BS 4999-102: BRITISH STANDARD 1987 IEC 34-2:1972 and IEC 34-2A: 1974 General requirements for rotating electrical machines Part 1o2: Methods for determining losses and efficiency from tests (excluding machines for traction vehicles) UDC 621.31313:621.313.017.001.4 BSi BS 4999-102:1987 Committees responsible for this British Standard BSI The preparation of this British Standard was entrusted by the Power Electrical Engineering Standards Committee (PEL/-) to Technical Committee PEL/1, upon which the following bodies were represented: Association of Consulting Engineers Association of Electrical Machinery Trades Association of Manufacturers Allied to the Electrical and Electronic Industry (BEAMA Ltd.) Association of Supervisory and Executive Engineers British Coal Bureau of Engineer Surveyors ERA Technology Ltd. Electricity Supply Industry in England and Wales Engineer Surveyors Section of the ASTMS Engineering Equipment and Materials Users' Association Health and Safety Executive Ministry of Defence Power Generation Association (BEAMA Ltd.) Rotating Electrical Machines Association (BEAMA Ltd.) South of Scotland Electricity Board This British Standard, having been prepared under the direction of the Power Electrical Engineering Standards Committee, was published under the authority of the Board of BSI and comes into effect on 27 February 1987 Copy: C BSI 10-1999 First published as BS 4999-33 March 1977 Amendments issued since publication Licensed First revision as BS 4999-102 February 1987 Comments Amd. No. Date of issue The following BSI references relate to the work on this standard: Committee reference PEL/1 Revision announced in BSI News october 1986 ISBN 0 580 15786 5 BS 4999-102:1987 Contents Page Inside front cover Committees responsible BSI National foreword iii Section 1. General Scope 1 1 2 Object 1 3 General 1 Definitions 4 2 Reference temperature 3 5 Section 2. D.C. machines 6 Losses to be included 3 7 Determination of efficiency 4 Section 3. Polyphase induction machines 7 8 Losses to be included Determination of efficiency 8 6 Section 4. Synchronous machines 10 10 Losses to be included 11 Determination of efficiency 11 Section 5. Methods of test 12 General 14 13 Calibrated machine test 14 14 Zero power factor test 15 15 Retardation method 15 16 Electrical back-to-back test 16 17 Calorimetric test 16 18 Schedule of preferred tests 16 Appendix A IEC 34-2A Measurement of losses by the calorimetric method 19 19 Introduction Section 1. General 1 General 19 2 Determination of losses Pi by measurement of the volume rate of flow and rise in temperature of the cooling medium 19 3 Losses P measured electrically using the calorimetric 20 calibration method 4 Stable conditions 20 5 Losses P2 not transmitted to the cooling medium 20 21 6 Losses external to the reference surface Pe Section 2. Water as the cooling medium 22 7 Application and basic relationship 8 22 Measurement of water flow 6 Measurement of the temperature rise of the water 23 Measuring accuracy 23 10 Section 3. Air as the cooling medium 11 Application and basic relationship 24 24 12 Determination of the mass rate of flow 13 Measurement of the temperature rise of the air 26 27 14 Determination of the specific heat capacity of the air Measuring accuracy 27 15 CBSI10-1999