IEC 60676:2011

IEC 60676 ®
Edition 3.0 2011-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial electroheating equipment – Test methods for direct arc furnaces

Chauffage électrique industriel – Méthodes d’essai des fours à arc direct

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IEC 60676 ®
Edition 3.0 2011-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial electroheating equipment – Test methods for direct arc furnaces

Chauffage électrique industriel – Méthodes d’essai des fours à arc direct

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX R
ICS 25.180.10 ISBN 978-2-88912-725-2

– 2 – 60676 © IEC:2011
CONTENTS
FOREWORD . 3
1 Scope and object . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Features of the EAF system . 9
4.1 General . 9
4.2 Electrical assembly of EAF . 9
4.3 Furnace construction . 9
4.4 Water cooling . 10
5 Type of tests and general conditions of their performance . 10
5.1 General . 10
5.2 List of tests during cold and hot state . 10
6 Technical tests . 11
6.1 Electrical insulation of high-current system . 11
6.1.1 General . 11
6.1.2 Insulation resistance . 11
6.2 Cooling water system . 11
6.3 Electrode motion speed . 12
6.4 Short-circuit test procedures. 12
6.4.1 General . 12
6.4.2 High current system: resistance and reactance of EAFac . 12
6.4.3 Test procedures . 12
6.4.4 Asymmetry factor. 16
6.5 Main characteristics of EAF during production . 16
6.5.1 General . 16
6.5.2 Test procedures . 16
6.6 Electrode consumption . 17
6.7 Phase rotation . 18
6.8 EAF – Rated capacity . 18
Bibliography . 19

Figure 1 – Wiring diagram for measuring electrical data of the high current system to
determine the resistance and reactance values . 13

60676 © IEC:2011 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL ELECTROHEATING EQUIPMENT –
TEST METHODS FOR DIRECT ARC FURNACES

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
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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 60676 has been prepared by IEC technical committee 27:
Industrial electroheating.
This third edition cancels and replaces the previous edition published in 2002 and constitutes
a technical revision.
Significant technical changes with respect to the previous edition are as follows:
– Clause 1 (Scope and object) – types of furnaces are more clearly defined.
– Clause 2 (Normative references) and Clause 3 (Terms and definitions) have been updated
and completed.
– New Clause 4 (Features of the EAFsystem) has been added; it mainly concentrates on the
tests necessary for high-voltage / high-current electrical equipment in the installation.
– Clause 5 (Type of tests and general conditions of their performance) and Clause 6
(Technical tests) have been modified according to today’s requirements for safe operation
of an EAF.
– 4 – 60676 © IEC:2011
The text of this standard is based on the following documents:
FDIS Report on voting
27/816/FDIS 27/837/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 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.
60676 © IEC:2011 – 5 –
INDUSTRIAL ELECTROHEATING EQUIPMENT –
TEST METHODS FOR DIRECT ARC FURNACES

1 Scope and object
This International Standard specifies test procedures, conditions and methods according to
which the main parameters and the main operational characteristics of electric arc furnaces
(EAF) operated either with alternating current (EAFac) or with direct current (EAFdc) with a
capacity above 500 kg/heat are established.
The EAF technology is also applicable to furnaces, in which liquid metal is kept at high
temperat
...