1、 IEC TS 62749 Edition 1.0 2015-04 TECHNICAL SPECIFICATION Assessment of power quality Characteristics of electricity supplied by public networks IEC TS 62749:2015-04(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC, Geneva, Switzerland All rights reserved. Unless otherwis
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11、orks INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 17.220.99 ISBN 978-2-8322-2547-9 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 IEC TS 62749:2015 IEC 2015 CONTENTS FOREWORD
12、 . 4 INTRODUCTION . 6 1 Scope 7 2 Normative references 8 3 Terms and definitions 9 4 Recommended values for power quality indices . 16 4.1 General . 16 4.2 Frequency deviation 16 4.3 Supply voltage deviation . 16 4.3.1 General . 16 4.3.2 Low voltage systems . 16 4.3.3 Medium voltage systems 17 4.3.4
13、 High voltage systems . 17 4.4 Voltage unbalance 18 4.5 Flicker. 18 4.6 Harmonic and interharmonic voltage . 18 4.6.1 General . 18 4.6.2 Low voltage systems . 18 4.6.3 Medium voltage systems 19 4.6.4 High voltage systems . 20 4.7 Voltage dip . 21 4.8 Voltage swell 22 4.9 Voltage interruption. 22 4.1
14、0 Mains signalling voltage 22 4.11 Rapid voltage change . 23 4.12 Transient overvoltage . 23 4.12.1 Low voltage systems . 23 4.12.2 Medium and High voltage systems . 24 5 Objectives and methods for power quality assessment 24 5.1 General . 24 5.2 Site power quality assessment 24 5.2.1 General . 24 5
15、.2.2 For continuous phenomena 25 5.2.3 For discontinuous phenomena (single event) . 26 5.3 System aspect power quality assessment . 27 5.3.1 General . 27 5.3.2 For continuous phenomena 27 5.3.3 For discontinuous phenomena (events) . 27 Annex A (informative) Examples of PROFILES for Power Quality Spe
16、cification 30 A.1 LV public distribution in European countries 30 A.2 LV, MV and HV power supply system in China 31 A.3 Example of a transmission system in Canada . 32 A.4 Examples of Profiles in Australia . 33 Annex B (informative) Example on System Aspect Continuous Disturbance Evaluation 34 Annex
17、 C (informative） Main Impact of Poor Power Quality. 35 IEC TS 62749:2015 IEC 2015 3 C.1 Harmonic distortion . 35 C.2 Voltage unbalance 35 C.3 Voltage deviation 36 C.4 Frequency deviation 36 C.5 Voltage fluctuation 36 C.6 Flicker. 36 C.7 Voltage dip (or Voltage sag) 36 C.8 Transient overvoltages 36 A
18、nnex D (informative) Power Quality Issues Related to Distributed Generation and Micro-grids 37 D.1 Voltage deviation 37 D.2 Harmonics 37 D.3 DG magnetic bias (DC current injection) . 37 D.4 Voltage fluctuation and flicker . 37 D.5 High frequency conducted disturbances 38 Annex E (informative) Method
19、s to Maintain and Improve Power Quality . 39 E.1 Voltage deviation 39 E.2 Harmonics 39 E.3 Flicker. 40 E.4 Unbalance 40 E.5 Voltage dip/swell/short time interruption . 40 Annex F (informative) Relation between Power quality and EMC . 41 Bibliography 43 Figure 1 Signal voltages recommended values in
20、percent of U Nused in public LV networks (or U cin public MV networks) 23 Figure 2 An example for illustrating voltage THD assessment result trends 26 Figure 3 An example showing information of single event assessment . 27 Figure F.1 Application points in a LV system (example) . 42 Figure F.2 Relati
21、on between disturbance levels (Schematic significance only) . 42 Table 1 Classification of electromagnetic phenomena addressed by power quality indices 8 Table 2 Flicker severity P ltrecommended values . 18 Table 3 Recommended values of individual harmonic voltages at the low voltage supply terminal
22、s for orders up to 50 given in percent of the fundamental voltage U 1. 19 Table 4 Recommended values of individual harmonic voltages at the medium voltage supply terminals for orders up to 50 given in percent of the fundamental voltage U 1. 20 Table 5 Indicative values of individual harmonic voltage
23、s at the high voltage supply terminals given in percent of the fundamental voltage U 1. 21 Table 6 Site power quality assessment methods 25 Table 7 Example of single event assessment . 27 Table 8 List of individual events measured at a single monitoring site 28 Table 9 SARFI-X indices coming out of
24、Table 8 . 28 Table 10 Magnitude duration table format . 29 Table B.1 Listing of System Power Quality Evaluation . 34 4 IEC TS 62749:2015 IEC 2015 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ASSESSMENT OF POWER QUALITY CHARACTERISTICS OF ELECTRICITY SUPPLIED BY PUBLIC NETWORKS FOREWORD 1) The Interna
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37、agreement on an International Standard. Technical specifications are subject to review within three years of publication to decide whether they can be transformed into International Standards. IEC TS 62749, which is a technical specification, has been prepared by IEC technical committee 8: System as
38、pects of electrical energy supply. IEC TS 62749:2015 IEC 2015 5 The text of this technical specification is based on the following documents: DTS Report on voting 8/1363/DTS 8/1381/RVC Full information on the voting for the approval of this technical specification can be found in the report on votin
39、g 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 unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in
40、the data related to the specific publication. At this date, the publication will be transformed into an International standard, reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. IMPORTANT The colour inside logo o
41、n 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. 6 IEC TS 62749:2015 IEC 2015 INTRODUCTION The description of ELECTRICITY is of f
42、undamental importance within electricity supply systems. In general, its characteristics depend less on its generation than on the way in which it is transported by networks and being used by the equipment of the multiple users. Faults or other events such as short-circuit and lightning strikes occu
43、rring within users installations or public networks also disturb or degrade it. There is a need for a common set of power quality indices and measurement methods in order to allow different system operators to measure and report power quality in a consistent manner. Regarding the limits or levels of
44、 power quality, the situation differs. Historically, the electrical systems in different countries/regions have been designed in different ways to cater for national/regional variations like different geographic, climatic or commercial conditions, etc. It is thus essential that any set of internatio
45、nally agreed power quality limits or levels also recognize these differences which depends namely on the system configuration, the transfer characteristics between the different voltage levels (attenuation or amplification), the actual disturbance levels on the system, etc. Also, the level of power
46、quality is not absolute rather it depends on the price that clients are willing to pay for it. Optimizing power quality should be carried out in a cost-effective manner in that if NETWORK USERs expect power quality to be an intrinsic characteristic of the product they also want it at the lowest pric
47、e. This is why some of the objectives recommended hereafter allow for a range of values, or options, while still ensuring the coordination of disturbance levels between different parts of the system or voltage levels. Then, the requirements to be applied can be expressed by the association of the IE
48、C Power Quality framework from the normative part of this Technical Specification and PROFILES. Examples of profiles are given in Annex A. Nowadays, Smart Grid construction and massive deployment of renewable energy sources increase the complexity of power quality management. IEC TS 62749:2015 IEC 2
49、015 7 ASSESSMENT OF POWER QUALITY CHARACTERISTICS OF ELECTRICITY SUPPLIED BY PUBLIC NETWORKS 1 Scope This Technical Specification specifies the expected characteristics of electricity at the SUPPLY TERMINALS of public low, medium and high voltage, 50 Hz or 60 Hz, networks. NOTE 1 The boundaries between the various voltage levels may be different for different countries/regions. In the context of this TS, the following terms for system voltage are used: low voltage (LV) r
