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General requirements for rotating electrical machines Methods for determining losses and efficiency from tests (excluding machines for traction vehicles)
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Available format(s): Hardcopy, PDF
Superseded date: 15-10-1999
Language(s): English
Published date: 27-02-1987
Publisher: British Standards Institution
ForewordCommittees responsibleMethodsSection one - General1. Scope 2. Object3. General4. Definitions5. Reference temperatureSection two - D.C. machines6. Losses to be included7. Determination of efficiencySection three - Polyphase induction machines8. Losses to be included9. Determination of efficiencySection four - Synchronous machines10. Losses to be included11. Determination of efficiencySection five - Methods of test12. General13. Calibrated machine test14. Zero power factor test15. Retardation method16. Electrical back-to-back test17. Calorimetric test18. Schedule of preferred testsTable1. Multiplying factors for different speed ratiosFiguresAppendixA. IEC 34-2A Measurement of losses by the calorimetric methodIntroductionSection one - General1. General2. Determination of losses P1 by measurement of the volume rate of flow and rise in temperature of the cooling medium 3. Losses P1 measured electrically using the calorimetric calibration method4. Stable conditions5. Losses P2 not transmitted to the cooling medium6. Losses external to the reference surface PeSection two - Water as the cooling medium7. Application and basic relationship8. Measurement of water flow9. Measurement of the temperature rise of the water10. Measuring accuracySection three - Air as the cooling medium11. Application and basic relationship12. Determination of the mass rate of flow13. Measurement of the temperature rise of the air14. Determination of the specific heat capacity of the air15. Measuring accuracySection four - Practical considerations16. Preparations for calorimetric measurements with liquid coolants17. Connections and equipment for calorimetric measure- ments with liquid coolantsTablesI. Measurement error in calorimetry by waterII. Measurement error in calorimetry by airFigures
Details calibrated machine test, zero power factor test, retardation method, electrical back-to-back test and calorimetric test.
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