Optimização de Terras em Subestações

12/15/2011

The optimization of the design of substation grounding grids is an issue that has assumed an increasing importance, since it seeks to reduce the amount of conductive material buried at the same time it must ensure an effective and safe flow of the ground fault current through the soil. In this work it has been developed a program that, starting from a standard grounding grid project, apply an optimization method that has the potential to reduce the conductive material used, while keeping the security at the substation. The method combines two techniques: variable spacing technique developed by Sverak, which is well established and has proven results, and placement of grounding rods, a technique that has been little explored in the literature but will be studied in detail in this work and its effectiveness will be proven. The optimization is supported by an analysis methodology, based on the work done by Dawalibi and Mukhedkar, and has the potentiality to infer about the grounding grid safety, by calculating the step and touch voltages. The analysis method, also developed in this work, takes into account the non-uniform current distribution, the soil stratification (2 layers) and the consideration of grounding rods (although limited to the soil?s first layer). All these possibilities will be explored through several studies, from which will be extracted very relevant information to the theme in which this work fits.

Authors in the community:

• 

  N

  Nuno Jorge Lopes Filipe

  ist158002

Supervisors of this institution:

• 

  M

  Maria Eduarda De Sampaio Pinto de Almeida Pedro

  ist12527

• 

  M

  Maria Teresa Nunes Padilha de Castro Correia de Barros

  ist11073

electrical-engineering-electronic-engineering-information-engineering - Electrical engineering, electronic engineering, information engineering

eng - English

Instituto Superior Técnico