J. H. Hagenguth

Bio: J. H. Hagenguth is an academic researcher. The author has contributed to research in topics: Lightning. The author has an hindex of 1, co-authored 1 publications receiving 15 citations.

A Scale Model for the Study of the LEMP Response of Complex Power Distribution Networks

Abstract: This paper deals with scale models of power distribution systems for the study of lightning induced voltages on overhead lines. The scale model technique is useful for the investigation of situations which are prohibitively complex to be treated theoretically. For instance, urban distribution networks are usually characterized not only by complex topologies but also by the presence of nearby buildings, whose influence on the lightning induced effects can be successfully evaluated by means of reduced models. The paper first describes the scale model implemented for such a purpose at the University of Sao Paulo, Sao Paulo, Brazil. It then presents a comparison between the experimental data obtained with the scale model and the computer simulations obtained by using the LIOV-EMTP code, a software tool able of calculating lightning-induced electromagnetic transients in distribution systems having complex configurations. Finally, the paper shows an application of the scale model in the evaluation of lightning induced voltages on distribution networks considering the presence of nearby buildings

Determination of Lightning Response of Transmission Lines by Means or Geometrical Models

Abstract: The voltages produced across the tower insulators of transmission lines struck by lightning can be determined both by measurements on geometrical models and by calculations. Measurements which have been made on geometrical models of the Ohio Valley Electric Corporation's (OVEC) 345-kv transmission towers agree well with the calculations of Lundholm, Finn, and Price.1 A simplified theory has been developed, using electromagnetic field concepts and the distributed constants of transmission lines, which explains the relationships between insulator voltages and lightning voltages and lightning stroke currents. This theory includes the effects of the magnetic field produced by the return stroke and the changing electric fields produced by neutralization of the charged column of the leader.

The Lightning Stroke

Abstract: IN RECENT YEARS renewed interest has developed in the effect of lightning on electrical transmission lines. The most vital characteristic of lightning in most methods of calculating its effect is the current measured at the ground terminal. A large amount of data is available about the stroke current crest magnitude and a considerable amount of data is available which covers the time-to-crest of the stroke current. Despite these data there is still controversy over the time-to-crest. Measurements in the region of a microsecond are admittedly difficult. The industry is still seeking new data. In approaching this problem, it was felt that it might be conducive of results to analyze the mechanism of the return stroke and then, from the factors governing the mechanism, try to synthesize the stroke. Perhaps certain limits to the rate of rise could be ascertained. Some of the characteristics of the component factors could be obtained in the laboratory, others by computation. It was with this in mind that the present investigation was undertaken.

A Sensitivity Analysis of Lightning Performance Calculations for Transmission Lines

Abstract: Analyses have been made of the sensitivity of lightning outage rate predictions to uncertainties and variations in the various parameters incorporated in the normal prediction methods. The influence of upward streamers on the insulator voltages produced by charge in the stroke channel has been studied, and it is shown that the magnitudes of these voltages are very dependent on the assumed length of the streamers.