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| Author(s): |
Elson Costa Gomes
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Elétrica e de Computação |
| Defense date: | 2017-10-10 |
| Examining board members: |
Maria Cristina Dias Tavares;
Washington Luiz Araujo Neves;
José Carlos de Oliveira;
Patricia Mestas;
Carlos Alberto de Castro Junior
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| Advisor: | Maria Cristina Dias Tavares |
| Abstract | |
This work presents an analysis of different methodologies to perform the reduction of secondary arc currents (Isec) in little more than a half wavelength transmission lines under the condition of single-phase faults. The reduction of the amplitude of the secondary arcs is a primordial requirement to become viable the use of the single-pole auto-reclosing in these electrical systems. Thus, it is ensured that during the occurrence of a single-phase fault, some of the power continues to be transmitted, helping to maintain the stability and reliability of the transmission system. Strong inductive and capacitive couplings are present between the phases of little more than a half wavelength transmission line due to its great physical length. These couplings contribute to induce voltage and current by the operating phases into the phase with the fault, so that the electric arc formed between the phase and the ground does not extinguishes. Using simulations in the MATLAB® program and in the RTDS® simulator were evaluated the secondary arc currents characteristics in a transmission line of 1000 kV subjected to single-phase faults and studied ways to reduce the amplitude of these currents. The use of fast earthing switches along the transmission line effectively reduces the current value of the arc, however, for this, a large number of elements are required along the entire length of the line, what reduce the reliability and robustness of the system. The solution that best fits the system was the use of Zero Sequence Blocking Transformer (ZSBT). With the use of these transformers there was an expressive reduction in the amplitude of secondary arc currents at levels which their extinction can occur naturally in a 1000 kV transmission line (AU) | |
| FAPESP's process: | 12/03312-0 - DEVELOPMENT OF PROTECTION FOR LINES WITH A LITTLE MORE THAN HALF WAVELENGTH |
| Grantee: | Elson Costa Gomes |
| Support Opportunities: | Scholarships in Brazil - Doctorate |