Environmental, Health, and Safety Guidelines for Electric Power Transmission and Distribution
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Specifying HV/MV Transformers at Large Sites for an Optimized MV Electrical Network
Specifying HV/MV Transformers at Large Sites for an Optimized MV Electrical Network White Paper 258 Revision 0 by Juan Tobias Daniel Radu Philippe Dogny Jean-Luc Belletto Executive summary Generally, large industrial site designs use standard specifications of the HV/MV transformer which leads to oversizing and a higher cost of the MV primary and secondary electrical distribution system. This paper introduces the factors to consider when specifying the HV/MV transformer and raises awareness of the impact of short circuit impedance (zt) on the cost of the HV/MV transformer and the MV electrical distribution installa- tion (MV switchgear and cabling). Finally, a case study of a large date center is presented to show how a reduction in the total cost of ownership (TCO) can be achieved. NOTE: this technical white paper is aimed at electrical engineers who are specifying HV/MV transformers for large industrial and data center sites. Schneider Electric – Data Center Science Center White Paper 258 Rev 0 2 Electrical utilities use four types of networks topologies to deliver electrical energy Introduction to the different types of load centers. The main network characteristics are pre- sented in Table 1. Table 1 Network characteristics of the four utility network topologies used to deliver energy to load centers Nominal Voltage Main Typical Network Type Function (typical range) topology Availability Extra High Voltage Transport bulk power over long 800kV < Un < 220kV Meshed 99.99999% (EHV) transmission distances Distribute power to main consump- -
High Voltage Direct Current Transmission – Proven Technology for Power Exchange
www.siemens.com/energy/hvdc High Voltage Direct Current Transmission – Proven Technology for Power Exchange Answers for energy. 2 Contents Chapter Theme Page 1 Why High Voltage Direct Current? 4 2 Main Types of HVDC Schemes 6 3 Converter Theory 8 4 Principle Arrangement of an HVDC Transmission Project 11 5 Main Components 14 5.1 Thyristor Valves 14 5.2 Converter Transformer 18 5.3 Smoothing Reactor 20 5.4 Harmonic Filters 22 5.4.1 AC Harmonic Filter 22 5.4.2 DC Harmonic Filter 25 5.4.3 Active Harmonic Filter 26 5.5 Surge Arrester 28 5.6 DC Transmission Circuit 31 5.6.1 DC Transmission Line 31 5.6.2 DC Cable 32 5.6.3 High Speed DC Switches 34 5.6.4 Earth Electrode 36 5.7 Control & Protection 38 6 System Studies, Digital Models, Design Specifications 45 7 Project Management 46 3 1 Why High Voltage Direct Current? 1.1 Highlights from the High Voltage Direct In 1941, the first contract for a commercial HVDC Current (HVDC) History system was signed in Germany: 60 MW were to be supplied to the city of Berlin via an underground The transmission and distribution of electrical energy cable of 115 km length. The system with ±200 kV started with direct current. In 1882, a 50-km-long and 150 A was ready for energizing in 1945. It was 2-kV DC transmission line was built between Miesbach never put into operation. and Munich in Germany. At that time, conversion between reasonable consumer voltages and higher Since then, several large HVDC systems have been DC transmission voltages could only be realized by realized with mercury arc valves. -
Plasma Physics 1 APPH E6101x Columbia University Fall, 2015
Lecture22: Atmospheric Plasma Plasma Physics 1 APPH E6101x Columbia University Fall, 2015 1 http://www.plasmatreat.com/company/about-us.html 2 http://www.tantec.com 3 http://www.tantec.com/atmospheric-plasma-improved-features.html 4 5 6 PHYSICS OF PLASMAS 22, 121901 (2015) Preface to Special Topic: Plasmas for Medical Applications Michael Keidar1,a) and Eric Robert2 1Mechanical and Aerospace Engineering, Department of Neurological Surgery, The George Washington University, Washington, DC 20052, USA 2GREMI, CNRS/Universite d’Orleans, 45067 Orleans Cedex 2, France (Received 30 June 2015; accepted 2 July 2015; published online 28 October 2015) Intense research effort over last few decades in low-temperature (or cold) atmospheric plasma application in bioengineering led to the foundation of a new scientific field, plasma medicine. Cold atmospheric plasmas (CAP) produce various chemically reactive species including reactive oxygen species (ROS) and reactive nitrogen species (RNS). It has been found that these reactive species play an important role in the interaction of CAP with prokaryotic and eukaryotic cells triggering various signaling pathways in cells. VC 2015 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4933406] There is convincing evidence that cold atmospheric topic section, there are several papers dedicated to plasma plasmas (CAP) interaction with tissue allows targeted cell re- diagnostics. moval without necrosis, i.e., cell disruption. In fact, it was Shashurin and Keidar presented a mini review of diag- determined that CAP affects cells via a programmable pro- nostic approaches for the low-frequency atmospheric plasma cess called apoptosis.1–3 Apoptosis is a multi-step process jets. -
Advanced Transmission Technologies
Advanced Transmission Technologies December 2020 United States Department of Energy Washington, DC 20585 Executive Summary The high-voltage transmission electric grid is a complex, interconnected, and interdependent system that is responsible for providing safe, reliable, and cost-effective electricity to customers. In the United States, the transmission system is comprised of three distinct power grids, or “interconnections”: the Eastern Interconnection, the Western Interconnection, and a smaller grid containing most of Texas. The three systems have weak ties between them to act as power transfers, but they largely rely on independent systems to remain stable and reliable. Along with aged assets, primarily from the 1960s and 1970s, the electric power system is evolving, from consisting of predominantly reliable, dependable, and variable-output generation sources (e.g., coal, natural gas, and hydroelectric) to increasing percentages of climate- and weather- dependent intermittent power generation sources (e.g., wind and solar). All of these generation sources rely heavily on high-voltage transmission lines, substations, and the distribution grid to bring electric power to the customers. The original vertically-integrated system design was simple, following the path of generation to transmission to distribution to customer. The centralized control paradigm in which generation is dispatched to serve variable customer demands is being challenged with greater deployment of distributed energy resources (at both the transmission and distribution level), which may not follow the traditional path mentioned above. This means an electricity customer today could be a generation source tomorrow if wind or solar assets were on their privately-owned property. The fact that customers can now be power sources means that they do not have to wholly rely on their utility to serve their needs and they could sell power back to the utility. -
Power Grid Failure
Power grid failure Presentation by: Sourabh Kothari Department of Electrical Engineering, CDSE Introduction • A power grid is an interconnected network of transmission lines for supplying electricity from power suppliers to consumers. Any disruptions in the network causes power outages. India has five regional grids that carry electricity from power plants to respective states in the country. • Electric power is normally generated at 11-25kV and then stepped-up to 400kV, 220kV or 132kV for high voltage lines through long distances and deliver the power into a common power pool called the grid. • The grid is connected to load centers (cities) through a sub- transmission network of normally 33kV lines which terminate into a 33kV (or 66kV) substation, where the voltage is stepped-down to 11kV for power distribution through a distribution network at 11kV and lower. • The 3 distinct operation of a power grid are:- 1. Power generation 2. Power transmission 3. Power distribution. Structure of Grids Operations of Power grids • Electricity generation - Generating plants are located near a source of water, and away from heavily populated areas , are large and electric power generated is stepped up to a higher voltage-at which it connects to the transmission network. • Electric power transmission - The transmission network will move the power long distances–often across state lines, and sometimes across international boundaries, until it reaches its wholesale customer. • Electricity distribution - Upon arrival at the substation, the power will be stepped down in voltage—to a distribution level voltage. As it exits the substation, it enters the distribution wiring. Finally, upon arrival at the service location, the power is stepped down again from the distribution voltage to the required service voltage. -
Lightning on Transmission Line of the Harm and Prevention Measures
Lightning on transmission lines hazards and Prevention Measures Wang Qinghao, Ge Changxin, Xue Zhicheng, Sun Fengwei, Wu Shaoyong, Li Zhixuan, Shi Dongpeng, Ren Hao, Li Jinye, Ma Hui, Cao Feiyi Fushun Power Supply Company, Liaoning Electric Power Company Limited, State Grid, China, [email protected] Keywords: power transmission line, lightning hazard, prevention measures Abstract. Through the analysis of lightning to the harmfulness of the power transmission line, puts forward the specific measures to prevent lightning accidents, improving insulation, installing controllable discharge lightning rod, reducing the tower grounding resistance, adding coupling ground wire and the proper use of send arrester electrical circuit transmission line. And take on the unit measures nearly were compared, statistics and analysis. Introduction Lightning accident is always an important factor affecting the reliability of the power supply of the electric line to send. Because of the randomness and complexity of lightning activity in the atmosphere, currently the world's research on knowledge transmission line lightning and many unknown elements. Lightning accident of overhead power transmission line is always a problem of safe power supply, lightning accidents accounted for almost all the accidents of 1/2 or more line. Therefore, how to effectively prevent lightning, lightning damage reduced to more and more by transmission line of the relevant personnel to pay attention[1-2]. At present, the measures of lightning protection of transmission line itself mainly rely on the erection of the overhead ground wire of the tower top, its operation and maintenance work is mainly on the detection and reconstruction of tower grounding resistance. Due to its single lightning protection measures, can not well meet the requirements of lightning protection. -
Compact High Voltage Electric Power Transmission
Compact High Voltage Electric Power Transmission By Dennis Woodford, P.Eng. [email protected] January 3, 2014 Introduction There is a developing need to provide high voltage electric power transmission that minimizes impact on the environment, agriculture and communities. Overhead transmission lines have been the normal located on designated rights-of-way. Acquiring new right-of way for overhead ac transmission lines is usually challenging to permit and in some jurisdiction impossible to obtain. To minimize the adverse effects of high voltage electric power transmission lines, new technologies are forthcoming that when applied may be more acceptable. By judicious compacting of high voltage direct current (HVDC) and high voltage alternating current (HVAC) transmission systems, existing rights-of-way can be utilized, such as along roads or rail lines. A concept for compacting transmission lines for this purpose is presented. Note: Portions or all of this paper may be copied, quoted or referred to so long as Electranix Corporation is acknowledged. Electranix Corporation, 12 – 75 Scurfield Blvd, Winnipeg, MB R3Y 1G4, Canada. www.electranix.com Compacting HVDC Transmission A new technology to convert HVAC power to HVDC power and vice versa is being successfully applied throughout the world enabling use of HVDC transmission. These converters apply large power transistors in what are designated voltage sourced converters (VSC) enabling VSC transmission. One popular configuration of voltage sourced converters is termed “symmetrical monopoles.” When a converter station has two symmetrical monopoles, it is not unlike the more conventional configuration of a “bipole” which also has two poles. When a bipole is rated at ±500 kV, it has two poles, each 500 kV and grounded at one end so that the generated HVDC line voltage has one polarity positive and the other polarity negative. -
1 Bus Bar, Split Bus Bar System, Special Purpose Cables. Electrical Diagram and Identification Scheme. Circuit Controlling Devic
Volume – II POWER DISTRIBUTION SYSTEM Bus Bar, split bus bar system, special purpose cables. Electrical diagram and identification scheme. Circuit controlling devices. Power utilization-typical application to avionics. Bus Bar - Introduction In most of aircrafts, the output from the generating sources is coupled to one or more low impedance conductors referred as bus bars. This are situated at central points within the aircraft and provides positive supplies to various consumer circuits. In a very simple system a bus bar can take the form of a strip of interlinked terminals while in complex system. Main bus bars are thick metal strips or rods to which input and output supply connections can be made. Bus Bar Systems Requirements: i) Power-consuming equipment must not be deprived of power in the event of power source failures. ii) Failure on the distribution system should have the minimum effect on system functioning. 1 Introduction to Avionics iii) Power consuming equipment faults must not endanger the supply of power to other equipment. Types of Consumer Services: i) Vital Services: These services are connected directly to the battery. For Example, during an emergency wheels up landing emergency lighting and crash switch operation of fire extinguishers are required. ii) Essential Services: Those are required to ensure safe flight in an in- flight emergency situation. They are connected to dc or ac bus bars. iii) Non-Essential Services: These are isolated in an in-flight emergency for load shedding purposes. Bus bar System: From the below diagram 1.1 the power supplies are 28 volts dc from engine driven generators, 115 volts 400 Hz ac from rotary inverters and 28 volts dc from batteries. -
Electric and Magnetic Fields the Facts
PRODUCED BY ENERGY NETWORKS ASSOCIATION - JANUARY 2012 electric and magnetic fields the facts Electricity plays a central role in the quality of life we now enjoy. In particular, many of the dramatic improvements in health and well-being that we benefit from today could not have happened without a reliable and affordable electricity supply. Electric and magnetic fields (EMFs) are present wherever electricity is used, in the home or from the equipment that makes up the UK electricity system. But could electricity be bad for our health? Do these fields cause cancer or any other disease? These are important and serious questions which have been investigated in depth during the past three decades. Over £300 million has been spent investigating this issue around the world. Research still continues to seek greater clarity; however, the balance of scientific evidence to date suggests that EMFs do not cause disease. This guide, produced by the UK electricity industry, summarises the background to the EMF issue, explains the research undertaken with regard to health and discusses the conclusion reached. Electric and Magnetic Fields Electric and magnetic fields (EMFs) are produced both naturally and as a result of human activity. The earth has both a magnetic field (produced by currents deep inside the molten core of the planet) and an electric field (produced by electrical activity in the atmosphere, such as thunderstorms). Wherever electricity is used there will also be electric and magnetic fields. Electric and magnetic fields This is inherent in the laws of physics - we can modify the fields to some are inherent in the laws of extent, but if we are going to use electricity, then EMFs are inevitable. -
Power Transformers and Reactors
GE Grid Solutions Power Transformers and Reactors Imagination at work Today’s Environment The Right Transformer Growth in the world's population and economy, will result in a for the Right Application substantial increase in energy demand over the coming years. GE offers utilities advanced solutions to improve grid stability and The International Energy Agency (IEA)1 estimates that $20 trillion increase efficiency of transmission infrastructure. will need to be invested in power and grid technologies, over the next 25 years, to keep up with demand. According to a 2015 IEA From low to ultra-high voltage; small to extra-large power report2, renewable energy will represent the largest single source ratings; standard to the most complex designs; GE has the of electricity growth over the next five years - rising to a 26 % right share of global generation. solution for every application. Integrating renewable energy sources into the grid can conflict Conventional Power Transformers with Utilities’ existing modernization and optimization plans. From 5 MVA up to 1500 MVA & 765 kV Utilities face increasing challenges of reliability, safety, power ' Small & medium power transformers quality and economics when planning substations and choosing ' Large power transformers switchgear. ' Generator step-up transformers Additionally, power systems are interconnected and highly ' Autotransformers complex networks which are susceptible to instabilities. Managing and maintaining today‘s complex grid pose many Oil-Immersed Reactors challenges, including: Up to 250 Mvar & 765 kV / 2640 Mvar ' Increasing grid efficiency and resilience without adequate ' Shunt reactors funding to invest in new capital equipment. ' Series reactors ' Expertise to manage the grid is rapidly diminishing due to the ' Earthing reactors lack of skilled, technical resources in the workplace. -
US, Qatar Commit to Advance High-Level Strategic Co-Operation
COMMUNITY | Page 16 QATAR | Page 7 South African cancer survivor says she owes it to Qatar New system to improve for saving life training standards in driving schools published in QATAR since 1978 WEDNESDAY Vol. XXXX No. 11240 July 10, 2019 Dhul Qa’dah 7, 1440 AH GULF TIMES www. gulf-times.com 2 Riyals US, Qatar commit to advance high-level strategic co-operation His Highness the Amir Sheikh Tamim bin Hamad al-Thani with US President Donald His Highness the Amir Sheikh Tamim bin Hamad al-Thani and US President Donald Trump attending the working lunch at the White House yesterday. Trump meeting at the White House yesterday. O Amir meets US President at the White House O Several agreements and MoUs signed in the fields of trade, investment and defence O Trump highlights role of Al Udeid Air Base QNA world, hailing Qatar’s large invest- the desire to multiply this fi gure for his planes and Gulfstream Aviation. Washington ments in the United States and the huge confi dence in the US economy. They also witnessed the signing of an agreements which will be signed later The Amir extended an invitation to agreement in the fi eld of air defence to in the day in the fi elds of trade, invest- the US president to visit Qatar and Al provide Qatar with multiple additional is Highness the Amir Sheikh ment and defence. Udeid Air Base. systems of air defence. Tamim bin Hamad al-Thani Trump highlighted the role of Al President Trump thanked the Amir The signing ceremony was attended Hand the President of the United Udeid Air Base and its strategic impor- for the invitation, and praised the by members of the offi cial delegation States of America Donald Trump dis- tance in the Middle East, terming it as achievements made by Qatar at Al accompanying the Amir. -
Power Transmission Engineering JUNE 2015 Gear up for Higher Reliability
® JUNE 2015 THE Path TO Smarter Bearings The True Cost of Bearing Lubrication A Deep Dive Into an Aerospace Gear Manufacturer Automotive Transmissions in Transition www.powertransmission.com Affordable Power Transmission high-quality components at low prices! Synchronous Drives AutomationDirect’s new line of synchronous drive components provide the same positive timing action of gears or chains but with the exibility and quiet running of belts. • Timing pulleys (sprockets) in both aluminum and steel are available in plain bore with setscrew or tapered bushing mounting styles. • Timing (toothed) belt options include several popular Drive Pulleys pitches and widths and are made of fi berglass starting at: reinforced neoprene. $5.25 • Tapered bushings in both QD®and Taper-lock® styles are available in most popular shaft sizes for mounting a variety of pulleys or sprockets to shafts. Get dependable power transmission at low, low prices with SureMotion® synchronous drives! Drive Belts starting at: $2.00 Precision Gearboxes The SureGear® PGCN series is an exceptional gearbox for servo, stepper, and Worm Gearboxes other motion control applications requiring a NEMA size input/output inter- IronHorse® worm gearboxes are manufactured face. Available in NEMA 17, NEMA 23 and NEMA 34 frames sizes with a wide in an ISO9001 certi ed plant by one of the range of ratios, a 20,000 hour service life, and a one year warranty. leading worm gear reducer manufacturers in the world today. They are available in both The SureGear® PGA and PGB series of high-precision servo gear reducers are aluminum and cast iron with a variety of frame excellent choices for applications that require accuracy and reliability at an sizes and ratios.