The H-frame tower is an older design and is typically a wooden structure. If a right-of-way is very narrow the one-footed design may be used, which is typically a concrete or metal pole. Standard four-footed towers are often preferred because they are more stable and resistant to winds and weather. There are a number of different types of towers that carry transmission lines. In general, the higher the voltage of the transmission line, the more power it can carry, which of course is the advantage of the higher voltage. And so these ultra-high voltage transmission systems carry DC power in some areas of the country. The project involved construction of 235 miles of double-circuit 345kV transmission line across the Texas Panhandle. Above 1,000 kV, some transmission lines convert to DC power since AC lines do not function as effectively at high voltages. new switching station from the Collingwood Hiple 345 kV line. The largest commonly found is about 750 kV. Iberdrola is proposing to connect to the American Electric Power (AEP) portion of the. While there are other transmission voltages, these are the most common. In these cases, anything between 39 kV and 50 kV is considered sub-transmission.Ĭommon industry voltages include 69, 115, 138, 230, and 345 kV. The electric industry defines transmission as any line with a voltage greater than 39 kV, or 39,000 volts, though you will find some companies defining transmission as anything over 50 kV. Transmission lines are the cables and supporting equipment that carry large amounts of power at high voltages from generating plants, typically located in remote areas, to the cities and towns where the power is consumed.
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