Transient Behavior of Transmission Lines (TL)

Abstract

Transient phenomena in transmission lines (TL) occur, as in networks with bulk parameters, when any change takes place in their parameters, driving sources and/or configuration. In general, the transients are caused by lightning, switching or faults in TL. Studies of transient disturbances on a transmission system have shown that changes are followed by travelling waves, which at first approximation can be treated as step-front waves. For example, when a lightning strike influences a line conductor, the induced voltage wave tends to divide, each half going in opposite directions. When a voltage wave reaches a power transformer, for example, it causes a stress distribution which is not uniform and may lead to the breakdown of the insulation system.