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Fig. 20. Output of the B-TERRA software related to the best grounding design for the
selected device.
6. Conclusion
In this chapter, it has been presented the theoretical development employed to estimate
induced voltages in overhead distribution lines supposing a generic discharge current
waveform, as well as assuming a finite distribution line.
Taking into account the results provided by the developed technique, an expert system to
help in the equipments and distribution transformers protection specification was
implemented in order to provide indicatives about the best protection to be adopted to
transformers, as well as the best installation distance between arresters, aiming the full
protection of the distribution line where these equipments are inserted.
Performance evaluations indicate that the expert system provides coherent results and its
practical application contributes to optimize the processes involved with parameters
specification related to the equipments and transformers protection.
Additionally, an expert system to assist in the specification of parameters for grounding
designs was also implemented. Regarding the grounding system optimized with this tool,
we can state that energy to be dissipated on the distribution system is lower than that
observed in a non-optimized system, as shown in the charts in Section 5.
The difference in energy between the two cases implies in the energy that flows through the
grounding system, i.e., for being better designed the optimized grounding system allows
more energy to flow by itself compared to that case of non-optimized system. Experimental
evaluations indicate that they provide very consistent results and their practical applications
help for optimizing the processes involved with the protection of distribution systems.
7. References
Borghetti, A.; Nucci, C. A. & Paolone, M. (2007). An improved procedure for the assessment
of overhead line indirect lightning performance and its comparison with the IEEE
Std. 1410 method.
IEEE Transactions on Power Delivery
, Vol. 22, No.1, pp. 684-692.
Cooray, G. V. (2003).
The Lightning Flash
. IEE Power & Energy Series, London, UK.
