED UNDER MY SUPERVISION BY Simon Josef Tritschler ENTITLED High-Power Energy Scavenging for Portable Devices BE ACCEPTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF Doctor of Philosophy. ___________________________________ Marian K. Kazimierczuk, Ph.D. Dissertation Director ___________________________________ Ramana V. Grandhi, Ph.D. Director, Ph.D. in Engineering Program Committee on Final Examination ___________________________________ Jack A. Bantle, Ph.D. Vice President for Research and Graduate Studies ___________________________________ and Interim Dean of Graduate Studies Marian K. Kazimierczuk, Ph.D. ___________________________________ Fred D.
    [Show full text]
  • Wireless Power Transmission
    International Journal of Scientific & Engineering Research, Volume 5, Issue 10, October-2014 125 ISSN 2229-5518 Wireless Power Transmission Mystica Augustine Michael Duke Final year student, Mechanical Engineering, CEG, Anna university, Chennai, Tamilnadu, India [email protected] ABSTRACT- The technology for wireless power transfer (WPT) is a varied and a complex process. The demand for electricity is much higher than the amount being produced. Generally, the power generated is transmitted through wires. To reduce transmission and distribution losses, researchers have drifted towards wireless energy transmission. The present paper discusses about the history, evolution, types, research and advantages of wireless power transmission. There are separate methods proposed for shorter and longer distance power transmission; Inductive coupling, Resonant inductive coupling and air ionization for short distances; Microwave and Laser transmission for longer distances. The pioneer of the field, Tesla attempted to create a powerful, wireless electric transmitter more than a century ago which has now seen an exponential growth. This paper as a whole illuminates all the efficient methods proposed for transmitting power without wires. —————————— —————————— INTRODUCTION Wireless power transfer involves the transmission of power from a power source to an electrical load without connectors, across an air gap. The basis of a wireless power system involves essentially two coils – a transmitter and receiver coil. The transmitter coil is energized by alternating current to generate a magnetic field, which in turn induces a current in the receiver coil (Ref 1). The basics of wireless power transfer involves the inductive transmission of energy from a transmitter to a receiver via an oscillating magnetic field.
    [Show full text]
  • Kyoto Energypark
    Environmental Assessment Nov 2008 Kyoto energypark 21. Summary and Justification Page | 403 Summary and Justification Section 21 - Page | 404 Environmental Assessment Nov 2008 21.0 SUMMARY & JUSTIFICATION 21.1 Key Strategic Planning Issues • The Kyoto Energy Park project is a major initiative in providing large-scale renewable power and distribution for the Upper Hunter region. • The Kyoto Energy Park will be a carbon negative project with overall energy payback period of 6 months for wind turbines and approximately 13 months for the Mt Moobi Solar PV farm. This will represent a positive step in the promotion of the use of renewable energy sources. It will help to reverse potentially catastrophic climate change. • Ongoing employment for up to 15 operation and maintenance professionals. • Regional multiplier effects of between 914 and 1595 job years. • Development of a new skills sectors in the renewable energy industry within the Hunter region. • The project combines three proven, commercialised renewable technologies (solar, wind and hydro) Solar PV offers the fastest deployment of any renewable energy technologies today • Renewable technologies integrated in a complementary way to shave expensive peak demand • Flexibility to easily move the peak supply as the peak demand period moves according to seasons • Reduced peak demand resulting in infrastructure and generation savings • Creation of jobs across various fields (e.g. research, installation, project management) during development and construction • Significant ongoing green collar
    [Show full text]
  • Transmission Line Characteristics
    IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-ISSN: 2278-2834, p- ISSN: 2278-8735. PP 67-77 www.iosrjournals.org Transmission Line Characteristics Nitha s.Unni1, Soumya A.M.2 1(Electronics and Communication Engineering, SNGE/ MGuniversity, India) 2(Electronics and Communication Engineering, SNGE/ MGuniversity, India) Abstract: A Transmission line is a device designed to guide electrical energy from one point to another. It is used, for example, to transfer the output rf energy of a transmitter to an antenna. This report provides detailed discussion on the transmission line characteristics. Math lab coding is used to plot the characteristics with respect to frequency and simulation is done using HFSS. Keywords - coupled line filters, micro strip transmission lines, personal area networks (pan), ultra wideband filter, uwb filters, ultra wide band communication systems. I. INTRODUCTION Transmission line is a device designed to guide electrical energy from one point to another. It is used, for example, to transfer the output rf energy of a transmitter to an antenna. This energy will not travel through normal electrical wire without great losses. Although the antenna can be connected directly to the transmitter, the antenna is usually located some distance away from the transmitter. On board ship, the transmitter is located inside a radio room and its associated antenna is mounted on a mast. A transmission line is used to connect the transmitter and the antenna The transmission line has a single purpose for both the transmitter and the antenna. This purpose is to transfer the energy output of the transmitter to the antenna with the least possible power loss.
    [Show full text]
  • A Novel Single-Wire Power Transfer Method for Wireless Sensor Networks
    energies Article A Novel Single-Wire Power Transfer Method for Wireless Sensor Networks Yang Li, Rui Wang * , Yu-Jie Zhai , Yao Li, Xin Ni, Jingnan Ma and Jiaming Liu Tianjin Key Laboratory of Advanced Electrical Engineering and Energy Technology, Tiangong University, Tianjin 300387, China; [email protected] (Y.L.); [email protected] (Y.-J.Z.); [email protected] (Y.L.); [email protected] (X.N.); [email protected] (J.M.); [email protected] (J.L.) * Correspondence: [email protected]; Tel.: +86-152-0222-1822 Received: 8 September 2020; Accepted: 1 October 2020; Published: 5 October 2020 Abstract: Wireless sensor networks (WSNs) have broad application prospects due to having the characteristics of low power, low cost, wide distribution and self-organization. At present, most the WSNs are battery powered, but batteries must be changed frequently in this method. If the changes are not on time, the energy of sensors will be insufficient, leading to node faults or even networks interruptions. In order to solve the problem of poor power supply reliability in WSNs, a novel power supply method, the single-wire power transfer method, is utilized in this paper. This method uses only one wire to connect source and load. According to the characteristics of WSNs, a single-wire power transfer system for WSNs was designed. The characteristics of directivity and multi-loads were analyzed by simulations and experiments to verify the feasibility of this method. The results show that the total efficiency of the multi-load system can reach more than 70% and there is no directivity. Additionally, the efficiencies are higher than wireless power transfer (WPT) systems under the same conductions.
    [Show full text]
  • 2014 Electric Reliability Plan (For Information & Discussion Only)
    LOS ALAMOS COUNTY DEPARTMENT OF PUBLIC UTILITIES 2014 ELECTRIC RELIABILITY PLAN (FOR INFORMATION & DISCUSSION ONLY) Rafael De La Torre, PE Deputy Utility Manager, Electric Distribution November 19, 2014 1 2 TABLE OF CONTENTS .................................................................................................................................... 1 Executive Summary .................................................................................................... 5 I. System Overview: ................................................................................................. 7 Los Alamos Power Pool ........................................................................................... 7 Los Alamos Transmission System ........................................................................... 7 LACU Distribution System ....................................................................................... 8 II. Description of Relevant Systems and Impact on Reliability ............................. 10 The Regional Transmission Grid: ........................................................................... 10 The Local Transmission Grid: ................................................................................ 13 The Local Distribution Grid: ................................................................................... 14 Analysis of Performance Measures ....................................................................... 17 SAIDI Comparison with Nearby Utilities ................................................................
    [Show full text]
  • Introduction to Transmission Lines
    INTRODUCTION TO TRANSMISSION LINES DR. FARID FARAHMAND FALL 2012 http://www.empowermentresources.com/stop_cointelpro/electromagnetic_warfare.htm RF Design ¨ In RF circuits RF energy has to be transported ¤ Transmission lines ¤ Connectors ¨ As we transport energy energy gets lost ¤ Resistance of the wire à lossy cable ¤ Radiation (the energy radiates out of the wire à the wire is acting as an antenna We look at transmission lines and their characteristics Transmission Lines A transmission line connects a generator to a load – a two port network Transmission lines include (physical construction): • Two parallel wires • Coaxial cable • Microstrip line • Optical fiber • Waveguide (very high frequencies, very low loss, expensive) • etc. Types of Transmission Modes TEM (Transverse Electromagnetic): Electric and magnetic fields are orthogonal to one another, and both are orthogonal to direction of propagation Example of TEM Mode Electric Field E is radial Magnetic Field H is azimuthal Propagation is into the page Examples of Connectors Connectors include (physical construction): BNC UHF Type N Etc. Connectors and TLs must match! Transmission Line Effects Delayed by l/c At t = 0, and for f = 1 kHz , if: (1) l = 5 cm: (2) But if l = 20 km: Properties of Materials (constructive parameters) Remember: Homogenous medium is medium with constant properties ¨ Electric Permittivity ε (F/m) ¤ The higher it is, less E is induced, lower polarization ¤ For air: 8.85xE-12 F/m; ε = εo * εr ¨ Magnetic Permeability µ (H/m) Relative permittivity and permeability
    [Show full text]
  • Recommendations for Transmitter Site Preparation
    RECOMMENDATIONS FOR TRANSMITTER SITE PREPARATION IS04011 Original Issue.................... 01 July 1998 Issue 2 ..............................11 May 2001 Issue 3 ................... 22 September 2004 Nautel Limited 10089 Peggy's Cove Road, Hackett's Cove, NS, Canada B3Z 3J4 T.+1.902.823.2233 F.+1.902.823.3183 [email protected] U.S. customers please contact: Nautel Maine, Inc. 201 Target Industrial Circle, Bangor ME 04401 T.+1.207.947.8200 F.+1.207.947.3693 [email protected] e-mail: [email protected] www.nautel.com Copyright 2003 NAUTEL. All rights reserved. THE INFORMATION PRESENTED IN THIS DOCUMENT IS BELIEVED TO BE ACCURATE AND RELIABLE. IT IS INTENDED TO AUGMENT COMPETENT SITE ENGINEERING. IF THERE IS A CONFLICT BETWEEN THE RECOMMENDATIONS OF THIS DOCUMENT AND LOCAL ELECTRICAL CODES, THE REQUIREMENTS OF THE LOCAL ELECTRICAL CODE SHALL HAVE PRECEDENCE. Table of Contents 1 INTRODUCTION 1.1 Potential Threats 1.2 Advantages 2 LIGHTNING THREATS 2.1 Air Spark Gap 2.2 Ground Rods 2.2.1 Ground Rod Depth 2.3 Static Drain Choke 2.4 Static Drain Resistors 2.5 Series Capacitors 2.6 Single Point Ground 2.7 Diversion of Transients on RF Feed Coaxial Cable 2.8 Diversion/Suppression of Transients on AC Power Wiring 2.9 Shielded Isolation Transformer 3 ELECTROMAGNETIC SUSCEPTIBILITY 3.1 Shielded Building 3.2 Routing of RF Feed Coaxial Cable 3.3 Ferrites for Rejection of Common Mode Signals 3.4 EMI Filters 3.5 AC Power Sources Not Recommended for Use 4 HIGH VOLTAGE BREAKDOWN CONCERNS 4.1 RF Transmission Systems 4.2 High Voltage Feed Throughs 4.2.1 Insulator
    [Show full text]
  • Case 2:14-Cv-01781-SSV-KWR Document 26 Filed 03/12/15 Page 1 of 10
    Case 2:14-cv-01781-SSV-KWR Document 26 Filed 03/12/15 Page 1 of 10 UNITED STATES DISTRICT COURT EASTERN DISTRICT OF LOUISIANA WALTON CONSTRUCTION – A CORE CIVIL ACTION COMPANY, LLC, VERSUS NO: 14-1781 FIRST FINANCIAL INSURANCE COMPANY SECTION: R(2) ORDER AND REASONS This insurance coverage dispute concerns a commercial general liability policy issued by defendant First Financial Insurance Company. Plaintiff Walton Construction seeks a declaration that the policy affords it "additional insured" coverage in an underlying state court tort suit. First Financial seeks a declaration that it has no duty to defend or indemnify Walton. The parties have filed cross motions for summary judgment.1 For the following reasons, the Court denies Walton's motion and grants First Financial's motion. I. BACKGROUND This insurance coverage dispute arises out of a personal injury lawsuit brought by John Maestri against Entergy Louisiana, LLC, in Louisiana state court. Only a few facts are necessary to understand the underlying suit. Entergy is a power company. Maestri worked in construction for A-1 Glass Service, Inc., a 1 R. Doc. 9 (First Financial); R. Doc. 14 (Walton). Case 2:14-cv-01781-SSV-KWR Document 26 Filed 03/12/15 Page 2 of 10 commercial glazier. A-1 worked as a subcontractor to Walton on a construction project for the Jefferson Parish School Board. In March 2012, while Maestri was installing glass as part of that project, an Entergy high-voltage power line electrocuted him, burning his arms, chest, and hands. Maestri sued Entergy for his injuries. After Maestri sued Entergy, Entergy filed a third-party complaint against A-1 and Walton, alleging that the companies had violated the Louisiana Overhead Power Line Safety Act, La.
    [Show full text]