CEI EN 60909-3 : 2011
Current
The latest, up-to-date edition.
SHORT-CIRCUIT CURRENTS IN THREE-PHASE A/C SYSTEMS - PART 3: CURRENTS DURING TWO SEPARATE SIMULTANEOUS LINE-TO-EARTH SHORTCIRCUITS AND PARTIAL SHORT-CIRCUIT CURRENTS FLOWING THROUGH EARTH
Hardcopy , PDF
English - Italian
01-01-2011
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INTRODUCTION
1. Scope and object
2. Normative references
3. Terms and definitions
4. Symbols
5. Calculation of currents during two separate
simultaneous line-to-earth short circuits
6. Calculation of partial short-circuit currents
flowing through earth in case of an
unbalanced short circuit
7. Reduction factor for overhead lines with
earth wires
8. Calculation of current distribution and reduction
factor in case of cables with metallic sheath or
shield earthed at both ends
Annex A (informative) - Example for the calculation
of two separate simultaneous lineto-
earth short-circuit currents
Annex B (informative) - Examples for the calculation
of partial short-circuit currents
through earth
Annex C (informative) - Example for the calculation
of the reduction factor r1 and the current
distribution through earth in case of a
three-core cable
Annex D (informative) - Example for the calculation
of the reduction factor r[3] and the current
distribution through earth in case of three
single-core cables
Annex ZA (normative) - Normative references to
international publications
with their corresponding
European publications
Describes the procedures for calculation of the prospective short-circuit currents with an unbalanced short circuit in high voltage three-phase a.c. systems operating at nominal frequency 50 Hz or 60 Hz.
| Committee |
CT 99
|
| DevelopmentNote |
Classificazione CEI 99-1. (06/2005) To be read in conjunction with CEI EN 60909-0. (05/2011)
|
| DocumentType |
Standard
|
| Pages |
64
|
| PublisherName |
Comitato Elettrotecnico Italiano
|
| Status |
Current
|
| Standards | Relationship |
| EN 60909-3:2010 | Identical |
| IEC 60909-3:2009 | Identical |
| IEC TR 60909-2:2008 | Short-circuit currents in three-phase a.c. systems - Part 2: Data of electrical equipment for short-circuit current calculations |
| IEC 60909-0:2016 | Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents |
| EN 60909-0:2016 | Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents |
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