SOUTH AFRICAN NATIONAL STANDARD

Transcription

1 ISBN Edition 4 IEC :2010 Edition 12 SOUTH AFRICAN NATIONAL STANDARD Rotating electrical machines Part 1: Rating and performance This national standard is the identical implementation of IEC :2010, and is adopted with the permission of the International Electrotechnical Commission. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001 Tel: Fax: SABS

2 Edition 4 IEC :2010 Edition 12 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS/TC 061, Rotating machinery, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in July This SANS documents supersedes SANS :2006 (edition 3). Reaffirmed and reprinted in February This document will be reviewed every five years and be reaffirmed, amended, revised or withdrawn. SABS

3 INTERNATIONAL STANDARD NORME INTERNATIONALE IEC Edition Rotating electrical machines Part 1: Rating and performance Machines électriques tournantes Partie 1: Caractéristiques assignées et caractéristiques de fonctionnement INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE PRICE CODE CODE PRIX XB ICS ISBN Registered trademark of the International Electrotechnical Commission Marque déposée de la Commission Electrotechnique Internationale

4 IEC:2010 CONTENTS FOREWORD Scope Normative references Terms and definitions Duty Declaration of duty Duty types Rating Assignment of rating Classes of rating Selection of a class of rating Allocation of outputs to class of rating Rated output Rated voltage Co-ordination of voltages and outputs Machines with more than one rating Site operating conditions General Altitude Maximum ambient air temperature Minimum ambient air temperature Water coolant temperature Storage and transport Purity of hydrogen coolant Electrical operating conditions Electrical supply Form and symmetry of voltages and currents Voltage and frequency variations during operation Three-phase a.c. machines operating on unearthed systems Voltage (peak and gradient) withstand levels Thermal performance and tests Thermal class Reference coolant Conditions for thermal tests Temperature rise of a part of a machine Methods of measurement of temperature Determination of winding temperature Duration of thermal tests Determination of the thermal equivalent time constant for machines of duty type S Measurement of bearing temperature Limits of temperature and of temperature rise Other performance and tests Routine tests Withstand voltage test...51

5 IEC: Occasional excess current Momentary excess torque for motors Pull-up torque Safe operating speed of cage induction motors Overspeed Short-circuit current for synchronous machines Short-circuit withstand test for synchronous machines Commutation test for commutator machines Total harmonic distortion (THD) for synchronous machines Rating plates General Marking Miscellaneous requirements Protective earthing of machines Shaft-end key(s) Tolerances General Tolerances on values of quantities Electromagnetic compatibility (EMC) General Immunity Emission Immunity tests Emission tests Safety...65 Annex A (informative) Guidance for the application of duty type S10 and for establishing the value of relative thermal life expectancy TL...67 Annex B (informative) Electromagnetic compatibility (EMC) limits...68 Bibliography...69 Figure 1 Continuous running duty Duty type S Figure 2 Short-time duty Duty type S Figure 3 Intermittent periodic duty Duty type S Figure 4 Intermittent periodic duty with starting Duty type S Figure 5 Intermittent periodic duty with electric braking Duty type S Figure 6 Continuous operation periodic duty Duty type S Figure 7 Continuous operation periodic duty with electric braking Duty type S Figure 8 Continuous operation periodic duty with related load/speed changes Duty type S Figure 9 Duty with non-periodic load and speed variations Duty type S Figure 10 Duty with discrete constant loads Duty type S Figure 11 Voltage and frequency limits for generators...34 Figure 12 Voltage and frequency limits for motors...34 Table 1 Preferred voltage ratings...29 Table 2 Unbalanced operating conditions for synchronous machines...32