Transformadores MT/BT: teoria e exemplos de cálculo da corrente de curto-circuito

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Transformadores MT/BT: teoria e exemplos de cálculo da corrente de curto-circuito

Publicado: 17 de julho de 2013 · Categoria: Technical Papers

Deste documento

2 Technical Application Papers February 2008 1SDC007101G0202 MV/LV transformer substations: theory and examples of short-circuit calculation MV/LV transformer substations: theory and examples of short-circuit calculation Index 1 General information on MV/LV 3 Choice of protection and transformer substations control devices 1.1 Classic typologies ....................................... 2 1.2 General considerations about MV/LV transformers................................................. 5 1.3 MV protection devices: observations about the limits imposed by the utility companies....8 1.4 LV protection devices . ................................ 8 3.1 Generalities about the main electrical parameters of the protection and control devices .................................................... 17 3.2 Criteria for the circuit-breaker choice........ 19 3.3 Coordination between circuit-breakers and switch-disconnectors.......................... 21 3.4 Coordination between automatic circuit- breakers-residual current devices (RCDs)....22 2 Calculation of short-circuit currents 2.1 Data necessary for the calculation ........... 11 2.2 Calculation of the short-circuit current...... 12 2.3 Calculation of motor contribution ............. 15 2.4 Calculation of the peak current value ...... 15 3.5 Example of study of a MV/LV network ...... 23 Annex A: Calculation of the transformer inrush current......... 30 Annex B: Example of calculation of the short-circuit...