American National Standard. Polyphase Induction Motors for Power Generating Stations ANSI/NEMA C Secretariat

Transcription

1 ANSI/NEMA C American National Standard Polyphase Induction Motors for Power Generating Stations Secretariat National Electrical Manufacturers Association Approved July 17, 2012 American National Standards Institute, Inc.

2 Page ii American National Standard Approval of an American National Standard requires verification by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards 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 toward 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 standards. 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 American 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 CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time.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 Standards 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. Published by National Electrical Manufacturers Association 1300 N. 17th Street, Rosslyn, Virginia Copyright 2013 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, without prior written permission of the publisher. Printed in the United States of America.

3 Page iii TABLE OF CONTENTS Foreword... ix 1 Scope Inclusions Exclusions Applicable Standards Definitions Design Type Design NT Design HT Service Factor Classification of Insulation Systems Service Conditions Usual Service Conditions Unusual Service Conditions Basis of Rating Horsepower Frequency Speed Voltage Horsepower Ratings of Multispeed Motors General Constant Horsepower Constant Torque Variable Torque Variable Torque Linear Variable Torque Square Insulation Systems Service Factor Service Factor of Service Factor of General Temperature Rise Temperature General... 7

4 Page iv 9.2 Temperature Rise Barometric Pressure Cooling Air Reference Ambient Temperature Totally Enclosed Water-Air-Cooled Motors Resistance Method for Temperature Measurement Embedded-Detector Method for Temperature Measurement Resistance Temperature Detectors Locations of Embedded Detectors Motor Lead Total Temperature Torques Starting Requirements Starting Capabilities Number of Starts Starting Information Nameplate Load Inertia (Wk 2 ) Design NT Motors Design HT Motors Variation from Rated Voltage and Rated Frequency Running Starting Performance Characteristics Other Load-Torque Characteristics Momentary Operation Effects Of Unbalanced Voltages On The Performance Of Polyphase Squirrel-Cage Induction Motors Effect on Performance - General Voltage Imbalance Defined Torques Full-Load Speed Currents Bus Transfer or Reclosing General Slow Transfer or Reclosing Fast Transfer or Reclosing Recommendations Power Factor Correction... 16

5 Page v 15.1 Corrective KVAR Capacitors Autotransformer Starters Efficiency Stator current pulsations Surge Capabilities of AC Winding with Form-Wound Coils General Surge Capacitors Stator Windings Method of Test Test Voltage Adjustment Motors Operating on an Ungrounded System Occasional Excess Current Operation of Induction Motors from Variable-Frequency or Variable-Voltage Power Supplies, or Both Belt, Chain, and Gear Drive Aseismatic Capability Earthquake Damage System Requirements Motor Requirements Supporting Base Structure Airborne Sound Sound Quality Sound Measurement Sound Power Levels Bearings Horizontal Motors Vertical Motors Oil Lubrication Antifriction Bearings Shaft Currents Lubrication System Supplied From the Driven Equipment System Auxiliary Lubrication System Overspeed Construction Features Protection of Motor Leads from Mechanical Damage Drainage... 24

6 Page vi 28.3 Cooler-Tube Leakage Space Heaters Horizontal Sleeve Bearing Motors Grounding Terminal Housing and Boxes General Dimensions and Volumes Accessory Leads Coupling End Play and Rotor Float General Flexible Couplings Assembly Motor Vibration General Limits Reed Frequency of Vertical Motors Static Deflection Radial Resonant Frequency Determining System Resonant Frequency High-Potential Tests Safety Precautions and Test Procedure Test Voltage Motor with Sealed Windings Conformance Tests Test for Stator Which Can Be Submerged Test for Stator Which Cannot Be Submerged Tests on Complete Motors General Tests on Motors Completely Assembled in the Factory Required Factory Tests Optional Tests Tests on Motors Not Completely Assembled in the Factory Required Tests Recommended Field Tests Rotation Nameplate Unidirectional Fans Nameplate... 31

7 Page vii 36.1 Construction Marking Documentation General Motor Data Performance Curves Performance Data Accessories Test Reports Drawings Instruction Manual General Equipment Handling Equipment Storage Optional Documentation... 34

8 C Page viii

9 Page ix Foreword (This Foreword is not a part of American National Standard Polyphase Induction Motors for Power Generating Stations, ANSI C ) This standard was developed by the Subcommittee on Polyphase Induction Motors and Generators of American National Standards Committee on Rotating Electrical Machinery, C50. The subcommittee membership reflects wide industrial experience in both the manufacture and use of polyphase induction motors intended for application in power generating stations. Portions of this standard are extracted from NEMA Standards Publication for Motors and Generators, NEMA MG1-1998, copyrighted by the National Electrical Manufacturers Association, and reproduced by permission. Suggestions for improvement of this standard will be welcome. They should be sent to the American National Standards Institute, 11 West 42nd Street, New York, New York This standard was processed and approved for submittal to ANSI by American National Standards Committee on Rotating Electrical Machinery, C50. Committee approval of the standard does not necessarily imply that all committee members voted for approval. At the time it approved this standard, the C50 Committee had the following members: W. R. McCown, Chair W. C. Buckson, Secretary Organization Represented Representative Association of Iron and Steel Engineers... Stanley C. Houk Chemical Manufacturers Association... David Pace Crane Manufacturers Association of America... David C. Wendt Electrical Apparatus Service Association... David L. Gebhart Thomas Bishop Prebel Christensen (Alt.) Electric Light & Power Group (EEI)... J. L. Koepfinger D. E. Loberg N. E. Rik Nilsson Barry Reichman Lawrence A. Wall Factory Mutual Systems... Dimitrious M. Karydas Hydraulic Institute... Lawrence R. Link Institute of Electrical & Electronics Engineers (IEEE)... Bal Gupta Nirmal K. Ghai Brian E. B. Gott William R. McCown J. Glen Karolyi National Electrical Contractors Association (NECA)... Don Johnson National Electrical Manufacturers Association (NEMA)... Joseph A. Kline Roger H. Daugherty Joseph E. Martin Dale Rawlings Technical Association of the Pulp & Paper Industry... C. Raymond Church

10 Page x U. S. Department of the Navy... John Anderson Romulo R. Nicholas Individual Members... Lorne W. Brotherton Joseph P. Fitzgerald Bjorn M. Kaupang Paul I. Nippes Perry A. Weyant The Subcommittee on Polyphase Induction Motors for Power Generating Stations, which developed this standard, had the following members: N. E. Nilsson, Chair J. C. Appiarius W.C.Buckson, Secretary R. Covarrubias R. H. Daugherty J. H. Dymond N. K. Ghai D. Hassan T. A. Higgins H. C. Karmaker J. A. Kline A. Koutsoukos J. R. Michalec P. Nippes E. L. Owen D. Pace R. D. Pettigrew, Jr. B. Reichman S. L. Rogan J. Stein L. A. Wall R. E. Whetstine C50 COMMITTEE.xls C50.41 COMMITTEE.xls

11 Page 1 AMERICAN NATIONAL STANDARD ANSI/NEMA C Polyphase Induction Motors for Power Generating Stations Part I: General 1 Scope 1.1 Inclusions The requirements in this standard apply to polyphase induction motors intended for use in power generating stations, including the following: a) Frame size larger than NEMA 440 series b) Squirrel-cage type c) Single speed or multispeed d) Horizontal or vertical construction e) Form wound 1.2 Exclusions Excluded from the scope of this standard are: a) Additional specific features that may be required for application in nuclear power generating stations b) Additional specific features required in motors for use in hazardous (classified) locations c) Starting motors for reversible synchronous generator/motor units for pumped storage installations d) Wound-rotor motors 2 Applicable Standards Definitions, characteristics, and test methods not specifically covered in this standard shall comply with the following reference standards insofar as they are applicable. When the referenced American National Standards are superseded by a revision approved by the American National Standards Institute, Inc., the revision shall apply. American National Standard Load Ratings and Fatigue Life for Ball Bearings, ANSI/ABMA American National Standard Load Ratings and Fatigue Life for Roller Bearings, ANSI/ABMA American National Standard Test Procedure for Polyphase Induction Motors and Generators, ANSI/IEEE American National Standard Guide for Testing Turn-to-Turn Insulation on Form-Wound Stator Coils for Alternating-Current Rotating Electrical Motors, ANSI/IEEE American National Standard Guide for Construction and Interpretation of Thermal Limit Curves for Squirrel-Cage Motors Over 500 Horsepower, ANSI/IEEE American National Standard Safety Standard for Construction and Guide for Selection, Installation, and Use of Electric Motors and Generators, NEMA MG Available from the American National Standards Institute, 11 West 42nd Street, New York, NY and from the Anti-Friction Bearing Manufacturers Association, Century Building, Suite 1015, 2341 Jefferson Davis Highway, Arlington, VA Available from the American National Standards Institute, 11 West 42nd Street, New York, NY and from the Institute of Electrical and Electronics Engineers, 345 East 47th Street, New York, NY Available from the American National Standards Institute, 11 West 42nd Street, New York, NY and from the National Electrical Manufacturers Association, 1300 North 17th Street, Rosslyn, VA