1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationRotating electrical machinesPart 27: Off-line partial discharge measurements on the stator winding insulation of rotating electrical machinesDD CLC/TS 60034-27:2011National forew
2、ordThis Draft for Development is the UK implementation of CLC/TS 60034-27:2011.The UK participation in its preparation was entrusted to Technical Committee PEL/2, Rotating electrical machinery.A list of organizations represented on this committee can be obtained on request to its secretary.This publ
3、ication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011ISBN 978 0 580 73947 7 ICS 29.160.99Compliance with a British Standard cannot confer immunity from legal obligations.This Draft for Development was published und
4、er the authority of the Standards Policy and Strategy Committee on 31 August 2011.Amendments issued since publicationAmd. No. Date Text affectedDRAFT FOR DEVELOPMENTDD CLC/TS 60034-27:2011TECHNICAL SPECIFICATION CLC/TS 60034-27 SPCIFICATION TECHNIQUE TECHNISCHE SPEZIFIKATION February 2011 CENELEC Eu
5、ropean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for
6、CENELEC members. Ref. No. CLC/TS 60034-27:2011 E ICS 29.160 English version Rotating electrical machines - Part 27: Off-line partial discharge measurements on the stator winding insulation of rotating electrical machines (IEC/TS 60034-27:2006) Machines lectriques tournantes - Partie 27: Mesures larr
7、t des dcharges partielles effectues sur le systme disolation des enroulements statoriques des machines lectriques tournantes (CEI/TS 60034-27:2006) Drehende elektrische Maschinen - Teil 27: Off-line-Teilentladungsmessungen an der Statorwicklungsisolation drehender Maschinen (IEC/TS 60034-27:2006) Th
8、is Technical Specification was approved by CENELEC on 2011-01-25. CENELEC members are required to announce the existence of this TS in the same way as for an EN and to make the TS available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in
9、 force. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portug
10、al, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DD CLC/TS 60034-27:2011CLC/TS 60034-27:2011 Foreword The text of the Technical Specification IEC/TS 60034-27:2007, prepared by IEC TC 2, Rotating machinery, was submitted to the formal vote and was approved by CENELE
11、C as CLC/TS 60034-27 on 2011-01-25. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. The following date was fixed: latest date by which th
12、e existence of the CLC/TS has to be announced at national level (doa) 2011-07-25 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the Technical Specification IEC/TS 60034-27:2006 was approved by CENELEC as a Technical Specification without any modification. DD CLC/TS 60034-27:201
13、1CLC/TS 60034-27:2011 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 re
14、ferences, 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 IEC 60060-1 - High-voltage test techniques -
15、 Part 1: General definitions and test requirements EN 60060-1 - IEC 60060-2 - High-voltage test techniques - Part 2: Measuring systems EN 60060-2 - IEC 60270 2000 High-voltage test techniques - Partial discharge measurements EN 60270 2001 DD CLC/TS 60034-27:2011TS 60034-27 IEC:2006 CONTENTS INTRODUC
16、TION. 11 1 Scope. .15 2 Normative references . 15 3 Terms and definitions . 15 4 Nature of PD in rotating machines . .19 4.1 Basics of PD 19 4.2 Types of PD in rotating machines .21 4.3 Pulse propagation in windings .23 5 Measuring techniques and instruments. .25 5.1 General .25 5.2 Influence of fre
17、quency response of measurement system . .25 5.3 Effects of PD coupling units. 27 5.4 Wide-band and narrow band measuring systems .29 6 Visualization of measurements 33 6.1 General .33 6.2 Minimum scope of PD data presentation33 6.3 Additional means of PD data representation .35 7 Test circuits. .39
18、7.1 General .39 7.2 Individual winding components 39 7.3 Complete winding. .43 8 Normalization of measurements . 47 8.1 General .47 8.2 Individual winding components 49 8.3 Complete windings 49 9 Test procedures . .53 9.1 Acquiring PD measurements on windings and winding components. 53 9.2 Identifyi
19、ng and locating the source of partial discharges .61 10 Interpretation of test results . 63 10.1 General .63 10.2 Interpretation of PDIV, PDEV and Qm . .65 10.3 PD pattern recognition. .69 11 Test report.73 Annex A (informative) On-line partial discharge measurements. 79 Annex B (informative) Non-el
20、ectrical methods of PD detection and methods for localization . .83 Annex C (informative) External noise, disturbance and sensitivity.85 Annex D (informative) Methods of disturbance suppression .91 Annex E (informative) Interpretation of PD magnitude data and phase resolved PD patterns . 103 DD CLC/
21、TS 60034-27:2011TS 60034-27 IEC:2006 Bibliography. . 111 Figure 1 Frequency response of a PD pulse and coupling units of various time constants 27 Figure 2 Typical pulse responses of wide band and narrow band PD systems31 Figure 3 PD magnitude as a function of the normalized test voltage Qm=f(U/Umax
22、) . .35 Figure 4 Example of a -q-n partial discharge pattern where the PD was measured in series with the test object in accordance with Figure 5b, with colour code for the pulse number H(n) .37 Figure 5 Basic test circuits in accordance with IEC 60270. .41 Figure 6 Test circuit for PD measurement (
23、S1.1) on complete winding .43 Figure 7 Normalization of the test circuit for measurement S1.151 Figure 8 Test voltage applied to the test object during PD measurement . .57 Figure 9 Example for identification and localization of PD sources . 71 Figure C.1 Recharging of the test object by various cur
24、rent components. 87 Figure D.1 Without window masking. 91 Figure D.2 With window masking 91 Figure D.3 Pulse currents through the measuring circuit . .93 Figure D.4 Example of noise rejection99 Figure D.5 Example of cross-talk rejection . 101 Figure E.1 Example PD patterns . . 105 Table 1 Connection
25、 diagram S1 for open star point. 45 Table 2 Connection diagram S2 for closed star point 45 Table 3 Connection diagram E1 for open star point. 47 Table 4 Connection diagram E2 for closed star point 47 Table E.1 Risks associated with the main PD sources in rotating machines . 107 DD CLC/TS 60034-27:20
26、11TS 60034-27 IEC:2006 11 INTRODUCTION For many years, the measurement of partial discharges (PD) has been employed as a sensi-tive means of assessing the quality of new insulation as well as a means of detecting local-ized sources of PD in used electrical winding insulation arising from operational
27、 stresses in service. Compared with other dielectric tests (i.e. the measurement of dissipation factor or insulation resistance) the differentiating character of partial discharge measurements allows localized weak points of the insulation system to be identified. The PD testing of rotating machines
28、 is also used when inspecting the quality of new assem-bled and finished stator windings, new winding components (e.g. form-wound coils and bars, HV bushings, etc.) and fully impregnated stators. In connection with the servicing and overhaul of rotating machines, the measurement of par-tial discharg
29、es can also provide information on: points of weakness in the insulation system; ageing processes; further measures and intervals between overhauls. Although the PD testing of rotating machines has gained widespread acceptance, it has emerged from several studies that not only are there many differe
30、nt methods of measurement in existence but also the criteria and methods of analysing and finally assessing the measured data are often very different and not really comparable. Consequently, there is an urgent need to give some guidance to those users who are considering the use of PD measurements
31、to assess the condition of their insulation systems. Partial discharge testing of stator windings can be divided into two broad groups: a) off-line measurements, in which the stator winding is isolated from the power system and a separate power supply is employed to energize the winding; b) on-line
32、measurements, in which the rotating machine is operating normally and connected to the power system. Both of these approaches have advantages and disadvantages with respect to one another. A brief discussion of the merits of on-line testing, as well as the drawbacks, is provided in Annex A. However,
33、 while acknowledging the extensive world-wide use of on-line methods and their proven value to industry, this technical specification is confined to off-line techniques. This approach is considered necessary to render this specification sufficiently concise to be of use by non-specialists in the fie
34、ld of PD testing. DD CLC/TS 60034-27:2011TS 60034-27 IEC:2006 13 Limitations: When stator windings are being tested different types of PD measuring instruments will inevi-tably produce different results and consequently PD measurements will only be comparable under certain conditions. Therefore, abs
35、olute limits for the windings of rotating machines, for example as acceptance criteria for production or operation, are difficult to define. This is mainly due to pulse propagation phenomena, specific difficulties with calibration and the indi-vidual frequency response characteristics of stator wind
36、ings and PD measuring systems. In addition, the degree of deterioration, and hence the risk of insulation system failure, de-pends on the specific type of PD source and its location within the stator winding insulation, both of which can influence the test results very significantly. Empirical limit
37、s verified in practice can be used as a basis for evaluating test results. Fur-thermore, PD trend evaluation and comparisons with machines of similar design and similar insulation system measured under similar conditions, using the same measurement equip-ment, are recommended to ensure reliable asse
38、ssment of the condition of the stator winding insulation. Users of PD measurement should be aware that, due to the principles of the method, not all insulation-related problems in stator windings can be detected by measuring partial dis-charges (e.g. insulation failures involving continuous leakage
39、currents due to conductive paths between different elements of the insulation or pulseless discharge phenomena). For testing individual winding components, the limitations due to pulse propagation phenom-ena need not be considered when interpreting the results of measurements. DD CLC/TS 60034-27:201
40、1TS 60034-27 IEC:2006 15 ROTATING ELECTRICAL MACHINES Part 27: Off-line partial discharge measurements on the stator winding insulation of rotating electrical machines 1 Scope This part of IEC 60034 which is a technical specification provides a common basis for measuring techniques and instruments,
41、the arrangement of test circuits, normalization and testing procedures, noise reduction, the documentation of test results, the interpretation of test results with respect to partial discharge off-line measurements on the stator winding insulation of rotating electrical machines when tested with alt
42、ernating voltages up to 400 Hz. This technical specification applies to rotating machines having bars or form wound coils with conductive slot coating. This is usually valid for machines with voltage rating of 6 kV and higher. The measurement methods described in this specification may also be appli
43、ed to machines with-out conductive slot coating. However, results may be different and are not covered by this specification. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For un
44、dated references, the latest edition of the referenced document (including any amendments) applies. IEC 60060-1, High-voltage test techniques Part 1: General definitions and test requirements IEC 60060-2, High-voltage test techniques Part 2: Measuring systems IEC 60270:2000, High-voltage test techni
45、ques Partial discharge measurements 3 Terms and definitions For the purposes of this document, the general terms and definitions for partial discharge measurements given in IEC 60270 apply, together with the following. 3.1 off-line measurement measurement taken with the rotating machine at standstil
46、l, the machine being disconnected from the power system NOTE The necessary test voltage is applied to the winding from a separate voltage source. DD CLC/TS 60034-27:2011TS 60034-27 IEC:2006 17 3.2 on-line measurement measurement taken with the rotating machine in normal operation 3.3 stress control
47、coating paint or tape on the surface of the groundwall insulation that extends beyond the conductive slot portion coating in high-voltage stator bars and coils NOTE The stress control coating reduces the electric field stress along the winding overhang to below a critical value that would initiate P
48、D on the surface. The stress control coating overlaps the conductive slot portion coating to provide electrical contact between them. 3.4 conductive slot coating conductive paint or tape layer in intimate contact with the groundwall insulation in the slot portion of the coil side, often called semic
49、onductive coating NOTE This coating provides good electrical contact to the stator core. 3.5 resistance temperature detector RTD a temperature detector inserted into the stator winding, usually between the top and bottom bar or embedded coil sides in a given slot 3.6 slot discharges discharges that occur between the outer surface of the slot portion of a coil or bar and the grounded core laminations 3.7 internal discharges discharges that occur withi
