Rotating electrical machines - Part 19: Specific test methods for d.c. machines on conventional and rectifier-fed supplies

IEC 60034-19:2014 applies to d.c. machines rated 1 kW and above operating on rectifier-fed power supplies, d.c. buses or other d.c. sources and provides standardized methods intended to determine characteristic quantities for conventional and rectifier-fed d.c. machines. These methods supplement the requirements in IEC 60034-1 and IEC 60034-2-1. The main changes with regard to the previous edition are as follows: - description of the procedure for black band testing has been detailed and clarified; - procedures for measurement of the magnetization curves under no-load and load conditions have been added.

Drehende elektrische Maschinen - Teil 19: Besondere Prüfverfahren für Gleichstrommaschinen, betrieben an gleichrichtergespeisten Leistungsversorgungen oder anderen Gleichstromquellen

Machines électriques tournantes - Partie 19: Méthodes spécifiques d'essai pour machines à courant continu à alimentation conventionnelle ou redressée

L'IEC 60034-19:2014 s'applique aux machines à courant continu de puissance assignée égale ou supérieure à 1 kW, alimentées par des redresseurs, des barres omnibus pour courant continu (bus c.c.) ou d'autres sources de courant continu et fournit des méthodes normalisées destinées à la détermination des grandeurs caractéristiques des machines à courant continu conventionnelles et alimentées par redresseur. Ces méthodes complètent les exigences contenues dans l'IEC 60034-1 et l'IEC 60034-2-1. Les principales modifications par rapport à l'édition précédente sont les suivantes: - la description de la procédure relative aux essais de bande noire a été détaillée et clarifiée; - des procédures de mesure des courbes d'aimantation dans les conditions à vide ou en charge ont été ajoutées.

Električni rotacijski stroji - 19. del: Posebne metode za preskušanje enosmernih strojev s konvencionalnim (enosmernim) in usmerjenim napajanjem (IEC 60034-19:2014)

Ta del standarda IEC 60034 velja za stroje na enosmerni tok z močjo 1 kW ali več z usmerjenim napajanjem, enosmernimi odvodniki ali drugimi enosmernimi viri.
Podane so standardizirane metode za določanje značilnih količin pri konvencionalnem (enosmernem) in usmerjenem napajanju.
Stroji na enosmerni tok za posebne aplikacije so izključeni.
Te metode dopolnjujejo zahteve standardov IEC 60034-1 in IEC 60034-2-1.
OPOMBA Ta standard ni namenjen interpretaciji, da je nujno izvesti katerega koli ali vse v njem opisane preskuse na katerem koli stroju.

General Information

Status
Published
Publication Date
20-Nov-2014
Technical Committee
Drafting Committee
Current Stage
6060 - Document made available
Due Date
21-Nov-2014
Completion Date
21-Nov-2014

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SLOVENSKI STANDARD
SIST EN 60034-19:2015
01-april-2015
(OHNWULþQLURWDFLMVNLVWURMLGHO3RVHEQHPHWRGH]DSUHVNXãDQMHHQRVPHUQLK
VWURMHYVNRQYHQFLRQDOQLP HQRVPHUQLP LQXVPHUMHQLPQDSDMDQMHP ,(&


Rotating electrical machines - Part 19: Specific test methods for d.c. machines on

conventional and rectifier-fed supplies (IEC 60034-19:2014)
Drehende elektrische Maschinen - Teil 19: Besondere Prüfverfahren für
Gleichstrommaschinen, betrieben an gleichrichtergespeisten Leistungsversorgungen
oder anderen Gleichstromquellen (IEC 60034-19:2014)
Machines électriques tournantes - Partie 19: Méthodes spécifiques d'essai pour

machines à courant continu à alimentation conventionnelle ou redressée (IEC 60034-

19:2014)
Ta slovenski standard je istoveten z: EN 60034-19:2014
ICS:
29.160.01 Rotacijski stroji na splošno Rotating machinery in
general
SIST EN 60034-19:2015 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60034-19:2015
---------------------- Page: 2 ----------------------
SIST EN 60034-19:2015
EUROPEAN STANDARD EN 60034-19
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2014
ICS 29.160
English Version
Rotating electrical machines - Part 19: Specific test methods for
d.c. machines on conventional and rectifier-fed supplies
(IEC 60034-19:2014)

Machines électriques tournantes - Partie 19: Méthodes Drehende elektrische Maschinen - Teil 19: Besondere

spécifiques d'essai pour machines à courant continu à Prüfverfahren für Gleichstrommaschinen, betrieben an

alimentation conventionnelle ou redressée gleichrichtergespeisten Leistungsversorgungen oder

(CEI 60034-19:2014) anderen Gleichstromquellen
(IEC 60034-19:2014)

This European Standard was approved by CENELEC on 2014-10-30. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 60034-19:2014 E
---------------------- Page: 3 ----------------------
SIST EN 60034-19:2015
EN 60034-19:2014 - 2 -
Foreword

The text of document 2/1756/FDIS, future edition 2 of IEC 60034-19, prepared by IEC/TC 2 "Rotating

machinery" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as

EN 60034-19:2014.
The following dates are fixed:
(dop) 2015-07-30
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2017-10-30
• latest date by which the national standards conflicting with
the document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such

patent rights.
Endorsement notice

The text of the International Standard IEC 60034-19:2014 was approved by CENELEC as a European

Standard without any modification.
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SIST EN 60034-19:2015
- 3 - EN 60034-19:2014
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod),

the relevant EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is

available here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60034-1 - Rotating electrical machines - EN 60034-1 -
Part 1: Rating and performance
IEC 60034-2-1 - Rotating electrical machines - EN 60034-2-1 -
Part 2-1: Standard methods for determining
losses and efficiency from tests (excluding
machines for traction vehicles)
---------------------- Page: 5 ----------------------
SIST EN 60034-19:2015
---------------------- Page: 6 ----------------------
SIST EN 60034-19:2015
IEC 60034-19
Edition 2.0 2014-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines –
Part 19: Specific test methods for d.c. machines on conventional and
rectifier-fed supplies
Machines électriques tournantes –
Partie 19: Méthodes spécifiques d'essai pour machines à courant continu à
alimentation conventionnelle ou redressée
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX S
ICS 29.160 ISBN 978-2-8322-1861-7

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 60034-19:2015
– 2 – IEC 60034-19:2014 © IEC 2014
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms, definitions, symbols and subscripts ...................................................................... 6

3.1 Terms and definitions .............................................................................................. 6

3.2 Symbols .................................................................................................................. 7

3.3 Subscripts ............................................................................................................... 7

4 Determination of current and voltage specific quantities (rectifier-fed) ............................. 7

4.1 General ................................................................................................................... 7

4.2 Current ripple .......................................................................................................... 7

4.3 Voltage ripple.......................................................................................................... 8

4.4 Measurement of average values ............................................................................. 8

4.5 Measurement of root-mean-square values .............................................................. 8

4.6 Calculation of current and voltage ripple factors and form factor ............................. 8

5 Determination of the armature circuit inductance ............................................................. 8

5.1 Procedure performed before starting the tests ........................................................ 8

5.2 Measurement of armature circuit inductance of shunt and compound-wound

machines ................................................................................................................ 8

5.3 Measurement of armature circuit inductance of series-excited machine .................. 9

5.4 Calculation of armature circuit inductance L on the basis of direct

measurement .......................................................................................................... 9

5.5 Saturated armature circuit inductance at a loaded condition .................................... 9

6 Determination of shunt-field inductance ......................................................................... 10

6.1 General ................................................................................................................. 10

6.2 Unsaturated shunt-field inductance ....................................................................... 10

6.3 Saturated shunt-field inductance ........................................................................... 10

6.4 Shunt-field inductance with consideration of eddy current effect ........................... 10

6.5 Shunt-field inductance without consideration of eddy current effect ....................... 11

7 Determination of black-band zone.................................................................................. 12

7.1 General ................................................................................................................. 12

7.2 Set-up ................................................................................................................... 12

7.3 Test procedure ...................................................................................................... 13

7.3.1 Operating conditions ...................................................................................... 13

7.3.2 Determination of the minimum current of the commutating winding ................ 14

7.3.3 Determination of the maximum current of the commutating winding ............... 14

7.4 Calculation of black-band width (∆ ) and black-band shift (δ ) .............................. 14

n n

8 Determination of the maximum permissible rate of change of armature current .............. 15

8.1 General ................................................................................................................. 15

8.2 Set-up ................................................................................................................... 15

8.3 Test procedure ...................................................................................................... 16

8.3.1 Operating conditions ...................................................................................... 16

8.3.2 Measuring the rise of armature current .......................................................... 16

8.4 Calculation of initial rate of change of armature current ........................................ 16

9 Additional losses and efficiency of rectifier-fed d.c. motors ............................................ 17

9.1 General ................................................................................................................. 17

9.2 Measurement procedure ....................................................................................... 17

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SIST EN 60034-19:2015
IEC 60034-19:2014 © IEC 2014 – 3 –

9.3 Calculation of efficiency ........................................................................................ 18

10 Determination of speed regulation ................................................................................. 18

10.1 General ................................................................................................................. 18

10.2 Operating conditions ............................................................................................. 18

10.3 Test procedure ...................................................................................................... 18

10.4 Determination of speed regulation ......................................................................... 18

11 Determination of the shunt regulation curve ............................................................. 18

11.1 General ............................................................................................................... 18

11.2 Operating conditions ............................................................................................. 19

11.3 Test procedure ...................................................................................................... 19

11.4 Determination of the shunt regulation curve .......................................................... 19

12 Determination of the magnetisation curve ...................................................................... 19

12.1 General ................................................................................................................. 19

12.2 Operating conditions ............................................................................................. 19

12.3 Test procedure ...................................................................................................... 19

12.3.1 General ......................................................................................................... 19

12.3.2 Test at no-load .............................................................................................. 19

12.3.3 Test at rated load ........................................................................................ 20

12.4 Determination of the magnetisation curve ............................................................. 20

Figure 1 – Determination of saturated armature circuit inductance .......................................... 9

Figure 2 – Test circuit for saturated shunt field inductance measurement ............................. 10

Figure 3 – Determination of the field inductance ................................................................... 11

Figure 4 – Test circuit for black-band testing ......................................................................... 12

Figure 5 – Additional generator used to boost or subtract the armature current ..................... 13

Figure 6 – Black-band zone for a specified constant speed of rotation .................................. 14

Figure 7 – Test circuit for rate of change of armature current measurement .......................... 15

Figure 8 – Transient build-up of armature current ................................................................. 16

Figure 9 – Test circuit for measurement of ripple losses ....................................................... 17

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SIST EN 60034-19:2015
– 4 – IEC 60034-19:2014 © IEC 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –
Part 19: Specific test methods for d.c. machines
on conventional and rectifier-fed supplies
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60034-19 has been prepared by IEC technical committee 2:

Rotating machinery.

This second edition cancels and replaces the first edition published in 1995. It constitutes a

technical revision. The main technical changes with regard to the previous edition are as

follows:

a) The description of the procedure for black band testing has been detailed and clarified.

b) Procedures for measurement of the magnetization curves under no-load and load
conditions have been added.
---------------------- Page: 10 ----------------------
SIST EN 60034-19:2015
IEC 60034-19:2014 © IEC 2014 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
2/1756/FDIS 2/1764/RVD

Full information on the voting for the approval of this standard 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 on the IEC TC 2 dashboard on the

IEC website.

The committee has decided that the contents of this publication will remain unchanged until

the stability 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
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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SIST EN 60034-19:2015
– 6 – IEC 60034-19:2014 © IEC 2014
ROTATING ELECTRICAL MACHINES –
Part 19: Specific test methods for d.c. machines
on conventional and rectifier-fed supplies
1 Scope

This part of IEC 60034 applies to d.c. machines rated 1 kW and above operating on rectifier-

fed power supplies, d.c. buses or other d.c. sources.

Standardized methods are provided for determining characteristic quantities for conventional

and rectifier-fed d.c. machines.
Excluded are d.c machines for specific applications.
These methods supplement the requirements in IEC 60034-1 and IEC 60034-2-1.

NOTE It is not intended that this standard should be interpreted as requiring the carrying out of any or all of the

tests described therein on any given machine.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60034-1, Rotating electrical machines – Part 1: Rating and performance

IEC 60034-2-1, Rotating electrical machines – Part 2-1: Standard methods for determining

losses and efficiency from tests (excluding machines for traction vehicles)
3 Terms, definitions, symbols and subscripts
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
current ripple
peak-to-peak amplitude of the armature current of rectifier-fed d.c. machines
3.1.2
voltage ripple
peak-to-peak amplitude of the terminal voltage of rectifier-fed d.c. machines
3.1.3
time constant

time to achieve 63,2 % of steady-state value after applying a d.c. step input, assuming a first

order system
---------------------- Page: 12 ----------------------
SIST EN 60034-19:2015
IEC 60034-19:2014 © IEC 2014 – 7 –
3.1.4
black band zone

interval between the current limits of the commutating poles, between which sparkless

commutation is attainable for load currents up to and including rated current
3.1.5
sparkless
absence of any type of sparking
3.2 Symbols
C is the capacitance, [F]
f is the frequency, [Hz]
I, i is the current, [A]
L is the inductance, [H]
n is the speed, [min ]
P is the power, [W]
R is the winding resistance, [Ω]
t is the time, [s]
U is the voltage, [V]
Δ is the black band width, [%]
δ is the black band shift, [%]
𝜏 is the time constant, [s]
θ is the phase angle
3.3 Subscripts
1 input
2 output
a armature
b boost
e exciter
f field
LL additional loss
n test point
N rated condition
s subtract
0 no-load
∞ ultimate
4 Determination of current and voltage specific quantities (rectifier-fed)
4.1 General

This test serves to determine the variation of the terminal voltage and armature current for

rectifier-fed d.c. machines at rated conditions.
4.2 Current ripple

The armature current ripple is best measured with an oscilloscope incorporating capability for

reading both d.c. and a.c. values. An alternative method is to use a peak-to-peak reading

---------------------- Page: 13 ----------------------
SIST EN 60034-19:2015
– 8 – IEC 60034-19:2014 © IEC 2014

voltmeter, reading the voltage drop across a non-inductive resistor in series with the armature

circuit.
4.3 Voltage ripple

The voltage ripple may be measured using an oscilloscope, a suitable oscillograph or an

electronic peak-to-peak indicating voltmeter in series with an appropriate blocking capacitor of

sufficient size not to affect the a.c. readings.

It should be noted that in measuring the peak-to-peak value, deviations from the main

waveform due to high frequency spikes should be ignored.
4.4 Measurement of average values

In the case of rectifier supply, the average d.c. values of armature voltage and current can be

measured using permanent-magnet moving-coil type instruments, or other instruments

including digital instrumentation known to provide true average readings.
4.5 Measurement of root-mean-square values

Root-mean-square values can be measured using electrodynamometer type, moving-iron

type, or other instruments including digital instrumentation known to provide true r.m.s.

readings. AC instrumentation of the type using rectifiers to sense only a portion of the voltage

or current signal and instruments whose calibration is based on the assumption of a

sinusoidal waveform shall not be used. Oscilloscope readings of the voltage and current

signals are recommended.
4.6 Calculation of current and voltage ripple factors and form factor

The current ripple factors and the form factor shall be calculated using the formulas of

IEC 60034-1, with maximum, minimum, average and r.m.s. waveform values measured

according to 4.2 to 4.5 of this part. The voltage ripple factor shall be calculated similar to the

current ripple factor.
5 Determination of the armature circuit inductance
5.1 Procedure performed before starting the tests

It is recommended to measure the armature circuit inductance by applying a single phase

50 Hz or 60 Hz alternating current to the armature circuit terminals of the machine. The rotor

shall be locked to prevent rotation. Normal carbon brushes can be used if the alternating

current is limited to approximately 20 % of the current rating of the machine to avoid

overheating of the brushes or of the commutator during the short tests. The brushes shall be

completely in contact with the commutator surface and inspected before the test is started

and after the test is finished.

In declaring values of inductance it shall be stated whether the value refers to the saturated or

unsaturated condition.

Measure and record the r.m.s. value of voltage U, current I, frequency f and the phase angle θ

between voltage and current. The phase angle may be determined using suitable means such

as an oscilloscope or a phasemeter, or by an indirect method, e.g. using a wattmeter.

5.2 Measurement of armature circuit inductance of shunt and compound-wound
machines

The armature circuit inductance of shunt and compound-wound machines is to be measured

for both unsaturated and saturated conditions.
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SIST EN 60034-19:2015
IEC 60034-19:2014 © IEC 2014 – 9 –

For the unsaturated test the shunt-field winding shall be short-circuited to avoid high voltages

being induced in the winding. For the saturated test the shunt field is excited as for rated

operation from a d.c. power supply, having a current ripple not exceeding 6 %.
5.3 Measurement of armature circuit inductance of series-excited machine

The test on a series-excited machine is to be done for the saturated condition only. This test

shall be carried out with the series-field winding separately excited at rated current using a

d.c. power supply having a current ripple factor not exceeding 6 %.

The saturated inductance, so determined, does not include the inductance contributed by the

series-field which shall be determined as described in 6.3 for the saturated shunt-field test.

5.4 Calculation of armature circuit inductance L on the basis of direct measurement

The armature inductance L is given by:
𝑈∙ sin𝜃
𝐿 =
2𝜋∙𝑓∙𝐼
where U, I, f and θ are determined according to 5.1.
5.5 Saturated armature circuit inductance at a loaded condition

To determine the saturated armature circuit inductance under load, the machine to be tested

shall be operated as a generator at about the specified load current, and an a.c. current of

about 20 % of the rated current shall be superposed on the d.c. load current by using an a.c.

generator, a capacitor C and an inductor L, as shown in Figure 1.
AC generator
Machine to be
tested
G V
Load
Commutating and
compensating
windings
Frequency analyser,
oscillograph for
measurement of U, I, θ
IEC
Figure 1 – Determination of saturated armature circuit inductance

The armature circuit inductance is calculated by the same formula as that in 5.4, using the

r.m.s. values of a.c. voltage U and a.c. current I.
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SIST EN 60034-19:2015
– 10 – IEC 60034-19:2014 © IEC 2014
6 Determination of shunt-field inductance
6.1 General

The shunt-field inductance is to be determined from the rate of rise of shunt-field current upon

abrupt application of voltage to the shunt-field terminals. The effective shunt-field inductance

is calculated from the rate of rise of direct-axis flux as indicated by the armature voltage

appearing at the brushes. During the test the machine is driven at rated full-field speed with

the armature open-circuited. The test is to be done for both unsaturated and saturated

conditions.

In declaring values of inductance it shall be stated whether the value refers to the saturated or

unsaturated condition.
6.2 Unsaturated shunt-field inductance

To find the unsaturated inductance, the shunt-field shall be excited from a voltage source

having a regulation at rated full-field excitation of the test machine of less than 2 %. The

shunt-field voltage is slowly cycled twice between the value yielding rated armature voltage

and zero, and then the armature voltage is reduced to approximately 50 % of rated value.

After recordin
...

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