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1、 Approved as an American National Standard (ANSI)IEEE Std 242-2001(Revision of IEEE Std 242-1986)IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power SystemsSponsorIndustrial an
2、d Commercial Power Systems Departmentof theIEEE Industry Applications SocietyApproved 14 June 2001IEEE-SA Standards BoardAbstract: The principles of system protection and the proper selection, application, and coordinati
3、on of components that may be required to protect industrial and commercial power systems against abnormalities that could reasonably be expected to occur in the course of system operation are presented in a in a simple,
4、yet comprehensive, format. The principles presented apply to both new electrical system design and to the changing, upgrading, or expansion of an existing electrical distribution system.Keywords:bus protection, cable pro
5、tection, calibration, conductor protection, coordinating time intervals, current transformers, current-limiting fuses, fuse coordination, fuse selectivity, generator grounding, generator protection, high-voltage fuses, l
6、iquid preservation systems, low-voltage motor protection, medium-voltage motor protection, motor protection, overcurrent protection, potential transformers, power fuses, protective relays, relay application principles, r
7、elay operating principles, service protection, short-circuit protection, switchgear protection, system design, system protection, transformer protection, voltage transformersIEEE Standardsdocuments are developed within t
8、he IEEE Societies and the Standards Coordinating Committees of the IEEE Standards Association (IEEE-SA) Standards Board. The IEEE develops its stan- dards through a consensus development process, approved by the American
9、 National Standards Institute, which brings together volunteers representing varied viewpoints and interests to achieve the final product. Volunteers are not necessarily members of the Institute and serve without compens
10、ation. While the IEEE administers the process and establishes rules to promote fairness in the consensus development process, the IEEE does not independently evaluate, test, or verify the accuracy of any of the informati
11、on contained in its standards.Use of an IEEE Standard is wholly voluntary. The IEEE disclaims liability for any personal injury, prop- erty or other damage, of any nature whatsoever, whether special, indirect, consequent
12、ial, or compensatory, directly or indirectly resulting from the publication, use of, or reliance upon this, or any other IEEE Stan- dard document.The IEEE does not warrant or represent the accuracy or content of the mate
13、rial contained herein, and expressly disclaims any express or implied warranty, including any implied warranty of merchantability or fitness for a specific purpose, or that the use of the material contained herein is fre
14、e from patent infringe- ment. IEEE Standards documents are supplied “AS IS.”The existence of an IEEE Standard does not imply that there are no other ways to produce, test, measure, purchase, market, or provide other good
15、s and services related to the scope of the IEEE Standard. Further- more, the viewpoint expressed at the time a standard is approved and issued is subject to change brought about through developments in the state of the a
16、rt and comments received from users of the standard. Every IEEE Standard is subjected to review at least every five years for revision or reaffirmation. When a document is more than five years old and has not been reaffi
17、rmed, it is reasonable to conclude that its con- tents, although still of some value, do not wholly reflect the present state of the art. Users are cautioned to check to determine that they have the latest edition of any
18、 IEEE Standard.In publishing and making this document available, the IEEE is not suggesting or rendering professional or other services for, or on behalf of, any person or entity. Nor is the IEEE undertaking to perform a
19、ny duty owed by any other person or entity to another. Any person utilizing this, and any other IEEE Standards document, should rely upon the advice of a competent professional in determining the exercise of reason- able
20、 care in any given circumstances.Interpretations: Occasionally questions may arise regarding the meaning of portions of standards as they relate to specific applications. When the need for interpretations is brought to t
21、he attention of IEEE, the Institute will initiate action to prepare appropriate responses. Since IEEE Standards represent a consensus of concerned interests, it is important to ensure that any interpretation has also rec
22、eived the concurrence of a balance of interests. For this reason, IEEE and the members of its societies and Standards Coordinating Committees are not able to provide an instant response to interpretation requests except
23、in those cases where the matter has previously received formal consideration. Comments for revision of IEEE Standards are welcome from any interested party, regardless of member- ship affiliation with IEEE. Suggestions f
24、or changes in documents should be in the form of a proposed change of text, together with appropriate supporting comments. Comments on standards and requests for interpretations should be addressed to:Secretary, IEEE-SA
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