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SUMMARYThis paper investigates the surge propagation characteristics of an 1100-kV transmission line based on field test results and EMTP simulations. The EMTP simulations shows that the arc horn voltage is almost the same as the phase-wire voltage to earth, and thus the measured arc horn voltage can be regarded as the phase-to-earth voltage. The surge-wave deformation after a distance greater than 2 km measured in the field test is analytically explained as due to separation of modal traveling waves, the earth-return and the aerial modes, because the travel times of the two modes become noticeably different. A distinctive feature of the 1100-kV line is its very small attenuation, about half that on a 500-kV transmission line.

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