Safety of transformers, reactors, power supply units and combinations thereof - Part 2-3: Particular requirements and tests for ignition transformers for gas and oil burners

IEC 61558-2-3:2010 deals with the safety of ignition transformers for gas and oil burners. Ignition transformers incorporating electronic circuits are also covered by this standard. This second edition cancels and replaces the first edition published in 1999. 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 2-3: Règles particulières et essais pour les transformateurs d'allumage pour brûleurs à gaz et combustibles liquides

La CEI 61558-2-3:2010 traite de la sécurité des transformateurs d'allumage pour brûleurs à gaz et combustibles liquides. Les transformateurs d'allumage incorporant des circuits électroniques sont également couverts par la présente norme. Cette deuxième édition annule et remplace la première édition publiée en 1999. Elle constitue une révision technique. Les principales modifications comprennent 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. 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.

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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 61558-2-3
Edition 2.0 2010-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUB LICATION GROUPÉE DE SÉCURITÉ
Safety of transformers, reactors, power supply units and combinations thereof –

Part 2-3: Particular requirements and tests for ignition transformers for gas and

oil burners
Sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et des
combinaisons de ces éléments –
Partie 2-3: Règles particulières et essais pour les transformateurs d’allumage
pour brûleurs à gaz et combustibles liquides
IEC 61558-2-3:2010
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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---------------------- Page: 2 ----------------------
IEC 61558-2-3
Edition 2.0 2010-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUB LICATION GROUPÉE DE SÉCURITÉ
Safety of transformers, reactors, power supply units and combinations thereof –

Part 2-3: Particular requirements and tests for ignition transformers for gas and

oil burners
Sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et des
combinaisons de ces éléments –
Partie 2-3: Règles particulières et essais pour les transformateurs d’allumage
pour brûleurs à gaz et combustibles liquides
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.180 ISBN 978-2-88912-034-5
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 61558-2-3 © IEC:2010
CONTENTS

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

1 Scope...............................................................................................................................6

2 Normative references .......................................................................................................7

3 Terms and definitions .......................................................................................................7

4 General requirements .......................................................................................................7

5 General notes on tests .....................................................................................................7

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

7 Classification....................................................................................................................8

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

9 Protection against electric shock ....................................................................................10

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

11 Output voltage and output current under load .................................................................10

12 No-load output voltage ...................................................................................................11

13 Short-circuit voltage .......................................................................................................11

14 Heating ..........................................................................................................................11

15 Short-circuit and overload protection ..............................................................................11

16 Mechanical strength .......................................................................................................12

17 Protection against harmful ingress of dust, solid objects and moisture............................12

18 Insulation resistance, dielectric strength and leakage current .........................................13

19 Construction ...................................................................................................................13

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

21 Internal wiring.................................................................................................................14

22 Supply connection and other external flexible cable or cords ..........................................14

23 Terminals for external conductors...................................................................................14

24 Provisions for protective earthing ...................................................................................14

25 Screws and connections .................................................................................................14

26 Creepage distances, clearances and distances through insulation..................................14

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

28 Resistance to rusting......................................................................................................15

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

Annex C Creepage distances (cr), clearances (cl) and distances through insulation

(dti) – Material group II (400 ≤CTI <600) ..............................................................................17

Annex D Creepage distances (cr), clearances (cl) and distances through insulation

(dti) – Material group I (CTI ≥600)........................................................................................17

Figure 101 – Arcing horn ......................................................................................................16

Table 101 – Preferred values of operational parameters .......................................................11

Table 102 – Test time for short-circuit test ............................................................................12

Table 103 – Creepage distances and clearances for output terminals ...................................15

---------------------- Page: 4 ----------------------
61558-2-3 © IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF TRANSFORMERS, REACTORS,
POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
Part 2-3: Particular requirements and tests for ignition
transformers for gas and oil burners
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 61558-2-3 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 1999. 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 – 61558-2-3 © IEC:2010
The text of this standard is based on the following documents:
FDIS Report on voting
96/357/FDIS 96/364/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 ignition for gas

and oil burners.

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 adopted accordingly.
In this part, the following print types are used:
– requirements proper: in roman type;
– test specifications: in italic type;
explanatory matters: 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.
---------------------- Page: 6 ----------------------
61558-2-3 © IEC:2010 – 5 –

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: 7 ----------------------
– 6 – 61558-2-3 © IEC:2010
SAFETY OF TRANSFORMERS, REACTORS,
POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
Part 2-3: Particular requirements and tests for ignition
transformers for gas and oil burners
1 Scope
Replacement:

This part of IEC 61558 deals with the safety of ignition transformers for gas and oil burners.

Ignition transformers incorporating electronic circuits are also covered by this standard.

NOTE 1 Safety includes electrical, thermal, mechanical and chemical aspects.

Unless otherwise specified, from here onward, the term transformer covers ignition

transformers for gas and oil burners.

This part applies to fixed single-phase air-cooled (natural or forced) associated dry-type

transformers used in the ignition systems of gas and oil burners. The windings may be

encapsulated or non-encapsulated.

The rated supply voltage does not exceed 1 000 V a.c., and the rated supply frequency

and the internal operational frequency do not exceed 500 Hz.
The rated short-circuit output current does not exceed 500 mA a.c.

The no-load output voltage or the rated output voltage does not exceed 15 000 V a.c.

This part is not applicable to external circuits and their components intended to be connected

to the input and output terminals or socket-outlets of the transformers.

Transformers covered by this part are used in applications where double or reinforced

insulation between circuits is not required by the installation rules or by the end product

standard.
NOTE 2 Attention is drawn to the following:

- for transformers 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 transformers should also be

considered;

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

transformers intended for use in special environments.

NOTE 3 Future technological development of transformers may necessitate a need to increase the upper limit of

the frequencies, until then this part may be used as a guidance document.
---------------------- Page: 8 ----------------------
61558-2-3 © IEC:2010 – 7 –
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

ISO 3864-1:2002, Graphical symbols – Safety colours and safety signs – Part 1: Design

principles for safety sign in workplaces and public areas – Part 1:Design principles for safety

signs in workplaces and public areas
3 Terms and definitions
This clause of Part 1 is applicable, except as follows:
Addition:
3.1.101
ignition transformer

fixed single-phase air-cooled associated transformer within an ignition system generating

an arc between two electrodes connected to the high voltage output of the transformer. This

transformer is intended to be used with a control unit built-in in the ignition system

3.1.102
rated duty factor

time interval during which the transformer operates, expressed as a percentage of the

duration of the entire cycle
3.5.101
rated short-circuit output current

output current at the rated supply voltage and the rated frequency when the output

winding is short-circuited, assigned to the transformer by the manufacturer
3.5.102
rated no-load output voltage

output voltage when the transformer is connected to the rated supply voltage at the rated

supply frequency under no-load conditions, assigned to the transformer by the
manufacturer
Replacement:
3.5.4 not applicable.
3.5.5 not applicable.
4 General requirements
This clause of Part 1 is applicable.
5 General notes on tests
This clause of Part 1 is applicable.
---------------------- Page: 9 ----------------------
– 8 – 61558-2-3 © IEC:2010
6 Ratings
This clause of Part 1 is applicable, except as follows:
Addition:
6.101 The rated no-load output voltage shall not exceed 15 000 V a.c.
6.102 Void.
6.103 The rated frequency shall not exceed 500 Hz.
6.104 The rated supply voltage shall not exceed 1 000 V a.c.
6.105 The rated short-circuit output current shall not exceed 500 mA a.c.

6.106 Preferred values of the rated no-load output voltage, the rated short-circuit output

current, and the rated duty factor are given in Table 101.

Compliance with the requirements of 6.101 to 6.106 is checked by inspection of the marking.

7 Classification
This clause of Part 1 is applicable, except as follows:
7.1 Replacement:
According to their protection against electric shock:
– class I transformers, for specific use only.

NOTE Incorporated transformers are not classified. Their class of protection against electric shock is

determined by the way the transformer is incorporated.
7.2 Replacement:
According to short-circuit protection or protection against abnormal conditions:
– inherently short-circuit proof transformers;
– fail-safe transformers.
7.4 Replacement:
According to their mobility:
– fixed ignition transformers for gas and oil burners.
7.5 Replacement:
According to their duty type:
– continuous duty;
– intermittent duty cycle.
7.6
---------------------- Page: 10 ----------------------
61558-2-3 © IEC:2010 – 9 –
This clause of Part 1 is applicable, except as follows
7.6.2 not applicable.
8 Marking and other information
This clause of Part 1 is applicable, except as follows:
8.1 Items b), c), d), and f) are not applicable.
8.1 h) Replacement:
Transformers shall be marked with one of the graphical symbols shown in 8.11;
8.1 q) Replacement:

Transformers for intermittent duty cycle shall be marked with the rated duty factor

expressed as a percentage and the duration of the entire cycle expressed in minutes.

NOTE Preferred value for the entire cycle of intermittent duty is 3 min.
Addition:

8.1.101 Transformers shall be marked with the graphical symbol according to 8.11 with the

colour in accordance with ISO 3864-1.
For incorporated transformers, the above graphical symbol may be either on the

transformer or on the equipment placed close to the transformer. If the graphical symbol is

not on the transformer, the manufacturer shall state in the instruction sheets that this

graphical symbol shall be placed on the equipment close to the transformer.

8.1.102 Transformers shall be marked with the rated short-circuit output current in

milliamperes and with the rated no load output voltage in kV.
8.11 Addition:
Symbol or Explanation or title Identification
graphical symbol
Inherently short-circuit proof ignition transformer
with one end of the output winding for connection to
the protective earth
Inherently short-circuit proof ignition transformer
with the midpoint of the output winding for
connection to the protective earth
Fail-safe ignition transformer with one end of the
output winding for connection to the protective earth
Fail-safe ignition transformer with the midpoint of
the output winding for connection to the protective
earth
---------------------- Page: 11 ----------------------
– 10 – 61558-2-3 © IEC:2010
8.14 Addition:

Ultimate safety of transformers is dependent upon the control unit and this shall be stated in

the instruction sheet.
9 Protection against electric shock
This clause of Part 1 is applicable.
10 Change of input voltage setting
This clause of Part 1 is applicable.
11 Output voltage and output current under load
Replacement:
11 Output voltage and output current

11.1 The output current shall not differ from the rated short-circuit output current by more

than 10 %.
Compliance is checked by the following test:

The output terminals of the transformer are short-circuited by means of a suitable ammeter.

The transformer is connected to the rated supply voltage at the rated frequency and

operated at the rated duty factor until steady-state conditions are reached. The output

current is then measured.

With the supply voltage reduced to 85 %, the minimum output current value shall not be less

than 70 % of the rated short-circuit output current.

11.2 The no-load output voltage shall not differ from the rated no-load output voltage by

more than 10 %.
Compliance is checked by the following test:

The transformer is connected to the rated supply voltage at the rated frequency. The

r.m.s. value of the no-load output voltage is measured. During this test, the protective

earthing terminal shall be connected to the protective earth.

NOTE The test equipment should be selected such that no voltage rise occurs due to the capacitance (i.e.,

increase in the capacitance) in the test equipment or measurement network.
---------------------- Page: 12 ----------------------
61558-2-3 © IEC:2010 – 11 –
Table 101 – Preferred values of operational parameters
Type of connection of the M M E E M M M E E M M M
output winding to the
protective earth
Rated duty factor 100 100 100 100 33 33 33 33 33 20 20 20
Rated no-load output 14 10 7 5 14 10 10 7 5 10 10 10
voltage
Rated short-circuit output 20 20 20 20 30 20 16 20 20 23 20 16
current
M = midpoint of the output winding for connection to protective earth
E = one end of the output winding for connection to protective earth
12 No-load output voltage
This clause of Part 1 is not applicable.
13 Short-circuit voltage
This clause of Part 1 is not applicable.
14 Heating
This clause of Part 1 is applicable, except as follows:
14.1 Addition after the second paragraph:

For intermittent duty cycle, the test is carried out at the rated duty factor. Temperatures

are measured in the middle of the interval during which the transformer operates.

Replacement of the tenth paragraph starting with "Transformers are supplied at...", by the

following:
Transformers are connected to 1,06 times the rated supply voltage, at the rated

frequency, and the output winding of the transformer or output terminals are short-

circuited.
15 Short-circuit and overload protection
This clause of Part 1 is applicable except as follows:
15.1 Replacement of the second paragraph:

Compliance is checked by inspection and by the following test, which is performed with the

transformer at ambient temperature, with the same position of the transformer as in the test

of 14.1. The test is carried out at 1,06 times the rated supply voltage, or, for non inherently

short-circuit proof transformers, at any value of the supply voltage between 0,9 times and

1,1 times the rated supply voltage:
---------------------- Page: 13 ----------------------
– 12 – 61558-2-3 © IEC:2010

NOTE The overload is only applied to the transformer during the first adjustment of the burner when the

transformer is at ambient temperature.
Addition:
– additionally by the tests of 15.1.101.

15.1.101 Transformer is connected to an arcing horn as shown in Figure 101 and supplied

at 1,06 times the rated supply voltage at the rated frequency, taking into consideration the

rated duty factor. During the test the arcing horn shall be in a vertical position and in a

draught-free location.

The arcing horn shall be so designed that the rising spark reaches repetitive extinction.

Distance A and angle α shall be adjusted accordingly. The test is carried out for a period of

50 days.

NOTE For transformers having a rated no-load output voltage less than 10 kV, the angle of horn may be

adjusted for the test in order to reach extinction of the spark.

The length of the high voltage leads shall be less than 300 mm. The leads shall not have

metal sheaths and shall have a copper cross-sectional area of at least 1 mm². The average

distance between these leads should be approximately 40 mm.
During the test, the insulation of the transformer shall not fail.
After this test, the transformer shall withstand the tests acco
...

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