Installations for electroheating and electromagnetic processing - Test methods for electroslag remelting furnaces

IEC 60779:2020 specifies the test procedures, conditions and methods for determining the main performance parameters and operational characteristics of electroslag remelting furnaces. Measurements and tests that are solely used for the verification of safety requirements of the installations are outside the scope of this document and are covered by IEC 60519-1 and IEC 60519-8. This third edition cancels and replaces the second edition published in 2005. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - the structure has been redrafted according to IEC 60398:2015; - the scope and object have been redrafted; - the terms/definitions, normative references and bibliography have been updated and completed; - all test methods and content from IEC 60779:2005 that have been included in IEC 60398:2015 have been removed to avoid any duplication.

Elektroerwärmungsanlagen und Anlagen für elektromagnetische Bearbeitungsprozesse - Prüfverfahren für Elektroschlacke-Umschmelzöfen

Installations pour traitement électrothermique et électromagnétique - Méthodes d'essai des fours de refusion sous laitier électroconducteur

L'IEC 60779:2020 spécifie les procédures, conditions et méthodes d'essai permettant de déterminer les paramètres de performance principaux et les caractéristiques de fonctionnement principales des fours de refusion sous laitier électroconducteur. Les mesurages et les essais qui sont utilisés aux seules fins de la vérification des exigences de sécurité des installations ne relèvent pas du domaine d'application du présent document et sont couverts par l'IEC 60519-1 et l'IEC 60519-8. Cette troisième édition annule et remplace la deuxième édition parue en 2005. Elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - la structure a été remaniée sur la base de l'IEC 60398:2015; - le domaine d'application et l'objet ont été reformulés; - les termes et définitions, les références normatives et la bibliographie ont été mis à jour et complétés; - l'ensemble des méthodes d'essai et du contenu de l'IEC 60779:2005 qui ont été inclus dans l'IEC 60398:2015 ont été retirés afin d'éviter toute répétition.

Naprave za električno ogrevanje in elektromagnetno obdelavo - Preskusne metode za peči za pretaljevanje žlindre (IEC 60779:2020)

General Information

Status
Published
Current Stage
6060 - Document made available
Due Date
07-Aug-2020
Completion Date
07-Aug-2020

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SLOVENSKI STANDARD
SIST EN IEC 60779:2020
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
SIST EN IEC 60779:2020 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60779:2020
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SIST EN IEC 60779:2020
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
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SIST EN IEC 60779:2020
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.
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SIST EN IEC 60779:2020
EN IEC 60779:2020 (E)
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
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SIST EN IEC 60779:2020
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SIST EN IEC 60779:2020
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

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 60779:2020
– 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

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SIST EN IEC 60779:2020
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

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SIST EN IEC 60779:2020
– 4 – IEC 60779:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTALLATIONS FOR ELECTROHEATING
AND ELECTROMAGNETIC PROCESSING –
TEST METHODS FOR ELECTROSLAG REMELTING 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 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 60779 has been prepared by IEC technical committee 27: Industrial

electroheating and electromagnetic processing.

This third edition cancels and replaces the second edition published in 2005. It constitutes a

technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
– the structure has been redrafted according to IEC 60398:2015;
– the scope and object have been redrafted;

– the terms/definitions, normative references and bibliography have been updated and

completed;
– all test methods and content from IEC 60779:2005 that have been included in
IEC 60398:2015 have been removed to avoid any duplication.
---------------------- Page: 10 ----------------------
SIST EN IEC 60779:2020
IEC 60779:2020 © IEC 2020 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
27/1128/FDIS 27/1130/RVD

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

This standard is to be read in conjunction with IEC 60398:2015. It supplements or modifies the

corresponding clauses of IEC 60398:2015. Where the text indicates a “modification” of,

"addition" to or a "replacement" of the relevant provision of IEC 60398:2015, these changes are

made to the relevant text of IEC 60398:2015. Where no change is necessary, the words "This

clause of IEC 60398:2015 is applicable" are used. When a particular subclause of

IEC 60398:2015 is not mentioned in this standard, that subclause applies as far as is

reasonable. When a particular subclause of IEC 60398:2015 is not applicable, the word “Void”

is used.

Additional specific provisions to those in IEC 60398:2015, given as individual clauses or

subclauses, are numbered starting from 101.
NOTE The following numbering system is used:

– subclauses, tables and figures that are numbered starting from 101 are additional to those in IEC 60398:2015;

– unless notes are in a new subclause or involve notes in IEC 60398:2015, they are numbered starting from 101,

including those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.

The committee has decided that the contents of this document will remain unchanged until the

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

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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SIST EN IEC 60779:2020
– 6 – IEC 60779:2020 © IEC 2020
INSTALLATIONS FOR ELECTROHEATING
AND ELECTROMAGNETIC PROCESSING –
TEST METHODS FOR ELECTROSLAG REMELTING FURNACES
1 Scope
Clause 1 of IEC 60398:2015 is replaced by the following.
Replacement:

This International Standard specifies the test procedures, conditions and methods for

determining the main performance parameters and operational characteristics of electroslag

remelting furnaces.

Measurements and tests that are solely used for the verification of safety requirements of the

installations are outside the scope of this document and are covered by IEC 60519-1 and

IEC 60519-8.

This document applies to industrial electroslag remelting furnaces, the rated capacity of which

is equal to, or greater than, 50 kg.

This document is applicable to industrial electroslag remelting furnaces having one or more

electrodes and having different melting power supplies, such as alternating current, direct

current, or low-frequency current.

This document includes the concept and material on energy efficiency dealing with the electrical

and processing parts of the installations, as well as the overall performance.
2 Normative references
Clause 2 of IEC 60398:2015 is applicable except as follows.
Replacement:

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.
Modification:
Delete the footnotes.
Additions:

IEC 60398:2015, Installations for electroheating and electromagnetic processing – General

performance test methods

IEC 60519-8, Safety in installations for electroheating and electromagnetic processing – Part 8:

Particular requirements for electroslag remelting furnaces

IEC 60676:2011, Industrial electroheating equipment – Test methods for direct arc furnaces

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SIST EN IEC 60779:2020
IEC 60779:2020 © IEC 2020 – 7 –
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60398:2015 as well

as the following apply.
3.1 General
Additions:
3.1.101
electroheating installation with an electroslag remelting furnace

complete assembly of electroheating equipment and electrical and mechanical accessories

necessary for operation and utilization of an electroslag remelting furnace
3.1.102
power of an electroheating installation

apparent power S (in kVA) or active power P (in kW) measured at the input of the supply line

3.1.103
power factor of an electroheating installation
cosφ

ratio of the active power to the apparent power measured at the input of the supply line

3.1.104
on-load voltage of an electroslag remelting furnace

voltage measured between two points, which, depending on the type of a furnace, are either

the base plate, the electrode clamping device(s) bringing the melting electrical current to the

consumable electrod
...

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