IEC 60034-2-1:2007

IEC 60034-2-1
Edition 1.0 2007-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines –
Part 2-1: Standard methods for determining losses and efficiency from tests
(excluding machines for traction vehicles)

Machines électriques tournantes –
Partie 2-1: Méthodes normalisées pour la détermination des pertes et du
rendement à partir d’essais (à l’exclusion des machines pour véhicules de
traction)
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IEC 60034-2-1
Edition 1.0 2007-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines –
Part 2-1: Standard methods for determining losses and efficiency from tests
(excluding machines for traction vehicles)

Machines électriques tournantes –
Partie 2-1: Méthodes normalisées pour la détermination des pertes et du
rendement à partir d’essais (à l’exclusion des machines pour véhicules de
traction)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XB
CODE PRIX
ICS 29.160 ISBN 2-8318-9250-3
– 2 – 60034-2-1 © IEC:2007
CONTENTS
FOREWORD.4

INTRODUCTION.6

1 Scope.7

2 Normative references.7

3 Terms and definitions .8

4 Symbols and abbreviated terms .13

4.1 Symbols .13
4.2 Additional subscripts.14
5 Basic requirements .15
5.1 Direct and indirect efficiency determination .15
5.2 Uncertainty .15
5.3 Preferred methods.16
5.4 Power supply.20
5.5 Instrumentation.20
5.6 Units .21
5.7 Resistance .21
6 Test methods for determination of efficiency .22
6.1 State of the machine under test and test categories .22
6.2 Excitation circuit measurements.23
6.3 Direct measurements.23
6.4 Indirect measurements .25
7 Determination of efficiency (direct current machines) .37
7.1 Determination from direct measurement.37
7.2 Determination from indirect measurement.37
8 Determination of efficiency (induction machines) .42
8.1 Determination from direct measurement.42
8.2 Determination from indirect measurement.43
9 Determination of efficiency (synchronous machines) .54
9.1 Determination from direct measurement.54
9.2 Determination from indirect measurement.55

Annex A (normative) Correction of dynamometer torque readings .61
Annex B (normative) Calculation of values for the Eh-star method .63
Annex C (informative) Types of excitation systems .66
Annex D (normative) Other test methods .67

60034-2-1 © IEC:2007 – 3 –
Figure 1 – Sketch for torque measurement test .24

Figure 2 – Sketch for dual supply back-to-back test (for synchronous machines:

I==If, f ) .24
MG M G
Figure 3 – Sketch for single supply back-to-back test, d.c. machines .26

Figure 4 – Sketch for single supply back-to-back test, synchronous machines .27

Figure 5 – Induction machine, T-model with equivalent iron loss resistor.31

Figure 6 – Sketch for single supply back-to-back, additional losses, d.c. machines .32

Figure 7 – Eh-star test circuit .35
Figure 8 – Vector diagram for obtaining current vector from reduced voltage test.46
Figure 9 – Induction machines, Reduced model for calculation .49
Figure 10 – Smoothing of the residual loss data.51
Figure 11 – Assigned allowance for additional load losses P , induction machines.53
LL
Table 1 – DC machines .17
Table 2 – Induction machines.18
Table 3 – Synchronous machines .19
Table 4 – Reference temperature .22
Table 5 – Multiplying factors for different speed ratios .42

– 4 – 60034-2-1 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
ROTATING ELECTRICAL MACHINES –

Part 2-1: Standard methods for determining losses

and efficiency from tests
(excluding machines for traction vehicles)

FOREWORD
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