This technical guidance document proposes some basic principles for determining the connection of large distortion loads (generating harmonics and/or interharmonics) to the public power system. GB/Z 17625.4-2000 Electromagnetic compatibility limits Evaluation of emission limits of distortion loads in medium and high voltage power systems GB/Z17625.4-2000 standard download decompression password: www.bzxz.net

GB/Z 17625. 4-2000
This guiding technical document is equivalent to the international standard IEC61000-3-6:1996 "Electromagnetic compatibility Part 3: Limits Part 6: Evaluation of emission limits of distorted loads in medium and high voltage power systems". This guiding technical document recommends the evaluation method of emission limits of distorted loads in medium and high voltage power systems.
This guiding technical document is one of the national standards in the "Electromagnetic Compatibility Limits" series, which currently includes the following standards: GB17625.1--1998 Limits of harmonic currents emitted by low-voltage electrical and electronic equipment (equipment input current per phase ≤16A) GB17625.2—1999 Electromagnetic compatibility limits Limits on voltage fluctuations and flickers generated by equipment with a rated current not exceeding 16A in a low-voltage power supply system
GB/Z17625.3--2000 Electromagnetic compatibility limits Limitation of voltage fluctuation and flicker generated by equipment with rated current greater than 16A in low-voltage power supply systems
GB/Z17625.4~-2000. Evaluation of emission limits of distorted loads in medium- and high-voltage power systems GB/Z17625.5--2000 Evaluation of emission limits of fluctuating loads in medium- and high-voltage power systems This guidance technical document is for reference only. Suggestions and opinions on this guidance technical document should be reported to the administrative department of standardization of the State Council.
Appendix A, Appendix B, Appendix C, Appendix D, Appendix E, Appendix G and Appendix H of this guidance technical document are informative appendices. This guidance technical document is proposed by the State Power Corporation. This guidance technical document is under the jurisdiction of the National Electromagnetic Compatibility Standard Promotion Joint Working Group. The responsible drafting units of this guidance technical document are: Wuhan High Voltage Research Institute of the State Power Corporation and Guangzhou Electric Power Industry Bureau. The main drafters of this guidance technical document are: Lang Weichuan, Xu Daming, Guo Xiong, Ding Zhen, Jiang Hong and Gong Zeng. 101
GB/Z 17625.4—2000
IEC Foreword
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization composed of the National Electrotechnical Commissions (IEC National Committees) of all participating countries. Its purpose is to promote international consensus on all issues related to standardization in the field of electrical and electronic technology. For the approval of the International Electrotechnical Commission, in addition to other activities, it also publishes international standards, which are entrusted to technical committees for formulation. Any IEC National Committee interested in the formulation project may participate. International organizations, governmental and non-governmental organizations that have liaison with IEC may also participate in this work. IEC and the International Organization for Standardization (ISO) work closely together under the conditions determined by negotiation between the two organizations. 2) Since the technical committees have representatives from all countries interested in the relevant formulation project, the formal decisions or agreements made by IEC on the relevant technical content express international consensus as much as possible. 3) The resulting documents may be published in the form of standards, technical reports or guidelines, and are recommended for international use and accepted by the National Committees in this sense.
4) In order to promote international uniformity, IEC National Committees should, as far as possible, convert IEC International Standards into their national and regional standards. Any differences between the corresponding national or regional standards and IEC International Standards should be clearly stated in the standards. 5) IEC does not take a position on disputes over conformity or non-conformity, nor does it assume responsibility for any equipment claiming to conform to a certain standard. The main task of IEC Technical Committees is to develop International Standards. In special cases, Technical Committees may publish one of the following types of technical reports.
Type 1, when publication as an International Standard is not possible despite repeated efforts, Type 2, when the subject is still in the technical development stage, or for any other reason it cannot be agreed to be an International Standard in the future:
, Type 3, when the Technical Committee collects various materials, such as "scientific developments", in the routine process of publishing International Standards. Type 1 and Type 2 technical reports are reviewed within three years from the time of publication to determine whether they can become International Standards. Type 3 technical reports do not need to be reviewed until the information they provide is considered no longer valid or useful. IEC61000-3-6 is a Category 3 Technical Report, developed by IEC Technical Committee 77 (Electromagnetic Compatibility), Subcommittee 77A (Low-frequency Phenomena). This Technical Report is Part 3, Subpart 6 of IEC61000 and has the status of a basic EMC publication in accordance with IEC Guide 107.
The text of this standard is based on the documents in the table below: Committee DraftwwW.bzxz.Net
77A/136/CDV
Voting Report
77A/154/RCV
Full information on the vote to approve this Technical Report can be found in the voting report in the table above. Annexes A, B, C, D, E, G and H are for reference only. 102
GB/Z 17625. 4-2000
IEC Introduction
This standard is part of the IEC61000 series of standards, which consists of the following: Part 1 General considerations (overview, basic principles)
Definitions, terminology
Part 2: Environment
Description of environment
Classification of environment
Compatibility level
Part 3: Limits
Emission limits
Immunity limits (because they are outside the responsibility of the product committee) Part 4: Test and measurement techniques
Measurement techniques
Test techniques
Part 5: Installation and mitigation guidelines
Installation guidelines
Mitigation methods and devices
Part 6: Generic standards
Part 9: Others
Each part is divided into several subparts, which are published as International Standards or Technical Reports. 103
1 Scope
National Standardization Guiding Technical Document of the People's Republic of China Electromagnetic compatibility
Electromagnetic compatihility-Limits--Assessment of emission limits for distorting loads in MV and HV power systemsGB/Z 17625. 4--2000
idt 1EC 61000-3-6:1996
This guiding technical document proposes some basic principles to be used as the basis for deciding whether to connect large distorting loads (generating harmonics and/or interharmonics) to the public power system. Its main purpose is to provide guidance for engineering practice to ensure that the power supply quality is appropriate for all users connected to the system. Since the guidelines proposed in this guiding technical document must be based on certain assumptions, there is no guarantee that these methods will always provide the best solution to all harmonic problems. The recommended methods should be used flexibly, and the actual situation of the project should be used to decide when to adopt the given evaluation procedures in whole or in part. The issue of whether the equipment that generates harmonics can be connected to the power system is ultimately decided by the power supply company. The problems related to harmonics are divided into two basic types: one is the injection of harmonic currents into the power supply network by converters or other harmonic sources. Harmonic currents and the voltages caused by them can be considered as conducted phenomena. The purpose of this standard is to limit the actual harmonic voltages in the power supply network to a level (compatibility level) that does not cause harmful effects on sensitive equipment. Since harmonic voltages are caused by harmonic currents and impedances, the harmonic currents injected into the system must be limited. Harmonic currents in the range of 50 Hz to 5 kHz may introduce interference into the communication system. This phenomenon is more significant due to the increased coupling between circuits at higher harmonic frequencies and the higher sensitivity of communication circuits in the audio range. The focus of this guidance technical document is mainly on controlling or limiting harmonic voltages and their effects, but there is also a chapter on interference with communications. Note
1 Load is understood as the entire user's equipment. 2 About system voltage This guidance document uses the following terms: Low voltage (LV) refers to U≤1kV
- Medium voltage (MV) refers to 1kV
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