This technical guidance document gives some basic principles for determining the connection of large fluctuating loads (generating flicker) to the public power system. GB/Z 17625.5-2000 Electromagnetic compatibility limits Evaluation of emission limits of fluctuating loads in medium and high voltage power systems GB/Z17625.5-2000 Standard download decompression password: www.bzxz.net

GB/Z 17625.5—2000
This guidance technical document is equivalent to the international standard IEC61000-3-7:1996 "Electromagnetic compatibility Part 3: Limits Part 7: Evaluation of emission limits of fluctuating loads in medium and high voltage power systems". This guidance technical document recommends the evaluation method of emission limits of fluctuating 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 for limiting voltage fluctuations and flickers generated in low-voltage power supply systems by equipment with rated current not exceeding 16A
GB/Z17625.3-2000
Electromagnetic compatibility limits for limiting voltage fluctuations and flickers generated in low-voltage power supply systems by equipment with rated current greater than 16A
GB/Z17625.4—2000
Evaluation of emission limits of distortion loads in medium- and high-voltage power systems under electromagnetic compatibility limits Evaluation of emission limits of fluctuating loads in medium- and high-voltage power systems under electromagnetic compatibility limits GB/Z17625.5—2000
This guiding technical document is for reference only. Suggestions and comments on this guidance technical document should be reported to the standardization administrative department of the State Council.
Appendix A, Appendix B, Appendix C, Appendix D and Appendix E 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 Standardization Joint Working Group. The responsible drafting units of this guidance technical document are: Wuhan High Voltage Research Institute of the State Power Corporation, Guangzhou Electric Power Industry Bureau. The main drafters of this guidance technical document are: Zhang Wenliang, Xu Daming, Nie Dingzhen, Wan Baoquan, Jiang Hong. 146
GB/Z17625.5-2000
IEC Foreword
1) The International Electrotechnical Commission (IEC) is a worldwide standardization organization 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. To this end, in addition to carrying out other activities, it also publishes international standards, which are commissioned to be formulated by technical committees. Any IEC National Committee interested in the formulation project may participate. International organizations, governmental and non-governmental organizations in liaison with the IEC may also participate in this work. The IEC and the International Organization for Standardization (ISO) work closely together under conditions agreed upon by the two organizations. 2) Since each technical committee has representatives from all countries interested in the relevant development project, the formal decisions or agreements made by the 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 consistency, IEC national committees should convert IEC international standards into their national and regional standards as much as possible, and 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 compliance with standards, nor does it assume responsibility for any equipment that claims to comply with a certain standard. The main task of the IEC technical committee is to develop international standards. In special circumstances, the technical committee may publish a technical report of one of the following types.
· 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 cannot be agreed upon as an International Standard at a later date for any other reason;
· Type 3, when the technical committee collects various information, 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. IEC61000-3-7 is a Type 3 technical report and was prepared by the following committee: IEC Technical Committee 77 (Electromagnetic Compatibility) Subcommittee 77A (Low-frequency Phenomena). This technical report is Part 3, Subpart 7 of IEC61000 and has the status of a basic EMC publication in accordance with IEC Guide 107.
This standard text is based on the documents in the table below: Committee Draft
77A/136/CDV
Voting Report
77A/154/RCV
Full information on the voting for this technical report can be found in the voting report in the table above. Annex A, Annex B, Annex C, Annex D and Annex E are for reference only. 147
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IEC Introduction
This standard is part of the IEC61000 series of standards, which consists of the following: Part 1: General
General considerations (overview, basic principles)
Definitions, terms
Part 2: Environment
Description of environment
Classification of environment
Compatibility level
Part 3: Limits
Emission limits
Immunity limits (as they are not within 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. 148
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National Standardization Guiding Technical Document of the People's Republic of China Electromagnetic compatibility-Limits-Assessment of emission limits for fluctuating loads in MV and HV power systemsGB/Z 17625. 5-2000bzxz.net
idt IEC 61000-3-7:1996
This guiding technical document gives some basic principles for deciding whether to connect large fluctuating loads (generating internal flicker) 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. Because the guidance given 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 flicker problems. The recommended approach should be used flexibly and the actual project situation should determine when to adopt the given assessment procedure in whole or in part. The question of whether equipment that generates fluctuations can be connected to the power system is ultimately determined by the power supply company. Problems related to voltage fluctuations can be divided into two basic types: flicker effects from light sources;
the voltage amplitude is in danger of exceeding the acceptable tolerance range. This technical guidance document focuses mainly on controlling or limiting flicker, but there is also a chapter on changes in voltage amplitude and their effects. Note
Regarding system voltage, this technical guidance document uses the following terms: 1
Low voltage (LV) refers to UN≤1kV;
Medium voltage (MV) refers to 1kV
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