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Variable-frequency Transformer
A variable-frequency transformer (VFT) is used to transmit electricity between two ( asynchronous or synchronous) alternating current frequency domains. The VFT is a relatively recent development. Most asynchronous grid inter-ties use high-voltage direct current converters, while synchronous grid inter-ties are connected by lines and "ordinary" transformers, but without the ability to control power flow between the systems, or with phase-shifting transformers with some flow control. It can be thought of as a very high power synchro, or a rotary converter acting as a frequency changer, which is more efficient than a motor–generator of the same rating. Construction and operation A variable-frequency transformer is a doubly fed electric machine resembling a vertical shaft hydroelectric generator with a three-phase wound rotor, connected by slip rings to one external power circuit. The stator is connected to the other. With no applied torque, the shaft rotates due to the differen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Power
Electric power is the rate of transfer of electrical energy within a electric circuit, circuit. Its SI unit is the watt, the general unit of power (physics), power, defined as one joule per second. Standard prefixes apply to watts as with other SI units: thousands, millions and billions of watts are called kilowatts, megawatts and gigawatts respectively. In common parlance, electric power is the production and delivery of electrical energy, an essential public utility in much of the world. Electric power is usually produced by electric generators, but can also be supplied by sources such as Electric battery, electric batteries. It is usually supplied to businesses and homes (as domestic mains electricity) by the electric power industry through an electrical grid. Electric power can be delivered over long distances by electric power transmission, transmission lines and used for applications such as Electric motor, motion, Electric light, light or Electric heat, heat with high ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Direct-current
Direct current (DC) is one-directional flow of electric charge. An electrochemical cell is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through semiconductors, insulators, or even through a vacuum as in electron or ion beams. The electric current flows in a constant direction, distinguishing it from alternating current (AC). A term formerly used for this type of current was galvanic current. The abbreviations ''AC'' and ''DC'' are often used to mean simply ''alternating'' and ''direct'', as when they modify '' current'' or ''voltage''. Direct current may be converted from an alternating current supply by use of a rectifier, which contains electronic elements (usually) or electromechanical elements (historically) that allow current to flow only in one direction. Direct current may be converted into alternating current via an inverter. Direct current has many uses, from the charging of batteries to large power ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comisión Federal De Electricidad
The Comisión Federal de Electricidad () is the Government-owned company, state-owned electric utility of Mexico, widely known as CFE. The Mexican Constitution of Mexico, constitution states that the government is responsible for the control and development of the national electric industry, and CFE carries out this mission. The company's slogan is "Una empresa de clase mundial" ("A World-Class Company"). Affiliations CFE is not a part of the North American Electric Reliability Corporation, though its transmission system in northern Baja California is part of the Western Electricity Coordinating Council through its interconnection with San Diego Gas & Electric via the Miguel-Tijuana and the LaRosita-Imperial Valley Lines and the Path 45 corridor; it also has a few other interconnections across the border with local utilities in the United States. On August 2, 2019, the federal government announced it will provide Internet access throughout the country through the establishment of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ERCOT
The Electric Reliability Council of Texas, Inc. (ERCOT) is an American organization that operates Texas's electrical grid, the Texas Interconnection, which supplies power to more than 25 million Texas customers and represents 90 percent of the state's electric load. ERCOT is the first independent system operator (ISO) in the United States. ERCOT works with the Texas Reliability Entity (TRE), one of six regional entities within the North American Electric Reliability Corporation (NERC) that coordinate to improve reliability of the bulk power grid. As the ISO for the region, ERCOT dispatches power on an electric grid that connects more than 46,500 miles of transmission lines and more than 610 generation units. ERCOT also performs financial settlements for the competitive wholesale bulk-power market and administers retail switching for 7 million premises in competitive choice areas. According to an ERCOT report, the major sources of generating capacity in Texas in 2020 were natur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 contiguous states border Canada to the north and Mexico to the south, with the semi-exclave of Alaska in the northwest and the archipelago of Hawaii in the Pacific Ocean. The United States asserts sovereignty over five Territories of the United States, major island territories and United States Minor Outlying Islands, various uninhabited islands in Oceania and the Caribbean. It is a megadiverse country, with the world's List of countries and dependencies by area, third-largest land area and List of countries and dependencies by population, third-largest population, exceeding 340 million. Its three Metropolitan statistical areas by population, largest metropolitan areas are New York metropolitan area, New York, Greater Los Angeles, Los Angel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laredo, Texas
Laredo ( ; ) is a city in the U.S. state of Texas and the county seat of Webb County, Texas, Webb County, on the north bank of the Rio Grande in South Texas, across from Nuevo Laredo, Tamaulipas, Mexico. Founded in 1755, Laredo grew from a village to the capital of the short-lived Republic of the Rio Grande to the largest inland port on the Mexico–United States border, Mexican border. Laredo's economy is primarily based on international trade with Mexico, and as a major hub for three areas of transportation: land, rail, and air cargo. The city is on the southern end of Interstate 35, I-35, which connects manufacturers in northern Mexico through Interstate 35 as a major route for trade throughout the U.S. It has International bridges in Laredo, Texas, four international bridges and two railway bridges. According to the 2020 United States Census, 2020 census, the city's population was 255,205, making it the List of cities in Texas by population, 11th-most populous city in Texas an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beauharnois, Quebec
Beauharnois (; ) is a city located in the Beauharnois-Salaberry Regional County Municipality of southwestern Quebec, Canada, and is part of the Greater Montreal Area. The city's population as of the Canada 2021 Census was 13,638. It is home to the Beauharnois Hydroelectric Power Station, as well as the Beauharnois Lock of the Saint Lawrence Seaway. History During the Lower Canada Rebellion, the Battle of Beauharnois was fought in 1838, between Lower Canada loyalists and Patriote rebels. After Edward Ellice and his family were taken prisoner by rebels, the townspeople rebelled. The British were able to quash the rebellion and captured over a hundred Patriote rebels. The Beauharnois Canal was dug between 1842 and 1845 to connect the lakes Saint-Louis and Saint-Francois as part of a larger project that included the expansion of the Lachine canal. During these years, however, a series of labor conflicts emerged during the canal's construction. On June 3, 1843, a strike be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Les Cèdres, Quebec
Les Cèdres () is a municipality located north of the Saint Lawrence River in the Montérégie of Quebec, Canada, near Vaudreuil-Dorion. The population as of the Canada 2021 Census was 7,184. The name means "The Cedars" in French. There is an extensive rapid on the St. Lawrence River at this location. During the American Revolution, the Battle of the Cedars was fought in the vicinity. In 1959-1960 Swedish writer, Stig Claesson, lived in the village at a place called Point Charlie and later wrote a book about it called ''My friend Charlie''. History This location was already notable in the late 17th century because of the large rapids on the St. Lawrence River, marked by tall cedars (French: ''les cèdres'') that grew there in abundance. Hence, the location was originally known as Cedars Rapids, or as mentioned by cartographer Deshayes in 1695, as ''Rapide du des Cèdres''. Subsequently, it was also known as Coteau-des-Cèdres, Portage-du-Coteau-des-Cèdres, or just Les Cè ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydro-Québec
Hydro-Québec () is a Canadian Crown corporations of Canada#Quebec, Crown corporation public utility headquartered in Montreal, Quebec. It manages the electricity generation, generation, electric power transmission, transmission and electricity distribution, distribution of electricity in Quebec, as well as the export of power to portions of the Northeast United States. More than 40 percent of Canada’s water resources are in Quebec and Hydro-Québec is among the largest hydropower producer in the world. It was established as a Crown corporation by the government of Quebec in 1944 from the expropriation of private firms. This was followed by massive investment in hydro-electric projects like the James Bay Project. Today, with 63 hydroelectricity, hydroelectric power stations, the combined output capacity is 37,370 megawatts. Extra power is exported from the province and Hydro-Québec supplies 10 per cent of New England's power requirements. The company logo, a stylized "Q" fash ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northeastern United States
The Northeastern United States (also referred to as the Northeast, the East Coast, or the American Northeast) is List of regions of the United States, census regions United States Census Bureau. Located on the East Coast of the United States, Atlantic coast of North America, the region borders Canada to its north, the Southern United States to its south, the Midwestern United States to its west, and the Atlantic Ocean to its east. The Northeast is one of the four regions defined by the U.S. Census Bureau for the collection and analysis of statistics. The Census Bureau defines the region as including the six New England states of Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont, and three lower North-Eastern states of New Jersey, New York (state), New York, and Pennsylvania. Some expanded definitions of the region include Mid-Atlantic (United States), Mid-Atlantic locations such as Delaware, Maryland, Northern Virginia, and Washington, D.C. The regio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canada
Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of countries and dependencies by area, second-largest country by total area, with the List of countries by length of coastline, world's longest coastline. Its Canada–United States border, border with the United States is the world's longest international land border. The country is characterized by a wide range of both Temperature in Canada, meteorologic and Geography of Canada, geological regions. With Population of Canada, a population of over 41million people, it has widely varying population densities, with the majority residing in List of the largest population centres in Canada, urban areas and large areas of the country being sparsely populated. Canada's capital is Ottawa and List of census metropolitan areas and agglomerations in Canada, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Québec
Quebec is Canada's largest province by area. Located in Central Canada, the province shares borders with the provinces of Ontario to the west, Newfoundland and Labrador to the northeast, New Brunswick to the southeast and a coastal border with the territory of Nunavut. In the south, it shares a border with the United States. Between 1534 and 1763, what is now Quebec was the French colony of ''Canada'' and was the most developed colony in New France. Following the Seven Years' War, ''Canada'' became a British colony, first as the Province of Quebec (1763–1791), then Lower Canada (1791–1841), and lastly part of the Province of Canada (1841–1867) as a result of the Lower Canada Rebellion. It was confederated with Ontario, Nova Scotia, and New Brunswick in 1867. Until the early 1960s, the Catholic Church played a large role in the social and cultural institutions in Quebec. However, the Quiet Revolution of the 1960s to 1980s increased the role of the Government of Q ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
