IEC TS 60034-24:2009

IEC/TS 60034-24 ®
Edition 1.0 2009-09
TECHNICAL
SPECIFICATION
SPÉCIFICATION
TECHNIQUE
Rotating electrical machines –
Part 24: Online detection and diagnosis of potential failures at the active parts of
rotating electrical machines and of bearing currents – Application guide

Machines électriques tournantes –
Partie 24: Détection et diagnostic en ligne de défaillances potentielles des
parties actives de machines électriques tournantes et de courants de palier –
Guide d'application
IEC/TS 60034-24:2009
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IEC/TS 60034-24 ®
Edition 1.0 2009-09
TECHNICAL
SPECIFICATION
SPÉCIFICATION
TECHNIQUE
Rotating electrical machines –
Part 24: Online detection and diagnosis of potential failures at the active parts of
rotating electrical machines and of bearing currents – Application guide

Machines électriques tournantes –
Partie 24: Détection et diagnostic en ligne de défaillances potentielles des
parties actives de machines électriques tournantes et de courants de palier –
Guide d'application
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
S
CODE PRIX
ICS 29.160 ISBN 978-2-88910-021-7
– 2 – TS 60034-24 © IEC:2009
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.6
2 Normative references .6
3 Terms and definitions .6
4 Basis of the diagnosis .7
5 Kinds of electrical signal analysis .10
5.1 General remarks.10
5.2 Stator current/voltage analysis .10
5.3 Induced voltages of auxiliary turns embedded into the stator slots or other
magnetic sensors sensing the air-gap flux .11
5.4 Induced voltages of search coils collecting axial fluxes.14
5.5 Shaft voltage analysis .14
6 Detection of bearing currents.14
Bibliography.16

Table 1 – Most important magnetic fields in the air-gap of a three-phase cage induction
motor with an integral slot stator winding under normal operating and fault conditions .8
Table 2 – Diagnosis of failures at a cage induction motor, equipped with two identical
auxiliary coil systems.13

TS 60034-24 © IEC:2009 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –

Part 24: Online detection and diagnosis of potential failures
at the active parts of rotating electrical machines
and of bearing currents –
Application guide
FOREWORD
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The main task of IEC technical committees is to prepare International Standards. In
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• the required support cannot be obtained for the publication of an International Standard,
despite repeated efforts, or
• The subject is still under technical development or where, for any other reason, there is
the future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC 60034-24, which is a technical specification, has been prepared by IEC technical
committee 2: Rotating machinery.

– 4 – TS 60034-24 © IEC:2009
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
2/1537/DTS 2/1553A/RVC
Full information on the voting for the approval of this technical specification can be found in
the report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
NOTE A table of cross-references of all IEC TC 2 publications can be found in the IEC TC 2 dashboard on the
IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
TS 60034-24 © IEC:2009 – 5 –
INTRODUCTION
Progress in design and technology has resulted in an increasing reliability of rotating
electrical machines, but failures could not be eliminated completely. Since the demand for a
high availability is permanently increasing, it is essential to detect deficiencies at an early
stage and to recognize the origin and identify the severity of the fault in order to estimate the
risk of a continuation of operation.
It would be advantageous, if the signals which are obtained by the detection methods
presented in this guide, were suitable to distinguish the different failures from each other. By
this means, the signal analysis can be used as input data of a complete monitoring system.
The aim of this guide is to present possible tools which are available for the intended purpose
and to explain their advantages and disadvantages. The minimum requirements which shall
be met by the various sensors will be discussed, whereas the detailed design rules are
outside the scope of this technical specification.
This guide deals with the detection of failures at the active parts of multi-phase rotating
machines (all kinds of winding faults in stator and rotor, cage deficiencies, eccentricities) and
of bearing currents.
– 6 – TS 60034-24 © IEC:2009
ROTATING ELECTRICAL MACHINES –

Part 24: Online detection and diagnosis of potential failures
at the active parts of rotating electrical
...