Safety of power transformers, power supply units and similar devices - Part 2-20: Particular requirements for small reactors

This part of EN 61558 applies to stationary or portable, single-phase or poly-phase, air-cooled (natural or forced) general purpose small reactors, including alternating current, premagnetised and current compensated reactors, independent or associated, having a rated supply voltage not exceeding 1000 V a.c. or d.c. and rated frequency not exceeding 1 MHz, the rated power not exceeding - 2 kVAR a.c. (2 kW d.c.) for single-phase reactors; - 10 kVAR a.c. (10 kW d.c.) for poly-phase reactors. This part 2-20 is intended to be used in conjunction with EN 61558-1. It has the status of a group safety publication in accordance with IEC Guide 104.

Sicherheit von Transformatoren, Netzgeräten und dergleichen - Teil 2-20: Besondere Anforderungen an Kleindrosseln

Sécurité des transformateurs, blocs d'alimentation et dispositifs analogues - Partie 2-20: Règles particulières pour les petites bobines d'inductance

La présente partie de la EN 61558 est applicable aux petites bobines d'inductance fixes ou mobiles, monophasées ou polyphasées, généralement à refroidissement par air (circulation naturelle ou forcée), pour usage général, incluant les bobines d'inductance à courant alternatif, prémagnétisées et à courant compensé, indépendantes ou associées, ayant une tension primaire assignée n'excédant pas 1000 V en courant alternatif ou en courant continu, une fréquence assignée n'excédant pas 1 MHz et une puissance assignée n'excédant pas - 2 kVAR en courant alternatif (2 kW en courant continu) pour les bobines d'inductance monophasées; - 10 kVAR en courant alternatif (10 kW en courant continu) pour les bobines d'inductance polyphasées. La présente partie 2-20 est destinée à être utilisée avec la EN 61558-1. Elle a le statut de publication groupée de sécurité conformément au Guide CEI 104.

Safety of power transformers, power supply units and similar devices - Part 2-20: Particular requirements for small reactors (IEC 61558-2-20:2000)

General Information

Status
Withdrawn
Publication Date
26-Nov-2000
Current Stage
6060 - Document made available
Start Date
27-Nov-2000
Completion Date
27-Nov-2000

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SLOVENSKI SIST EN 61558-2-20:2001
prva izdaja
STANDARD
oktober 2001

Safety of power transformers, power supply units and similar devices - Part 2-20:

Particular requirements for small reactors (IEC 61558-2-20:2000)
ICS 29.180 Referenčna številka
SIST EN 61558-2-20:2001(en)

© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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NORME CEI
INTERNATIONALE IEC
61558-2-20
INTERNATIONAL
Première édition
STANDARD
First edition
2000-06
PUBLICATION GROUPÉE DE SÉCURITÉ
GROUP SAFETY PUBLICATION
Sécurité des transformateurs,
blocs d'alimentation et dispositifs analogues –
Partie 2-20:
Règles particulières pour les petites bobines
d'inductance
Safety of power transformers,
power supply units and similar devices –
Part 2-20:
Particular requirements for small reactors
 IEC 2000 Droits de reproduction réservés  Copyright - all rights reserved

Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in

utilisée sous quelque forme que ce soit et par aucun procédé, any form or by any means, electronic or mechanical,

électronique ou mécanique, y compris la photocopie et les including photocopying and microfilm, without permission in

microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
PRICE CODE
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue
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61558-2-20  IEC:2000 – 3 –
CONTENTS
Page

FOREWORD .......................................................................................................................... 5

Clause

1 Scope .............................................................................................................................. 9

2 Normative references ..................................................................................................... 11

3 Definitions...................................................................................................................... 11

4 General requirements..................................................................................................... 15

5 General notes on tests ................................................................................................... 15

6 Ratings .......................................................................................................................... 15

7 Classification .................................................................................................................15

8 Marking and other information ........................................................................................ 17

9 Protection against accessibility to hazardous live parts ................................................... 19

10 Change of input voltage setting ...................................................................................... 19

11 Output voltage and output current under load ................................................................. 21

12 No-load output voltage ................................................................................................... 21

13 Short-circuit voltage ....................................................................................................... 21

14 Heating .......................................................................................................................... 21

15 Short-circuit and overload protection .............................................................................. 23

16 Mechanical strength ....................................................................................................... 25

17 Protection against harmful ingress of dust, solid objects and moisture ............................ 25

18 Insulation resistance and dielectric strength.................................................................... 27

19 Construction................................................................................................................... 27

20 Components................................................................................................................... 27

21 Internal wiring ................................................................................................................ 29

22 Supply connection and other external flexible cords ........................................................ 29

23 Terminals for external conductors................................................................................... 29

24 Provision for protective earthing ..................................................................................... 29

25 Screws and connections................................................................................................. 29

26 Creepage distances, clearances and distances through insulation .................................. 29

27 Resistance to heat, abnormal heat, fire and tracking....................................................... 29

28 Resistance to rusting...................................................................................................... 29

Annexes ............................................................................................................................. 31

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61558-2-20  IEC:2000 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
SAFETY OF POWER TRANSFORMERS,
POWER SUPPLY UNITS AND SIMILAR DEVICES –
Part 2-20: Particular requirements for small reactors
FOREWORD

1) The IEC (International Electrotechnical Commission) is a world-wide organisation for standardisation comprising all

national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-

operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition

to other activities, the IEC publishes International Standards. Their preparation is entrusted to technical committees;

any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International,

governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC

collaborates closely with the International Organisation for Standardisation (ISO) in accordance with conditions

determined by agreement between the two organisations.

2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all interested

National Committees.

3) The documents produced have the form of recommendations for international use and are published in the form of

standards, technical specifications, technical reports or guides and they are accepted by the National Committees in

that sense.

4) In order to promote international unification, IEC National Committees undertake to apply IEC International Standards

transparently to the maximum extent possible in their national and regional standards. Any divergence between the

IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter.

5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with one of its standards.

6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of

patents rights. The IEC shall not be held responsible for identifying any or all such patents rights.

International standard IEC 61558-2-20 has been prepared by technical committee 96: Small

power transformers, reactors and power supply units: safety requirements.

It has the status of a group safety publication in accordance with IEC Guide 104: Guide for the

drafting of safety standards, and the role of committees with safety pilot functions and safety

group functions (1984).
The text of this standard is based on the following documents:
FDIS Report on voting
96/146/FDIS 96/149/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.

Future standards in this series will carry the new general title as cited above. Titles of existing

standards in this series will be updated at the time of the next edition.
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61558-2-20  IEC:2000 – 7 –

This part 2-20 is intended to be used in conjunction with IEC 61558-1. It was established on the

basis of the first edition (1997) of that standard.

This part 2-20 supplements or modifies the corresponding clauses in IEC 61558-1, so as to

convert that publication into the IEC standard: Particular requirements for small reactors.

When a particular subclause of part 1 is not mentioned in this part 2-20, that subclause applies

as far as is reasonable. Where this standard states "addition", "modification" or "replacement",

the relevant text of part 1 is to be adapted accordingly.
In this standard, the following print types are used:
– requirements proper: in roman type;
– test specifications: in italic type;
– explanatory matter: in smaller roman type.
In the text of the standard the words in bold are defined in clause 3.

Subclauses which are additional to those in part 1 are numbered starting from 101;

supplementary annexes are entitled AA, BB, etc.

The committee has decided that the contents of this publication will remain unchanged until

2004-12. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
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61558-2-20  IEC:2000 – 9 –
SAFETY OF POWER TRANSFORMERS,
POWER SUPPLY UNITS AND SIMILAR DEVICES –
Part 2-20: Particular requirements for small reactors
1 Scope
Replacement:

This part of IEC 61558 applies to stationary or portable, single-phase or poly-phase, air-cooled

(natural or forced) general purpose small reactors, including alternating current,

premagnetised and current compensated reactors, independent or associated, having a rated

supply voltage not exceeding 1 000 V a.c. or d.c. and rated frequency not exceeding 1 MHz,

the rated power not exceeding
– 2 kVAR a.c. (2 kW d.c.) for single-phase reactors;
– 10 kVAR a.c. (10 kW d.c.) for poly-phase reactors.

This standard is also applicable to small reactors without limitation of the rated power;

however, such small reactors are considered as special reactors and are subjected to an

agreement between the purchaser and the supplier.

This standard is applicable to dry-type small reactors. The windings may be encapsulated or

non-encapsulated.
This standard does not apply to
– reactors covered by IEC 60289;
– ballast for tubular fluorescent lamps covered by IEC 60920;

– ballast for discharge lamps (excluding tubular fluorescent lamps) covered by IEC 60922.

NOTE 1 For small reactors filled with liquid dielectric or pulverised material such as sand, additional requirements

are under consideration.

NOTE 2 In locations where special environmental conditions prevail, particular requirements may be necessary.

NOTE 3 Normally, small reactors are intended to be associated with equipment for functional requirements of the

equipment or requirements by the installation rules or by other appliance specifications.

NOTE 4 Small reactors incorporating electronic circuits and components are also covered by this standard.

NOTE 5 The safety insulation may be provided (or completed) by other parts or features of the equipment, such as

the body.

NOTE 6 Small reactors for particular applications will in the future be covered by complementary normative

annexes.
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61558-2-20  IEC:2000 – 11 –
2 Normative references
This clause of part 1 is applicable.
3 Definitions
This clause of part 1 is applicable except as follows:
Modification:

Where part 1 is applicable, the word "transformer", if used, shall be replaced by "reactor".

Addition:
3.1.101
reactor

arrangement comprising one or more windings with an impedance depending on the frequency,

working in accordance with the principle of self-induction whereby a magnetising current

generates a magnetic field through a magnetically effective core or through air
NOTE Reactors with toroïdal core are also included in this definition.
3.1.102
alternating current reactor

reactor in which the magnetising current generates an alternating magnetic field, changing its

polarity depending on the frequency
3.1.103
premagnetised reactor

reactor in which the magnetising direct current generates a magnetic field of only one polarity,

while a superimposed alternating current alters the direct magnetic field depending on its

strength and the frequency
3.1.104
current compensated reactor

reactor with at least two windings on a common core, where the magnetising currents are in

opposite directions in order to reduce the magnetic flux
3.1.105
overload proof reactor
in which the temperature does not exceed the specified limits when the is
reactor reactor

overloaded and which continues to meet all requirements of this standard after the removal of

the overload
3.1.105.1
non-inherently overload proof reactor

overload proof reactor equipped with a protective device which opens the circuit, or reduces

the current in the circuit when the reactor is overloaded, and which continues to meet all

requirements of this standard after the removal of the overload and resetting or replacing of the

protective device

NOTE 1 Examples of protective devices are fuses, overload releases, thermal fuses, thermal links, thermal cut-

outs, PTC resistors and automatic circuit-breakers.

NOTE 2 In case of protection by a device which cannot be replaced nor re-set, the wording "continues to meet all

requirements of this standard after removal of the overload" does not imply that the reactor continues to operate.

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61558-2-20  IEC:2000 – 13 –
3.1.105.2
inherently overload proof reactor

overload proof reactor not equipped with a device to protect the reactor and in which the

temperature in the case of overload, by construction, does not exceed the specified limits and

which continues to operate and meet all the requirements of this standard after the removal of

the overload
3.1.106
non-overload proof reactor

reactor which is intended to be protected against excessive temperature by means of a

protective device not provided with the reactor and which continues to meet all the

requirements of this standard after the removal of the overload and resetting or replacing of the

protective device
3.1.107
fail-safe reactor

reactor which, after abnormal use, permanently fails to function by an interruption of the failing

circuit but presents no danger
...

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