IEC 60519-11:2007

INTERNATIONAL IEC
STANDARD
CEI
60519-11
NORME
Second edition
INTERNATIONALE
Deuxième édition
2007-06
Safety in electroheat installations –
Part 11:
Particular requirements for installations using the
effect of electromagnetic forces on liquid metals

Sécurité dans les installations électrothermiques –
Partie 11:
Exigences particulières pour les installations
utilisant l’effet des forces électromagnétiques
sur les métaux liquides
Reference number
Numéro de référence
IEC/CEI 60519-11:2007
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INTERNATIONAL IEC
STANDARD
CEI
60519-11
NORME
Second edition
INTERNATIONALE
Deuxième édition
2007-06
Safety in electroheat installations –
Part 11:
Particular requirements for installations using the
effect of electromagnetic forces on liquid metals

Sécurité dans les installations électrothermiques –
Partie 11:
Exigences particulières pour les installations
utilisant l’effet des forces électromagnétiques
sur les métaux liquides
PRICE CODE
P
CODE PRIX
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
Pour prix, voir catalogue en vigueur

– 2 – 60519-11 © IEC:2007
CONTENTS
FOREWORD.3

1 Scope.5
2 Normative references.5
3 Terms and definitions .6
4 Inductor .7
5 Capacitors .7
6 Mains-frequency power sources .8
7 Solid-state frequency converters .8
8 Switchgear.9
9 Cables, wires and busbars .9
10 Liquid cooling .10
11 Rating plate .10
12 Clearance and creepage distances .11
13 Protection against electric shock.11
13.1 Protection against direct contact .11
13.1.1 Permissible touch voltage as a function of frequency.11
13.1.2 Accessibility of electrical equipment .11
13.1.3 Accessible plugs and sockets.11
13.1.4 Special requirements for live conductors at voltage bands 2 and 3 .11
13.2 Protection against indirect contact .12
13.2.1 Permissible touch voltage as a function of duration and frequency.12
13.2.2 Electrical insulation resistance .12
13.3 Special requirements .12
13.4 Earthing provisions .13
13.5 Protective conductors .13
14 Radio interferences.14
15 Operation instructions.14

Annex A (normative) Specific requirements for electromagnetic pouring equipment .15
Annex B (normative) Specific requirements for electromagnetic equipment with lining.16

60519-11 © IEC:2007 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
______________
SAFETY IN ELECTROHEAT INSTALLATIONS –

Part 11: Particular requirements for installations using the effect of
electromagnetic forces on liquid metals

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 60519-11 has been prepared by IEC technical committee 27:
Industrial electroheating equipment.
This second edition cancels and replaces the first edition published in 1997 and constitutes a
technical revision. The significant changes with respect to the previous edition are as follows:
• the latest editions of IEC 60519-1:2003 and IEC 60519-3:2005 have been taken into
account;
• definitions have been brought into line with the second edition of IEC 60050-841:2004.
This standard is to be used in conjunction with IEC 60519-1:2003. It is intended to specify
particular requirements for installations using the effect of electromagnetic forces on liquid
metals.
– 4 – 60519-11 © IEC:2007
The text of this standard is based on the following documents:
FDIS Report on voting
27/577/FDIS 27/585/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 list of all parts of the IEC 60519 series, under the general title Safety in electroheat
installations, can be found on the IEC website.
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.
60519-11 © IEC:2007 – 5 –
SAFETY IN ELECTROHEAT INSTALLATIONS –

Part 11: Particular requirements for installations using the effect of
electromagnetic forces on liquid metals

1 Scope
This part of IEC 60519 applies to installations predominantly using the effect of
electromagnetic forces on liquid metals:
− installations for electromagnetic (induction) stirring or transport of liquid metals at low
frequencies;
− installations that influence the pouring process by an electromagnetic field;
− parts directly affected by the electromagnetic stirring, transport or pouring installation.
Examples of application:
− stirring devices for casting machines, arc furnaces, ladles, etc.;
− transport of liquid metal for emptying or filling furnaces, launders or moulds;
− devices to transport liquid metal with simultaneous proportioning of the transported
quantity, for example, for filling diecasting machines;
− influencing the ingot surface or the pouring stream enhancing crystallization by means of
an electromagnetic field during continuous casting;
− sealing of mechanical gaps of melt vessels, for example, in vertical galvanizing line.
This standard consists of
− requirements common to installations using the effect of electromagnetic forces on liquid
metals;
− specific requirements for electromagnetic pouring equipment (Annex A);
− specific requirements for electromagnetic equipment with lining (Annex B).
NOTE When applying IEC 60519-1 in conjunction with this standard, the terms "electroheat installation" or
"electroheat device" should be replaced by the term "installation using the effect of electromagnetic forces on liquid
metals".
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 60050-841:2004, International Electrotechnical Vocabulary – Part 841: Industrial
electroheat
IEC 60110-1:1998, Power capacitors for induction heating installations – Part 1: General

– 6 – 60519-11 © IEC:2007
IEC 60143-1:2004, Series capacitors for power systems – Part 1: General
IEC 60364-4-41:2005, Low-voltage electrical installations – Part 4-41: Protection for safety –
Protection against electric shock
IEC 60519-1:2003, Safety in electroheat installations – Part 1: General requirements
CISPR 11, Industrial, scientific and medical (ISM) radio-frequency equipment –
Electromagnetic disturbance characteristics – Limits and methods of measurement
3 Terms and definitions
For the purpose of this document, the terms and definitions given in IEC 60519-1 and
IEC 60050-841 (some of which are repeated here), as well as the following apply.
3.1
installation using the effect of electromagnetic forces on liquid metals
installation composed of the inductor and the electric and mechanical equipment used to
exercise an intended effect of electromagnetic forces on liquid metals
3.2
electromagnetic stirring of liquid metals
procedure to achieve stirring motion in liquid metals by using an electromagnetic field
[IEV 841-27-24, modified]
3.3
electromagnetic transport of liquid metals
procedure to move liquid metals in a defined direction using an electromagnetic field
[IEV 841-27-25, modified]
3.4
electromagnetic casting of liquid metals
procedure to shape the liquid metal stream or to influence its surface quality after pouring by
the use of an electromagnetic field
[IEV 841-27-26]
3.5
enhancing crystallization of liquid metal in electromagnetic fields
procedure to shape a form and structure of metal crystals in an electromagnetic field
[IEV 841-27-27]
3.6
inductor
part of an installation (for example, coil(s)) using the effect of electromagnetic forces on liquid
metals which produces the electromagnetic field to yield the required electrodynamic force
NOTE Inductor is defined in IEV 841-27-47, but for the purpose of this standard this more specific definition is
needed.
60519-11 © IEC:2007 – 7 –
4 Inductor
4.1 Inductors with high power ratings may be equipped with yokes (coil flux guides) to guide
the magnetic flux outside the induction coil(s) to reduce stray fields possibly heating the
surrounding metal structure.
The design of these yokes should take care of the risk of them being excessively heated by
eddy currents.
4.2 Where the inductor or parts of it are intended to be replaced due to wear or exchanged to
meet a new production requirement, the manufacturer's instructions shall be followed.
4.3 Should the effect of cooling of the inductor become insufficient and cause danger to
personnel or damage to essential parts of the equipment, an alarm signal shall be given and
the power switched off automatically.
In the case where a sudden interruption of power could cause a possible hazard to personnel,
due to liquid metal splashes, a controllable reduction of power is recommended.
4.4 For installations using the effect of electromagnetic forces on liquid metals with forced
cooled inductors having a charge and/or lining of high heat capacity, it is advisable to have an
emergency supply for cooling the coil(s) and, where applicable, the conveying equipment until
the hot charge has been removed and until the lining has cooled to a safe temperature.
4.5 The design of the inductor shall take into account the concentrated electromagnetic
forces due to the high values of low-frequency current in the coil(s) that can produce vibrations
and local field concentrations.
4.6 The inductor shall be designed and manufactured so as to meet the difficult operational
and environmental requirements, for example, the presence of water spray, steam and heat
radiation.
4.7 Design of components in the vicinity of the inductor shall take into account the influence
of electromagnetic fields. Apart from suitable material and shape, further measures can be
required such as screening, insulation, forced cooling and avoidance of closed metallic loops in
order to keep the electromagnetic and thermal influences within admissible limits.
5 Capacitors
5.1 This clause deals with power capacitors. Other capacitors, for example, installed in
control circuits, are covered by 6.2.4 of IEC 60519-1.
5.2 All necessary precautions shall be taken to rapidly discharge capacitors which could be
dangerous to touch after they have been switched off.
A warning notice shall be displayed in a visible position stating that the discharge shall be
effected before touching the capacitors.
5.3 For capacitors permanently connected in parallel to an inductor or a transformer, the
discharge device may be dispensed with.

– 8 – 60519-11 © IEC:2007
Where capacitors connected in parallel to an inductor or a transformer are disconnected only in
the off-load condition, the discharge device may be dispensed with, providing a sufficient time
delay occurs for the discharge between switching off the supply and opening the capacitor
switch.
If there is a risk of d.c. charging, the discharge device is indispensable.
5.4 Capacitors that are switched on load or connected via external fuses shall have discharge
facilities.
5.5 Information on the requirements for the discharge of series connected capacitors is given
in 6.8, 6.9 and 6.10 of IEC 60110-1 and in 5.1 of IEC 60143-1.
5.6 The terminals of capacitors with internally series-connected elements shall be short-
circuited before being disconnected.
NOTE Although a discharge device has operated, a residual charge may sometimes remain at the
interconnections of series-connected capacitors due to blown fuses, interrupted internal connections, differences of
the capacitance values or dielectric recharging from d.c. components of the previous charge.
5.7 Capacitors in installations without electronic power control shall be connected via
protective devices. Where internal fuses are employed, external means of protection can be
dispensed with.
5.8 Where capacitors are liquid-cooled, the provision given in 6.2.8 of IEC 60519-1 shall
apply.
6 Mains-frequency power sources
In the case of mains-frequency power sources which feed a single-phase load from a three-
phase supply and which employ capacitors and reactors to keep the three line currents in
reasonable balance, series resonance causing overvoltages liable to impair safety may occur if
the phase connection common to the capacitors and reactors of the balancing circuit becomes
open-circuited, for example, by a blown fuse or a defective contactor in the line.
For such conditions measures shall be provided to disconnect the supply, for example,
overvoltage tripping of the supply circuit-breaker.
Contactors which control the three-phase supply to the reactor-capacitor combination shall be
designed to ensure that the contact connected to the common point of the reactor and
capacitor closes earlier when switching on and opens later when switching off.
Design shall take care of the risk of possible harmonic currents absorbed from the supply
system due to parallel resonance.
7 Solid-state frequency converters
7.1 Solid-state frequency converters shall be protected at the input terminals to prevent
transient overvoltages, which may occur during switching operations on the supply side,
ensuring that safety is maintained.

60519-11 © IEC:2007 – 9 –
7.2 Solid-state frequency converters shall have fast-acting overvoltage and overcurrent
protection.
7.3 Additional measures shall be taken to avoid the occurrence of dangerous transient
voltages due to rapid changes of load power.
7.4 Hazards that may occur to personnel in case of a fault due to stored energy shall be
avoided by suitable measures.
8 Switchgear
8.1 Design of the switchgear operated off-load shall take into account the time behaviour of
the converters, reactances (transformers and reactors) and capacitors.
8.2 Design of switchgear shall take into account not only the fundamental component of the
current, but also the harmonics which may occur.
8.3 When switching capacitors on-load, the following points among others shall be considered
when a switching device or method is chosen.
• When switching on, high current peaks at high frequency may occur.
• When switching off, dangerous levels of overvoltage as a result of restriking of the
switching device shall be avoided.
9 Cables, wires and busbars
9.1 Cables, wires and busbars shall be so dimensioned and arranged that inadmissible
heating is avoided, taking into account the magnitude and frequency of their current loadings.
NOTE Tables of cable current carrying values relevant for mains frequency (50 Hz/60 Hz) are generally not
applicable for installations working at higher frequencies.
In the case of parallel connections, care shall be taken to avoid over-heating of individual
conductors due to unequal sharing of current.
Care shall be taken to avoid excessive heating of neighbouring constructions by stray fields.
9.2 Where cables, wires or busbars are force cooled, the provisions given in 6.2.8, 6.6.1 and
6.6.2 of IEC 60519-1 shall apply.
9.3 The individual overcurrent protection devices of the installation may be dispensed with for
internal connections between components such as converters, transformers, capacitors,
switchgear, inductors and contact systems, provided such connections are short-circuit and
earth-leakage proof.
NOTE This is deemed to be the case with cables or arrangements of solid wires or single cores where contact with
one another (also with earthed parts) is prevented by using sufficient clearances, spacers or insulating shims, by
laying the conductors in separate conduits of insulating material or by using cables or wires that are considered to
be short-circuit proof by their design.
The short-circuit strength mentioned above may be dispensed with for medium- and high-frequency installations if
sufficient short-circuit protection is ensured by the design of the frequency converter, for example, solid-state
equipment.
– 10 – 60519-11 © IEC:2007
The design shall take care to avoid excessive internal over-currents.
9.4 Cables and wires, which are part of the heating section, are normally provided with an
insulation that shall resist high mechanical and thermal stresses. In the majority of cases this
insulation is insufficient for protection against electric shock. For this reason measures shall be
taken for the prevention of inadvertent contact with these cables and wires during operation, if
the permissible touch voltage (13.1.1) is exceeded.
9.5 When choosing cables or leads to feed the inductor, the effect of heat radiation and the
presence of water or steam shall be taken into account. There may be a need for special
measures to protect them, for example, screening, forced cooling or casings.
10 Liquid cooling
Subclause 6.6 of IEC 60519-1 applies with the following additional requirements.
10.1 In textile-reinforced hoses, moisture is likely to creep along the textile reinforcement
creating potential differences between the reinforcement and the coolant, possibly
overstressing the electrical insulation of the hose.
This shall be taken into account in the choice of material and the arrangement of hoses.
10.2 Certain liquid-cooled components (for example, inductors with water-cooled housing,
ceramic capacitors, water jackets of electronic tubes) are extremely sensitive to pressure.
Deviating from the requirements of 6.6.4 of IEC 60519-1, they shall withstand the rated service
pressure only. Their water connections, however, shall withstand 1,5 times the rated service
pressure.
Pressure peaks potentially caused by switching valves shall be taken into account.
10.3 Cooling below dew point shall be avoided as it can cause condensation, for example, at
the coil of the inductor and its terminals possibly leading to a short circuit.
10.4 Water used for cooling of live parts and magnetic cores shall be of particularly high
quality and shall not contain dirt and/or ferromagnetic particles.
10.5 When opening the cooling circuit, for example, when changing the inductor, care shall be
taken to avoid any contamination of the water.
10.6 Where the water cooling is employed to dissipate the electrical losses and, in addition, to
protect the inductor and/or the cables or leads against radiated heat from the charge, the flow
of water shall remain even with the electric power switched off until there is no longer a heat
hazard.
11 Rating plate
Clause 15 of IEC 60519-1 applies with the following additional requirements.

60519-11 © IEC:2007 – 11 –
The principal components of installations using the effect of electromagnetic forces on liquid
metals (for example, inductors) shall have individual rating plates.
The manufacturer and/or supplier of industrial, scientific and medical (ISM) radiofrequency
equipment, as defined by CISPR 11 shall insure that the user is informed about the class and
group of the equipment, either by labelling or by the accompanying documentation.
12 Clearance and creepage distances
The clearance and creepage distances employed for medium-frequency installations are not
necessarily the same as those used for mains frequency (50 Hz/60 Hz).
Where reduced values are employed, for example for medium-frequency converters, measures
shall be taken to prevent flashovers impairing safety.
13 Protection against electric shock
Clause 9 of IEC 60519-1 applies with the following additions or modifications.
13.1 Protection against direct contact
Clause 412 of IEC 60364-4-41 applies with the following additions or modifications.
13.1.1 Permissible touch voltage as a function of frequency
The limit of permissible touch voltage is a function of frequency; this limit increases with
frequency. Recommended limit levels are under consideration and where national standards
exist they shall apply.
13.1.2 Accessibility of electrical equipment
All parts of the installations using electromagnetic forces on liquid metals having electrical
equipment, for example, capacitors, reactors, transformers, heating inductors or contact
systems, switchgear, cables and busbar connections, shall be located inside enclosures or be
otherwise adequately protected against direct contact. It shall not be possible to open the doors
or remove the covers giving access to those parts of the equipment with voltages of bands 2
and 3 without the use of a tool, for example, a spanner or a lock, the key of which is available
only to an authorized person.
13.1.3 Accessible plugs and sockets
Accessible plugs and sockets etc. for d.c., a.c. or high-frequency voltages greater than 500 V
which must not be interchangeable shall be automatically switched off before or when being
disconnected in service to avoid hazard to personnel. This may be achieved by the use of
mechanical interlocks.
13.1.4 Special requirements for live conductors at voltage bands 2 and 3
Live conductors at voltage bands 2 and 3 shall be inaccessible except where the following
conditions exist.
– 12 – 60519-11 © IEC:2007
For voltages in band 2: access shall be restricted to authorized persons. In addition, for
voltages in band 3 the design shall be such as to prevent inadvertent contact by authorized
persons who are carrying out fault-finding, testing and repair. This may be achieved, for
example, by one or more of the following measures.
a) Use of bolted-on covers
Access is only possible with the power switched off.
b) Hinged lockable doors or hinged internal screens
A positively operated, non-resettable safety switch shall be fitted to ensure that the door is
closed before restoration of power and means provided to bring out leads of appropriate
specification to externally connected test instrumentation.
c) Internal screens and insulation
Internally fixed screens or insulation shall be employed covering positions where voltage
test points are required; the screen shall have holes or slots whose dimensions allow
insertion of test probes.
13.2 Protection against indirect contact
Clause 413 of IEC 60364-4-41 applies with the following additions or modifications.
13.2.1 Permissible touch voltage as a function of duration and frequency
As stated in 13.1.1, the permissible touch voltage increases with frequency. This shall be taken
into consideration when drawing information from the existing values of limit levels for mains
frequency.
Limit levels for voltage band 3 and for frequencies other than mains are under consideration.
13.2.2 Electrical insulation resistance
The electrical insulation resistance of parts of installations using the effect of electromagnetic
forces on liquid metals varies throughout the process cycle due to changes of temperature, the
electrical insulation, lining and electrical components, for example, capacitors, water-cooled
windings and particularly the temperature and quality of water employed.
A value of minimum electrical insulation resistance is normally not given, and therefore it is
necessary to take these variations into account when setting the operating levels of protective
devices, for example, earth leakage detection at the time of commissioning the installation.
Induction heating installations often have considerable leakage currents. This may necessitate
electrical isolation of the installation using the effect of electromagnetic forces on liquid metals
from the power supply mains.
13.3 Special requirements
The manufacturer shall make the following statements in the operation manual:
− metal rings and bracelets shall not be worn near strong electromagnetic fields of medium
and high frequencies (for example, in the vicinity of inductors);

60519-11 © IEC:2007 – 13 –
− strong electromagnetic fields may create a hazard to persons with metallic implants,
artificial pacemakers and other similar items; appropriate safety measures shall be applied
in compliance with the relevant local work safety regulations.
13.4 Earthing provisions
Clauses 11 and 12.2 of IEC 60519-1 apply with the following additions or modifications.
13.4.1 If live parts are connected to earth, via resistors, impedances or arresters in an
installation which is electrically isolated from the supply mains, the earth connections shall be
dimensioned thermally and dynamically for the highest current occurring in case of fault. The
current flowing in these earth connections shall be monitored. If the maximum limit admissible
in operation is exceeded, an alarm shall be given and the installation switched off
automatically.
Monitoring is not necessary in the case of connections that serve for the discharge of
electrostatic charges or the like and in high-frequency applications where the inductor is
protected by guards which, when removed, prevent operation of the heater.
13.4.2 When using protective earthing, consideration shall be given to the frequency
dependence of the loop impedance formed by the current source, the active conductors and
the earthing system.
13.4.3 It may be necessary to operate, without connection to earth, metal parts which are
influenced directly by the electromagnetic field, in order to avoid closed metal loops and
thereby maintain electromagnetic and thermal effects within acceptable limits, in which case
other means of protection shall apply.
Where these parts are liable to be at a voltage exceeding the permissible touch voltage level
(see 13.2.1) access by operating personnel shall not be possible. If this cannot be avoided for
reasons of space, requirements, or due to the mode of operation of the installation, protection
of personnel shall be ensured by other means given in the operating instructions.
13.4.4 All sheathed cables, conduits or pipes passing through those parts of an enclosure
containing high-voltage circuits in the voltage band 2 shall be earthed at the point where they
pass through the enclosure.
13.5 Protective conductors
13.5.1 The permissible material for protective conductors for low-frequency equipment is
copper, aluminium or galvanized steel strip. For medium- or high-frequency equipment, copper
or aluminium should be used.
On dimensioning the cross-sectional areas, due consideration shall also be given to the
discharge current of capacitors.
The decrease of the penetration depth of the current with the increase of frequency shall be
taken into consideration, when dimensioning the cross-sectional area of the protective
conductor.
13.5.2 If frequent change of inductor(s) is possible due to the mode of operation, special
consideration shall be given to a safe and reliable connection of parts of the metal inductor
sheathing between each other and in addition to the protective earth conductor.

– 14 – 60519-11 © IEC:2007
13.5.3 There is a constant load on the protective earth conductor caused by an operational
leakage current which shall be taken into consideration when determining the dimensions.
Monitoring of the leakage current is recommended provided that the installation provides the
possibility to do so.
14 Radio interferences
Care should be taken to avoid radio interferences when equipment using the effect of
electromagnetic forces on liquid metals is operated. Guidance may be given by national or
international standards (see also 6.4 of IEC 60519-1).
For the operation of low-frequency installations without an intermediate d.c. circuit, the
particular influences on the supply system shall be taken into account, for example, a pulsation
of power.
15 Operation instructions
15.1 If installations using the effect of electromagnetic forces on liquid metals are operated
with adjustable frequency, suitable measures shall be taken to ensure that the permissible
frequency range is not exceeded or attained.
15.2 If, for installations using the effect of electromagnetic forces on liquid metals, different
maximum currents are permitted, for example, depending on the frequency, individual
monitoring devices shall be provided to assure suitable protective measures.
15.3 For ingot stirring units, it shall be ensured that during starting operation the stirring
installation is only switched on when the cold ingot is beyond the range of influence of the
electromagnetic field.
60519-11 © IEC:2007 – 15 –
Annex A
(normative)
Specific requirements for electromagnetic pouring equipment

A.1 Protective measures shall be provided to give alarm and de-energize the equipment in
the event of a failure with danger for personnel, equipment or processing.
A.2 Malfunction of the electromagnetic pouring system may result from a run-out of metal
which is not controllable by electrical measures. For this reason, safety of personnel shall be
ensured by means other than electrical ones.

– 16 – 60519-11 © IEC:2007
Annex B
(normative)
Specific requirements for electromagnetic equipment with lining

B.1 Molten metal breaking through the inductor lining represents a hazard to personnel and
equipment. The lining thickness varies throughout its operating life. Furthermore sudden
deteriorations, for example by thermal and mechanical shocks, may be experienced.
To reduce these hazards the state of the inductor lining shall be checked at reasonable
intervals. This may be effected by
a) evaluations of electrical parameters of the installation;
b) visual inspection;
c) checking the condition of the lining at different positions;
d) temperature control (inductor case and coolant).
B.2 In order to ensure safety of personnel and to reduce risk of damage to the
electromagnetic equipment, it is recommended that alarm devices and means to disconnect the
supply from the electromagnetic equipment in case of risk of breakthrough of the refractory
lining, should be provided.
___________
– 18 – 60519-11 © CEI:2007
SOMMAIRE
AVANT-PROPOS .19

1 Domaine d’application.21
2 Références normatives .21
3 Termes et définitions .22
4 Inducteur .23
5 Condensateurs .23
6 Sources d’alimentation à fréquence du réseau .24
7 Convertisseurs statiques de fréquence.24
8 Appareillage de connexion .25
9 Câbles, conducteurs et jeux de barres .25
10 Refroidissement par un liquide.26
11 Plaque signalétique.26
12 Distances d’isolement dans l’air et lignes de fuite.27
13 Protection contre les chocs électriques .27
13.1 Protection contre les contacts directs.27
13.1.1 Tension de contact admissible en fonction de la fréquence.27
13.1.2 Accessibilité de l’équipement électrique .27
13.1.3 Fiches et socles de prises de courant accessibles.27
13.1.4 Exigences particulières pour les conducteurs actifs des domaines de
tension 2 et 3.27
13.2 Protection contre les contacts indirects .28
13.2.1 Tension de contact admissible en fonction de la durée et de la
fréquence .28
13.2.2 Résistance d’isolement électrique .28
13.3 Exigences particulières.28
13.4 Dispositions en vue de la mise à la terre .29
13.5 Conducteurs de protection .29
14 Perturbations radioélectriques.30
15 Instructions d’exploitation.30

Annexe A (normative) Exigences particulières pour les installations pour coulée
électromagnétique.
Annexe B (normative) Exigences particulières pour les installations électromagnétiques
avec garnissage.32

60519-11 © CEI:2007 – 19 –
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
_____________
SÉCURITÉ DANS LES INSTALLATIONS ÉLECTROTHERMIQUES –

Partie 11: Exigences particulières pour les installations utilisant l'effet
des forces électromagnétiques sur les métaux liquides

AVANT-PROPOS
1) La Commission Electrotechnique Internationale (CEI) est une organisation mondiale de normalisation composée
de l'ensemble des comités électrotechniques nationaux (Comités nationaux de la CEI). La CEI a pour objet de
favoriser la coopération internationale pour toutes les que
...