EN IEC 60779:2020

SLOVENSKI STANDARD
01-oktober-2020
Nadomešča:
SIST EN 60779:2007
Naprave za električno ogrevanje in elektromagnetno obdelavo - Preskusne metode
za peči za pretaljevanje žlindre (IEC 60779:2020)
Installations for electroheating and electromagnetic processing - Test methods for
electroslag remelting furnaces (IEC 60779:2020)
Elektroerwärmungsanlagen und Anlagen für elektromagnetische Bearbeitungsprozesse -
Prüfverfahren für Elektroschlacke-Umschmelzöfen (IEC 60779:2020)
Installations pour traitement électrothermique et électromagnétique - Méthodes d'essai
des fours de refusion sous laitier électroconducteur (IEC 60779:2020)
Ta slovenski standard je istoveten z: EN IEC 60779:2020
ICS:
25.180.10 Električne peči Electric furnaces
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60779

NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2020
ICS 25.180.10 Supersedes EN 60779:2005 and all of its amendments
and corrigenda (if any)
English Version
Installations for electroheating and electromagnetic processing -
Test methods for electroslag remelting furnaces
(IEC 60779:2020)
Installations pour traitement électrothermique et Elektroerwärmungsanlagen und Anlagen für
électromagnétique - Méthodes d'essai des fours de refusion elektromagnetische Bearbeitungsprozesse - Prüfverfahren
sous laitier électroconducteur für Elektroschlacke-Umschmelzöfen
(IEC 60779:2020) (IEC 60779:2020)
This European Standard was approved by CENELEC on 2020-07-21. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60779:2020 E
European foreword
The text of document 27/1128/FDIS, future edition 3 of IEC 60779, prepared by IEC/TC 27 "Industrial
electroheating and electromagnetic processing" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN IEC 60779:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-04-21
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-07-21
document have to be withdrawn
This document supersedes EN 60779:2005 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 60779:2020 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the notes in EN 60398:2015 have to be added for the
standards indicated.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Annex ZA of EN 60398:2015 is applicable except as follows:
Add the following references:
Publication Year Title EN/HD Year
IEC 60398 2015 Installations for electroheating and EN 60398 2015
electromagnetic processing - General
performance test methods
IEC 60519-8 - Safety in installations for electroheating EN IEC 60519-8 -
and electromagnetic processing - Part 8:
Particular requirements for electroslag
remelting furnaces
IEC 60676 2011 Industrial electroheating equipment - Test EN 60676 2012
methods for direct arc furnaces

IEC 60779 ®
Edition 3.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Installations for electroheating and electromagnetic processing – Test methods

for electroslag remelting furnaces

Installations pour traitement électrothermique et électromagnétique – Méthodes

d'essai des fours de refusion sous laitier électroconducteur

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.180.10 ISBN 978-2-8322-8447-6

– 2 – IEC 60779:2020 © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
3.1 General . 7
3.2 Energy efficiency . 8
3.3 State and parts . 8
4 Basic provisions for testing and test conditions . 9
5 Comparing equipment or installations . 9
6 Measurements and workloads . 9
7 Numerical modelling . 9
8 Technical tests . 10
8.100 Measurement of the effective stroke of the electrode ram motion . 10
8.101 Measurement of the speed of the electrode motion . 10
8.102 Measurement of the time interval for exchanging electrodes . 10
8.103 Measurement of the open-circuit secondary voltage of the electroheating
installation . 10
8.104 Measurement of the electrical parameters of the secondary circuit of the
electroheating installation . 10
8.104.1 General . 10
8.104.2 Carrying out a short-circuit test . 11
8.104.3 Measurement of electrical parameters of the secondary circuit under
normal operating conditions . 12
8.104.4 Measurement of currents of the coaxial return conductors . 14
8.105 Measurement of the active power, reactive power and power factor of the
electroheating installation . 14
8.106 Measurement of the melting rate of consumable electrode(s) . 14
8.107 Measurement of vacuum parameters for a vacuum electroslag remelting
furnace . 14
8.107.1 Measurement of the limit vacuum pressure . 14
8.107.2 Measurement of the pumping time . 14
8.107.3 Measurement of pressure rise rate . 14
8.107.4 Measurement of working pressure in the vacuum chamber of a furnace . 15
8.108 Measurement of the pressure in the chamber of a pressurized electroslag
remelting furnace . 15
8.109 Measurement of the gas composition of an electroslag remelting furnace
working under an inert gas atmosphere . 15
9 Efficiency of the installation . 15
Annex A (informative) Energy efficiency assessment . 16
Annex B (informative) Visual display of energy efficiency related information . 17
Annex C (informative) Estimating energy use . 18
Annex D (informative) Energy recoverability . 19
Annex AA (normative) Explanatory diagrams for symbols and definitions relating to the
power circuit of electroslag remelting equipment . 20
AA.1 Power circuit of electroslag remelting equipment (see Figure AA.1 to
Figure AA.3) . 20

IEC 60779:2020 © IEC 2020 – 3 –
Bibliography . 23

Figure AA.1 – Example of a single-phase electroslag remelting furnace circuit . 20
Figure AA.2 – Example of a three-phase electroslag remelting furnace circuit . 21
Figure AA.3 – Example of a coaxial electroslag remelting furnace circuit . 22

– 4 – IEC 60779:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTALLATIONS FOR ELECTROHEATING
AND ELECTROMAGNETIC PROCESSING –
TEST METHODS FOR ELECTROSLAG REMELTING FURNACES

FOREWORD
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