IEC 61071:2017 pdf download

IEC 61071:2017 pdf download.Capacitors for power electronics
1 Scope
This International Standard applies to capacitors for power electronics applications. The operating frequency of the systems in which these capacitors are used is usually up to 1 5 kHz, while the pulse frequencies may be up to 5 to 1 0 times the operating frequency. The document distinguishes between AC and DC capacitors which are considered as components when mounted in enclosures. This document covers an extremely wide range of capacitor technologies for numerous applications, e.g. overvoltage protection, DC and filtering, switching circuits, energy storage, auxiliary inverters, etc. The following are excluded from this document: • capacitors for induction heat-generating plants operating at frequencies range up to 50 kHz (see IEC 601 1 0-1 and IEC 601 1 0-2); • capacitors for motor applications and the like (see IEC 60252-1 and IEC 60252 -2); • capacitors to be used in circuits for blocking one or more harmonics in power supply networks; • small AC capacitors as used for fluorescent and discharge lamps (see IEC 61 048 and IEC 61 049); • capacitors for suppression of radio interference (see IEC 60384-1 4); • shunt capacitors for AC power systems having a rated voltage above 1 000 V (see the IEC 60871 standards); • shunt power capacitors of the self-healing type for AC systems having a rated voltage up to and including 1 000 V (see IEC 60831 -1 and IEC 60831 -2); • shunt power capacitor of the non-self-healing type for AC systems having a rated voltage up to and including 1 000 V (see the IEC 60931 standards); • electronic capacitors not used in power circuits; • series capacitors for power systems (see IEC 601 43); • coupling capacitors and capacitors dividers (see IEC 60358); • capacitors for microwave ovens (see IEC 61 270-1 ); • capacitors for railway applications (see IEC 61 881 ). Examples of applications are given in 9.1 .
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 capacitor element (or element) device consisting essentially of two electrodes separated by a dielectric [SOURCE: IEC 60050-436:1 990, 436-01 -03] 3.2 capacitor unit (or unit) assembly of one or more capacitor elements in the same container with terminals brought out [SOURCE: IEC 60050-436:1 990, 436-01 -04] 3.3 capacitor bank number of capacitor units connected so as to act together [SOURCE: IEC 60050-436:1 990, 436-01 -06] 3.4 capacitor general term used when it is not necessary to state whether reference is made to an element, a unit or a capacitor bank 3.5 capacitor equipment assembly of capacitor units and their accessories intended for connection in power electronic equipment 3.6 capacitor for power electronics power capacitor intended to be used in power electronic equipment and capable of operating continuously under sinusoidal and non-sinusoidal current and voltage 3.7 metal-foil capacitor (non-self-healing) capacitor in which the electrodes usually consist of metal foils separated by a dielectric Note 1 to entry: In the event of a breakdown of the dielectric, the capacitor does not restore itself. 3.8 self-healing metallized dielectric capacitor capacitor, of which at least one electrode consists of a metallic deposit on the dielectric Note 1 to entry: In the event of local breakdown of the dielectric, the electric properties of the capacitor are rapidly and essentially self-restored. 3.9 AC capacitor capacitor essentially designed for operation with alternating voltage Note 1 to entry: AC capacitors may be used with DC voltage up to the rated voltage only when authorized by the capacitor manufacturer. 3.1 0 DC capacitor capacitor essentially designed for operation with direct voltage Note 1 to entry: DC capacitors may be used with a specified AC voltage only where authorized by the capacitor manufacturer. 3.1 1 model capacitor unit which simulates a complete unit or element in an electrical test, without reducing the severity of the electrical, thermal or mechanical conditions Note 1 to entry: The model unit may be of a different size from the complete unit. Note 2 to entry: The combined sum of stresses should always be considered, for instance the sum of temperature and mechanical conditions as well as electrical stresses. 3.1 2 internal (element) fuse fuse connected inside a capacitor unit, in series with an element or a group of elements [SOURCE: IEC 60050-436:1 990, 436-03-1 6]