C392-11

Testing of three-phase squirrel cage induction motors during refurbishment

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CSA Standards Update Service

C392-11

March 2011

Title: Testing of three-phase squirrel cage induction motors during refurbishment

Pagination: 48 pages (ix preliminary and 39 text), each dated March 2011

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CSA Standard

C392-11

Testing of three-phase squirrel cage induction motors during refurbishment

Published in March 2011 by Canadian Standards Association A not-for-profit private sector organization

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ISBN 978-1-55491-523-1

© Canadian Standards Association — 2011

All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher.

© Canadian Standards Association

Contents

Testing of three-phase squirrel cage induction motors during refurbishment

Technical Committee on Industrial Equipment v Subcommittee on Motor Refurbishment vii Preface ix

0 Foreword 1

1. Scope 1

   
   

2. Reference publications 1

   
   

3. Definitions and symbols 2

   1. Definitions 2

   2. Symbols 3

      
      

4. Safety for inspections and tests 4

   
   

5. Test conditions, equipment, and instrumentation 4

   1. General comments 4

   2. Instrument selection 5

   3. Instrument transformers 5

   4. Voltage 5

   5. Current 5

   6. Input power 5

   7. DC resistance 5

      
      

6. Summary of inspection and tests 5

   
   

7. Incoming inspection 7

   
   

8. DC resistance test of stator winding 8

   1. Purpose 8

   2. Description 8

   3. Evaluation of results 9

   4. Calculations 9

   5. Consequences of deviation 10

      
      

9. Stator core magnetic circuit (laminations) testing 11

   1. Purpose 11

   2. Description 11

   3. Evaluation of results 12

   4. Calculations 12

   5. Consequences of deviation 12

      
      

10. Rotor squirrel cage testing 14

    1. Purpose 14

    2. Description of inspection elements and test options 15

    3. Evaluation of results 15

    4. Calculations 16

    5. Consequences of deviation 16

       
       

       March 2011 iii

       C392-11 © Canadian Standards Association

       
       

       
       

    6. Miscellaneous 16

       
       

11. No-load testing and inspection 17

    1. General 17

    2. Purpose 17

    3. Test conditions, equipment, and instrumentation 17

    4. Description 17

    5. Evaluation of results and pass/fail criteria 18

    6. Calculations 18

    7. Consequences of deviation 19

    8. Miscellaneous 20

    9. In-situ testing 20

       
       

12. Supplementary tests 21

    1. General 21

    2. No-load saturation test 22

    3. Full load test 22

    4. No-load blocked ventilation heat test 22

    5. Reduced or full voltage reversals 22

Annexes

A (informative) — Special tables, charts, and reports 23

B (informative) — No-load saturation analysis 37

C (informative) — Bibliography 39

Figures

1. — Summary recommended tests 6

2. — Flow chart for incoming inspection points 8

3. — Flow chart for DC resistance test of stator winding 11

4. — Flow chart for stator core testing 13

5. — EASA stator core test form 14

6. — Flow chart for rotor squirrel cage testing 16

7. — Flow chart for no-load testing 21

iv March 2011

© Canadian Standards Association

Testing of three-phase squirrel cage induction motors during refurbishment

Technical Committee on Industrial Equipment

D.R. Friesen Manitoba Hydro,

Winnipeg, Manitoba

Chair

D.A. Wiegand D.A. Wiegand Transformer Engineering Services, London, Ontario

Vice-Chair

T. Brennan Natural Resources Canada, Ottawa, Ontario

R.L. Cane Caneta Research, Mississauga, Ontario

Associate

A.J. Cordova V.J. Pamensky Canada Incorporated, Toronto, Ontario

D.H. Dederer Enertech Solutions Inc., Stouffville, Ontario

Associate

D.E. Delaney General Electric Company, Fort Wayne, Indiana, USA

P.S. dos Santos WEG Equipamentos Elétricos S.A. – Motores,

Jaragua Do Sul, Santa Catarina, Brazil

K. Elsey Canadian Energy Efficiency Alliance (CEEA), Mississauga, Ontario

P. Goulet Hydro-Québec, Montréal, Québec

Associate

E. Grzesik Ontario Ministry of Energy, Toronto, Ontario

G.D. Henriques Henriques Consulting, Richmond, British Columbia

Associate

T. Kaminski Saskatchewan Research Council, Saskatoon, Saskatchewan

Associate

V.H. Nielsen Nielsen Engineering, Meaford, Ontario

D. Ouellet BC Hydro,

Burnaby, British Columbia

Associate

March 2011 v

C392-11 © Canadian Standards Association

C. Pitis BC Hydro,

Burnaby, British Columbia

Associate

T. Rodrigues Technical Standards & Safety Authority (TSSA), Mississauga, Ontario

D.A. Sharkey Tecumseh, Ontario, Associate

E. St-Cyr Hydro-Québec, Montréal, Quebec

S. Stricker Stricker Associates Inc., Richmond Hill, Ontario

K.A. Veerman FortisBC Inc,

Kelowna, British Columbia

Associate

G. Verrall Allied Controls Limited, Burnaby, British Columbia

M. Zeller BC Hydro,

Burnaby, British Columbia

J.L. Hernandez CSA Standards, Mississauga, Ontario

Project Manager

vi March 2011

© Canadian Standards Association

Subcommittee on Motor Refurbishment

D. Ouellet BC Hydro,

Burnaby, British Columbia

Testing of three-phase squirrel cage induction motors during refurbishment

Chair

R. Gillard Cenovus Energy Inc, Calgary, Alberta

Vice-Chair

T.R. Akerstream Manitoba Hydro,

Winnipeg, Manitoba

P. Angers LTE Hydro Québec, Shawinigan, Québec

T.H. Bishop Electrical Apparatus Service, St. Louis, Missouri, USA

A. Bonnett Emerson,

Gallatin, Missouri, USA

L. Boutin Hydro-Québec-Distribution, Montréal, Québec

D. Bowns Green Motors Practices Group, Boise, Idaho, USA

T. Brennan Natural Resources Canada, Ottawa, Ontario

M.K. Bruin General Electric Company, Fort Wayne, Indiana, USA

F.J. Conci AC Motor Electric Ltd, Penticton, British Columbia

D.E. Delaney General Electric Company, Fort Wayne, Indiana, USA

P.S. dos Santos WEG Equipamentos Elétricos S.A. – Motores,

Jaragua Do Sul, Santa Catarina, Brazil

D.R. Friesen Manitoba Hydro,

Winnipeg, Manitoba

E. Grzesik Ontario Ministry of Energy, Toronto, Ontario

G.D. Henriques Henriques Consulting, Richmond, British Columbia

N. Hutchings Ontario Power Authority, Toronto, Ontario

March 2011 vii

C392-11 © Canadian Standards Association

M. Ishlove V.J. Pamensky Canada Incorporated, Toronto, Ontario

W.E. Lockley Lockley Engineering Ltd., Calgary, Alberta

T. May Trade-Mark Industry Inc., Kitchener, Ontario

S. Mugford Mugford Engineering, Calgary, Alberta

C. Pitis BC Hydro,

Burnaby, British Columbia

M. Zeller BC Hydro,

Burnaby, British Columbia

J.L. Hernandez CSA Standards, Mississauga, Ontario

Project Manager

viii March 2011

© Canadian Standards Association

Preface

Testing of three-phase squirrel cage induction motors during refurbishment

This is the first edition of CSA C392.11, Testing of three-phase squirrel cage induction motors during refurbishment.

CSA acknowledges that the development of this Standard was made possible, in part, by the financial support of BC Hydro, Manitoba Hydro, Natural Resources Canada (NRCan), and the Ontario Ministry of Energy and Infrastructure (OMEI).

This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard.

This Standard was prepared by the Subcommittee on Motor Refurbishment, under the jurisdiction of the Technical Committee on Industrial Equipment and the Strategic Steering Committee on Performance, Energy Efficiency, and Renewables, and has been formally approved by the Technical Committee.

March 2011

1. Use of the singular does not exclude the plural (and vice versa) when the sense allows.

2. Although the intended primary application of this Standard is stated in its Scope, it is important to note that it remains the responsibility of the users of the Standard to judge its suitability for their particular purpose.

3. This publication was developed by consensus, which is defined by CSA Policy governing standardization — Code of good practice for standardization as “substantial agreement. Consensus implies much more than a simple majority, but not necessarily unanimity”. It is consistent with this definition that a member may be included in the Technical Committee list and yet not be in full agreement with all clauses of this publication.

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March 2011 ix

© Canadian Standards Association

C392-11

Testing of three-phase squirrel cage induction motors during refurbishment

Testing of three-phase squirrel cage

induction motors during refurbishment

0 Foreword

This Standard provides guidance to electric motor service centres in verifying that the refurbishing process has maintained or enhanced the electric motor (hereafter motor) efficiency. It is also intended to provide a reliable evaluation of any changes in the condition of the motor, with respect to its efficiency, that might have resulted from its failure.

The intent of this Standard is not to prescribe which tests should be performed on any given motor requiring repairs; rather, it is to establish a consistent methodology for conducting the tests described herein. The applicability of these tests depends on the type of failure encountered, the repair work to be performed, and the need to confirm that no change in efficiency has occurred as a result of damage to the motor and its repair. The motor end user and the service centre should mutually determine which tests are applicable or useful in a given situation to establish the scope of testing during the repair process.

Motor efficiency can be depreciated by the damage caused during motor operation or failure mode. In cases where the test results do not comply with the pass/fail criteria, it is not the intent of this Standard to require that the motor be removed from service. However, the test results might assist in future repair/replace decisions and future energy conservation planning.

The tests and pass/fail criteria are standard in the motor service centre industry in North America.

There are many additional tests and inspection procedures employed when refurbishing AC motors that are not part of this Standard because they are not directly related to motor efficiency. Many of these additional tests are available in the publications referenced in Clause 2 and Annex C. Not all of these tests can or should be administered on every motor that is to be refurbished. It is the responsibility of the motor service centre in consultation with the end user to determine which tests are applicable.

The tables and calculation procedures, provided in this Standard to estimate the impact on motor nominal efficiency, contain typical data and should be used with the understanding that these procedures are estimates based on the information available and that actual results can vary.

1. Scope

   This Standard covers integral horsepower, three-phase, alternating current, squirrel cage induction motors rated 200 to 13 200V at 60 Hz. This Standard also covers motors operating on variable frequency drives. Note: This Standard might be useful and may be applied with discretion to products outside the scope of this Standard.

   
   

2. Reference publications

This Standard refers to the following publications, and where such reference is made, it shall be to the edition listed below, including amendments published thereto.

CSA (Canadian Standards Association)

C22.2 No. 100-04 (R2009)

Motors and generators

March 2011 1