SIST EN 61308:2006

SLOVENSKI STANDARD
SIST EN 61308:2006
01-september-2006
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High-frequency dielectric heating installations - Test methods for the determination of
power output
Hochfrequente dielektrische Erwärmungsanlagen - Prüfverfahren für die Bestimmung der
Ausgangsleistung
Installations de chauffage diélectrique haute fréquence - Méthodes d'essai pour la
détermination de la puissance de sortie
Ta slovenski standard je istoveten z: EN 61308:2006
ICS:
25.180.10
SIST EN 61308:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
EN 61308

NORME EUROPÉENNE
April 2006
EUROPÄISCHE NORM

ICS 25.180.10 Supersedes EN 61308:1996


English version


High-frequency dielectric heating installations -
Test methods for the determination of power output
(IEC 61308:2005 )


Installations de chauffage diélectrique Hochfrequente dielektrische
haute fréquence - Erwärmungsanlagen -
Méthodes d'essai pour la détermination Prüfverfahren für die Bestimmung
de la puissance de sortie der Ausgangsleistung
(CEI 61308:2005 ) (IEC 61308:2005 )




This European Standard was approved by CENELEC on 2005-12-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61308:2006 E

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EN 61308:2006 - 2 -
Foreword
The text of document 27/495/FDIS, future edition 2 of IEC 61308, prepared by IEC TC 27, Industrial
electroheating equipment, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 61308 on 2005-12-01.
This European Standard supersedes EN 61308:1996.
Significant changes with respect to EN 61308:1996 are as follows:
– the equipment under test has been classified into two types: A and B, according to their design;
– test methods have been supplemented by the wet-sand load method and the description of the lamp
load by an example;
– evaluation of the output power for dielectric plastic welders has been added;
– definitions have been brought into line with IEC 60050-841:2004.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2006-11-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2008-12-01
with the EN have to be withdrawn
This European Standard makes reference to International Standards. Where the International Standard
referred to has been endorsed as a European Standard or a home-grown European Standard exists, this
European Standard shall be applied instead. Pertinent information can be found on the CENELEC web
site.
__________
Endorsement notice
The text of the International Standard IEC 61308:2005 was approved by CENELEC as a European
Standard without any modification.
__________

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NORME CEI
INTERNATIONALE
IEC



61308
INTERNATIONAL


Deuxième édition
STANDARD

Second edition

2005-12


Installations de chauffage diélectrique
haute fréquence –
Méthodes d'essai pour la détermination
de la puissance de sortie

High-frequency dielectric heating
installations –
Test methods for the determination
of power output

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microfilms, sans l'accord écrit de l'éditeur. the publisher.
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Pour prix, voir catalogue en vigueur
For price, see current catalogue

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61308  IEC:2005 – 3 –
CONTENTS
FOREWORD.5

1 Scope and object.9
2 Normative references .11
3 Terms and definitions.11
4 Test loads .13
4.1 General .13
4.2 Calorimeter load.13
4.3 Lamp load .13
4.4 Matched resistive load.13
4.5 Wet-sand load .13
5 Description of tests.13
5.1 General .13
5.2 Calorimeter-load method .15
5.3 Lamp-load temperature method.19
5.4 Matched resistive load method .23
5.5 Wet-sand load method.23
5.6 Evaluation of the output power for high-frequency dielectric plastic welders .25
5.7 Evaluation of the output power for type B equipment .27

Annex A (informative) Recommended test circuit for the lamp-load method .29

Figure 1 – Example of a calorimeter load .17
Figure 2 – Example of a short tubular calorimeter load .19
Figure 3 – Lamp-load circuit .19
Figure 4 – Example of a lamp load.21
Figure 5 – Detail of the lamp load .23
Figure 6 – Plastic welding test electrode.27
Figure A.1 – Recommended test circuit for the lamp-load method .29

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61308  IEC:2005 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

HIGH-FREQUENCY DIELECTRIC HEATING INSTALLATIONS –
TEST METHODS FOR THE DETERMINATION
OF POWER OUTPUT


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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment
declared to be in conformity with an IEC Publication.
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 61308 has been prepared by IEC technical committee 27: Industrial
electroheating equipment.
This second edition cancels and replaces the first edition published in 1994 and constitutes a
technical revision. Significant changes with respect to the previous edition are as follows:
− the equipment under test has been classified into two types: A and B, according to their
design;
− test methods have been supplemented by the wet-sand load method and the description of
the lamp load by an example;
− evaluation of the output power for dielectric plastic welders has been added;
− definitions have been brought into line with the second edition of IEC 60050-841:2004.

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61308  IEC:2005 – 7 –
The text of this standard is based on the following documents:
FDIS Report on voting
27/495/FDIS 27/508/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.
The committee has decided that the contents of this publication will remain unchanged until the
maintenance result 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.

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61308  IEC:2005 – 9 –
HIGH-FREQUENCY DIELECTRIC HEATING INSTALLATIONS –
TEST METHODS FOR THE DETERMINATION
OF POWER OUTPUT



1 Scope and object
This International Standard is applicable to industrial high-frequency dielectric heating
installations used for the purpose of thermal applications such as melting, drying, welding,
insect extermination, and gluing of partially conductive or non-conductive materials such as
plastics, wood, rubber, textiles, glass, ceramic, paper, bamboo or foodstuffs, in both normal and
protective atmospheres, using, for example, inert gases or vacuum.
This standard relates to high-frequency dielectric heating installations with nominal dielectric
heating frequency in the range from 1 MHz to 300 MHz with rated useful output power greater
than 50 W.
The main purpose of this standard is to assist in compliance with the requirements set out in 6.4
of IEC 60519-9 when testing electroheating power sources. It is not primarily intended as a
means of representing a potential high-frequency heating application for the requirement of the
user. Due to the large variety of dielectric heating applications, any output power value obtained
as a result of these tests should not always be taken as representing the power that can be
dissipated in a particular dielectric heating installation, but, in certain instances, the output
power value could be used as an indication of performance.
The power required to heat a charge is dependent, for example, on the type of material heated,
the temperature of heating and ambient moisture and on the construction of the electrode
system.
NOTE Heating a charge with dielectric parameters deeply changing in time and/or temperature the value of the
output power obtained with the actual charge may be different from that obtained in standard test conditions.
For equipment working outside the ITU-designated bands, the frequency of the generator follows the resonant
frequency of the output circuit, thus the output power can remain fairly stable during the work cycle, even with hand
tuning of the output circuit. Therefore, according to this standard, the test well represents the actual output power in
practical work conditions.
For equipment working in ITU-designated bands, the frequency of the generator remains stable, but the resonant
frequency of the output circuit varies with the change of dielectric parameters of the load. Therefore, the value of the
mean output power in the work cycle can be much lower than the value obtained in the test conditions. This value
depends on the time response of the eventual automatic tuning system.
This standard relates to equipment normally operating under continuous rated conditions.

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61308  IEC:2005 – 11 –
2 Normativ
...