EN 60034-18-31:1994
(Main)Rotating electrical machines - Part 18: Functional evaluation of insulation systems - Section 31: Test procedures for form-wound windings - Thermal evaluation and classification of insulation systems used in machines up to and including 50 MVA and 15 kV
Rotating electrical machines - Part 18: Functional evaluation of insulation systems - Section 31: Test procedures for form-wound windings - Thermal evaluation and classification of insulation systems used in machines up to and including 50 MVA and 15 kV
Provides procedures for the thermal evaluation and classification of insulation systems used in machines up to and including 50 MVA and 15 kV. Should be used in conjunction with section 1.
Drehende elektrische Maschinen - Teil 18: Funktionelle Bewertung von Isoliersystemen - Hauptabschnitt 31: Prüfverfahren für Wicklungen mit vorgeformten Elementen - Thermische Bewertung und Klassifizierung von Isoliersystemen für Maschinen bis einschließlich 50 MVA und 15 kV
Machines électriques tournantes - Partie 18: Evaluation fonctionnelle des systèmes d'isolation - Section 31: Procédures d'essai pour enroulements préformés - Evaluation thermique et classification des systèmes d'isolation utilisés dans les machines jusqu'à et y compris 50 MVA et 15 kV
Donne les procédures particulières pour l'évaluation thermique et la classification des systèmes d'isolation utilisés dans les machines jusqu'à et y comrpis 50 MVA et 15 kV. Doit être utilisée conjointement avec la section 1.
Rotating electrical machines - Part 18: Functional evaluation of insulation systems - Section 31: Test procedures for form-wound windings - Thermal evaluation and classification of insulation systems used in machines up to and including 50 MVA and 15 kV (IEC 60034-18-31:1992)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60034-18-31:1999
01-junij-1999
Rotating electrical machines - Part 18: Functional evaluation of insulation systems
- Section 31: Test procedures for form-wound windings - Thermal evaluation and
classification of insulation systems used in machines up to and including 50 MVA
and 15 kV (IEC 60034-18-31:1992)
Rotating electrical machines -- Part 18: Functional evaluation of insulation systems --
Section 31: Test procedures for form-wound windings - Thermal evaluation and
classification of insulation systems used in machines up to and including 50 MVA and 15
kV (IEC 60034-18-31:1992)
Drehende elektrische Maschinen -- Teil 18: Funktionelle Bewertung von Isoliersystemen
-- Hauptabschnitt 31: Prüfverfahren für Wicklungen mit vorgeformten Elementen -
Thermische Bewertung und Klassifizierung von Isoliersystemen für Maschinen bis
einschließlich 50 MVA und 15 kV
Machines électriques tournantes -- Partie 18: Evaluation fonctionnelle des systèmes
d'isolation -- Section 31: Procédures d'essai pour enroulements préformés - Evaluation
thermique et classification des systèmes d'isolation utilisés dans les machines jusqu'à et
y compris 50 MVA et 15 kV
Ta slovenski standard je istoveten z: EN 60034-18-31:1994
ICS:
29.080.30 Izolacijski sistemi Insulation systems
29.160.01 Rotacijski stroji na splošno Rotating machinery in
general
SIST EN 60034-18-31:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60034-18-31:1999
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SIST EN 60034-18-31:1999
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SIST EN 60034-18-31:1999
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SIST EN 60034-18-31:1999
NORME CEI
I EC
INTERNATIONALE
34-18-31
INTERNATIONAL
Première édition
STANDARD First edition
1992-07
Machines électriques tournantes
Partie 18:
Evaluation fonctionnelle des systèmes d'isolation
Section 31: Procédures d'essai pour enroulements
préformés — Evaluation thermique et classification
des systèmes d'isolation utilisés dans les machines
jusqu'à et y compris 50 MVA et 15 kV
Rotating electrical machines
Part 18:
Functional evaluation of insulation systems
Section 31: Test procedures for form-wound
windings — Thermal evaluation and classification of
insulation systems used in machines up to and
including 50 MVA and 15 kV
© CEI '1992 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
utilisée sous quelque forme que ce soit et par aucun pro- any form or by any means, electronic or mechanical,
cédé, électronique ou mécanique, y compris la photocopie et including photocopying and microfilm, without permission
les microfilms, sans raccord écrit de l'éditeur.
in writing from the publisher.
Genève, Suisse
Bureau Central de la Commission Electrotechnique Inte rnationale 3, rue de Varembé
Commission Electrotechnique Internationale CODE PRIX
International Electrotechnical Commission PRICE CODE
IEC Meerayiapogiaa 3nerrporeXHH4ecHaa KOMHCCNA
• • Pour prix, voir catalogue en vigueur
For price, see current catalogue
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SIST EN 60034-18-31:1999
34-18-31 ©IEC – 3 –
CONTENTS
Page
FOREWORD 5
INTRODUCTION 7
Clause
1 Scope 9
2 Normative references 9
3 General considerations 9
9
3.1 Relationship to Section 1
3.2 Designation of test procedures 9
11
3.3 Reference insulation system
11 Verification of diagnostic tests 3.4
13
4 Test objects and test specimens
13
4.1 Construction of test objects
13
4.2 Number of test specimens
13
4.3 Quality assurance tests
13
4.4 Initial diagnostic tests
13
5 Thermal ageing sub-cycles
13 Ageing temperatures and sub-cycle lengths 5.1
15 Means of heating 5.2
Ageing procedure 15
5.3
15
6 Diagnostic sub-cycle
15
6.1 Mechanical test
17
6.2 Moisture test
19
6.3 Voltage test
21
6.4 Other diagnostic tests
21
7 Analyzing, reporting and classification
23
Annex A - Formette construction (example)
24
Figures
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SIST EN 60034-18-31:1999
34-18-31
© IEC
INTERNATIONAL ELECTROTECHNICAL COMMISSION
ROTATING ELECTRICAL MACHINES
Part 18: Functional evaluation of insulation systems
Section 31: Test procedures for form-wound windings –
Thermal evaluation and classification of insulation systems
used in machines up to and including 50 MVA and 15 kV
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.
They have the form of recommendations for international use and they are accepted by the National
2)
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 section of International Standard IEC 34-18 has been prepared by Sub-Committee 2J:
Classification of insulation systems for rotating machinery, of IEC Technical Committee
No. 2: Rotating machinery.
The text of this section is based on the following documents:
Six Months' Rule Repo rt on Voting
2J(CO)10
2J(CO)6
Full information on the voting for the approval of this section can be found in the Voting
Repo rt indicated in the above table.
This standard forms section 31 of a series of publications dealing with functional evalu-
rts being:
ation of insulation systems for rotating electrical machines, other pa
Section 1: General guidelines (IEC 34-18-1)
Section 21: Test procedures for wire-wound windings (IEC 34-18-21).
Annex A is for information only.
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SIST EN 60034-18-31:1999
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INTRODUCTION
Section 1 of IEC 34-18 presents general guidelines for the evaluation and classification of
insulation systems used in rotating electrical machines.
Section 31 deals exclusively with insulation systems for form-wound windings.
This section gives test procedures for thermal evaluation and classification.
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SIST EN 60034-18-31:1999
34-18-31 © IEC – 9 –
ROTATING ELECTRICAL MACHINES
Part 18: Functional evaluation of insulation systems
Section 31: Test procedures for form-wound windings –
Thermal evaluation and classification of insulation systems
used in machines up to and including 50 MVA and 15 kV
1 Scope
This section of IEC 34-18 gives test procedures for the thermal evaluation and classifi-
cation of insulation systems used or proposed for use in a.c. or d.c. rotating electrical
machines up to and including 50 MVA and 15 kV using form-wound windings. The test
procedures are comparative in that the performance of a candidate insulation system is
compared to that of a reference insulation system with proven service experience.
Section 31 shall be used in conjunction with Section 1.
NOTES
1 At the present time limited experience exists on insulation systems above 6,6 kV, using the test
procedures given in this section.
2 Large machines, especially those using bars, may require special thermal evaluation test procedures
which are not included in this section.
2 Normative references
Clause 2 of Section 1 is applicable.
3 General considerations
3.1 Relationship to Section 1
Section 1 describes general testing principles applicable to thermal endurance testing of
insulation systems in rotating electrical machines. Unless the procedures of this section
indicate otherwise, the principles of Section 1 shall be followed.
3.2 Designation of test procedures
Each thermal endurance test is performed in cycles, each cycle consisting of a thermal
ageing sub-cycle and a diagnostic sub-cycle. The diagnostic tests may include a mecha-
nical test, a moisture test, voltage tests and other diagnostic tests, performed in that
order. Diagnostic tests shall be chosen from those listed in clause 6; not all of the tests
need necessarily be applied in a particular evaluation procedure.
NOTE - The thermal classification of an insulation system may depend on the selected diagnostic
procedure.
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SIST EN 60034-18-31:1999
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The following choices for a mechanical test are given in 6.1:
rvice stresses;
A general mechanical test, with stresses comparable to se
B shake-table test, with specified vibrational amplitude;
S special mechanical test;
N no mechanical test.
The following choices for a moisture test are given in 6.2:
- A general moisture test;
B moisture test with water immersion;
S special moisture test;
N no moisture test.
The following choices for a voltage test are given in 6.3:
- A general voltage test;
B voltage test of immersed test specimens;
S special voltage test;
N no voltage test.
The following choices for other diagnostic tests are given in 6.4:
A informative diagnostic tests;
S diagnostic tests used for end-point determination;
N no other diagnostic test.
A test procedure shall be referred to as:
IEC 34-18-31, Procedure MHED
where
M is the mechanical test A, B, S, or N, according to 6.1;
H is the moisture test A, B, S, or N, according to 6.2;
E is the voltage test A, B, S, or N, according to 6.3;
D is the other diagnostic test A, S, or N, according to 6.4.
Example: Insulation system "Nec plus ultra" has been assigned thermal class F, according
to IEC 34-18-31 Procedure BAAN.
3.3 Reference insulation system
A reference insulation system shall be tested using a test procedure equivalent to that for
the candidate system (see Section 1).
3.4 Verification of diagnostic tests
Preliminary ageing tests according to 5.3.4 of Section 1 to check the feasibility of the
diagnostic sub-cycle, may be performed, when appropriate.
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4 Test objects and test specimens
4.1 Construction of test objects
Tests for the selection of materials according to 5.2.1 of Section 1 may be performed, as
appropriate.
Test objects may be actual machines, machine components or models. The components
and models should embody all the essential elements.
Insulation thickness, creepage distances, and discharge protection, where required, shall
be appropriate for the intended maximum rated voltage and equipment standards or
practices.
Test specimens simulating parts of a coil or winding may be used for evaluation, if
stresses acting on these parts in service can be reliably reproduced in the test.
Particular types of models, known as formettes, have been used successfully in some
countries and examples of these are illustrated in annex A.
4.2 Number of test specimens
An adequate number of test specimens should be used at each ageing temperature for
each insulation system to obtain good statistical confidence. This number should be not
less than five.
4.3 Quality assurance tests
Before starting the first thermal ageing sub-cycle, the following quality assurance tests
shall be performed:
- visual inspection of the test specimens;
high-voltage tests according to IEC 34-1.
4.4
Initial diagnostic tests
Each completed test object shall be subjected to all the diagnostic tests selected for the
test procedure before starting the first thermal ageing sub-cycle.
5 Thermal ageing sub-cycles
5.1 Ageing temperatures and sub-cycle lengths
5.1.1 Normal procedure
In accordance with 5.3.2.1 of Section 1, the normal ageing procedure requires test speci-
mens to be aged at not less less than three temperatures.
Ageing temperatures and lengths of ageing sub-cycles may be selected from table 2 of
Section 1.
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If the intended thermal class for the candidate insulation system differs from the known
class of the reference system, different ageing temperatures and sub-cycle lengths are to
be selected in an appropriate manner.
The lowest ageing temperature should be selected such as to produce a log mean test life
of about 5 000 h or more. This is generally a
...
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