1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication Electrical insulating materials and systems Electrical measurement of partial discharges (PD) under short rise time and repetitive voltage impulses DD IEC/TS 61934:2011Nationa
2、l foreword This Draft for Development is the UK implementation of IEC/TS 61934:2011. It supersedes DD IEC/TS 61934:2006 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee GEL/112, Evaluation and qualification of electrical insulating materials and system
3、s. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011 ISBN 978 0 580 71782 6 ICS 17.220.99; 29.035.01;
4、29.080.30 Compliance with a British Standard cannot confer immunity from legal obligations. This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 30 June 2011. Amendments issued since publication Amd. No. Date Text affected DRAFT FOR DEVELOPME
5、NT DD IEC/TS 61934:2011IEC/TS 61934 Edition 2.0 2011-04 TECHNICAL SPECIFICATION Electrical insulating materials and systems Electrical measurement of partial discharges (PD) under short rise time and repetitive voltage impulses INTERNATIONAL ELECTROTECHNICAL COMMISSION U ICS 17.220.99; 29.035.01; 29
6、.080.30 PRICE CODE ISBN 978-2-88912-479-4 Registered trademark of the International Electrotechnical Commission colour inside DD IEC/TS 61934:2011 2 TS 61934 IEC:2011(E) CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 2 Normative references . 7 3 Terms and definitions . 7 4 Measurement of partial
7、 discharge pulses during repetitive, short rise-time voltage impulses and comparison with power frequency . 9 4.1 Measurement frequency 9 4.2 Measurement quantities 9 4.3 Test objects. 10 4.3.1 General . 10 4.3.2 Inductive test objects . 10 4.3.3 Capacitive test objects. 10 4.3.4 Distributed impedan
8、ce test objects 10 4.4 Impulse generators 10 4.4.1 General . 10 4.4.2 Impulse waveforms 11 4.5 Effect of testing conditions 11 4.5.1 General . 11 4.5.2 Effect of environmental factors 12 4.5.3 Effect of testing conditions and ageing 12 5 PD detection methods 12 5.1 General . 12 5.2 PD pulse coupling
9、 and detection devices . 12 5.2.1 Introductory remarks 12 5.2.2 Coupling capacitor with multipole filter . 13 5.2.3 HFCT with multipole filter 14 5.2.4 Electromagnetic couplers 15 5.2.5 Charge measurements 16 5.3 Source-controlled gating techniques 17 6 Measuring instruments . 17 7 Sensitivity check
10、 of the PD measuring equipment . 17 7.1 General . 17 7.2 Test diagram for sensitivity check 18 7.3 PD detection sensitivity check . 18 7.4 Background noise check 19 7.5 Detection system noise check . 19 7.6 Sensitivity report . 19 8 Test procedure for increasing and decreasing the repetitive impulse
11、 voltage magnitude 19 9 Test report 20 Annex A (informative) Voltage impulse suppression required by the coupling device . 22 Annex B (informative) PD pulses extracted from a supply voltage impulse through filtering techniques . 24 Annex C (informative) Result of round-robin tests of RPDIV measureme
12、nt . 26 Annex D (informative) Examples of noise levels of practical PD detectors 28 DD IEC/TS 61934:2011TS 61934 IEC:2011(E) 3 Bibliography 29 Figure 1 Coupling capacitor with multipole filter . 13 Figure 2 Example of voltage impulse and PD pulse frequency spectra before and after filtering . 14 Fig
13、ure 3 HFCT between supply and test object with multipole filter 14 Figure 4 HFCT between test object and earth with multipole filter 15 Figure 5 Circuit using an electromagnetic coupler (for example an antenna) to suppress impulses from the test supply. 15 Figure 6 Circuit using an electromagnetic U
14、HF antenna . 15 Figure 7 Example of waveforms of repetitive bipolar impulse voltage and charge accumulation for a twisted-pair sample . 16 Figure 8 Charge measurements . 16 Figure 9 Example of PD detection using electronic source-controlled gating (other PD coupling devices can be used) 17 Figure 10
15、 Test diagram for sensitivity check 18 Figure 11 Example of relation between the outputs of LVPG and PD detector 19 Figure 12 Example of increasing and decreasing the impulse voltage magnitude . 20 Figure A.1 Example of overlap between voltage impulse and PD pulse spectra (dotted area) . 22 Figure A
16、.2 Example of voltage impulse and PD pulse spectra after filtering . 22 Figure A.3 Example of impulse voltage damping as a function of impulse voltage magnitude and rise time 23 Figure B.1 Power supply waveform and recorded signal using an antenna during supply voltage commutation 24 Figure B.2 Sign
17、al detected by an antenna from the record of Figure B.1, using a filtering technique (400 MHz high-pass filter) 25 Figure B.3 Characteristic of the filter used to pass from Figure B.1 to Figure B.2 25 Figure C.1 The sequence of negative voltage impulses used for RRT 26 Figure C.2 PD pulses (under) c
18、orresponding to voltage impulses (above) 26 Figure C.3 Dependence of normalized RPDIV on 100 data (NRPIV/100) on relative humidity (A-F indicates the participants of RRT) . 27 Table 1 Example of parameter values of impulse voltage waveform without load . 11 Table D.1 Examples of bandwidths and noise
19、 levels for practical PD sensors 28 DD IEC/TS 61934:2011 4 TS 61934 IEC:2011(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICAL INSULATING MATERIALS AND SYSTEMS ELECTRICAL MEASUREMENT OF PARTIAL DISCHARGES (PD) UNDER SHORT RISE TIME AND REPETITIVE VOLTAGE IMPULSES FOREWORD 1) The Internationa
20、l 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 f
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27、 access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 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
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29、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 elemen
30、ts 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. The main task of IEC technical committees is to prepare International Standards. In exceptional circumstances, a technical committee may propose the public
31、ation of a technical specification when t h e r e q u i r e d s u p p o r t c a n n o t b e o b t a i n e d f o r t h e p u b l i c a t i o n o f a n I n t e r n a t i o n a l S t a n d a r d , despite repeated efforts, or t h e s u b j e c t i s s t i l l u n d e r t e c h n i c a l d e v e l o p m
32、 e n t o r w h e r e , f o r a n y o t h e r r e a s o n , t h e r e i s t h e future but no immediate possibility of an agreement on an International Standard. Technical specifications are subject to review within three years of publication to decide whether they can be transformed into Internation
33、al Standards. IEC/TS 61934, which is a technical specification, has been prepared by IEC technical committee 112: Evaluation and qualification of electrical insulating materials and systems. This second edition cancels and replaces the first edition, published in 2006, and constitutes a technical re
34、vision. DD IEC/TS 61934:2011TS 61934 IEC:2011(E) 5 The principal changes with regard to the previous edition concern the addition of an Introduction that provides some background information on the progress being made in the field of power electronics; impulse generators; PD detection methods; a new
35、 informative Annex C covering practical experience obtained from round-robin testing (RRT); example of noise levels, as shown in new informative Annex D. The text of this technical specification is based on the following documents: Enquiry draft Report on voting 112/163/DTS 112/175/RVC Full informat
36、ion on the voting for the approval of this technical specification 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 committee has decided that the contents of this publication will remain uncha
37、nged until the stability 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 transformed into an International standard, r e c o n f i r m e d , w i t h d r a w n , r e p l a c e d b y a r e v i s e d
38、 e d i t i o n , o r a m e n d e d . IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. DD IEC/TS
39、 61934:2011 6 TS 61934 IEC:2011(E) INTRODUCTION Power electronics has developed along with both control theory and semiconductor technology. Switching is one of the essential features of power electronics control. For higher efficiency and smoother operation, switching times of the latest devices su
40、ch as insulated- gate bipolar transistor (IGBT) tend to be shorter than microseconds. Such a short rise time may cause transient overvoltage impulses or surges in the systems. When the voltage impulses reach the breakdown strength of an air gap, partial discharge (PD) may occur. In addition, the imp
41、ulses are repetitive from power electronics modulation such as pulse width modulation (PWM). Since PD may cause degradation of electrical insulation parts in the system, it is one of the most important parameters to be measured. The first edition of IEC/TS 61934 was issued in April 2006. Because of
42、rapid development in this field, the revision activity for the latest information was approved in TC112 at the Berlin meeting in September 2006. In addition to technical and editorial changes, practical experience obtained through round-robin test (RRT) is also presented in Annex C. DD IEC/TS 61934:
43、2011TS 61934 IEC:2011(E) 7 ELECTRICAL INSULATING MATERIALS AND SYSTEMS ELECTRICAL MEASUREMENT OF PARTIAL DISCHARGES (PD) UNDER SHORT RISE TIME AND REPETITIVE VOLTAGE IMPULSES 1 Scope IEC/TS 61934, which is a technical specification, is applicable to the off-line electrical measurement of partial dis
44、charges (PD) that occur in electrical insulation systems (EIS) when stressed by repetitive voltage impulses generated from electronic power devices. Typical applications are EIS belonging to apparatus driven by power electronics, such as motors, inductive reactors and windmill generators. NOTE 1 Use
45、 of this technical specification with specific products may require the application of additional procedures. NOTE 2 The procedures described in this technical specification are emerging technologies. Experience and caution, as well as certain preconditions, are needed to apply it. Excluded from the
46、 scope of this technical specification are methods based on optical or ultrasonic PD detection, fields of application for PD measurements when stressed by non-repetitive impulse voltages such as lightning impulse or switching impulses from switchgear. 2 Normative references The following referenced
47、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 60034 (all parts), Rotating electrical machines IEC 60270:2000, High-v
48、oltage test techniques Partial discharge measurements 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 repetitive voltage impulses voltage impulses which are used as test voltage for the evaluation of switching surges from power electronic dev
49、ices with a carrier or driven frequency 3.2 partial discharge PD electric discharge that only partially bridges the insulation between conductors IEC 60270:2000, 3.1, modified DD IEC/TS 61934:2011 8 TS 61934 IEC:2011(E) 3.3 partial discharge pulse current pulse in an object under test that results from a partial discharge occurring within the object under test NOTE 1 The pulse is measured using suitable detector circuits, which have been int
