-
-
Available Formats
- Options
- Availability
- Priced From ( in USD )
-
Available Formats
-
- Secure PDF 🔒
- Immediate download
-
$398.78Members pay $299.09
- Add to Cart
-
- Printed Edition
- Ships in 1-2 business days
-
$398.78Members pay $299.09
- Add to Cart
-
- Printed Edition + PDF
- Immediate download
-
$538.48Members pay $403.86
- Add to Cart
Customers Who Bought This Also Bought
-
BS EN 60909-3:2010
Priced From $368.30 -
BS EN 60038:2011
Priced From $190.50 -
BS PD IEC TR 62051:1999
Priced From $368.30 -
BS EN 60947-4-3:2014
Priced From $398.78
About This Item
Full Description
- in low-voltage three-phase AC systems, and
- in high-voltage three-phase AC systems,
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.
A single line-to-earth fault is beyond the scope of this part of IEC 60909.
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 analyser, 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.
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 types short-circuit currents, which differ in their magnitude, are considered:
- 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.
This part of IEC 60909 does not cover short-circuit currents deliberately created under controlled conditions (short-circuit testing stations).
This part of IEC 60909 does not deal with the calculation of short-circuit currents in installations on board ships and aeroplanes.
Cross References:
IEC 60038:2009
IEC 60050-131
IEC TR 60909-1:2002
IEC TR 60909-2:2008
IEC 60909-3:2009
IEC TR 60909-4:2000
EN 60038:2011
EN 60909-3:2010
IEC 60050-151:2001
IEC 60050-195:1998
IEC 60050-195:1998/AMD1:2001
IEC 60865-1
IEC 62428
IEC 60949
IEC 60986
EN 60865-1
EN 62428
All current amendments available at time of purchase are included with the purchase of this document.
Document History
-
BS EN 60909-0:2016
viewing
Short-circuit currents in three-phase a.c. systems-Calculation of currents- Most Recent
-
BS 12/30270636 DC
BS EN 60909-0. Short-circuit currents in three.phase A.C. systems. Calculation of currents- Historical Version
-
BS EN 60909-0:2001
Short-circuit currents in three-phase a.c. systems-Calculation of currents- Historical Version
-
BS 7639:1993
Short-circuit current calculation in three-phase a.c. systems- Historical Version