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Moscow–Kashira HVDC Transmission System
The Moscow–Kashira HVDC transmission system was an early high-voltage direct current (HVDC) connection between the town of Kashira and the city of Moscow in Russia, where the terminal was at . The system was built using mercury-arc valves and other equipment removed from the Elbe Project in Berlin at the end of World War II. Although primarily experimental in nature, the system was the first true static, electronic, high-voltage DC scheme to enter service. Earlier DC transmission schemes had either used electromechanical converters based on the Thury system, such as the Lyon–Moutiers DC transmission scheme or had been at only medium voltage, such as the 12 kV frequency converter scheme at Mechanicville, New York in the United States. The scheme had a nominal power rating of 30 MW and was operated at different times as a bipole at ±100 kV or a monopole, with earth return, at 200 kV. For most of the transmission distance of 125 km, the transmissi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-voltage Direct Current
A high-voltage direct current (HVDC) electric power transmission system uses direct current (DC) for electric power transmission, in contrast with the more common alternating current (AC) transmission systems. Most HVDC links use voltages between 100 kV and 800 kV. HVDC lines are commonly used for long-distance power transmission, since they require fewer conductors and incur less power loss than equivalent AC lines. HVDC also allows power transmission between AC transmission systems that are not synchronized. Since the power flow through an HVDC link can be controlled independently of the phase angle between source and load, it can stabilize a network against disturbances due to rapid changes in power. HVDC also allows the transfer of power between grid systems running at different frequencies, such as 50 and 60 Hz. This improves the stability and economy of each grid, by allowing the exchange of power between previously incompatible networks. The modern form o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Overhead Line
An overhead line or overhead wire is an electrical cable that is used to transmit electrical energy to electric locomotives, Electric multiple unit, electric multiple units, trolleybuses or trams. The generic term used by the International Union of Railways for the technology is ''overhead line''. It is known variously as overhead catenary, overhead contact line (OCL), overhead contact system (OCS), overhead equipment (OHE), overhead line equipment (OLE or OHLE), overhead lines (OHL), overhead wiring (OHW), traction wire, and trolley wire. An overhead line consists of one or more wires (or Overhead conductor rail, rails, particularly in tunnels) situated over rail tracks, raised to a high electrical potential by connection to feeder stations at regularly spaced intervals along the track. The feeder stations are usually fed from a High voltage, high-voltage Electricity distribution, electrical grid. Overview Electric trains that collect their current from overhead lines use a de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Power Infrastructure In Russia
Electricity is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwell's equations. Common phenomena are related to electricity, including lightning, static electricity, electric heating, electric discharges and many others. The presence of either a positive or negative electric charge produces an electric field. The motion of electric charges is an electric current and produces a magnetic field. In most applications, Coulomb's law determines the force acting on an electric charge. Electric potential is the Work (physics), work done to move an electric charge from one point to another within an electric field, typically measured in volts. Electricity plays a central role in many modern technologies, serving in electric power where electric current is used to energise equipment, and in electronics dealing w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Power Transmission
Electric power transmission is the bulk movement of electrical energy from a generating site, such as a power plant, to an electrical substation. The interconnected lines that facilitate this movement form a ''transmission network''. This is distinct from the local wiring between high-voltage substations and customers, which is typically referred to as electric power distribution. The combined transmission and distribution network is part of electricity delivery, known as the electrical grid. Efficient long-distance transmission of electric power requires high voltages. This reduces the losses produced by strong currents. Transmission lines use either alternating current (AC) or direct current (DC). The voltage level is changed with transformers. The voltage is stepped up for transmission, then reduced for local distribution. A wide area synchronous grid, known as an ''interconnection'' in North America, directly connects generators delivering AC power with the same rela ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of HVDC Projects
Electric power transmission through interconnectors using high-voltage direct-current (HVDC) involves usually two converter stations and a transmission line. Generally overhead lines are used, but an important class of HVDC projects use submarine power cables. A back-to-back station has no transmission line and joins two separate AC grids at a single point. Historical HVDC systems used the Thury system of motor-generators but these have all been made obsolete by later developments such as mercury-arc valves (now also obsolete), thyristors, and IGBT power transistors. Legend Converter technology: * Thury = Series-connected generators as designed by René Thury * Merc = Mercury-arc valve rectifier and inverter * Thyr = Thyristor rectifier and inverter * IGBT = Insulated gate bipolar transistor * BIGT = Bi-mode insulated gate transistor * IEGT = Injection enhanced gate transistor Line status: Africa Australia and Oceania Asia Europe 2 As of 9 December 2015, L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soviet Union
The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet Union, it dissolved in 1991. During its existence, it was the list of countries and dependencies by area, largest country by area, extending across Time in Russia, eleven time zones and sharing Geography of the Soviet Union#Borders and neighbors, borders with twelve countries, and the List of countries and dependencies by population, third-most populous country. An overall successor to the Russian Empire, it was nominally organized as a federal union of Republics of the Soviet Union, national republics, the largest and most populous of which was the Russian SFSR. In practice, Government of the Soviet Union, its government and Economy of the Soviet Union, economy were Soviet-type economic planning, highly centralized. As a one-party state go ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HVDC Volgograd–Donbass
The HVDC Volgograd–Donbass is a long bipolar ±400 kV high voltage direct current powerline used for transmitting electric power from Volga Hydroelectric Station at Volgograd in Russia to Donbas in eastern Ukraine and ''vice versa''. The Volgograd–Donbass system was the second HVDC scheme built in the former Soviet Union, following the Moscow–Kashira HVDC scheme which had already been shut down. The Volgograd–Donbass system can transfer a maximum power of 750 MW. When completed in 1965, its operating voltage of ±400 kV was the highest in the world, and remained so until the completion of the ±450 kV Nelson River scheme in 1977. The scheme is today in a bad state and only operated with a voltage of 100 kV. Nevertheless, it is still being modernized, as a Google Map Picture of its crossing with M-4 motorway at shows, where one can see that new pylons for the crossing of the motorway are under construction. There are concerns over poten ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uno Lamm
August Uno Lamm (May 22, 1904 – June 1, 1989) was a Swedish electrical engineer and inventor. He was sometimes called "The Father of High Voltage Direct Current" power transmission. During his career, Lamm obtained 150 patents. In 1980 the Institute of Electrical and Electronics Engineers (IEEE) developed the Uno Lamm High Voltage Direct Current Award for contributions to the field of high voltage electrical engineering. Biography Lamm was born in Gothenburg, Sweden to Fredrik Hjalmar Lamm and Aino Maria Lovisa Wilhelmina Wijkander. He obtained his master's degree at KTH Royal Institute of Technology in Stockholm in 1927. After a short time in compulsory military service he joined ASEA, the Swedish electrical conglomerate, initially working in their training program. In 1929 he was made manager of the project to develop a high-voltage mercury arc valve. Valves at the time operated only up to about 2500 volts, and if higher-voltage valves were available they could hav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anode
An anode usually is an electrode of a polarized electrical device through which conventional current enters the device. This contrasts with a cathode, which is usually an electrode of the device through which conventional current leaves the device. A common mnemonic is ACID, for "anode current into device". The direction of conventional current (the flow of positive charges) in a circuit is opposite to the direction of electron flow, so (negatively charged) electrons flow from the anode of a galvanic cell, into an outside or external circuit connected to the cell. For example, the end of a household battery marked with a "+" is the cathode (while discharging). In both a galvanic cell and an electrolytic cell, the anode is the electrode at which the oxidation reaction occurs. In a galvanic cell the anode is the wire or plate having excess negative charge as a result of the oxidation reaction. In an electrolytic cell, the anode is the wire or plate upon which excess positive charge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-voltage Cable
A high-voltage cable (HV cable), sometimes called a high-tension cable (HT cable), is a cable used for electric power transmission at high voltage. A cable includes a conductor and insulation. Cables are considered to be fully insulated. This means that they have a fully rated insulation system that will consist of insulation, semi-con layers, and a metallic shield. This is in contrast to an overhead line, which may include insulation but not fully rated for operating voltage (EG: tree wire). High-voltage cables of differing types have a variety of applications in instruments, ignition systems, and alternating current (AC) and direct current (DC) power transmission. In all applications, the insulation of the cable must not deteriorate due to the high-voltage stress, ozone produced by electric discharges in air, or tracking. The cable system must prevent contact of the high-voltage conductor with other objects or persons, and must contain and control leakage current. Cable joints an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kashira
Kashira () is a types of inhabited localities in Russia, town and the administrative center of Kashirsky District, Moscow Oblast, Kashirsky District in Moscow Oblast, located on the Oka River south of Moscow. Population: History It was first mentioned in 1356 as the village of Koshira () named after the Koshira River (today's Kashirka River). However, 1619 is considered Kashira's foundation year, when the town was transferred from the left bank of the Oka to the right bank some upstream and rebuilt after it was badly damaged by the Crimean Tatars in 1592 and 1596. The town was once home to exiled Khanate of Kazan, Kazan Khan Ghabdellatif of Kazan, Ghabdellatif. The coat of arms of Kashira contains the image of Zilant, a heraldic symbol of Kazan. Town status was granted to Kashira in 1777. Kashira's southern suburbs were entered in by Germany on 24 November to 17 December 1941 and was a massacre site of Poles and Jews relating to the Katyn massacre. It is reported that, dur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mechanicville, New York
Mechanicville is a city in Saratoga County, New York, United States. The population was 5,163 at the 2020 census, a small decrease from 5,196 in 2010. It is the smallest city by area in the state. The name is derived from the occupations of early residents. The city is located on the eastern border of Saratoga County and is north of Albany, the state capital. Mechanicville borders the towns of Stillwater (of which it was once a part) and Halfmoon in the county, and the town of Schaghticoke, Rensselaer County. History The first listing of a settlement on Tenandeho Creek (Anthony Kill) is in 1721. At that time, Cornelius Van Buren had a sawmill at the mouth of the creek where it emptied into the Hudson River. The first documented occurrence of the name "Mechanicville" dates back to 1829. The name comes from the early settlers, who were independent mastercraftsmen such as millers, carpenters, or butchers, whose professions were commonly known as the " mechanical arts" at the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
