IEC 62505-3-3:2009

Railway applications - Fixed installations - Particular requirements for a.c. switchgear - Part 3-3: Measurement, control and protection devices for specific use in a.c. traction systems - Single-phase inductive voltage transformers

IEC 62505-3-3:2009 gives particular requirements for voltage transformers used in a.c. single-phase railway applications, fixed installations. Applies to inductive voltage transformers used at traction voltages and frequencies according to IEC 60850.

Applications ferroviaires - Installations fixes - Exigences particulières pour appareillage à courant alternatif - Partie 3-3: Dispositifs de mesure, de commande et de protection pour usage spécifique dans les systèmes de traction à courant alternatif - Transformateurs inductifs de tension monophasés

La CEI 62505-3-3:2009 donne les exigences particulières relatives aux transformateurs de tension monophasés utilisés dans les installations fixes des réseaux ferroviaires à courant alternatif. S'applique aux transformateurs de tension inductifs utilisés aux tensions et fréquences de traction conformes à la CEI 60850.

General Information

• Status: Published
• Publication Date: 09-Mar-2009
• ICS: 45.060.01 - Railway rolling stock in general
• Technical Committee: TC 9 - Electrical equipment and systems for railways
• Current Stage: DELPUB - Deleted Publication
• Start Date: 31-Dec-2018
• Completion Date: 20-Jan-2020

Relations

• Revised: IEC 62505-3-3:2020 - Railway applications - Fixed installations - Particular requirements for AC switchgear - Part 3-3: Measurement, control and protection devices for specific use in AC traction systems - Voltage transformers
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62505-3-3


®

Edition 1.0 2009-03



INTERNATIONAL



STANDARD



NORME
INTERNATIONALE


Railway applications – Fixed installations – Particular requirements for a.c.
switchgear –
Part 3-3: Measurement, control and protection devices for specific use in a.c.
traction systems – Single-phase inductive voltage transformers

Applications ferroviaires – Installations fixes – Exigences particulières pour
appareillage à courant alternatif –
Partie 3-3: Dispositifs de mesure, de commande et de protection pour usage
spécifique dans les systèmes de traction à courant alternatif – Transformateurs
inductifs de tension monophasés


IEC 62505-3-3:2009

---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED


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All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by

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IEC 62505-3-3


®

Edition 1.0 2009-03



INTERNATIONAL



STANDARD



NORME
INTERNATIONALE


Railway applications – Fixed installations – Particular requirements for a.c.
switchgear –
Part 3-3: Measurement, control and protection devices for specific use in a.c.
traction systems – Single-phase inductive voltage transformers

Applications ferroviaires – Installations fixes – Exigences particulières pour
appareillage à courant alternatif –
Partie 3-3: Dispositifs de mesure, de commande et de protection pour usage
spécifique dans les systèmes de traction à courant alternatif – Transformateurs
inductifs de tension monophasés


INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
K
CODE PRIX
ICS 45.060 ISBN 978-2-88910-749-0
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – 62505-3-3 © IEC:2009



CONTENTS

FOREWORD.3


INTRODUCTION.5

1 Scope.6

2 Normative references .6


3 Terms and definitions .6

4 Service conditions .7

5 Characteristics and use .7

6 Rating and design requirements .7
7 Withstand conditions .7
7.1 Primary side .7
7.2 Secondary side .7
8 Ferro-resonance.8
8.1 General .8
8.2 Prevention of the generation .8
8.3 Prevention of damages in the voltage transformer .8
8.4 Ferro-resonance withstand test .8
9 Particular design and construction characteristics .8
9.1 Pollution.8
9.2 External flashover test.8
9.3 Floating potentials and earthing.9
9.4 Electromagnetic compatibility .9
9.5 Secondary connection box .9
9.6 Information to be given by the purchaser.9
9.7 Information to be given by the supplier .9
10 Tests – General.9
11 Other requirements.10

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62505-3-3 © IEC:2009 – 3 –


INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________



RAILWAY APPLICATIONS –

FIXED INSTALLATIONS –

PARTICULAR REQUIREMENTS FOR AC SWITCHGEAR –



Part 3-3: Measurement, control and protection devices

for specific use in a.c. traction systems –

Single-phase inductive voltage transformers



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
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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 62505-3-3 has been prepared by IEC technical committee 9:
Electrical equipment and systems for railways. This standard is based on EN 50152-3-3.
The text of this standard is based on the following documents:
FDIS Report on voting
9/1223/FDIS 9/1236/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.

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A list of all parts of IEC 62505 series, under the general title Railway applications – Fixed

installations – Particular requirements for a.c. switchgear, can be found 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


• reconfirmed,

• withdrawn,

• replaced by a revised edition, or

• amended.

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62505-3-3 © IEC:2009 – 5 –


INTRODUCTION


Part 3 of IEC 62505, “Railway applications – Fixed installations – Particular requirements for

a.c. switchgear", concerning the measurement, control and protection devices for specific use

in a.c. traction systems, comprises:


IEC 62505-3-1: Application guide (informative document)

IEC 62505-3-2: Single-phase current transformers (normative document)

IEC 62505-3-3: Single-phase inductive voltage transformers (normative document)

This Standard applies to inductive voltage transformers used at traction voltages and

frequencies according to IEC 60850.
The requirements contained in this Standard complement those given in IEC 60044-2:1997.

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– 6 – 62505-3-3 © IEC:2009


RAILWAY APPLICATIONS –

FIXED INSTALLATIONS –

PARTICULAR REQUIREMENTS FOR AC SWITCHGEAR –



Part 3-3: Measurement, control and protection devices

for specific use in a.c. traction systems –

Single-phase inductive voltage transformers







1 Scope
This part of IEC 62505 gives particular requirements for voltage transformers used in a.c.
single-phase railway applications, fixed installations.
This International Standard applies to inductive voltage transformers used at traction voltages
and frequencies according to IEC 60850.
The main uses of these voltage transformers are:
− voltage indication;
− measurement;
− protection.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60044-2:1997, Instrument transformers – Part 2: Inductive voltage transformers
IEC 60529:2001, Degrees of protection provided by enclosures (IP Code)
IEC 60850, Railway applications – Supply voltages of traction systems
IEC 62236-5, Railway applications – Electromagnetic compatibility – Part 5: Emission and

immunity of fixed power supply installations and apparatus
IEC 62497-1, Railway applications – Insulation coordination – Part 1: Basic requirements –
Clearances and creepage distances for all electrical and electronic equipment
IEC 62505 (all parts), Railway applications – Fixed installations – Particular requirements for
a.c. switchgear
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62505-1, Clause 3
and in IEC 60044-2:1997, Clause 2, apply.

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62505-3-3 © IEC:2009 – 7 –


4 Service conditions


Where the equipment described in this part of the standard is mounted on circuit breakers to

IEC 62505-1, then the service conditions of that standard apply. Where they are separately

mounted and are used in association with switchgear then the same service conditions as the

switchgear apply.



5 Characteristics and use


The voltage transformer shall be:

a) either mounted inside the circuit breaker specified in IEC 62505-1; technical requirements
of this IEC 62505-3-3 apply together with the construction and test requirements (as
applicable) of IEC 62505-1;
b) or separately mounted, free standing; technical requirements of this IEC 62505-3-3 apply.
6 Rating and design requirements
Clauses 5 and 6 of IEC 60044-2:1997 apply with the following exceptions:
− In subclause 5.1.2 the following shall be added at the end of the subclause:
The secondary voltage values of 100 V or 110 V shall be preferred.
The rated ratio is given by the primary nominal voltage, as defined in IEC 60850, divided
by the rated secondary voltage.
− In Clause 6 the entire subclause 6.1.1 shall be replaced by:
6.1.1 Rated insulation levels for the primary winding
Voltage transformers covered by this standard shall have the same insulation ratings and
test values as the equipment into which they are installed. See Table 1 of IEC 62505-1
and IEC 62505-2. Free standing voltage transformers shall meet the same requirements.
− Subclause 6.1.5 of IEC 60044-2 is valid unless inconsistent with 9.1 of this International
Standard.
7 Withstand conditions
The following requirements, additional to those of IEC 60044-2:1997, apply:
7.1 Primary side

The voltage transformer shall withstand the overvoltage characteristics described in
IEC 60850, Annex A.
NOTE These events occur often and special attention should be paid to protect these voltage transformers.
7.2 Secondary side
The voltage transformer shall withstand the current produced in secondary winding for 1 s,
when its terminals are short circuited. The primary voltage shall be U for this condition.
max2
Where no U value is specified, U shall be used.
max2 max1
NOTE A rapid fuse or a miniature circuit breaker may be inserted at the load. On request, a slow-blow low-voltage
fuse should be inserted between secondary winding and secondary terminals.

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8 Ferro-resonance


8.1 General


The following requirements, additional to those of IEC 60044-2:1997, apply:


The structure of railway electrification network may easily generate ferro-resonance

phenomena. They occur mainly in 25 kV, 50 Hz systems.


When specified by the purchaser, the voltage transformer connected directly to the overhead

line shall have the following characteristics in order to avoid the generation of ferro-resonance

phenomena and withstand the overvoltages caused by the same.
8.2 Prevention of the generation
The following features shall be adopted:
− minimum resistance of the primary winding: shall be specified by the purchaser;
NOTE Typical resistance values are between 15 kΩ and 50 kΩ.
− flux density such that at U (see IEC 60850) the saturation point is not reached.
max2
8.3 Prevention of damages in the voltage transformer
The following features shall be adopted:
− ability to withstand without damage on the primary side a voltage wave obtained by
summing a sinusoidal wave at rated frequency with a square wave at 1/3 of the rated
frequency, with a total peak value of approximately 1,6 × U ;
n
− suitability to operate continuously at 1/3 of the rated frequency and rated voltage;
− voltage factor of 1,9 (1,9 × U for 8 h at rated frequency).
n
8.4 Ferro-resonance withstand test
The voltage transformer will be considered suitable to withstand ferro-resonance if these
characteristics are checked and tested, as a special type test named ferro-resonance
withstand test. This consists of a temperature-rise test at rated voltage, rated burden and 1/3
of rated frequency. The standard temperature rises shall not be exceeded.
9 Particular design and construction characteristics

The following requirements, additional to those of IEC 60044-2:1997, apply:
9.1 Pollution
The dust pollution on railway tracks (e.g. in tunnels and at the seaside) is often higher than on
high voltage transmission lines. For this reason the creepage distance shall not be less than
indicated in IEC 62497-1, Table A.7, for the appropriate pollution degree.
NOTE For the choice of the appropriate pollution degree, the degrees used in the associated switchgear (see
IEC 62505-1 and IEC 62505-2) should be taken into account.
9.2 External flashover test
When specified by the purchaser, outdoor units shall be able to withstand an external
flashover of the primary bushing and be capable of continued service. This will be tested as a
special type test named the external flashover test by repeating dielectric, partial discharge
and accuracy tests after a flashover. The flashover is made by creating a permanent

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62505-3-3 © IEC:2009 – 9 –


conduction on the creepage distance of the insulator. The voltage applied shall be U the
max1

resulting fault current being maintained for 100 ms up to the following values:


− for 15 kV systems 50 kA r.m.s.;

− for 25 kV systems 16 kA r.m.s.


9.3 Floating potentials and earthing


No metallic part of the voltage transformer shall be left at floating potential. The earthing
connection shall be able to carry the rated short time withstand current for a duration of 1 s.



9.4 Electromagnetic compatibility
The voltage transformer shall comply with IEC 62236-5 for electromagnetic compatibility.
9.5 Secondary connection box
The secondary connection box of outdoor voltage transformers shall have a minimum
protection degree IP 54 in accordance with IEC 60529.
9.6 Information to be given by the purchaser
The purchaser shall provide the following information:
− location of the voltage transformer (e.g. on a pole or mast, in a cabinet, on the floor indoor
or outdoor);
− type of primary connection;
− special material and form for connections, if necessary;
− rated voltage of the primary side;
− rated voltage of the secondary side;
− rated value of the output;
− accuracy class of the voltage transformer;
− ferro-resonance requirements, if any;
− indication of the insulation level (U , U , U - see IEC 62497-1).
N N
m i a
9.7 Information to be given by the supplier
The supplier shall provide the following information:
− variation of the actual transformation ratio of the voltage transformer in function of the

frequency in the range from rated frequency to 1 kHz (if required);
− weight;
− dimensions;
− characteristics of the internal protection (see note of 7.2), if applicable.
10 Tests – General
Clause 7 of IEC 60044-2:1997 applies with the following addition:
Add in subclause 7.3 (Special tests) the following two points:
d) ferro-resonance withstand test (see 8.1),
e) external flashover test (see 9.2).

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11 Other requirements


The remaining Clauses of IEC 60044-2:1997 from 8 to 13 apply, unless they are inconsistent

with the above requirements and with the character of single-phase inductive voltage

transformers in a.c traction systems.





___________

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SOMMAIRE

AVANT-PROPOS.13


INTRODUCTION.15

1 Domaine d’application .16

2 Références normatives.16


3 Termes et définitions .17

4 Conditions de service .17

5 Caractéristiques et utilisation .17

6 Caractéristiques assignées et exigences de conception .17
7 Conditions de tenue .17
7.1 Primaire du transformateur .17
7.2 Secondaire du transformateur .18
8 Ferro-résonance.18
8.1 Généralités.18
8.2 Prévention de l’apparition.18
8.3 Prévention des dommages au transformateur de tension.18
8.4 Essai de tenue à la ferro-résonance .18
9 Conception particulière et caractéristiques de construction.18
9.1 Pollution.19
9.2 Essai de contournement extérieur .19
9.3 Potentiels flottants et mise à la terre .19
9.4 Compatibilité électromagnétique.19
9.5 Boîtier de connexions du secondaire .19
9.6 Renseignements à communiquer par l’acheteur .19
9.7 Renseignements à communiquer par le fournisseur.19
10 Essais – Généralités .20
11 Autres exigences.20

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62505-3-3 © CEI:2009 – 13 –


COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE

____________



APPLICATIONS FERROVIAIRES –

INSTALLATIONS FIXES –

EXIGENCES PARTICULIÈRES

POUR APPAREILLAGE À COURANT ALTERNATIF –



Partie 3-3: Dispositifs de mesure, de commande et de protection pour

usage spécifique dans les systèmes de traction à courant alternatif –

Transformateurs inductifs de tension monophasés


AVANT-PROPOS
1) La Commission Électrotechnique Internationale (CEI) est une organisation mondiale de normalisation
composée de l'ensemble des comités électrotechniques nationaux (Comités nationaux de la CEI). La CEI a
pour objet de favoriser la coopération internationale pour toutes les questions de normalisation dans les
domaines de l'électricité et de l'électronique. A cet effet, la CEI – entre autres activités – publie des Normes
internationales, des Spécifications techniques, des Rapports techniques, des Spécifications accessibles au
public (PAS) et des Guides (ci-après dénommés "Publication(s) de la CEI"). Leur élaboration est confiée à des
comités d'études, aux travaux desquels tout Comité national intéressé par le sujet traité peut participer. Les
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également aux travaux. La CEI collabore étroitement avec l'Organisation Internationale de Normalisation (ISO),
selon des conditions fixées par accord entre les deux organisations.
2) Les décisions ou accords officiels de la CEI concernant les questions techniques représentent, dans la mesure
du possible, un accord international sur les sujets étudiés, étant donné que les Comités nationaux de la CEI
intéressés sont représentés dans chaque comité d’études.
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comme telles par les Comités nationaux de la CEI. Tous les efforts raisonnables sont entrepris afin que la CEI
s'assure de l'exactitude du contenu technique de ses publications; la CEI ne peut pas être tenue responsa
...