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We clarified the influence of grounding resistance on the effectiveness of lightning protection for power distribution lines with a ground wire (GW) and surge arresters (SAs) by EMTP analysis and experiments. The results indicated that power distribution lines with both a GW and SAs can increase the lightning protection level against direct hits without lowering the grounding resistance compared with...
Shielded by high structure surrounding and with short length of power line, low voltage system is seldom suffered from direct strokes. However, this system is especially threatened by induced voltage due to nearby strokes. The effects of induced overvoltage may be very harmful to power quality and to low BIL peculiar to electrical equipment in low voltage system. In this work, the induced overvoltage...
As the proximity of high fault current power lines to residential areas increases, the need for accurate prediction of earth potential rise (EPR) is of crucial importance for both safety and equipment protection. To date, the most accurate methods for predicting EPR are power system modelling software tools, such as EMTP, or recursive methods that use a span by span approach to model a transmission...
One of the major tasks of a grounding system is to ensure safety for sensitive electrical and electronic equipments. The purpose of this paper is to provide knowledge of the physics of the lightning and of its effects on a GSM communication tower (low voltage circuit). Lightning interaction with man-made communication networks is part of the general area of electromagnetic compatibility (EMC). Based...
This paper describes lightning surge propagation characteristics on a nonuniform line are dependent on location. The propagation characteristics of the nonuniform line are different from those of the uniform one due to multiple reflections on the nonuniform line. It is impossible to derive an analytical formula to represent the surge characteristics of the nonuniform line in time domain without assumption...
The Distribution System Analysis Subcommittee (DSASC) has defined a simple test case for neutral-to-earth voltage calculations. This paper presents a solution in the Alternative Transients Program (ATP), with illustrations of both ldquostray voltagerdquo and ldquotemporary overvoltagerdquo. With scripting, stream-oriented editing, and text processing, the ATP may be used to perform sensitivity studies...
This paper is the second in the series dealing with probabilistic station strain bus uprating. The paper describes the formulation, computational procedure, and analytical techniques for evaluating insulator assembly failures due to conductor bundle collapse and conductor swingout. In addition, the problem of conductor clearance has been formulated to determine the probability of interphase flashover...
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