Technical FAQs 4

What voltage does a transmission line use?

Transmission line voltages range from 230 thousand volts (kV) to 765 kV, though lower voltages can be used as well. The higher the voltage, the more power can move through the line. Approximately 98% of the U.S. transmission system uses alternating current (AC) power, in which the direction of electrical charge changes 60 times per second.

What voltage does a subtransmission line carry?

Subtransmission Lines carry voltages that are typically between 26kV and 69kV to regional distribution substations, that is, to substations that distribute power across a geographic region. Two subtransmission line towers are shown in Figure 4. Note that subtransmission lines may be tapped to provide power for local industries and substations.

How many volts is a substation?

Substations: The electricity in homes is typically 120 volts (1 kV = 1,000 volts). When electricity moves from transmission lines to subtransmission lines to distribution lines, the voltage must be “stepped down” by transformers. This occurs at substations, like the one in the photo on the left.

How many kV does a transmission line transmit?

Summary i) Overhead transmission lines transmit 3Φ AC power over long distances (300 miles or less) and at high voltages. Common voltage levels range from 115 kV to 765 kV. ii) Underground transmission lines are buried in trenches, in conduits, or in vaults, and often cooled.

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