Término solicitado: CORRIENTE MONOFASICA/(265,65,175)
2 Registro/s encontrado/s en CAT+NORMA
| Tipo de documento: | NORMA |
| Título: | SHORT-CIRCUIT CURRENTS IN THREE-PHASE A.C. SYSTEMS - PART 4: EXAMPLES FOR THE CALCULATION OF SHORT-CIRCUIT CURRENTS |
| Código de Doc.: | IEC/TR 60909-4 |
| Autor Inst.: | International Electrotechnical Commission. IEC |
| Fecha: | 2000 |
| Estado: | Para datos sobre la vigencia de esta norma haga clic aquí |
| Objeto: | This part of IEC 60909 is applicable to the calculation of short-circuit currents: in low-voltage three-phase a.c. systems in high-voltage three-phase a.c. systems operating at a nominal frequency of 50 Hz or 60 Hz. Systems at highest voltages of 550 kV and above with long transmission lines need special consideration. This part of IEC 60909 establishes a general, practicable and concise procedure leading to results, which are generally of acceptable accuracy. For this calculation method, an equivalent voltage source at the short-circuit location is introduced. This does not exclude the use of special methods, for example the superposition method, adjusted to particular circumstances, if they give at least the same precision. The superposition method gives the short-circuit current related to the one load flow presupposed. This method, therefore, does not necessarily lead to the maximum short-circuit current. The calculation of the short-circuit impedance is in general based on the rated data of the electrical equipment and the topological arrangement of the system and has the advantage of being possible both for existing systems and for systems at the planning stage. In general, two short-circuit currents, which differ in their magnitude, are to be calculated: the maximum short-circuit current which determines the capacity or rating of electrical equipment; and the minimum short-circuit current which can be a basis, for example, for the selection of fuses, for the setting of protective devices, and for checking the run-up of motors |
| ICS: | 17.220.01 Electricity. Magnetism. General aspects; 29.240.20 Power transmission and distribution lines |
| Idioma: | en;fr |
| Título en otro Idioma: | Courants de court-circuit dans les réseaux triphasés à courant alternatif - Partie 4: Exemples pour le calcul des courants de court-circuit |
| Edición: | first edition |
| Palabras Clave: | Electricidad; Corriente eléctrica; Corcocicuitos; Circuitos eléctricos; Corriente alterna; Corriente trifásica; Corriente monofásica |
| Páginas: | 131p. |
| Ingreso de la Info.: | 2012-11-22 |
| Para ver la norma completa busque en la base Normas (solo para personal del INTI) |
| Tipo de documento: | NORMA |
| Título: | SHORT-CIRCUIT CURRENTS IN THREE-PHASE AC SYSTEMS - PART 3: CURRENTS DURING TWO SEPARATE SIMULTANEOUS LINE-TO-EARTH SHORT CIRCUITS AND PARTIAL SHORT-CIRCUIT CURRENTS FLOWING THROUGH EARTH |
| Código de Doc.: | S+ IEC 60909-3 |
| Autor Inst.: | International Electrotechnical Commission. IEC |
| Fecha: | 2009 |
| Estado: | Para datos sobre la vigencia de esta norma haga clic aquí |
| Objeto: | IEC Standards+ 60909-3:2009 contains the International Standard and its Redline version. The Redline version provides you with a quick and easy way to compare all the changes between this standard and its previous edition. The Redline version is not an official IEC Standard, only the current version of the standard is to be considered the official document. IEC 60909-3:2009 specifies procedures for calculation of the prospective short-circuit currents with an unbalanced short circuit in high-voltage three-phase a.c. systems operating at nominal frequency 50 Hz or 60 Hz, i. e.: currents during two separate simultaneous line-to-earth short circuits in isolated neutral or resonant earthed neutral systems; partial short-circuit currents flowing through earth in case of single line-to-earth short circuit in solidly earthed or low-impedance earthed neutral systems.The currents calculated by these procedures are used when determining induced voltages or touch or step voltages and rise of earth potential at a station (power station or substation) and the towers of overhead lines. Procedures are given for the calculation of reduction factors of overhead lines with one or two earth wires. This edition constitutes a technical revision. The main changes with respect to the previous edition are: New procedures are introduced for the calculation of reduction factors of the sheaths or shields and in addition the current distribution through earth and the sheaths or shields of three-core cables or of three single-core cables with metallic non-magnetic sheaths or shields earthed at both ends; The information for the calculation of the reduction factor of overhead lines with earth wires are corrected and given in the new Clause 7; A new Clause 8 is introduced for the calculation of current distribution and reduction factor of three-core cables with metallic sheath or shield earthed at both ends; The new Annexes C and D provide examples for the calculation of reduction factors and current distribution in case of cables with metallic sheath and shield earthed at both ends |
| ICS: | 17.220.01 Electricity. Magnetism. General aspects; 29.240.20 Power transmission and distribution lines |
| Idioma: | en;fr |
| Título en otro Idioma: | Courants de court-circuit dans les réseaux triphasés à courant alternatif -- Partie 3: Courants durant deux courts-circuits monophasés simultanés séparés à la terre et courants de court-circuit partiels s'écoulant à travers la terre |
| Edición: | 3.0 |
| Palabras Clave: | Electricidad; Corriente eléctrica; Corcocicuitos; Circuitos eléctricos; Corriente alterna; Corriente trifásica; Corriente monofásica |
| Páginas: | 258p. |
| Ingreso de la Info.: | 2012-11-19 |
| Para ver la norma completa busque en la base Normas (solo para personal del INTI) |
Fin
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