NEMA-C50.41-2000.pdf
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1、American National Standard for Polyphase Induction Motors for Power Generating Stations Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMALicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 08:33:54 MDTNo reproduction or networking p
2、ermitted without license from IHS -,-,- ANSI C50.41-2000 American National Standard for Polyphase Induction Motors for Power Generating Stations Secretariat National Electrical Manufacturers Association Approved March 30, 2000 American National Standards Institute, Inc. Copyright National Electrical
3、 Manufacturers Association Provided by IHS under license with NEMALicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 08:33:54 MDTNo reproduction or networking permitted without license from IHS -,-,- ANSI C50.41-2000 Page ii Polyphase Induction Motors for Power Generating Stat
4、ions American Approval of an American National Standard requires verification by ANSI that the requirements for due process, consensus, and other criteria for approval have been Nation a I met by the standards developer. Standard Consensus is established when, in the judgment of the ANSI Board of St
5、andards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made towar
6、d their resolution. The use of American National Standards is completely voluntary: their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the stan
7、dards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the Amer
8、ican National Standards Institute. Requests for interpretations shall be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Sta
9、ndards Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of approval. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute.
10、 Published by National Electrical Manufacturers Association 1300 N. 17th Street, Rosslyn, Virginia 22209 Copyright O 2000 National Electrical Manufacturers Association All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, with
11、out prior written permission of the publisher. Printed in the United States of America Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMALicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 08:33:54 MDTNo reproduction or networking pe
12、rmitted without license from IHS -,-,- Polyphase Induction Motors for Power Generating Stations ANSI C50.41-2000 Page iii TABLE OF CONTENTS Foreword . ix 1 2 3 4 5 6 7 8 9 Scope 1 1 . 1 Inclusions . 1 1.2 Exclusions 1 Applicable Standards . 1 Definitions 2 3.1 Design Type . 2 3.1.1 Design NT 2 3.1.2
13、 Design HT 2 3.2 Service Factor 2 3.3 Classification of Insulation Systems . 2 Service Conditions . 2 4.1 Usual Service Conditions . 2 4.2 Unusual Service Conditions . 3 Basis of Rating . 4 5.1 Horsepower 4 5.2 Frequency . 4 5.3 Speed . 4 5.4 Voltage . 4 Horsepower Ratings of Multispeed Motors 5 6.1
14、 General . 5 6.2 Constant Horsepower . 5 6.3 Constant Torque . 5 6.4 Variable Torque 5 6.4.1 Variable Torque Linear 5 6.4.2 Variable Torque Square . 5 Insulation Systems . 6 Service Factor 6 8.1 Service Factor of 1 .O 6 8.2 Service Factor of 1 . 15 6 8.2.1 General 6 8.2.2 Temperature Rise 6 Temperat
15、ure 7 9.1 General . 7 . . . . Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMALicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 08:33:54 MDTNo reproduction or networking permitted without license from IHS -,-,- ANSI (250.41 -2000
16、 Polyphase Induction Motors for Power Generating Stations Page iv 9.2 9.3 9.4 9.5 Temperature Rise . 7 9.2.1 Barometric Pressure 7 9.2.2 Cooling Air . 7 9.2.3 Reference Ambient Temperature 8 9.2.4 Totally Enclosed Water-Air-Cooled Motors 8 Resistance Method for Temperature Measurement 8 Embedded-Det
17、ector Method for Temperature Measurement 8 9.4.1 Resistance Temperature Detectors . 8 9.4.2 Locations of Embedded Detectors . 8 Motor Lead Total Temperature 8 10 11 12 13 14 15 Torques 8 Starting Requirements . 9 11.1 Starting Capabilities 9 11.2 Number of Starts 9 11.3 Starting Information Nameplat
18、e . 9 Load Inertia (Wk) 10 12.1 Design NT Motors 10 12.2 Design HT Motors 10 Variation from Rated Voltage and Rated Frequency . 10 13.1 Running 1 0 13.2 Starting . 11 13.2.1 Performance Characteristics . 11 13.2.20ther Load-Torque Characteristics . 11 13.3 Momentary Operation . 11 13.4 Effects Of Un
19、balanced Voltages On The Performance Of Polyphase Squirrel-Cage Induction Motors 12 13.4.1 Effect on Performance - General . 13 13.4.2Voltage Imbalance Defined 13 13.4.3Torques 14 13.4.4 Full-Load Speed . 14 13.4.5Currents . 14 Bus Transfer or Reclosing . 14 14.1 General . 14 14.2 Slow Transfer or R
20、eclosing 14 14.3 Fast Transfer or Reclosing . 15 14.4 Recommendations . 15 Power Factor Correction 16 Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMALicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 08:33:54 MDTNo reproduction o
21、r networking permitted without license from IHS -,-,- Polyphase Induction Motors for Power Generating Stations ANSI C50.41-2000 Page v 15.1 Corrective WAR 16 15.2 Capacitors . :17 15.3 Autotransformer Starters 17 16 Efficiency 17 17 Stator current pulsations 17 18 Surge Capabilities of AC Winding wi
22、th Form-Wound Coils . 18 18.1 General . 18 18.2 Surge Capacitors 18 18.3 Stator Windings 18 18.4 Method of Test . 18 18.5 Test Voltage Adjustment 19 19 Motors Operating on an Ungrounded System . 19 20 Occasional Excess Current 19 21 Operation of Induction Motors from Variable-Frequency or Variable-V
23、oltage Power Supplies, or Both . 1 9 22 Belt, Chain, and Gear Drive . 19 23 Aseismatic Capablllty 20 23.1 Earthquake Damage 20 . 23.2 System Requirements 20 23.3 Motor Requirements . 20 23.4 Supporting Base Structure . 20 24 Airborne Sound 21 24.1 Sound Quality . 21 24.2 Sound Measurement . . . . .
24、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 24.3 Sound Power Levels . 21 25 Bearings . 23 25 . 1 Horizontal Motors . 23 25.2 Vertical M
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