IEEE C62 21 ERTA-2006 en Errata to IEEE Guide for the Application of Surge Voltage Protective Equipment on AC Rotating Machinery 1000 V and Greater《交流旋转电机1000 V.pdf

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1、22 March 2006 SH95200IEEE Std C62.21-2003Errata to IEEE Guide for the Application ofSurge Voltage Protective Equipmenton AC Rotating Machinery 1000 Vand GreaterSponsorSurge Protective Devices Committeeof theIEEE Power Engineering SocietyCorrection SheetIssued 22 March 2006Copyright 2006 by the Insti

2、tute of 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 currencyof the underlying Standard. This correction sheet may not be sold

3、, licensed or otherwise distributed for anycommercial purposes whatsoever. The content of this correction sheet may not be modified.22 March 2006 SH95200Page 4, Clause 3 Definitions, change the Note to read as follows:NOTEThe following definitions are purposely not alphabetized. Rather, the terms ar

4、e arranged in such away as to facilitate an understanding of the technical relationship between them. The terms proceed in orderof technical dependency.Page 33, the paragraph below Equation (9) should read as follows:The attenuation factor cis due to conductor skin effect, ddielectric loss and ssemi

5、-conductive layerloss. These losses are evaluated at 1 MHz in units of dB per meter as follows, and are then multiplied by thecable length, meters. Estimate skin effect loss cat this frequency using Equation (A.10).Page 33, the first paragraph below Equation (10) should read as follows:Where Kmis a

6、conductor material parameter and w is the surface width (mm) over which current flowsB22. Values of Kmfor common materials are 1.1 for copper, 1.5 for aluminum, 3.9 for lead, and 30 forsteel (assuming a relative permeability of 100). For unshielded cables consider only one phase conductorsince Zcin

7、Equation (A.10) is per phase. For shielded cables, the attenuation should be taken as the sum oflosses 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 effect, s, is about0.2 l03dB/m.