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BS EN 60909-0:2016

Current
Current

The latest, up-to-date edition.

Short-circuit currents in three-phase a.c. systems Calculation of currents
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

06-30-2016

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols, subscripts and superscripts
5 Characteristics of short-circuit currents: calculating
   method
6 Short-circuit impedances of electrical equipment
7 Calculation of initial short-circuit current
8 Calculation of peak short-circuit current
9 Calculation of symmetrical breaking current
10 DC component of the short-circuit current
11 Calculation of steady-state short-circuit current
12 Short circuits at the low-voltage side of transformers,
   if one line conductor is
interrupted at the high-voltage side
13 Terminal short circuit of asynchronous motors
14 Joule integral and thermal equivalent short-circuit
   current
Annex A (normative) - Formulas for the calculation of the
        factors m and n
Annex B (informative) - Nodal admittance and nodal
        impedance matrices
Bibliography
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

Pertains to the calculation of short-circuit currents - in low-voltage three-phase AC systems, and - in high-voltage three-phase AC systems, operating at a nominal frequency of 50 Hz or 60 Hz.

This part of IEC60909 is applicable to the calculation of short-circuit currents in low-voltage three-phase AC systems, and in high-voltage three-phase AC systems, operating at a nominal frequency of 50Hz or 60Hz. Systems at highest voltages of 550kV and above with long transmission lines need special consideration. This part of IEC60909 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 IEC60909 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 IEC60909 . 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 IEC60909‑3 . 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. NOTE The current in a three-phase short circuit is assumed to be made simultaneously in all poles. Investigations of non-simultaneous short circuits, which may lead to higher aperiodic components of short-circuit current, are beyond the scope of this part of IEC60909 . This part of IEC60909 does not cover short-circuit currents deliberately created under controlled conditions (short-circuit testing stations). This part of IEC60909 does not deal with the calculation of short-circuit currents in installations on board ships and aeroplanes.

Committee
W/-
DevelopmentNote
Supersedes BS 7639(1993) and 96/216008 DC (11/2001) Supersedes 12/30270636 DC. (06/2016)
DocumentType
Standard
Pages
80
PublisherName
British Standards Institution
Status
Current
Supersedes

Standards Relationship
I.S. EN 60909-0:2016 Identical
DIN EN 60909-0 : 2016 Identical
NBN EN 60909-0 : 2016 Identical
NF EN 60909-0 : 2016 Identical
EN 60909-0:2016 Identical
IEC 60909-0:2016 Identical

ENA ER P25 : ISSUE 2 2018 THE SHORT-CIRCUIT CHARACTERISTICS OF SINGLE-PHASE AND THREE-PHASE LOW VOLTAGE DISTRIBUTION NETWORKS
07/30130630 DC : 0 BS 7430 - CODE OF PRACTICE FOR EARTHING
11/30249994 DC : DRAFT JULY 2011 BS 7430 - CODE OF PRACTICE FOR PROTECTIVE EARTHING OF ELECTRICAL INSTALLATIONS

IEC 60038:2009 IEC standard voltages
IEC 60050-131:2002 International Electrotechnical Vocabulary (IEV) - Part 131: Circuit theory
IEC 60986:2000+AMD1:2008 CSV Short-circuit temperature limits of electric cables with rated voltages from 6 kV (<em>U</em><sub>m</sub> = 7,2 kV) up to 30 kV (<em>U</em><sub>m</sub> = 36 kV)
IEC 60909-3:2009 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
IEC 60050-195:1998 International Electrotechnical Vocabulary (IEV) - Part 195: Earthing and protection against electric shock
EN 60909-3:2010 Short-circuit currents in three-phase a.c systems - Part 3: Currents during two separate simultaneous line-to-earth short-circuits and partial short-circuit currents flowing through earth
IEC TR 60909-1:2002 Short-circuit currents in three-phase a.c. systems - Part 1: Factors for the calculation of short-circuit currents according to IEC 60909-0
IEC 60050-151:2001 International Electrotechnical Vocabulary (IEV) - Part 151: Electrical and magnetic devices
IEC 60909-3 : 3.0 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
IEC 60949:1988 Calculation of thermally permissible short-circuit currents, taking into account non-adiabatic heating effects
IEC 60865-1:2011 Short-circuit currents - Calculation of effects - Part 1: Definitions and calculation methods
IEC TR 60909-4:2000 Short-circuit currents in three-phase a.c. systems - Part 4: Examples for the calculation of short-circuit currents
EN 62428 : 2008 ELECTRIC POWER ENGINEERING - MODAL COMPONENTS IN THREE-PHASE A.C. SYSTEMS - QUANTITIES AND TRANSFORMATIONS
EN 60865-1:2012 Short-circuit currents - Calculation of effects - Part 1: Definitions and calculation methods
IEC 62428:2008 Electric power engineering - Modal components in three-phase a.c. systems - Quantities and transformations
EN 60038 : 2011 CENELEC STANDARD VOLTAGES (IEC 60038:2009, MODIFIED)

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