1 Scope
This part applies to DC machines and to AC synchronous and induction machines of all sizes within the scope of national standard GB 755-2000. The principles can, however, be applied to other types of machines such as rotary convertors, AC commutator motors and single-phase induction motors for which other methods of determining losses are generally used.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this part are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies.
GB 755-2000 Rotating Electrical Machines - Rating and Performance (idt IEC 60034-1:1996)
GB/T 2900.25-1994 Electrotechnical Terminology - Rotating Electrical Machines (neq IEC 50 (411) 19845)
GB/T 5321-1985 Measurement of Loss and Efficiency for Large AC Electrical Machines by the Calorimetric Method (neq IEC 60034-2A: 1974)
GB/T 7676.1-1998 Direct Acting Indicating Analogue Electrical Measuring Instruments and Their Accessories - Part 1: Definition and General Requirements Common to All Parts (idt IEC 51-1: 1984)
IEC 34-17: 1992 Guide for Application of Cage Induction Motors when Fed from Converters
3 General
3.1 Object
This part is intended to establish methods of determining efficiencies from tests, and also to specify methods of obtaining particular losses when these are required for other purposes.
Foreword I
1 Scope
2 Normative References
3 General
3.1 Object
3.2 General
3.3 Definitions
3.4 Reference Temperature
4 DC Machines
4.1 Losses to be Included
4.2 Definition of Efficiency
5 Poly-phase Induction Machines
5.1 Losses to be Included
5.2 Determination of Efficiency
6 Synchronous Machines
6.1 Losses to be Included
6.2 Determination of Efficiency
7 Methods of Test
7.1 General
7.2 Calibrated Machine Test
7.3 Zero Power Factor Test
7.4 Retardation Method
7.5 Electrical Back-to-back Test
7.6 Calorimetric Test
7.7 Schedule of Preferred Tests
Appendix A (Informative) Provisional Methods for Determining Losses and Efficiency of Converter-fed Cage Induction Machines
A.1 Determination of Losses and Efficiency of Converter-fed Motors
A.2 Requirements for the Measuring Instruments
A.3 Total Loss Measurement
A.4 Summation of Losses
A.5 Method with Assumed Increments to the Losses Determined on Sinusoidal Supply
A.6 Basic Considerations Concerning Converters
