Transmission

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KEPCO operates transmission networks efficiently and reliably with technical expertise.

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KEPCO¡¯s nationwide multi-loop transmission grid transports electric power with high reliability. Monitoring and controlling systems ensure the safety of underground transmission lines in urban areas and KEPCO applies its extensive experience and technology for maximum operational efficiency. Aging and outdated facilities are constantly replaced or upgraded at appropriate time. In particular, KEPCO accelerates the construction of 765kV large-capacity transmission systems to transport much more electricity with less power loss.

KEPCO has a leading edge in transmission with 21st-century networks, facilities, and automated systems.

Transmission voltages in Korea are 765kV and 345kV for trunk routes, and 154kV or 66kV for local networks. The 66kV lines are being replaced. KEPCO is now carrying out the second stage of the 765kV power transmission project that will serve as the backbone of the transmission in the 21st century. The power network of Jeju Island is now connected to the mainland transmission system by submarine high-voltage direct current (HVDC) cables. The Supervisory Control and Data Acquisition (SCADA) systems have been used to remotely monitor and control substation operations. In addition to equipment and facility upgrading, more substations are being automated and built indoors to secure power supply reliability.

(At 2011 year-end)

Transmission Facilities
Branches Line length (C-km) Supports (units)
Overhead Underground Total Steel towers Other Total
765kV 835 0 835 902 0 902
345kV 8,387 266 8,653 11,231 15 11,246
154kV 18,614 2,666 21,280 26,965 435 27,400
66kV 249 1 250 604 382 986
HVDC 180kV 29 202 231 0 617 617
Total 28,114 3,135 31,249 39,702 1,449 41,151

HVDC : High Voltage Direct Current

(At 2011 year-end)

Substation Capacity
Facilities Substations(number) Transformers
Manned Unmanned Total (banks) (MVA)
765kV 6 0 6 15 29,115.6
345kV 68 23 91 224 111,596.8
154kV 63 581 644 2,078 123,226.4
66kV 0 3 3 20 356.0
22.9kV 0 5 5 6 78.2
Total 137 612 749 2,343 264,373.0

The number of Substations includes Power Plant Switch Yards (48ea).