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Reference EN 62428:2008
Title Electric power engineering - Modal components in three-phase a.c. systems - Quantities and transformations
Project Number 20905
Abstract/Scope IEC 62428:2008 deals with transformations from original quantities into modal quantities for the widely used three-phase a.c. systems in the field of electric power engineering. The examination of operating conditions and transient phenomena in three-phase a.c. systems becomes more difficult by the resistive, inductive or capacitive coupling between the phase elements and line conductors. Calculation and description of these phenomena in three-phase a.c. systems are easier if the quantities of the coupled phase elements and line conductors are transformed into modal quantities. The calculation becomes very easy if the transformation leads to decoupled modal systems. The original impedance and admittance matrices are transformed to modal impedance and admittance matrices. In the case of decoupling of the modal quantities, the modal impedance and admittance matrices become diagonal matrices.


Current Stage code 6060
Current Stage code date 2008-09-25
Current Stage code deadline 2009-05-01
Deadline date for vote  


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IEC Technical Body IEC/TC 25
Reference Document IEC 62428:2008 (EQV)
ICS 01.060 - Quantities and units
29.020 - Electrical engineering in general
Keywords Power engineering; Modal components; Three-phase; AC system
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2008-09-25 2009-05-01 export to doc file  EN  FR  DE
5099 2008-08-01 2008-10-01  
5060 2008-07-07 2008-07-21 export to doc file  EN
5020 2008-05-02 2008-07-04  
3090 2007-07-06 2007-09-30  
5060 2007-03-05 2007-03-19 export to doc file  EN
5020 2006-09-29 2007-03-02  
1090 2006-09-26 2006-09-29  

Implementation Dates

date of Ratification (DOR) (1) 2008-08-01
date of Availability (DAV) (2) 2008-09-25
date of Announcement (DOA) (3) 2008-11-01
date of Publication (DOP) (4) 2009-05-01
date of Withdrawal (DOW) (5) 2011-08-01


Superseded by  
Normative reference (6) IEC 60050-141:2004

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved

(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat

(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level

(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement

(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn

(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.