IEC 60034-28:2012

Rotating electrical machines - Part 28: Test methods for determining quantities of equivalent circuit diagrams for three-phase low-voltage cage induction motors

IEC 60034-28:2012 applies to three-phase low-voltage cage induction motors of frame numbers 56 to 400 as specified in IEC 60072-1. This standard establishes procedures to obtain values for elements of single phase equivalent circuit diagrams from tests and defines standard elements of these diagrams. This edition includes the following significant technical changes with respect to the previous edition:
- the formulae are now all given for equivalent star-connection equivalent circuit diagrams;
- procedures for the determination of equivalent circuit parameters from a load curve test as an alternative to the reverse rotation and locked rotor tests have been added.

Machines électriques tournantes - Partie 28: Méthodes d'essai pour la détermination des grandeurs des schémas d'équivalence des circuits pour moteurs à induction à cage basse tension triphasés

La CEI 60034-28:2012 s'applique aux moteurs à induction à cage basse tension triphasés de désignations de carcasses entre 56 et 400, spécifiés dans la CEI 60072-1. La présente norme définit des éléments normalisés de schémas de circuits équivalents monophasés et établit à partir d'essais des procédures pour obtenir des valeurs pour ces éléments. Cette édition inclut les modifications techniques significatives suivantes par rapport à l'édition précédente:
- toutes les formules sont maintenant données pour des circuits de connexion en étoile équivalente;
- les procédures pour la détermination des paramètres du circuit équivalent à partir d'un test de courbe de charge, comme alternative aux tests en rotation en sens inverse et rotor bloqué rotors, ont été ajoutées.

General Information

• Status: Published
• Publication Date: 12-Dec-2012
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.160.01 - Rotating machinery in general
• Technical Committee: TC 2 - Rotating machinery
• Drafting Committee: WG 28 - TC 2/WG 28
• Current Stage: PPUB - Publication issued
• Start Date: 15-Jan-2013
• Completion Date: 13-Dec-2012

Relations

• Revises: IEC 60034-28:2007 - Rotating electrical machines - Part 28: Test methods for determining quantities of equivalent circuit diagrams for three-phase low-voltage cage induction motors
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60034-28 ®
Edition 2.0 2012-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Rotating electrical machines –
Part 28: Test methods for determining quantities of equivalent circuit diagrams
for three-phase low-voltage cage induction motors

Machines électriques tournantes –
Partie 28: Méthodes d’essai pour la détermination des grandeurs des schémas
d’équivalence des circuits pour moteurs à induction à cage basse tension
triphasés
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IEC 60034-28 ®
Edition 2.0 2012-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Rotating electrical machines –

Part 28: Test methods for determining quantities of equivalent circuit diagrams

for three-phase low-voltage cage induction motors

Machines électriques tournantes –

Partie 28: Méthodes d’essai pour la détermination des grandeurs des schémas

d’équivalence des circuits pour moteurs à induction à cage basse tension

triphasés
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 29.160 ISBN 978-2-83220-553-2

– 2 – 60034-28 © IEC:2012
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, symbols and conventions . 7
3.1 Terms and definitions . 7
3.2 Symbols . 8
3.3 Subscripts . 9
3.4 Winding connection . 9
4 Test requirements . 10
4.1 General . 10
4.2 Frequency and voltage . 10
4.3 Instrumentation . 10
4.3.1 Measuring instruments for electrical quantities, speed and frequency . 10
4.3.2 Instrument transformers . 10
4.3.3 Temperature measurement . 10
5 Approximations and uncertainties . 10
6 Test procedures . 11
6.1 General . 11
6.2 Stator d.c. line-to-line resistance measurement . 11
6.3 Load-test at rated load . 11
6.4 Load curve test. 12
6.5 No-load test . 12
6.6 Reverse rotation and locked rotor tests . 13
6.6.1 General . 13
6.6.2 Reverse rotation test . 13
6.6.3 Locked rotor test. 13
7 Determination of motor quantities . 13
7.1 General . 13
7.2 Resistance of stator winding R . 15
s
7.3 Total stator inductance L = L + L . 15
ts m σs
7.3.1 General . 15
7.3.2 Determination procedure . 15
7.4 Equivalent resistance of iron losses R . 16
feΓ
7.4.1 Constant losses . 16
7.4.2 Friction and windage losses. 17
7.4.3 Iron losses . 17
7.5 Total leakage inductance L . 18
tσ
7.5.1 General . 18
7.5.2 Distribution of leakage inductances between stator and rotor. 18
7.5.3 Determination of total leakage inductance from a reverse rotation or
locked rotor test (6.6) . 18
7.5.4 Determination of total leakage inductance from a load curve test (6.4) . 20
7.6 Magnetizing inductance L and voltage U . 21
m m
7.6.1 From a reverse rotation or locked rotor test (6.6) . 21
7.6.2 From a load curve test (6.4) . 21

60034-28 © IEC:2012 – 3 –
7.7 Stator and rotor leakage inductances L and L ’ . 22
σs σr
7.7.1 From a reverse rotation or locked rotor test (6.6) . 22
7.7.2 From a load curve test (6.4) . 22
7.8 Inductances for calculations at constant flux (rated load) . 22
7.9 Resistance of rotor cage R ’ referred to the stator winding and frequency . 23
r
7.10 Equivalent resistance of iron losses R . 25
fe
Annex A (informative) Sample calculation . 26

Figure 1 – Type-T equivalent circuit diagram . 14
Figure 2 – Type-T equivalent circuit diagram (iron losses disregarded) . 14
Figure 3 – Type-L equivalent circuit diagram (iron losses disregarded) . 14
Figure 4 – Type-Γ equivalent circuit diagram. 15
Figure 5 – Typical characteristics of inductance L over current I . 16

– 4 – 60034-28 © IEC:2012
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –

Part 28: Test methods for determining quantities of equivalent circuit
diagrams for three-phase low-voltage cage induction motors

FOREWORD
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