In this paper, two time-domain procedures are proposed for the calculation of lightning-induced voltages using lossy transmission line models available in electromagnetic transient simulators. both procedures, influence incident field is represented form current sources that connected externally at ends illuminated line. One formulated directly phase-domain and compatible with universal model (ULM). The second procedure modal domain by Marti. Both validated taking as reference a first order...

This article presents an investigation on the performance of a three-phase compact distribution line against nearby lightning strikes. It is shown that neglecting insulating layer surrounds phase conductors as usually done in this type study does not significantly change voltages induced from to ground, but can have some effect between and messenger, which are ones effectively stress insulation. However, observed differences strongly minimized if usual practice grounding messenger neutral...

Compact overhead distribution lines are composed of insulated phase conductors and bare grounded cables. The use an insulating layer allows a greater proximity between modifies the per-unit-length matrix propagation characteristics associated with line. However, it is not clear whether possible to accurately calculate its capacitance using simplified formulae available in literature. Also, unknown what extent line will be affected. This paper makes attempt clarify these aspects by rigorous...

In this paper, a study is performed to identify the influence of an insulating layer surrounding overhead cable on transient overvoltages induced by nearby lightning strikes. The considering or neglecting presence for different load conditions. It shown that including might be important accurately characterize tail resulting whenever mismatched loads are considered at line ends. On other hand, calculated peak voltages nearly unaffected layer.

In this paper, a compact matrix formulation that simplifies the calculation of lumped sources necessary to estimate lightning-induced effects using transmission line models available in electromagnetic transient programs is proposed. As opposed an existing solution strategy requires sequential convolution integrals involving horizontal component incident electric field along multiple segments line, proposed allows such convolutions be performed at once. This not only increases model...

In this paper, a new procedure is proposed for determining the external current sources required evaluating lightning-induced voltages on overhead lines with extended-modal domain (EMD) model. Unlike original model, in which calculation of inducing depends fitting characteristic admittance line, performed using impedance line. This significantly simplifies use EMD model because now all parameters can be readily obtained from built-in tool that usually available electromagnetic transient...

This paper is dedicated to investigate the impact of two multigrounded conductors on performance a three-phase compact distribution line against lightning-induced voltages. The natural presence messenger cable in close proximity with phase conductors, combined use periodically-grounded neutral required systems, shown reduce voltages induced across insulators compared case which absent. It also that phase-to-messenger increase reduction both grounding intervals and values resistance. Finally,...