SIST EN 60034-6:1999

SLOVENSKI STANDARD
SIST EN 60034-6:1999
01-april-1999
Rotating electrical machines - Part 6: Methods of cooling (IC Code) (IEC 60034-
6:1991)
Rotating electrical machines -- Part 6: Methods of cooling (IC Code)
Drehende elektrische Maschinen -- Teil 6: Einleitung der Külverfahren (IC-Code)
Machines électriques tournantes -- Partie 6: Modes de refroidissement (Code IC)
Ta slovenski standard je istoveten z: EN 60034-6:1993
ICS:
29.160.01 Rotacijski stroji na splošno Rotating machinery in
general
SIST EN 60034-6:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60034-6:1999

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SIST EN 60034-6:1999

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SIST EN 60034-6:1999

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SIST EN 60034-6:1999
CEI
NORME
I EC
INTERNATIONALE
34-6
INTERNATIONAL
Deuxième édition
STANDARD Second edition
1991-10
électriques tournantes
Machines
Partie 6:
refroidissement (Code IC)
Modes de
Rotating electrical machines
Part 6:
Methods of cooling (IC Code)
Droits de reproduction réservés—Copyright — all rights reserved
© CEI 1991
ized in
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or util
any form or by any means, electronic or mechanical,
utilisée sous quelque forme que ce soit et par aucun pro-
cédé, électronique ou mécanique, y compris la photocopie et including photocopying and mic rofilm, without permission
les microfilms, sans raccord écrit de l'éditeur. in writing from the publisher.
ationale 3, rue de Varembé Genève, Suisse
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vigueur
Pour prix, voir catalogue en •
•
For price, see current catalogue

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SIST EN 60034-6:1999
34-6©IEC - 3 -
CONTENTS
Page
FOREWORD 5
INTRODUCTION 9
Clause
13
1 Scope
13
2 Definitions
17 3 Designation system
23
4 Characteristic numeral for circuit arrangement
25
5 Characteristic letter for coolant
27
6. Characteristic numeral for method of movement
Annexes
29
A - Commonly used designations
37
B - Comparison of examples from the first and second editions of IEC 34-6

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SIST EN 60034-6:1999
34-6 çO IEC - 5 -
INTERNATIONAL ELECTROTECHNICAL COMMISSION
ROTATING ELECTRICAL MACHINES
Part 6: Methods of cooling (IC Code)
FOREWORD
1) The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees on
which all the National Committees having a special interest therein are represented, express, as nearly as
possible, an international consensus of opinion on the subjects dealt with.
2) They have the form of recommendations for international use and they are accepted by the National
Committees in that sense.
3) In order to promote international unification, the IEC expresses the wish that all National Committees
should adopt the text of the IEC recommendation for their national rules in so far as national conditions will
permit. Any divergence between the IEC recommendation and the corresponding national rules should, as
far as possible, be clearly indicated in the latter.
This part of International Standard IEC 34 has been prepared by Sub-Committee 2H:
Degrees of protection, methods of cooling and mounting arrangements, of IEC Technical
Committee No. 2: Rotating machinery.
It constitutes the second edition of IEC 34-6 and replaces the first edition, issued in 1969.
The text of this part is based on the following documents:
DIS Report on Voting
2H(CO)23 2H(CO)25
Full information on the voting for the approval of this part can be found in the Voting
Report indicated in the above table.
This part
belongs to a series of publications dealing with rotating electrical machinery, the
other pa
rts being:
Part 1: Rating and performance, issued as lEC 34-1.
Part 2:
Methods for determining losses and efficiency of rotating electrical
machinery from tests (excluding machines for traction vehicles), issued as
IEC 34-2.
Part 3:
Specific requirements for turbine-type synchronous machines, issued as
IEC 34-3.
Part 4:
Methods for determining synchronous machine quantities from tests,
issued as IEC 34-4.

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SIST EN 60034-6:1999
34-6 © IEC - 7 -
Part 5: Classification of degrees of protection provided by enclosures of rotating
electrical machines (IP code), issued as IEC 34-5.
Part 7: Symbols for types of construction and mounting arrangements of rotating
electrical machinery, issued as IEC 34-7.
Part 8: Terminal markings and direction of rotation of rotating machines, issued
as IEC 34-8.
Part 9: Noise limits, issued as IEC 34-9.
Part 10: Conventions for description of synchronous machines, issued as
IEC 34-10.
Part 11: Built-in thermal protection. Chapter 1: Rules for protection of rotating
electrical machines, issued as IEC 34-11.
Part 11-2: Built-in thermal protection. Chapter 2: Thermal detectors and control units
used in thermal protection systems, issued as IEC 34-11-2.
rt 11-3:
Pa Built-in thermal protection. Chapter 3: General rules for thermal protectors
used in thermal protection systems, issued as IEC 34-11-3.
Part 12: Starting performance of single-speed three-phase cage induction motors
for voltages up to and including 660 V, issued as IEC 34-12.
Part 13: Specification for mill auxiliary motors, issued as IEC 34-13.
Part 14: Mechanical vibration of ce ain machines with shaft heights, 56 mm and
rt
higher - Measurement, evaluation and limits of the vibration severity,
issued as IEC 34-14.
Part 15: Impulse voltage withstand levels of rotating a.c. machines with form-
wound stator coils, issued as IEC 34-15.
Part
16: Excitation systems for synchronous machines.
Pa
rt 16-1: Excitation systems for synchronous machines. Chapter 1: Definitions.
Part 16-2: Excitation systems for synchronous machines. Chapter 2: Models for
system studies, issued as IEC 34-16-2.
Annexes A and B are for information only.

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SIST EN 60034-6:1999
34-6 ©IEC - 9 -
INTRODUCTION
In this edition of lEC 34-6, the sequence of numerals and letters following the Code letters
IC is changed.
a) New designation system:
A numeral is placed first, indicating the cooling circuit arrangement, being valid
i)
for both primary and secondary circuits.
Each circuit is designated by a letter, indicating the coolant, followed by a
ii)
numeral indicating the method of movement of the coolant.
The letter and numeral for the primary coolant are placed first, then those for the
iii)
secondary coolant.
Example: I C 8 A 1 W
Arrangement
Primary circuit
Secondary circuit
b) Previous designation system:
i) The secondary cooling circuit was designated first, then the primary circuit.
Eadh circuit was designated by a letter, indicating the coolant followed by a
ii)
numeral, indicating the circuit arrangement, and then another numeral indicating the
method of movement of the coolant.
1 C W 3 7 A
Example:
Secondary circuit
Primary circuit
This edition also provides for the designation to be simplified, where possible, by the
omission of the letter A and of the numeral 7 for movement of secondary coolant under
certain conditions.
In addition, new letters F, S, X and Y are provided and defined; the previous letter E,
indicating cooling by evaporation of a liquid, has been omitted.

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SIST EN 60034-6:1999
34-6©IEC – 11 –
With the introduction of the new designation system, clarifications are required to
definitions of open and closed circuit cooling and of dependent and independent compo-
nents (see clause 2).
The mode of connecting the supply and the delivery of the appropriate control equipment
for circulation components, which were specified in the first edition are no longer taken
into account in this second edition.
Where the two systems differ, they can be distinguished both in the complete and the
simplified code.
Examples of cooling according to the first and the second editions are compared in
annex B.

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SIST EN 60034-6:1999
IEC 13 -
34-6 ©
ROTATING ELECTRICAL MACHINES
Part 6: Methods of cooling (IC Code)
1 Scope
of IEC 34 identifies the circuit arrangements and the methods of movement of
This part
the coolant in rotating electrical machines, classifies the methods of cooling and gives a
designation system for them.
The designation of the method of cooling consists of the letters "IC", followed by numerals
and letters representing the circuit arrangement, the coolant and the method of movement
of the coolant.
A complete designation and a simplified designation are defined. The complete designa-
tion system is intended for use mainly when the simplified system is not applicable.
The complete designations, as well as the simplified designations, are illustrated in the
tables of annex A for some of the most frequently used types of rotating machines,
together with sketches of particular examples.
2 Definitions
, the following definitions apply.
For the purpose of this part
procedure by means of which heat resulting from losses occurring in a
2.1 cooling: A
machine is given up to a primary coolant which may be continuously replaced or may itself
be cooled by a secondary coolant in a heat exchanger.
A medium, liquid or gas, by means of which heat is transferred.
2.2 coolant:
2.3 primary coolant: A medium, liquid or gas which, being at a lower temperature than
rt.
a part of a machine and in contact with it, removes heat from that pa
NOTE - A machine may have more than one primary coolant.
2.4 secondary coolant: A medium, liquid or gas which, being at a lower temperature
than the primary coolant, removes the heat given up by this primary coolant by means of a
heat exchanger or through the external surface of the machine.
NOTE - Each primary coolant in a machine may have its own secondary coolant.

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SIST EN 60034-6:1999
34-6 ©IEC - 15 -
2.5 final coolant: The last coolant to which the heat is transferred.
NOTE - In some machines the final coolant is also the primary coolant.
2.6 surrounding medium: The medium, liquid or gas, in the environment surrounding
the machine.
NOTE - The coolant may be drawn from and/or be discharged to this environment.
2.7 remote medium: A medium, liquid or gas, in an environment remote from the
machine and from which a coolant is drawn and/or to which it is discharged through inlet
and/or outlet pipe or duct, or in which a separate heat exchanger may be installed.
2.8 direct cooled winding (inner cooled winding): A winding in which the coolant
rt of the wind-
flows through hollow conductors, tubes or channels which form an integral pa
ing inside the main insulation.
2.9 indirect cooled winding: A winding cooled by any method other than that of 2.8.
NOTE - In all cases when "indirect" or "direct" is not stated, an indirect cooled winding is implied.
2.10 heat exchanger: A component intended to transfer heat from one coolant to
another while keeping the two coolants separate.
2.11 pipe, duct: A passage provided to guide the coolant.
NOTE - The term duct is generally used when a channel passes directly through the floor on which
the machine is mounted. The term pipe is used in all other cases where a coolant is guided outside the
machine or heat exchanger.
2.12 open circuit: A circuit in which the final coolant is drawn directly from the surround-
ing medium or is drawn from a remote medium, passes over or through the machine or
through a heat exchanger, and then returns directly to the surrounding medium or is
discharged to a remote medium.
NOTE - The final coolant will always flow in an open circuit (see also 2.13).
2.13 closed circuit: A circuit in which a coolant is circulated in a closed loop in or
through the machine and possibly through a heat exchanger, while heat is transferred from
this coolant to the next coolant through the su rface of the machine or in the heat
exchanger.
NOTES
1 A general cooling system of a machine may consist of one or more successively acting closed circuits
and always a final open circuit. Each of the primary, secondary and/or final coolants may have its own
appropriate circuit.
2 The different kinds of circuits are stated in clause 4 and in the tables of annex A.

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SIST EN 60034-6:1999
34-6 ©IEC – 17 –
2.14 piped or ducted circuit: A circuit in which the coolant is guided either by inlet or
outlet pipe or duct, or by both inlet and outlet pipe or duct, these serving as separators
between the coolant and the surrounding medium.
NOTE - The circuit may be an open or a closed circuit (see 2.12 and 2.13).
2.15 stand-by or emergency cooling system: A cooling system which is provided in
addition to the normal cooling system and which is intended to be used when the normal
cooling system is not available.
2.16 integral component: A component in the coolant circuit which is built into the
machine and which can only be replaced by partially dismantling the machine.
2.17 machine-mounted component: A component in the coolant circuit which is
mounted on the machine and forms pa rt of it but which can be replaced without disturbing
the main machine.
2.18 separate component: A component in the coolant circuit which is associated with
a machine but which is not mounted on or integral with the machine.
NOTE - This component may be located in the surrounding or a remote medium.
2.19 dependent circulation component: A component in the coolant circuit which for
its operation is dependent on (linked with) the rotational speed of the rotor of the main
machine, e.g. fan or pump on the shaft of the main machine or fan unit or pump unit driven
by the main machine.
2.20 independent circulation component: A component in the coolant circuit which for
its operation is independent of (not linked with) the rotational speed of the rotor of the
main machine, e.g. design with its own drive motor.
3
Designation system
The designation used for the method of cooling of a machine consists of letters and
numerals as stated below:
3.1 Arrangement of the IC Code
The designation system is made up as follows, using the examples IC8A1 W7 for complete
designation and IC81W for simplified designation:

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SIST EN 60034-6:1999
34-6 ©IEC -19 -
W 7
IC 8 A 1
Complete designation
1 W
IC 8 Simplified designation
3.1.1 CODE LETTERS
(International Cooling)
3.1.2 CIRCUIT ARRANGEMENT
designated by a characteristic numeral
in accordance with clause 4
3.1.3 PRIMARY COOLANT
designated by a characteristic letter
in accordance with clause 5
Omitted for simplified designation
if it is A for air
3.1.4 METHOD OF MOVEMENT OF PRIMARY COOLANT
(higher temperature)
designated by a characteristic numeral
in accordance with clause 6
3.1.5 SECONDARY COOLANT
if applicable, designated by a characteristic
letter in accordance with clause 5
Omitted for simplified designation
if it is A for air
3.1.6 METHOD OF MOVEMENT OF SECONDARY COOLANT
(lower temperature)
if applicable, designated by a characteristic
numeral in accordance with clause 6
Omitted in case of the simplified designation
if it is 7 with water (W) for secondary coolant.
NOTE - The following rule may be applied to distinguish between complete and simplified designations:
a complete designation can be recognized by the presence (after the letters IC) of three or five
-
numerals and letters in the regular sequence = numeral, letter, numeral (letter, numeral).
Examples: IC3A1, IC4A1A1 or IC7A1W7;
a simplified designation has two or three consecutive numerals, or a letter in the final position.
Examples: IC31, IC411 or IC71W.
3.2 Application of designations
The simplified designation should preferably be used, i.e. the complete designation
system is intended for use mainly when the simplified system is not applicable.
rts of a machine
3.3 Designation of same circuit arrangements for different pa
Different coolants or methods of movement may be used in different parts of a machine.
rt of the
These shall be designated by stating the designations as appropriate after each pa
machine.

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SIST EN 60034-6:1999
34-6 ©IEC - 21 -
Example for different circuits in rotor and stator:
Rotor IC7H1W Stator IC7W5W (simplified)
(complete)
Rotor IC7H1W7 Stator IC7W5W7
Example for different circuits in a machine:
Generator IC7H1W Exciter IC75W (simplified)
(complete)
Generator IC7H1W7 Exciter IC7A5W7
3.4 Designation of different circuit arrangements for different pa rts of a machine
Different circuit arrangements may be used on different parts of a machine. These shall be
designated by stating the designations as appropriate after each part of the machine,
separated by a stroke.
Example: Generator IC81W Exciter IC75W (simplified)
(complete)
Generator IC8A1 W7 Exciter IC7A5W7
3.5 Designation of direct cooled winding
In the case of machines with direct cooled (inner cooled) windings, the pa rt
...