This paper is concerned with direct or indirect lightning strokes on wind turbines, studying overvoltages and electromagnetic transients. As wind power generation undergoes rapid growth, lightning damages involving wind turbines have come to be regarded with more attention. With the aim of providing further insights into the lightning protection of wind turbines, describing the transient behavi...

This paper is concerned with lightning surge propagation on wind turbines. As wind power generation undergoes rapid growth, lightning incidents involving wind turbines have come to be regarded as a serious problem. Nevertheless, no known studies exist yet in Portugal regarding lightning protection of wind turbines. Hence, we present a case study, based on a wind turbine with an interconnecting ...

This paper proposes the solutions to prevent over-voltage for the 220 kV distribution substations with several different voltage levels. The motivation comes from the failures of surge arrester number 2 of phase B at the transformer number 2 (CS2BAT2) of the Vietnamese 220 kV Thainguyen substation due to the over-voltage. The main objective is to enhance the operating stability of a scattered c...

Methodology for parameterization of voltage transformer model was developed. Verification the is carried out by comparing nameplate data with results computer calculations. The magnetization branch parameters are determined values, such as current and residual transformer’s magnetic circuit. In conclusion error angular estimated in terms amplitude values root-mean-square curve type «NOL-SECH-20...

In this article, the effects of variable height in overhead power lines are investigated with reference to surges produced by direct and indirect lightning events. Simulations carried out both an implicit finite-difference time-domain scheme commercial tool EMTP-RV. Differences waveforms computed two approaches discussed clarified. Additionally, validity commonly adopted assumption weakly varyi...

Double circuit flashovers may cause very severe system disturbances when taking place on some critical double-circuit lines of an electrical network. Line arresters offer efficient solution to protect these specific against double outages due lightning. This paper will study, a 400-kV line, the protection provided by line The efficiency several configurations be compared. For that purpose, ligh...

This paper contributes towards the establishment of a formal analysis method of control system equations solved through fixed-point iterations. The success of fixed-point iterations relies on contraction properties of the function to be iterated. A convergence criterion is presented and accuracy is not sacrificed over gain in computational time. The presented algorithms are illustrated in EMTP-...