CE1 IEC (Première édition – ) (First edition – ) Courants de court-circuit dans les réseaux Short-circuit currents in three-phase. IEC Edition INTERNATIONAL. STANDARD. NORME. INTERNATIONALE. Short-circuit currents in three-phase a.c. systems –. Buy IEC SHORT-CIRCUIT CURRENTS IN THREE-PHASE A.C. SYSTEMS – PART 0: CALCULATION OF CURRENTS from SAI Global.

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## Short Circuits in Power Systems: A Practical Guide to IEC 60909-0, 2nd Edition

I In the case of minimum steady-state short circuits introduce c see 2. 60099-0 IEC collaborates closely with the International Organization for Standardization ISO in accordance with conditions determined by agreement between the two organizations.

Currents during two separate simultaneous single-phase line-to-earth short circuits and partial short-circuit currents following through earth IEC TR The effect of series capacitors can be neglected in the calculation of short-circuit currents, if they are equipped with voltage-limiting devices in parallel, acting if a short circuit occurs.

Impedances 2, between the starpoint of transformers and earth are to be introduced as 3 2, into the zero-sequence system 6909-0 a correction factor.

You are currently using the site but have requested a page in the site. This part of IEC deals with the calculation of short-circuit currents in the case of balanced or unbalanced short circuits. Read an Excerpt Excerpt 1: 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.

Calculate the Impedance 8. Calculation of Short-Circuit Currents This part of IEC does not deal with the calculation of short-circuit currents in installations on board ships and aeroplanes. I librarian researcher I design engineer safety engineer ci Q7 Please assess the standard in the I following categories, using testing engineer ci the numbers: Calculation of currents 1 General 1. The effective resistance per unit length RL of overhead lines at the conductor temperature 20 “C may be calculated from the nominal cross-section qn and the resistivity p: I 1 unacceptable, marketing specialist other In a near-to-generator short circuit, the short-circuit current behaves generally as shown in figure 2.

For other ,values of minimum time delay, linear interpolation between curves is acceptable.

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In general, two short-circuit currents, which differ in their magnitude, are to be calculated: Systems at highest voltages of kV and above with long transmission lines need special consideration. For simplification of the calculation, groups of motors including their connection cables may be combined to a iex equivalent motor see motor M4 in figure 9.

Short circuits may have one or more sources, as shown in figures 11, 12, and Impedances between a starpoint and earth shall be introduced without correction factor. In all cases I L is equal to Ikv,because the short circuits are far-from-generator short circuits see 1. Sequential short circuits are not considered. An example for the ie of the correction factors of equation 13 to the positive-sequence and the zero-sequence system impedances of the equivalent circuits is given in 2.

He published 17 books in German, English and Turkish and more than 64 international scientific publications. Additional information may be found in IEC When calculating the idc short-circuit current I: Medium-voltage motors have to be considered in the calculation of maximum short-circuit current see 2.

Neglecting the -zero-sequence capacitances of lines in earthed neutral systems leads to results which are slightly higher than the real values of the short-circuit currents. The impedance iev the auxiliary transformer AT in figure 13 is to be corrected with KT from 3. In the case of a near-to-generator short circuit, the short-circuit current can be considered as the sum of the following two components: The factor p may also be obtained from figure They do not contribute to the symmetrical 60909-00 breaking current I, and the steady-state short-circuit current I k.

Any divergence between the IEC Standard and 69009-0 corresponding national or regional standard shall be clearly indicated in the latter. The initial short-circuit current at the short-circuit location F is the phasor sum of the individual partial short-circuit currents see figure