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In 1901, piping and heating contractor W. Frank Dowd established the Charlotte Pipe and Foundry Company in Charlotte, North Carolina, United States. [1] The foundry operated with 25 employees and cast iron soil pipes and fittings. [2] The company focused its efforts on iron casting for much of its early history. [1]
The Municipal Castings Association is an organization made up of the following American manufacturers: Charlotte Pipe and Foundry Company, D&L Foundry and Supply, US Foundry, EBAA Iron, EJ, McWane, Neenah Foundry, and Spring City. [3] Municipal castings also have to follow the country-of-origin marking requirement laws.
Graphs by hour of California's total electric load, the total load less solar and wind power (known as the duck curve) and solar power output. Data is for October 22, 2016, a day when the wind power output was low and steady throughout the day. In electrical engineering, a load profile is a graph of the variation in the electrical load versus ...
A typical one-line diagram with annotated power flows. Red boxes represent circuit breakers, grey lines represent three-phase bus and interconnecting conductors, the orange circle represents an electric generator, the green spiral is an inductor, and the three overlapping blue circles represent a double-wound transformer with a tertiary winding.
Power-voltage curve (also P-V curve) describes the relationship between the active power delivered to the electrical load and the voltage at the load terminals in an electric power system under a constant power factor. [1] When plotted with power as a horizontal axis, the curve resembles a human nose, thus it is sometimes called a nose curve. [2]
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Electrical length is widely used with a graphical aid called the Smith chart to solve transmission line calculations. A Smith chart has a scale around the circumference of the circular chart graduated in wavelengths and degrees, which represents the electrical length of the transmission line from the point of measurement to the source or load.
Dynamic (electrical overhead-)line rating is a great opportunity for transmission line operators (any voltage from 15 kV to 735 kV and over). It has been studied for more than 20 years inside CIGRE and IEEE working groups.