Safety of transformers, reactors, power supply units and combinations thereof - Part 2-20: Particular requirements and tests for small reactors

IEC 61558-2-20:2010 deals with the safety of small reactors for general applications. This part is applicable to stationary or portable, single-phase or polyphase, air-cooled (natural or forced) general purpose reactors including alternating current, premagnetised and current compensated independent or associated reactors. This second edition cancels and replaces the first edition published in 2000. It constitutes a technical revision. The main changes consist of updating this part in accordance with IEC 61558-1:2005. This part has the status of a group safety publication in accordance with IEC Guide 104. The attention of National Committees is drawn to the fact that equipment manufacturers and testing organizations may need a transitional period following publication of a new, amended or revised IEC publication in which to make products in accordance with the new requirements and to equip themselves for conducting new or revised tests. It is the recommendation of the committee that the content of this publication be adopted for implementation nationally not earlier than 12 months from the date of publication. In the meantime, the previous edition can still be ordered by contacting your local IEC member National Committee or the IEC Central Office.
This publication is to be read in conjunction with IEC 61558-1:2005.

Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des combinaisons de ces éléments - Partie 2-20: Règles particulières et essais pour les petites bobines d'inductance

La CEI 61558-2-20:2010 traite de la sécurité des petites bobines d'inductance pour applications d'ordre général. La présente partie est applicable aux bobines d'inductance fixes ou mobiles, monophasées ou polyphasées, 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. Cette deuxième édition annule et remplace la première édition publiée en 2000. Elle constitue une révision technique. Les principales modifications consistent en la mise à jour de la présente partie conformément à la CEI 61558-1:2005. La présente partie a le statut de publication groupée de sécurité conformément au Guide CEI 104. L'attention des Comités Nationaux est attirée sur le fait que les fabricants d'appareils et les organismes d'essai peuvent avoir besoin d'une période transitoire après la publication d'une nouvelle publication CEI, ou d'une publication amendée ou révisée, pour fabriquer des produits conformes aux nouvelles exigences et pour adapter leurs équipements aux nouveaux essais ou aux essais révisés. Le comité recommande que le contenu de cette publication soit entériné au niveau national au plus tôt 12 mois après la date de publication. Pendant ce temps, l'édition précédente peut toujours être commandée auprès du Comité National CEI de votre pays ou auprès du bureau Central de la CEI.
Cette publication doit être lue conjointement avec l'IEC 61558-1:2005.

General Information

Status
Published
Publication Date
28-Jun-2010
Current Stage
PPUB - Publication issued
Start Date
29-Jun-2010
Completion Date
29-Jun-2010
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IEC 61558-2-20
Edition 2.0 2010-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety of transformers, reactors, power supply units and combinations thereof –
Part 2-20: Particular requirements and tests for small reactors
Sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et des
combinaisons de ces éléments –

Partie 2-20: Règles particulières et essais pour les petites bobines d'inductance

IEC 61558-2-20:2010
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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---------------------- Page: 2 ----------------------
IEC 61558-2-20
Edition 2.0 2010-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety of transformers, reactors, power supply units and combinations thereof –
Part 2-20: Particular requirements and tests for small reactors
Sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et des
combinaisons de ces éléments –

Partie 2-20: Règles particulières et essais pour les petites bobines d'inductance

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.180 ISBN 978-2-88912-038-3
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 61558-2-20 © IEC:2010
CONTENTS

FOREWORD...........................................................................................................................3

1 Scope...............................................................................................................................5

2 Normative references........................................................................................................6

3 Terms and definitions .......................................................................................................6

4 General requirements .......................................................................................................8

5 General notes on tests......................................................................................................8

6 Ratings.............................................................................................................................8

7 Classification ....................................................................................................................9

8 Marking and other information...........................................................................................9

9 Protection against electric shock.....................................................................................11

10 Change of input voltage setting .......................................................................................11

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

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

13 Short-circuit voltage........................................................................................................12

14 Heating...........................................................................................................................12

15 Short-circuit and overload protection ...............................................................................12

16 Mechanical strength........................................................................................................14

17 Protection against harmful ingress of dust, solid objects and moisture.............................14

18 Insulation resistance, dielectric strength and leakage current ..........................................14

19 Construction ...................................................................................................................14

20 Components ...................................................................................................................14

21 Internal wiring .................................................................................................................15

22 Supply connection and other external flexible cables or cords..........................................15

23 Terminals for external conductors ...................................................................................15

24 Provision for protective earthing......................................................................................15

25 Screws and connections .................................................................................................15

26 Creepage distances, clearances and distances through insulation ...................................15

27 Resistance to heat, fire and tracking ...............................................................................15

28 Resistance to rusting ......................................................................................................16

Annexes................................................................................................................................17

Bibliography ..........................................................................................................................17

---------------------- Page: 4 ----------------------
61558-2-20 © IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF TRANSFORMERS, REACTORS,
POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
Part 2-20: Particular requirements and tests for small reactors
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of 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, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). 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. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of 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 IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

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

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

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

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

Transformers, reactors, power supply units and combinations thereof.

This second edition cancels and replaces the first edition published in 2000. It constitutes a

technical revision. The main changes consist of updating this part in accordance with

IEC 61558-1:2005.

This part has the status of a group safety publication in accordance with IEC Guide 104:1997,

The preparation of safety publications and the use of basic safety publications and group

safety publications.
---------------------- Page: 5 ----------------------
– 4 – 61558-2-20 © IEC:2010
The text of this standard is based on the following documents:
FDIS Report on voting
96/356/FDIS 96/363/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 2.

This part is intended to be used in conjunction with the latest edition of IEC 61558-1 and its

amendments. It is based on the second edition (2005) of that standard.

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

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

A list of all parts of the IEC 61558 series, under the general title: Safety of transformers,

reactors, power supply units and combinations thereof, can be found on the IEC website.

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.

Where a particular subclause of Part 1 is not mentioned in this part, that subclause applies as

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

relevant text of Part 1 is to be adapted accordingly.
In this part, 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 this part, the words in bold are defined in Clause 3.

Subclauses, notes, figures and tables 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 the

stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to

the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

NOTE The attention of National Committees is drawn to the fact that equipment manufacturers and testing

organizations may need a transitional period following publication of a new, amended or revised IEC publication in

which to make products in accordance with the new requirements and to equip themselves for conducting new or

revised tests.

It is the recommendation of the committee that the content of this publication be adopted for implementation

nationally not earlier than 12 months from the date of publication.
---------------------- Page: 6 ----------------------
61558-2-20 © IEC:2010 – 5 –
SAFETY OF TRANSFORMERS, REACTORS,
POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
Part 2-20: Particular requirements and tests for small reactors
1 Scope
Replacement:

This part of IEC 61558 deals with the safety of small reactors for general applications.

NOTE 1 Safety includes electrical, thermal and mechanical aspects.

Unless otherwise specified, from here onward, the term transformer or reactor covers small

reactors.

This part is applicable to stationary or portable, single-phase or polyphase, air-cooled (natural

or forced) general purpose reactors including alternating current, premagnetised and current

compensated independent or associated reactors.

The rated supply voltage does not exceed 1 000 V a.c. or 1 500V ripple-free d.c., the rated

supply frequency and the internal operational frequencies do not exceed 1 MHz.
The rated power does not exceed:
– 25 kVAR a.c. (25 kW d.c.) for single-phase reactors,
– 50 kVAR a.c. (50 kW d.c.) for poly-phase reactors.

This part is applicable to reactors without limitations of the rated power subject to an

agreement between the purchaser and the manufacturer.

This part is applicable to dry-type reactors. The windings may be encapsulated or non-

encapsulated.
This part does not apply to:
– reactors covered by IEC 60289;
– ballast for tubular fluorescent covered by IEC 61347-2-8;
– ballast for discharge lamps (excluding tubular fluorescent lamps) covered by
IEC 61347-2-9.

NOTE 2 For reactors filled with liquid dielectric or pulverised material such as sand, additional requirements are

under consideration.
NOTE 3 Attention is drawn to the following:

- for reactors intended to be used in vehicles, on board ships, and aircraft, additional requirements (from other

applicable standards, national rules, etc.) may be necessary;

- measures to protect the enclosure and the components inside the enclosure against external influences such

as fungus, vermin, termites, solar-radiation, and icing should also be considered;

- the different conditions for transportation, storage, and operation of the reactor should also be considered;

---------------------- Page: 7 ----------------------
– 6 – 61558-2-20 © IEC:2010

- additional requirements in accordance with other appropriate standards and national rules may be applicable to

reactors intended for use in special environments, such as tropical environment.

NOT E 4 Norm al l y , 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 5 Reactors incorporating electronic circuits and components are also covered by this standard.

NOTE 6 The protection against electric shock may be provided (or completed) by other parts or features of the

equipment, such as the body.

NOTE 7 Reactors for particular applications will in the future be covered by complementary normative annexes.

NOTE 8 Future technological development of reactors may necessitate a need to increase the upper limit of the

frequencies, until then this part may be used as a guidance document.
2 Normative references
This clause of Part 1 is applicable except as follows:
Addition:

IEC 61558-1:2005, Safety of power transformers, power supplies, reactors and similar products

– Part 1: General requirements and tests
3 Terms and 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 toroidal 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
---------------------- Page: 8 ----------------------
61558-2-20 © IEC:2010 – 7 –
3.1.105
overload proof reactor

reactor in which the temperature does not exceed the specified limits when the reactor is

overloaded and 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.

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 to the user or surroundings
3.4 Circuits and windings
This subclause of Part 1 is not applicable.
3.5 Ratings
This subclause of Part 1 is applicable, except as follows:
Replacement:
3.5.4
rated current

rated current, assigned to the reactor by the manufacturer including harmonics, if any, which

influence the heating of the reactor
Addition:
3.5.101
rated power

sum of the products of the rated voltage drop and the rated current at the rated frequency

for the different windings
---------------------- Page: 9 ----------------------
– 8 – 61558-2-20 © IEC:2010
3.5.102
rated inductance

inductance of the reactor designed by the manufacturer for the specified operating condition

of the reactor

NOTE The specific operating conditions of d.c. reactors are determined by the d.c. component and the

superimposed a.c. component.
3.5.103
rated resistance

d.c. resistance of a winding of a reactor designed by the manufacturer for the specified

operating conditions of the reactor
3.5.104
rated voltage drop

voltage across a winding of the reactor at the rated current and the rated frequency

assigned by the manufacturer
3.6 No-load values
This subclause of Part 1 is not applicable.
3.7 Insulation
This subclause of Part 1 is applicable.
4 General requirements
This clause of Part 1 is applicable.
5 General notes on tests
This clause of Part 1 is applicable.
6 Ratings
Replacement:

6.1 The rated supply voltage shall not exceed 1 000 V a.c or 1 500 V ripple-free d.c..

6.2 The rated power shall not exceed 25 kVAR a.c. (25 kW d.c.) for single-phase reactors

and 50 kVAR a.c. (50 kW d.c.) for poly-phase reactors, except for reactors subject to an

agreement between the purchaser and the manufacturer.

6.3 The rated supply frequency and the internal operational frequencies does not exceed

100 MHz.

6.4 The values of rated inductance and rated resistance shall be given at the rated ambient

temperature, under no load conditions, and the tolerance shall be declared by the

manufacturer.

Compliance with the requirements of 6.1 to 6.4 is checked by inspection of the marking.

---------------------- Page: 10 ----------------------
61558-2-20 © IEC:2010 – 9 –
7 Classification
This clause of Part 1 is applicable, except as follows:
7.1 Replacement:
According to their protection against electric shock:
– class I reactors;
– class II reactors;
– class III reactors.

NOTE Incorporated reactors are not classified; their degree of protection against electric shock is determined by

the way in which the reactors are incorporated.
7.2 Replacement:
According to the protection against abnormal use:
– inherently overload proof reactors;
– non-inherently overload proof reactors;
– non overload proof reactors;
– fail-safe reactors.
8 Marking and other information
This clause of Part 1 is applicable, except as follows:
8.1 Replacement:
Reactors shall be marked with the following parameters:
a) rated supply voltage in volts (V);
b) rated supply frequency (ies) in Hertz (Hz):
c) rated voltage drop in volts (V) only for a.c. reactors;
d) rated power in VAR or kVAR for a.c., in watts (W) or kilowatts (kW) for d.c.;
e) rated current and harmonics, if any, in amperes (A) or milliamperes (mA);
f) symbol or abbreviation DC for nature of direct current, if applicable;
g) symbol or abbreviation AC for nature of alternating current, if applicable;

h) rated inductance of the winding(s) in henries (H) or millihenries (mH) for reactors followed

by the appropriate tolerance;

NOTE 1 Only one of the values c), d) or h) needs to be marked, as the others can be calculated from the given

values.
i) the reactor shall be marked with one of the graphical symbol shown in 8.11;

j) rated resistance of the winding(s) in ohms (Ω) or milliohms (mΩ) followed by the

appropriate tolerance;
NOTE 2 The marking j) may be given in the literature instead of being marked.
k) model or type references;
l) name or trademark of the manufacturer or responsible supplier;
---------------------- Page: 11 ----------------------
– 10 – 61558-2-20 © IEC:2010
m) indication of the protection index IP, if other than IP00;
n) rated maximum ambient temperature t , if other than 25 °C;

NOTE 3 It is recommended that the values of t are given in steps of 5 °C for t ≤50 °C and in steps of 10 °C for

>50 °C.

o) rated minimum ambient temperature t , if lower than +10 °C and if a temperature

amin
sensitive device is used;
NOTE 4 It is recommended that the values of t are given in steps of 5 °C.
amin

p) duty cycle, if any, unless the operating time is limited by the construction of the reactor or

corresponds to the operating conditions. The marking of short-time duty cycle or

intermittent duty cycle shall correspond to normal use. The operating time for reactors

with short-time duty shall be expressed in seconds (s) or minutes (min); the operating time

and the resting time of reactors with intermittent duty cycle shall be expressed in

seconds (s) or minutes (min), separated by an oblique stroke;
q) switching frequency (ies) of the supplying frequency inverter;

r) reactors to be used with forced air cooling where the fan is not a part of the reactor shall

be marked with “AF” followed by the air speed, expressed in m/s;
s) symbol for class II construction, for class II reactors only;
t) symbol for class III construction, for class III reactors only.

NOTE 5 Additional markings are allowed provide they do not give rise to misunderstanding.

8.4 Replacement:

Reactors with tapped or multiple windings shall be clearly marked in accordance with 8.1.

8.5 Replacement:

Reactors which are declared to be overload proof reactors and comply with the requirements

for such reactors shall be marked with the symbol for overload proof reactors.

Non-inherently overload proof reactors with incorporated fuses and non overload proof

reactors designed to be protected by fuses shall, in addition, be marked with the rated current

in amperes or milliamperes of the protecting fuse-link, followed or preceded by the symbol for

the time current characteristics of the fuse in accordance with the relevant standard, if

applicable.

Non-inherently overload proof reactors with incorporated replaceable protective devices

other than fuses and non overload proof reactor designed to be protected with protective

devices other than fuses shall, in addition, be marked with the manufacturer’s model or type

reference of the device, and/or ratings of the device.

NOTE Overload proof reactors with non-replaceable devices need no additional marking regarding the protective

device.

The marking shall be sufficient to ensure correct replacement of the protective device.

When replaceable protective devices other than fuses
...

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