SN EN 60034-2 : 1996 AMD 2 1996

SECTION ONE - GENERAL
1 Scope
2 Object
3 General
      3.1 List of symbols
4 Definitions
      4.1 Efficiency
      4.2 Total loss
      4.3 Breaking test
      4.4 Calibrated driving machine test
      4.5 Mechanical back-to-back test
      4.6 Electrical back-to-back test
      4.7 Retardation test
      4.8 Calorimetric test
      4.9 No-load test
      4.10 Open-circuit test
      4.11 Sustained short-circuit test
      4.12 Zero power factor-test
5 Reference temperature
SECTION TWO - D.C. MACHINES
6 Losses to be included
      6.1 Excitation circuit losses
      6.2 Constant losses
      6.3 Load losses
      6.4 Additional load losses
7 Determination of efficiency
      7.1 Summation of losses
      7.2 Total loss measurement
      7.3 Direct measurement of efficiency
SECTION THREE - POLYPHASE INDUCTION MACHINES
8 Losses to be included
      8.1 Constant losses
      8.2 Load losses
      8.3 Additional load losses
9 Determination of efficiency
      9.1 Summation of losses
      9.2 Total loss measurement
      9.3 Direct measurement of efficiency
SECTION FOUR - SYNCHRONOUS MACHINES
10 Losses to be included
      10.1 Constant losses
      10.2 Load losses
      10.3 Excitation circuit losses
      10.4 Additional load losses
11 Determination of efficiency
      11.1 Summation of losses
      11.2 Total loss measurement
      11.3 Direct measurement of efficiency
SECTION FIVE - METHODS OF TEST
12 General
13 Calibrated machine test
14 Zero power factor test
15 Retardation method
16 Electrical back-to-back test
17 Calorimetric test
18 Schedule of preferred tests
      18.1 D. C. machines
      18.2 Polyphase induction machines
      18.3 Synchronous machines
Figures
Annex A - Provisional methods for determining losses and efficiency of
          converter-fed cage induction machines
Annex B - IEC 34-2A Measurement of losses by the calorimetric method
Introduction
SECTION ONE - GENERAL
1 General
2 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
      method
4 Stable conditions
5 Losses P2 not transmitted to the cooling medium
6 Losses external to the reference surface Pe
SECTION TWO - WATER AS THE COOLING MEDIUM
7 Application and basic relationship
8 Measurement of water flow
9 Measurement of the temperature rise of the water
10 Measuring accuracy
SECTION THREE - AIR AS THE COOLING MEDIUM
11 Application and basic relationship
12 Determination of the mass rate of flow
13 Measurement of the temperature rise of the air
14 Determination of the specific heat capacity of the air
15 Measuring accuracy
SECTION FOUR - PRACTICAL CONSIDERATIONS
16 Preparations for calorimetric measurements with liquid coolants
17 Connections and equipment for calorimetric measurements with
      liquid coolants
Figures

Applicable to d.c. machines and to a.c. synchronous and induction machines of all sizes within the scope of IEC Publication 34-1. Also applies to other types of machines such as rotary a.c. commutators, convertor motors and single-phase induction motors, that other methods of determining losses are used generally.