IEEE-C62.21-2003.pdf
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1、IEEE Std C62.21“-2003 Errata to IEEE Guide for the Application of Surge Voltage Protective Equipment on AC Rotating Machinery I000 V and Greater Sponsor Surge Protective Devices Committee of the IEEE Power Engineering Society Correction Sheet Issued 22 March 2006 Copyright O 2006 by the Institute of
2、 Electrical and Electronics Engineers, Inc. All rights reserved. Published 2006. Printed in the United States of America. This correction sheet may be freely reproduced and distributed in order to maintain the utility and currency of the underlying Standard. This correction sheet may not be sold, li
3、censed or otherwise distributed for any commercial purposes whatsoever. The content of this correction sheet may not be modified. 22 March 2006 SH95200 Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=NASA Technical Standards 1/997
4、2545001 Not for Resale, 04/25/2007 02:53:06 MDTNo reproduction or networking permitted without license from IHS -,-,- Page 4, Clause 3 Defiitions, change the Note to read as follows: NOTE-The following definitions are purposely not alphabetized. Rather, the terms are arranged in such a way as to fac
5、ilitate an understanding of the technical relationship between them. The terms proceed in order of technical dependency. Page 33, the paragraph below Equation (9) should read as follows: The attenuation factor a, is due to conductor skin effect, a d dielectric loss and a, semi-conductive layer loss.
6、 These losses are evaluated at 1 MHz in units of dB per meter as follows, and are then multiplied by the cable length, meters. Estimate skin effect loss a, at this frequency using Equation (A. 1 O). Page 33, the first paragraph below Equation (10) should read as follows: Where K, is a conductor mate
7、rial parameter and w is the surface width (mm) over which current flows B22. Values of K, for common materials are 1.1 for copper, 1.5 for aluminum, 3.9 for lead, and 30 for steel (assuming a relative permeability of 100). For unshielded cables consider only one phase conductor since Z, in Equation
8、(A. 1 O) is per phase. For shielded cables, the attenuation should be taken as the sum of losses in one phase conductor and its shield. Page 33, the third paragraph below Equation (10) should read as follows: For EPR or XLPE cables with semi-conductive layers, an additional semi-conductive loss effe
9、ct, a, is about 0.2 x 10- +1 978 750 8400. Permission to photocopy portions of any individual standard for educational classroom use can also be obtained through the Copyright Clearance Center. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with I
10、EEELicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:53:06 MDTNo reproduction or networking permitted without license from IHS -,-,- Introduction (This introduction is not part of IEEE Std C62.21-2003, IEEE Guide for the Application of Surge Voltage Protective Equipment on
11、 AC Rotating Machinery 1000 V and Greater.) This guide started with the publishing of an IEEE transactions paper in 1981 by a Working Group of the Rotating Machinery Committee. That paper, “Impulse Voltage Strength of AC Rotating Machines,” made a significant contribution to the ease of protecting e
12、lectric utility rotating machines from surges. The paper indicated that ac machines could be expected to withstand surge fronts of five microseconds with magnitude equal to the crest of the factory test voltage, and could withstand surge fronts as short as 200 nanoseconds with magnitude equal to two
13、 times crest line-to-ground rated voltage. At that time, ac machine manufactur- ers were usually recommending that large motors be surge protected on the grounds that protection was cheap and failure was costly. It was recognized that most of the knowledge was with the manufacturers, not the users.
14、There was little measured data on the actual surge environment experienced by machines, nor was there measured data of actual withstand voltage or voltage to breakdown of machines in service. In addition, a survey of several thousand motors in industrial service showed that few were equipped with su
15、rge protec- tion, and there was almost no evidence of failure due to absence of surge protection. A survey by WG 3.4.9 of Surge Protective Devices Committee found (from a small sample of utility installations) that surge protec- tive capacitors were failing at about the same rate as those motor insu
16、lation failures that were not caused by overheating. It was also recognized that capacitor leads as usually installed, and even when of quite short lengths, have sufficient inductance to prevent the capacitor from protecting the machine from steep-front surges. Motor starting surge fronts as short a
17、s 200 nanoseconds had been measured. At the instigation of an Edison Electric Institute committee and with electric utility support, the Electric Power Research Institute (EPRI) undertook a research program to investigate the surge environment being experienced by ac rotating machines, and machine s
18、urge withstand strength. The effort was directed to understand and be able to predict whether a particular machine was at risk. Both motors and generators were investigated. Particular attention was given to the problem of steep-front surges produced by full-volt- age starting of motors (across-the-
19、line). Much of the field and analytical work was contracted by EPRI to Ontario Hydro. By courtesy of EPRI and Ontario Hydro, and at their expense, IEEE transaction papers were prepared to make the substance of their research generally available to the electric power industry and for preparation of I
20、EEE guides. Concurrent with the EPRUOntario Hydro work, the National Electrical Manufacturers Association (NEMA), the International Electrotechnical Commission (IEC), and the IEEE have developed factory surge test standards for some ac machines. This guide is intended to aid engineers at all levels
21、of surge protection knowledge in deciding whether par- ticular machines should have surge protection. The guide may be used in estimating the surge withstand capability and switching surge exposure of ac rotating machinery in usual, not extreme exposure, installations. Copyright O 2004 IEEE. All rig
22、hts reserved. . 111 Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:53:06 MDTNo reproduction or networking permitted without license from IHS -,-,- Participants A
23、t the time this guide was completed Working Group 3.4.9 of the PES Surge Protective Devices Committee had the following membership: David W. Jackson, Chair James J. Burke E.W. Knapp Eva J. Tarasiewicz E. Peter Dick Joseph L. Koepfinger Edgar R. Taylor, Jr. Dan Dunlap Subinoy Mazumdar Ron Wellman Tho
24、mas Field Bert Parsons Steve G. Whisenant A. Bob Hileman Thomas Rozek Jeffrey S . Williams Ronald W. Hotchkiss Keith B. Stump James W. Wilson, Jr. At the time this guide was completed, the PES Surge Protective Devices Committee had the following membership: J. J. Woodworh, Chair G. L. Goedde, Vice C
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