Hivatkozási szám

MSZ EN 60909-0:2001

Dokumentumazonosító

116877

Cím

Zárlati áramok háromfázisú váltakozó áramú rendszerekben. 0. rész: Az áramok számítása (IEC 60909-0:2001)

Angol cím

Short-circuit current in three-phase a.c. systems. Part 0: Calculation of currents (IEC 60909-0:2001)

Alkalmazási terület

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. This part of IEC 60909 deals with the calculation of short-circuit currents in the case of balanced or unbalanced short circuits. In case of an accidental or intentional conductive path between one line conductor and local earth, the following two cases must be clearly distinguished with regard to their different physical properties and effects (resulting in different requirements for their calculation): line-to-earth short circuit, occurring in a solidly earthed neutral system or an impedance earthed neutral system; ? a single line-to-earth fault, occurring in an isolated neutral earthed system or a resonance earthed neutral system. This fault is beyond the scope of, and is therefore not dealt with in, this standard. For currents during two separate simultaneous single-phase line-to-earth short circuits in an isolated neutral system or a resonance earthed neutral system, see IEC 60909-3. Short-circuit currents and short-circuit impedances may also be determined by system tests, by measurement on a network analyzer, or with a digital computer. 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.

ICS

17.220.01 Villamosság. Mágnesség. Általános szempontok

Műszaki Bizottság

A szabvány nyelve

angol

Az érvényesség kezdete

2001-12-01

A visszavonás napja

2019-06-10

Forrás

idt IEC 60909-0:2001; idt EN 60909-0:2001

Előd

MSZ HD 533 S1:2000

Utód

MSZ EN 60909-0:2016

Módosítás

Kiegészítő információk

SZK-közlemények

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