Transmission and distribution engineering deals with the operation of such power transmission facilities, and although there has not been much change in its basic principles or roles, as the system has expanded quantitatively, the introduction of new technologies and the installation and operation of advanced equipment have advanced, bringing about many qualitative changes. Therefore, it is natural that transmission and distribution engineering itself should be newly refined and greatly reinforced in its content.

The author first entered the field of electric power in 1967 as a manager of the KEPCO System Planning Department, and then moved to a university in 1974, where he consistently taught electric power engineering. In particular, he was most attached to transmission and distribution engineering as a core subject and has worked hard to enrich it.
"Transmission and Distribution Engineering," which has been revised and supplemented several times over the past 40 years, has been significantly revised and republished as the latest edition.
This revision, of course, included theoretical supplements, but more importantly, it included more practical and operational content centered on the current state of our country's systems.