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BRITISH STANDARD BS EN
60034-18-21:
1994
IEC 34-18-21:
1992
Incorporating
Amendment No. 1
Rotating electrical
machines —
Part 18: Functional evaluation of insulation systems —
Section 21: Test pr
2、ocedures for wire-wound windings — Thermal evaluation and classification
The European Standard EN 60034-18-21:1994 with the incorporation of amendments A1:1996 and A2:1996 has the status of a British Standard
ICS 29.080.01;
3、
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BS EN 60034-18-21:1994
Cooperating organizations
The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national committees of the following countries:
Aust
4、ria Italy Belgium Luxembourg Denmark Netherlands Finland Norway France Portugal Germany Spain
Greece Sweden
Iceland Switzerland
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Ireland United Kingdom
This British Standard, having been prepared under the
5、direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes
into effect on
15 December 1994
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The following BSI references relate to the work on this standard:
Committee reference PEL/1
Announced in BSI News
August 1994
6、
ISBN 0 580 23519 X
Amd. No.
Date
Comments
10264
January
1999
Indicated by a sideline in the margin
Amendments issued since publication
BS EN 60034-18-21:1994
Contents
Page Cooperating organizations Inside front cover National foreword ii
7、 Foreword 2
Text of EN 60034-18-21 5
National annex NA (informative) Committees responsible Inside back cover
National annex NB (informative) Cross-references Inside back cover
8、
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BS EN 60034-18-21:1994
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National foreword
This British Standard has been prepared under the direction of the
Electrotechnical Sector Board and is the English language version of
EN 60034-81-21:1994, Rotating ele
9、ctrical machines. Part 18: Functional evaluation of insulation systems. Section 21: Test procedures for wire-wound windings — Thermal evaluation and classification, including amendments A1:1996 and A2:1996 published by the European Committee for Electrotechnical
Standardization (CENELEC). It is id
10、entical with IEC 34-18-21:1992, including
amendments 1:1996 and 2:1996 published by the International Electrotechnical
Commission (IEC).
A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applica
11、tion.
Compliance with a British Standard does not of itself confer immunity from legal obligations.
Summary of pages
This document comprises a front cover, an inside front cover, pages i and ii, the EN titl
12、e page, pages 2 to 30, an inside back cover and a back cover.
This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.
ii
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EUROPEAN STANDARD NORME EUROPéENNE EUROP?
13、ISCHE NORM
EN 60034-18-21
May 1994
+ A1 and A2
December 1996
UDC
Descriptors: Rotating electrical machine, electrical insulation, winding, test, thermal endurance test, classification
English version
Rotating electrical machines
Part 18: Functional evaluation of insulatio
14、n systems
Section 21: Test procedures for wire-wound windings —
Thermal evaluation and classification
(includes amendments A1:1996 and A2:1996) (IEC 34-18-21:1992 + A1:1996 and A2:1996)
Machines électriques tournantes
Partie 18: Evaluation fonctionnelle des systèmes d’isolation
Section 2
15、1: Procédures d’essai pour
enroulements à fils — Evaluation thermique et classification
(inclut les amendements A1:1996 et A2:1996)
(CEI 34-18-21:1992 + A1:1996 et A2:1996)
Drehende elektrische Maschinen
Teil 18: Funktionelle Bewertung von Isoliersystemen für drehende elektrische Maschinen
16、Hauptabschnitt 21: Prüfverfahren für Runddraht- Wicklungen — Thermische Bewertung und Klassifizierung
(enth?lt ?nderungen A1:1996 und A2:1996) IEC 34-18-21:1992 + A1:1996 und A2:1996)
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This European Standard was approved by CENELEC on 1993-12-08; amendments A1 and A
17、2 were approved by CENELEC on 1996-10-01. 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
18、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 CENEL
19、EC 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norwa
20、y, Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europ?isches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B-1050 Brussels
21、
? 1994 Copyright reserved to CENELEC members
Ref. No. EN 60034-18-21:1994 + A1:1996 + A2:1996 E
EN 60034-18-21:1994
Foreword
The CENELEC questionnaire procedure, performed for finding out whether or not the International Standard IEC 34-18-21:1992 could be accepted withou
22、t textual changes, has shown that no common modifications were necessary for the acceptance as a European Standard.
The reference document was submitted to the CENELEC members for formal vote and was approved by CENELEC as EN 60034-18-21
on 8 December 1993.
The following dates were fixed:
— l
23、atest date of publication of an identical national
standard (dop) 1995-03-15
— latest date of withdrawal of conflicting national
standards (dow) 1995-03-15
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For products which have complied with the relevant national standard before 1995-03-15, as shown by the manu
24、facturer or by a certification body, this previous standard may continue to apply for production until 2000-03-15.
Annexes designated “normative” are part of the body of the standard,
Annexes designated “informative” are given only for information.
In this standard, Annex A, Annex B and Annex C
25、
are informative and Annex ZA is normative.
Foreword to amendment A1
The text of amendment 1:1994 to the International Standard IEC 34-18-21:1992, prepared by SC 2J, Classification of insulation systems for rotating machinery, of IEC TC 2, Rotating machinery, was submitted to the formal vote
26、and was approved by CENELEC as amendment A1 to
EN 60034-18-21:1994 on 1996-10-01 without any modification.
The following dates were fixed:
— latest date by which the amendment has to be implemented at national level by publication of an identical national standard
or by endorsement (dop) 1997-
27、09-01
— latest date by which the national standards conflicting with the amendment have to be
2
withdrawn (dow) 1997-09-01
For products which have complied with
EN 60034-18-21:1994 before 1997-09-01, as shown by the manufacturer or by a certification body, this previous standard may continu
28、e to apply for production until 2002-09-01.
Foreword to amendment A2
The text of document 2J/51/fDIS, future amendment 2 to IEC 34-18-21:1992, prepared by SC 2J, Classification of insulation systems for rotating machinery, of IEC TC 2, Rotating machinery, was submitted to the IEC-CENELEC para
29、llel vote and was approved by CENELEC as amendment A2 to EN 60034-18-21:1994 on 1996-
10-01.
The following dates were fixed:
— latest date by which the amendment has to be implemented at national level by publication of an identical national standard
or by endorsement (dop) 1997-09-01
— la
30、test date by which the national standards conflicting with the amendment have to be
withdrawn (dow) 1997-09-01
For products which have complied with
EN 60034-18-21:1994 and its amendment A1:1996 before 1997-09-1, as shown by the manufacturer or
by a certification body, this previous standard
31、may
continue to apply for production until 2002-09-01.
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EN 60034-18-21:1994
Contents
Page
Page
8.1 General 13
8.2 Test objects 13
Foreword 2
1
Scope
5
2
Normative references
5
3
General considerations
5
Relationship to Section
32、1
5
Standard procedures
5
Reference insulation system
5
Test objects
5
Verification of diagnostic tests
6
Thermal ageing test procedure
6
Ageing temperatures and sub-cycle lengths
6
4
Procedure 1: Motorette test procedure
6
General
6
Test objects
6
Thermal ag
33、eing sub-cycle
7
Diagnostic sub-cycle
7
Analyzing, reporting and classification
8
5
Procedure 2: Motor test procedure
8
General
8
Test objects
8
Thermal ageing sub-cycle
8
Diagnostic sub-cycle
9
Analyzing, reporting and classification
10
6
Procedure 3: Test proc
34、edure for stator windings in slots
10
General
10
Test objects
10
Thermal ageing sub-cycle
10
Diagnostic sub-cycle
10
Analyzing, reporting and classification
11
7
Procedure 4: Test procedure for pole windings
11
General
11
Test objects
11
Thermal ageing sub-cy
35、cle
12
Diagnostic sub-cycle
12
Analyzing, reporting and classification
12
8
Procedure 5: Test procedure for rotor windings in slots
13
Introduction 5
8.3 Thermal ageing sub-cycle 13
8.4 Diagnostic sub-cycle 14
8.5 Analyzing, reporting and
classification 14
Annex A (informati
36、ve) Motorette
construction (example) 15
Annex B (informative) Models for windings
on poles (examples) 17
Annex C (informative) Equipment for
moisture tests 17
Annex ZA (normative) Other international publications quoted in this standard
with the references of the relevant
European publicati
37、ons 29
Figure 1 — Components of motorette
before final assembly 19
Figure 2 — Completely assembled and
varnished motorette 19
Figure 3 — Manufacturing drawing of
motorette frame 20
Figure 4 — Test fixture for random
wire-wound field coil 21
Figure 5 — Random wire-wound field coil
mounted o
38、n the test fixture 21
Figure 6 — Manufacturing drawing for simulated pole for random wire-wound field
coil test fixture 22
Figure 7 — Manufacturing drawing for simulated frame for random wire-wound
field coil test fixture 23
Figure 8 — Test fixture for precision
wire-wound field coil 24
F
39、igure 9 — Precision wire-wound
field coil mounted on the test fixture 24
Figure 10 — Manufacturing
drawing for simulated pole for precision
wire-wound field coil test fixture 25
Figure 11 — Manufacturing drawing for simulated frame for
precision wire-wound 26
Figure 12 — Diagram illustratin
40、g basic principle of condensation chamber with
cooled test objects 27
Figure 13 — Cut-away of condensation
chamber with cooled test objects 28
Table 1 — Test voltages in procedure 1 7
Table 2 — Test voltages in procedure 4 12
Table 3 — Test voltages in procedure 5 14
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4
blank
EN 60034-18-21:1994
Introduction
Section 1 of IEC 34-18 presents gener
42、al principles for the evaluation and classification of insulation systems used in rotating electrical machines.
This section of IEC 34-18 deals with the thermal evaluation and classification of insulation systems for wire-wound (usually random wound) windings.
Several standard test procedures ar
43、e given for various types of wire-wound windings and testing techniques.
This section belongs to Part 18 of a series of publications dealing with the functional evaluation of insulation systems for rotating electrical machines, the other parts being:
— Section 1: General guidelines. (IEC 34-18-1)
44、
— Section 31: Test procedures for form-wound windings. (IEC 34-18-31)
1 Scope
This section of IEC 34-18 gives test procedures for the thermal evaluation and classification of insulation systems used or proposed for use in wire-wound alternating current (a.c.) or direct
current (d.c.) rotatin
45、g electrical machines. 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 21 shall be used in conjunction with
Section 1.
2 Normative references
The following
46、standards contain provisions which, through reference in this text, constitute provisions of this section of IEC 34-18. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this section of IEC 34-18 are encouraged
47、to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 34-1:1983, Rotating electrical machines — Part 1: Rating and performance.
IEC 455, Specification for solv
48、entless polymerisable resinous compounds used for electrical insulation.
IEC 464, Specification for insulating varnishes containing solvent.
IEC 34-18-1:1991, Rotating electrical machines — Part 18: Functional evaluation of insulation systems — Section 1: General guidelines.
3 General considerat
49、ions
Relationship to Section 1
Section 1 describes general testing principles applicable to thermal endurance testing of insulation systems in rotating machines. Unless the procedures of this part indicate otherwise, the principles of Section 1 shall be followed.
Standard procedures
Five stan
50、dard procedures are specified in clauses 4 through 8. Procedure 1 can be considered of general applicability to both a.c. and d.c. applications and to both stators and armatures. However, the user of this standard may select that test procedure which most closely corresponds to the type and size o
51、f the windings to be tested and classified, taking into account facilities and past experience.
Reference insulation system
A reference insulation system shall be tested using the same test procedure as for the candidate system. See 4.2 of Section 1.
The thermal class temperatures of the two s
52、ystems shall not differ by more than 50 K.
Test objects
Construction of test objects
Tests for the selection of materials according to
of section 1 may be performed, as appropriate.
Test objects may be actual machines, machine components or models. The components and models should embody a
53、ll the essential elements.
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Insulation thickness, creepage distances and discharge protection where required shall be appropriate for the intended maximum rated voltage and equipment standards or practice. The systems compared shall have arrangements consistent with those
54、to be used in machines.
NOTE It is recognized that markedly different values of test life can be obtained for the same insulating materials, depending on insulation thicknesses and creepage distances.
Test specimens simulating parts of a coil or winding may be used for evaluation, if stresses a
55、cting on these parts in service can be reproduced reliably in the test.
Particular types of models have been used successfully in some countries and examples of these are illustrated in Annex A and Annex B.
The manufacturer should make certain that the materials proposed for use in the new insula
56、tion system can be handled without deterioration of properties in the intended manufacturing processes.
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EN 60034-18-21:1994
Quality assurance tests
To eliminate defective test objects, they should be qualified first, as per of Section 1, by visu
57、al examination and then by over-voltage tests consistent with the machine or coil tests in the manufacturing facility, or as described in the appropriate subclauses for diagnostic tests, whichever voltage test is greater.
NOTE When appropriate additional screening (or qualifying)
tests may be u
58、sed, including the following:
— insulation resistance measurement;
— loss tangent and capacitance measurement;
— partial discharge inception voltage measurement;
— balance of phase currents while running;
— repetitive surge;
— leakage current;
— high-voltage test.
Any widely deviating obj
59、ect should be discarded or inspected to determine the reason for the deviation and appropriate allowances should be made for the deviations.
Verification of diagnostic tests
A preliminary ageing test according to of Section 1, to check the feasibility of the diagnostic sub-cycle, may be perfor
60、med.
Thermal ageing test procedure
The test procedure consists of several ageing tests, performed at different ageing temperatures. At each temperature, the test life of the insulation systems tested is determined. Based on these test life values, the life at the class temperature is estimated r
61、elative to that of the reference system at its class temperature.
Each ageing test is performed in cycles, each cycle consisting of a thermal ageing sub-cycle and a diagnostic sub-cycle. The diagnostic sub-cycle may include a mechanical test, a moisture test, a voltage test and other diagnostic tes
62、ts.
Ageing temperatures and sub-cycle lengths
The considerations and procedures of of
Section 1 should be observed and followed.
For the normal procedure, the number of ageing temperatures shall be at least three.
Where the candidate insulation system represents a minor change from a class
63、ified system, of Section 1 may be followed.
Ageing temperatures and lengths of ageing subcycles should be selected from Table 2 of Section 1.
6
If the intended thermal class for the candidate insulation system differs from the known class of the reference system, different ageing temperatures
64、and sub-cycle lengths are to be selected in an appropriate manner.
The lowest ageing temperature should be selected such as to produce the log mean test life of
about 5 000 h or more. This is generally accomplished by choosing the lowest ageing temperature to correspond to an exposure period
of
65、 28 to 35 days or longer.
In addition, at least two higher ageing temperatures should be selected, separated by intervals of 20 K or more. Intervals of 10 K may be used when tests are made at more than three ageing temperatures.
To minimize the uncertainty introduced by extrapolation the lowest te
66、st temperature should not exceed by more than 25 K the temperature to which the results will be extrapolated.
4 Procedure 1: Motorette test procedure
4.1 General
Procedure 1
This procedure, using “motorette” type models as test objects, shall be referred to as IEC 34-18-21, Procedure 1.
General features
This thermal endurance test procedure consists of several cycles. Each cycle consists of:
— a thermal ageing sub-cycle;
— a diagnostic sub-cycle which includes a mechanical test,
【bs英國標(biāo)準(zhǔn)】bs en 6003418211994 rotating electrical machinesfunctional evaluation of insulation systemstest procedures for wirewound windingsthermal evaluation and classification
