IEC 60909 0 PDF GENERATOR

This part of IEC does not deal with the calculation of short-circuit currents in installations on board ships and aeroplanes. I certification technical documentation ci ci Short-circuit current-limiting reactors shall be treated as a part of the short-circuit impedance. It is only necessary to choose the branches 609009-0 carry partial short-circuit currents at the nominal voltage corresponding to the short-circuit location and branches with transformers adjacent to the short-circuit location. In existing low-voltage systems it is possible to determine the short-circuit impedance on the basis of measurements at the location of the prospective short circuit considered.

IEC 60909 0 PDF GENERATOR

The generator impedance shall be transferred to the high-voltage side using the rated transformation ratio t. IEC | IEC WebstoreР”Р‡or the effective reactance of the generators, introduce: Example of a meshed network fed from several sources In the case of high-voltage feeders with nominal voltages above 35 kV fed by overhead lines, the equivalent impedance 2, may in many cases be considered as a reactance, i. If the long-term operating conditions of network transformers before the short circuit are known for sure, then the 609090 equation 12b may be used instead of equation 12a. For higher temperatures than 20 OC, see equation 3. Synchronous machines generators, motors, or compensators with terminal-fed static exciters do not contribute to I k in the case of a short-circuit at the terminals of the machine, but uec contribute to l k if there is an impedance between the terminals and the short-circuit location.Р”Р‡or simplification, it is permitted to use the same value for IC as for the three- phase short circuit. Calcul des courants Part O: During the initial stage of the short circuit, the negative impedance is approximately equal to the positive-sequence impedance, independent of whether the short circuit is a near-to-generator or a far-from-generator short circuit. This phenomenon is not dealt with in this standard. SYSTEMS РІР‚вЂњ PART 0: CALCULATION OF CURRENTS from SAI Global. Buy IEC SHORT-CIRCUIT CURRENTS IN THREE-PHASE A.C. Short-circuit currents in three-phase a.c. CE1 IEC (PremiР“РЃre Р“В©dition РІР‚вЂњ ) (First edition РІР‚вЂњ ) Courants de court-circuit dans les rР“В©seaux Short-circuit currents in three-phase.

Iec 60909-0 pdf