Industrial electroheating equipment - Test methods for direct arc furnaces

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 temperature or superheated to casting temperature (e.g. in a ladle furnace (LF), operated with alternating current). Test methods for some special equipment, e.g. controlled rectifiers for EAFdc, are covered by IEC 60146-1-1. Test methods for submerged arc furnaces (SAF) are covered by IEC 60683.

Industrielle Elektrowärmeanlagen - Prüfverfahren für Lichtbogen-Schmelzöfen

Chauffage électrique industriel - Méthodes d'essai des fours à arc direct

La CEI 60676:2011 spécifie les procédures, les conditions et les méthodes d'essai suivant lesquelles sont établis les principaux paramètres et les principales caractéristiques de fonctionnement des fours à arc électrique (FAE), soit à courant alternatif (FAE c.a.), soit à courant continu (FAE c.c.), dont la capacité est supérieure à 500 kg/charge de fusion. Cette troisième édition annule et remplace la précédente édition parue en 2002 et constitue une révision technique. Les principales modifications techniques par rapport à l'édition précédente sont les suivantes: - Article 1 (Domaine d'application et objet) - les types de fours sont définis de façon plus claire. - L'Article 2 (Références normatives) et l'Article 3 (Termes et définitions) ont été mis à jour et complétés. - Un nouvel Article 4 (Caractéristiques des fours à arc électrique (FAE)) a été ajouté; il se concentre principalement sur les essais nécessaires pour l'appareillage électrique à haute tension/haute intensité de l'installation. - L'Article 5 (Type des essais et conditions générales d'exécution) et l'Article 6 (Essais techniques) ont été modifiés pour s'adapter aux exigences actuelles relatives à la sécurité de fonctionnement d'un four à arc électrique.

Oprema za industrijsko električno ogrevanje - Preskusne metode za peči z odkritim oblokom

Ta mednarodni standard določa preskusne postopke, pogoje in metode, po katerih so vzpostavljeni glavni parametri in glavne značilnosti peči z odkritim električnim oblokom (EAF), ki delujejo z izmeničnim tokom (EAFac) ali enosmernim tokom (EAFdc) z zmogljivostjo nad 500 kg/enoto toplote. Tehnologija EAF se uporablja tudi za peči, v katerih se tekoča kovina vzdržuje na visoki temperaturi ali segreje na temperaturo vlivanja (npr. v ponovčni peči (LF), ki deluje z izmeničnim tokom). Preskusne metode za nekatere vrste posebne opreme, npr. nadzorovane usmernike za EAFdc, so zajete v standardu IEC 60146-1-1. Preskusne metode za peči z zakritim oblokom (SAF) so zajete v standardu IEC 60683.

General Information

Status
Published
Publication Date
22-Mar-2012
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
20-Mar-2012
Due Date
25-May-2012
Completion Date
23-Mar-2012

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SLOVENSKI STANDARD
SIST EN 60676:2012
01-maj-2012
2SUHPD]DLQGXVWULMVNRHOHNWULþQRRJUHYDQMH3UHVNXVQHPHWRGH]DSHþL]
RGNULWLPREORNRP
Industrial electroheating equipment - Test methods for direct arc furnaces
Industrielle Elektrowärmeanlagen - Prüfverfahren für Lichtbogen-Schmelzöfen
Chauffage électrique industriel - Méthodes d'essai des fours à arc direct
Ta slovenski standard je istoveten z: EN 60676:2012
ICS:
25.180.10 (OHNWULþQHSHþL Electric furnaces
SIST EN 60676:2012 en

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

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SIST EN 60676:2012
---------------------- Page: 2 ----------------------
SIST EN 60676:2012
EUROPEAN STANDARD
EN 60676
NORME EUROPÉENNE
February 2012
EUROPÄISCHE NORM
ICS 25.180.10 Supersedes EN 60676:2002
English version
Industrial electroheating equipment -
Test methods for direct arc furnaces
(IEC 60676:2011)
Chauffage électrique industriel - Industrielle Elektrowärmeanlagen -
Méthodes d'essai des fours à arc direct Prüfverfahren für Lichtbogen-Schmelzöfen
(CEI 60676:2011) (IEC 60676:2011)

This European Standard was approved by CENELEC on 2011-12-13. 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, Romania, Slovakia, Slovenia,

Spain, Sweden, Switzerland, Turkey and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60676:2012 E
---------------------- Page: 3 ----------------------
SIST EN 60676:2012
EN 60676:2012 - 2 -
Foreword

The text of document 27/816/FDIS, future edition 3 of IEC 60676, prepared by IEC/TC 27 "Industrial

electroheating" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as

EN 60676:2012.
The following dates are fixed:
(dop) 2012-09-13
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2014-12-13
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60676:2002.

EN 60676:2012 includes the following significant technical changes with respect to EN 60676:2002:

– 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.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent

rights.
Endorsement notice

The text of the International Standard IEC 60676:2011 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

[2] IEC 60146-1-1:2009 NOTE Harmonized as EN 60146-1-1:2010 (not modified).
[3] IEC 60683:2011 NOTE Harmonized as EN 60683:2012 (not modified).
---------------------- Page: 4 ----------------------
SIST EN 60676:2012
- 3 - EN 60676:2012
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year
IEC 60398 1999 Industrial electroheating installations - EN 60398 1999
General test methods
IEC 60519-1 - Safety in electroheating installations - EN 60519-1 -
Part 1: General requirements
IEC 60519-4 - Safety in electroheat installations - EN 60519-4 -
Part 4: Particular requirements for arc furnace
installations
---------------------- Page: 5 ----------------------
SIST EN 60676:2012
---------------------- Page: 6 ----------------------
SIST EN 60676:2012
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
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 60676:2012
– 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

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SIST EN 60676:2012
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

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 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.
---------------------- Page: 9 ----------------------
SIST EN 60676:2012
– 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.
---------------------- Page: 10 ----------------------
SIST EN 60676:2012
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

temperature or superheated to casting temperature (e.g. in a ladle furnace (LF), operated with

alternating current).

Test methods for some special equipment, e.g. controlled rectifiers for EAFdc, are covered by

IEC 60146-1-1.
Test methods for submerged arc furnaces (SAF) are covered by IEC 60683.
2 Normative references

The following referenced documents are indispensable for the application 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.
IEC 60398:1999, Industrial electroheating installations – General test methods

IEC 60519-1, Safety in electroheating installations – Part 1: General requirements

IEC 60519-4, Safety in electroheat installations – Part 4: Particular requirements for arc

furnace installations
3 Terms and definitions

For the purposes of this document the terms and definitions given in IEC 60519-1:2010 and

the following apply.

NOTE Refer to International Electrotechnical Vocabulary, IEC 600500, for general definitions. Terms relating to

industrial electroheat are defined in IEC 60050-841.
3.1
active power

mean value of the instantaneous power p (in kW) taken under periodic conditions over one

period of time T (in h):
P= p dt

NOTE Active power instantaneous value (r.m.s.) measured at any time, including all phases.

[IEC 60050-131:2002, 131-11-42, modified]
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SIST EN 60676:2012
– 6 – 60676 © IEC:2011
3.2
apparent power
power rating of the transformer, energizing the EAF (in MVA)
S= 3 UI (for three-phase EAF)
where
U is the voltage, r.m.s., sinusoidal value [in kV]
I is the current, r.m.s. sinusoidal value [in KA]
[IEC 60050-131:2002, 131-11-41, modified]
3.3
arc furnace

furnace with a vessel, in which a metallic charge is heated mainly by electric arc using

alternating current (EAFac) or direct current (EAFdc)
[IEC 60050-841:2004, 841-26-05, modified]
3.4
arc furnace transformer

transformer changing medium/high voltage electrical supply to low voltage and high current

for an EAF
[IEC 60050-841:2004, 841-26-55, modified]
3.5
asymmetry factor

difference between maximum and minimum impedance of any phase, divided by the mean

impedance of all three phases (in %)
NOTE Not applicable for EAFdc.
3.6
capacity (of EAF)
volume of liquid material, which can be produced in the EAF (in t)
NOTE Whether metric or short tonnes according to pre-requisites.
[IEC 60050-841:2004, 841-21-40, modified]
3.7
cold state (of EAF installation)

thermal state of EAF installation when the temperature of all parts equals the ambient

temperature
3.8
electric arc furnace using alternating current
EAFac

furnace, in which electric arcs between the electrodes and the process material are formed,

using three-phase alternating current
NOTE Ladle furnace (LF) is operated under the same conditions.
[IEC 60050-841:2004, 841-26-07, modified]
---------------------- Page: 12 ----------------------
SIST EN 60676:2012
60676 © IEC:2011 – 7 –
3.9
electric arc furnace using direct current
EAFdc

furnace, in which the direct current is induced via a bottom electrode (anode) to the material

to be processed, forming arcs between the material and the electrode from top (cathode)

[IEC 60050-841:2004, 841-26-06, modified]
3.10
EAF electrode

part produced from high density graphite to transfer the electrical energy forming arcs

between tip and charge material

NOTE In EAFdc, a bottom electrode (anode) is metallic or conductive material in the bottom of an EAF and arcs

are formed between the charge material and the graphite electrode from top (cathode).

[IEC 60050-841:2004, 841-26-38, modified]
3.11
electrode clamp

metallic, water cooled equipment to hold the electrode and supply current for arcing to the

electrode
[IEC 60050-841:2004, 841-26-39, modified]
3.12
heat

mass of liquid material which is tapped after one process from an EAF into a ladle (in t)

3.13
high-current line
assembly to conduct the high current between transformer secondary bushings and
electrode(s) of an EAF

NOTE It consists of the bus bar system, cables and either a current tube system or current conducting electrode

arm to the electrodes.
[IEC 60050-841:2004, 841-26-54, modified]
3.14
hot state (of EAF)

thermal state of an EAF in which the components and charge material are at a temperature

above 600 °C and a steady-state temperature of the components is reached
3.15
medium/high-voltage switchgear

medium/high-voltage switchgear connecting the EAF transformer to the electrical supply by

switching on/off under load
NOTE EAF circuit switchgear capable for up to 150 operations under load per day.
3.16
operational short circuit

short circuit due to direct contact of at least two electrodes in an EAFac with charge/liquid

material
NOTE In EAFdc, short
...

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