SIST EN 62076:2007

SLOVENSKI SIST EN 62076:2007

STANDARD
februar 2007
Industrijske inštalacije za električno gretje - Preskusne metode za indukcijske
kanale in indukcijske žarilne peči (IEC 62076:2006)
Industrial electroheating installations - Test methods for induction channel and
induction crucible furnaces (IEC 62076:2006)
ICS 25.180.10 Referenčna številka
SIST EN 62076:2007(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD
EN 62076

NORME EUROPÉENNE
November 2006
EUROPÄISCHE NORM

ICS 25.180.10 Supersedes HD 610 S1:1992 and EN 60646:1998


English version


Industrial electroheating installations -
Test methods for induction channel
and induction crucible furnaces
(IEC 62076:2006)


Installations électrothermiques Industrielle Elektrowärmeanlagen -
industrielles - Prüfverfahren für Induktionsrinnen- und
Méthodes d'essai Induktionstiegelöfen
pour fours à induction à canal et (IEC 62076:2006)
pour fours à induction à creuset
(CEI 62076:2006)




This European Standard was approved by CENELEC on 2006-10-01. 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 62076:2006 E

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EN 62076:2006 - 2 -
Foreword
The text of document 27/523/FDIS, future edition 1 of IEC 62076, prepared by IEC TC 27, Industrial
electroheating equipment, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 62076 on 2006-10-01.
This European Standard supersedes HD 610 S1:1992 and EN 60646:1998.
The significant changes with respect to HD 610 S1:1992 and EN 60646:1998 are as follows:
− EN 60519-1:2003 has been taken into account;
− definitions have been brought into line with the second edition of IEC 60050-841;
− one additional test (5.8 Determination of the rated useful charge G ) has been introduced;
nu
− informative Annex B with the list of symbols used in the standard has been added.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-10-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62076:2006 was approved by CENELEC as a European
Standard without any modification.
__________

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- 3 - EN 62076:2006

Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

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.

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

1)
IEC 60050-151 - International Electrotechnical Vocabulary - -
(IEV)
Part 151: Electrical and magnetic devices


IEC 60050-841 2004 International electrotechnical vocabulary - -
Part 841: Industrial electroheat


IEC 60398 1999 Industrial electroheating installations - - -
General test methods


1) 2)
IEC 60519-1 - Safety in electroheat installations EN 60519-1 2003
Part 1: General requirements


1) 2)
IEC 60519-3 - Safety in electroheat installations EN 60519-3 2005
Part 3: Particular requirements for induction
and conduction heating and induction melting
installations




1)
Undated reference.
2)
Valid edition at date of issue.

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NORME CEI
INTERNATIONALE
IEC



62076
INTERNATIONAL


Première édition
STANDARD

First edition

2006-07


Installations électrothermiques industrielles –
Méthodes d'essai pour fours à induction
à canal et pour fours à induction à creuset

Industrial electroheating installations –
Test methods for induction channel
and induction crucible furnaces

 IEC 2006 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
CODE PRIX
Q
PRICE CODE
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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62076  IEC:2006 – 3 –
CONTENTS
FOREWORD.5

1 Scope and object.9
2 Normative references .9
3 Terms and definitions .9
4 Type of tests and general conditions of tests .21
4.1 General conditions for performance of tests .21
4.2 List of tests .21
4.3 Conditions for performing the tests .21
5 Methods for tests and measurements .23
5.1 Electrical withstand test of the inductor assembly.23
5.2 Tightness test of cooling water circuits .25
5.3 Flow test of cooling water circuits.25
5.4 Measurement of temperature rise of the coolant .25
5.5 Determination of the input power P and power factor λ of the furnace power
circuit .25
5.6 Determination of holding power P .27
h
5.7 Determination of specific energy consumption e, melting rate or super-
heating rate g .27
5.8 Determination of the rated useful charge G .29
nu
5.9 Measurement of the temperature of the furnace casing .29

Annex A (normative) Explanatory diagrams for symbols and definitions relating to the
furnace power circuit.31
Annex B (informative) List of symbols used in the document.35

Figure A.1 – Furnace power circuit .31
Figure A.2 – Examples of compensated circuits .33

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62076  IEC:2006 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INDUSTRIAL ELECTROHEATING INSTALLATIONS –
TEST METHODS FOR INDUCTION CHANNEL AND
INDUCTION CRUCIBLE 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 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 62076 has been prepared by IEC technical committee 27:
Industrial electroheating equipment.
IEC 62076 cancels and replaces the second edition of IEC 60396 (1991) and the second
edition of IEC 60646 (1992) and constitutes a combined technical revision thereof.
The significant changes with respect to these standards are as follows:
− the latest edition of IEC 60519-1 (2003) has been taken into account;
− definitions have been brought into line with the second edition of IEC 60050-841;
− one additional test (5.8 Determination of the rated useful charge G ) has been
nu
introduced;
− informative Annex B with the list of symbols used in the standard has been added.

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62076  IEC:2006 – 7 –
The text of this standard is based on the following documents:
FDIS Report on voting
27/523/FDIS 27/539/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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62076  IEC:2006 – 9 –
INDUSTRIAL ELECTROHEATING INSTALLATIONS –
TEST METHODS FOR INDUCTION CHANNEL AND
INDUCTION CRUCIBLE FURNACES



1 Scope and object
This International Standard applies to electrical installations comprising industrial induction
channel furnaces and induction crucible furnaces for melting, holding and superheating.
Its object is the standardization of test methods to determine the essential parameters and
technical characteristics of electroheat installations comprising furnaces of the type indicated
above.
With the exception of the safety tests given in items a), b) and c) of 4.2.1, the list of tests
given in this standard is neither mandatory nor restrictive. Tests may be selected from this list
as required for the characterization and evaluation of a furnace. Additional tests may be
carried out, preferably in agreement between the manufacturer and the user of the furnaces
concerned.
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 60050-151, International Electrotechnical Vocabulary (IEV) – Part 151: Electrical and
magnetic devices
IEC 60050-841:2004, International Electrotechnical Vocabulary (IEV) – Part 841: Industrial
electroheat
IEC 60398:1999, Industrial electroheating installations – General test methods
IEC 60519-1, Safety in electroheat installations – Part 1: General requirements
IEC 60519-3, Safety in electroheat installations – Part 3: Particular requirements for induction
and conduction heating and induction melting installations
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-151,
IEC 60050-841 (some of which are repeated below), IEC 60519-1 and IEC 60519-3, as well
as the following, apply.
NOTE For definitions of terms from 3.12 to 3.24, see also the explanatory diagrams in Annex A. The symbols are
also listed in Annex B.

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62076  IEC:2006 – 11 –
3.1
electroheat installation with an induction channel furnace or induction crucible furnace
installation comprising induction channel furnace(s) or induction crucible furnace(s) and the
electrical and mechanical equipment necessary for the operation and utilization of the
furnace(s)
NOTE The electrical equipment comprises the auxiliary circuits, the control system and all electrical components
including conductors and switchgear in the furnace power circuit situated after the supply disconnecting device.
3.2
induction crucible furnace
induction melting, holding or superheating furnace, in which the heat is generated directly in
the charge, or in the crucible containing it, by means of one or more inductor coils arranged
around the crucible
[IEV 841-27-32, modified]
3.3
crucible
container for the charge to be melted, made of refractory or electrical conducting materials,
e.g. steel, copper or graphite
[IEV 841-22-50]
3.4
crucible furnace inductor
basic element of the induction crucible furnace, consisting of inductor coil(s) coaxially
enclosing a crucible and usually of magnetic yokes or screens supported by a surrounding
framework or metal casing
[IEV 841-27-59, modified]
3.5
crucible inductor coil
coil of induction melting equipment, carrying an alternating current and designed to create the
magnetic field which induces currents in the charge or in a crucible of conductive material
3.6
induction channel furnace
induction melting, holding or superheating furnace consisting of one or more refractory lined
chambers into which the charge to be heated or melted is placed and to which one or more
channel inductors are attached
[IEV 841-27-30, modified]
3.7
channel inductor
channel furnace inductor
replaceable or fixed element of an induction channel furnace consisting of a core type
inductor attached to the furnace chamber, comprising the channel inductor coils, the magnetic
core, the shields, the casing and the channel made of refractory material
[IEV 841-27-57, modified]

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62076  IEC:2006 – 13 –
3.8
channel inductor coil
electrical winding on a closed magnetic core to be connected to an a.c. supply for generating
an alternating magnetic flux in the core
3.9
core type inductor
heating inductor with a closed magnetic core passing through its channel inductor coil and the
charge to be heated (transformer principle)
[IEV 841-27-58, modified]
3.10
closed magnetic core
closed laminated iron core, creating a low reluctance path for the magnetic flux
3.11
cooling and protection shield for the channel inductor
air or water cooled shield, placed between the refractory lining and the channel inductor coil
of the induction channel furnace
NOTE The cooling and protection shield also serves as a screen for the channel inductor coil in case of any leak of
liquid metal.
[IEV 841-27-60, modified]
3.12
furnace power circuit
circuit consisting of the power source and compensated circuit of the furnace, including the
conductors connecting both
3.13
power source
equipment for the supply of power to the compensated circuit of furnace and having the
following main specified characteristics:
• frequency f or frequency band f f
2 21…. 22
• voltage U (r.m.s. value)
2
• current I (r.m.s. value)
2
• active power P
2
3.14
compensated circuit of the furnace
electric circuit comprising the inductor, a compensating capacitor bank and a load-matching
transformer (if applies)
NOTE See Annex A.
3.15
input power of the furnace power circuit
(apparent power S or active power P)
electric power at the supply line to the furnace power circuit

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62076  IEC:2006 – 15 –
3.16
power factor of the furnace power circuit
λ
ratio of the active power P to the apparent power S
NOTE Under sinusoidal conditions, the power factor is cos φ (active factor).
1
[IEV 131-11-46, modified]
3.17
rated electrical values of the installation or a part thereof
rated electrical values of the installation or a part of it are those, for which it is designed and
marked on the rating plate, for example:
• frequency f or frequency band f . f
n n1 n2
• voltage U
n
• current I
n
• active power P
n
3.18
input voltage of the compensated circuit
U
c
voltage across the input terminals of the compensated circuit
3.19
input current of the compensated circuit
I
c
current absorbed by the compensated circuit
3.20
power of the compensated circuit
P
c
active power at the input of the compensated circuit
3.21
voltage
U
F
voltage across the terminals of the inductor coil or system of inductor coils
3.22
furnace current
I
F
current absorbed by the inductor coil or the syst
...