Railway applications - Fixed installations - Particular requirements for AC switchgear - Part 3-2: Measurement, control and protection devices for specific use in AC traction systems - Current transformers

IEC 62505-3-2:2020 is applicable to new current transformers which are:
- intended for use in indoor or outdoor fixed installations in traction systems, and
- operated with an AC line voltage and frequency as specified in IEC 60850.
This second edition cancels and replaces the first edition published in 2009.This edition includes the following significant technical changes with respect to the previous edition :
- this standard was revised to reflect the latest versions of standards referenced and to remove text already included in the IEC 61869 series.
- the structure of the document was adapted to that of IEC 62505‑1 and IEC 62505‑2.
- ratings have been added to provide designations in line with other railway standards, for example IEC 62497.
- test requirements have been detailed to meet operating conditions of railway applications.
- partial discharge voltages have been specified.

General Information

Status
Published
Publication Date
10-Mar-2020
Current Stage
PPUB - Publication issued
Completion Date
11-Mar-2020
Ref Project

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IEC 62505-3-2:2020 - Railway applications - Fixed installations - Particular requirements for AC switchgear - Part 3-2: Measurement, control and protection devices for specific use in AC traction systems - Current transformers
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IEC 62505-3-2
Edition 2.0 2020-03
INTERNATIONAL
STANDARD
Railway applications – Fixed installations – Particular requirements for AC
switchgear –
Part 3-2: Measurement, control and protection devices for specific use in AC
traction systems – Current transformers
IEC 62505-3-2:2020-03(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62505-3-2
Edition 2.0 2020-03
INTERNATIONAL
STANDARD
Railway applications – Fixed installations – Particular requirements for AC
switchgear –
Part 3-2: Measurement, control and protection devices for specific use in AC
traction systems – Current transformers
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 45.060.01 ISBN 978-2-8322-7851-2

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 62505-3-2:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

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

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

3 Terms, definitions and abbreviated terms ........................................................................ 7

3.1 Terms and definitions .............................................................................................. 7

3.2 Abbreviated terms ................................................................................................... 8

4 Service conditions ........................................................................................................... 8

5 Rating.............................................................................................................................. 8

5.1 General ................................................................................................................... 8

5.2 Nominal voltage (U ) .............................................................................................. 8

5.3 Rated voltage (U ) ............................................................................................... 9

5.4 Insulation coordination ............................................................................................ 9

5.4.1 General ........................................................................................................... 9

5.4.2 Rated insulation level ...................................................................................... 9

5.5 Rated frequency ................................................................................................... 10

5.6 Rated accuracy classes ........................................................................................ 10

6 Design and construction ................................................................................................ 11

6.1 General ................................................................................................................. 11

6.2 Transformer construction ...................................................................................... 11

6.3 Requirements for the external insulation ............................................................... 11

6.4 Electromagnetic compatibility (EMC) ..................................................................... 11

6.5 Nameplates........................................................................................................... 11

7 Tests ............................................................................................................................. 11

7.1 General ................................................................................................................. 11

7.2 Electromagnetic compatibility tests (EMC) ............................................................ 12

7.3 Partial discharge test ............................................................................................ 12

8 Rules for transport, storage, erection, operation and maintenance ................................. 12

9 Safety ............................................................................................................................ 12

10 Influence of the product on the environment .................................................................. 12

11 Information to be given with enquiries, tenders and orders ............................................ 12

Bibliography .......................................................................................................................... 13

Table 1 – Nominal voltages (U ), rated voltages (U ), rated impulse voltages (U )

n Ne Ni

and power-frequency withstand voltages (U ) for circuits connected to the contact line ........ 10

Table 2 – Partial discharge test voltages and permissible levels ........................................... 12

---------------------- Page: 4 ----------------------
IEC 62505-3-2:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RAILWAY APPLICATIONS – FIXED INSTALLATIONS –
PARTICULAR REQUIREMENTS FOR AC SWITCHGEAR –
Part 3-2: Measurement, control and protection devices for
specific use in AC traction systems – Current transformers
FOREWORD

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International Standard IEC 62505-3-2 has been prepared by IEC technical committee 9:

Electrical equipment and systems for railways.

This second edition cancels and replaces the first edition published in 2009. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

– this standard was revised to reflect the latest versions of standards referenced and to

remove text already included in the IEC 61869 series.

– the structure of the document was adapted to that of IEC 62505-1 and IEC 62505-2.

– ratings have been added to provide designations in line with other railway standards, for

example IEC 62497.
---------------------- Page: 5 ----------------------
– 4 – IEC 62505-3-2:2020 © IEC 2020

– test requirements have been detailed to meet operating conditions of railway applications.

– partial discharge voltages have been specified in Table 2.
The text of this International Standard is based on the following documents:
FDIS Report on voting
9/2564/FDIS 9/2576/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

This standard is to be read in conjunction with IEC 61869-1:2007 and IEC 61869-2:2012 (see

Introduction).

A list of all parts in the IEC 62505 series, published under the general title Railway

applications – Fixed installations – Particular requirements for AC switchgear, can be found

on the IEC website.

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

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
---------------------- Page: 6 ----------------------
IEC 62505-3-2:2020 © IEC 2020 – 5 –
INTRODUCTION

Where a particular clause/subclause of IEC 61869-2 is not mentioned in this standard, that

clause/subclause applies as far as reasonable. Where requirements relate exclusively to

three-phase systems or to voltages outside those in use in traction systems, they are not

applicable. Where this standard states “addition” or “replacement”, the relevant text of

IEC 61869-2 is to be adapted accordingly.

The numbering of clauses in the IEC 61869 series is similar to that in the IEC 62505 series.

Where terms defined in IEC 61869-1 and IEC 61869-2 conflict with definitions of the same

terms as given in IEC 60050-811:2017 or of the other railway applications documents listed in

the normative references, the definitions in IEC 61869-1 and IEC 61869-2 are to be used.

NOTE The suffix N which appears in this document for rated values is not present in IEC 61869-1 and

IEC 61869-2.

References in subclauses of IEC 61869-1 and IEC 61869-2 have to be replaced by references

to applicable subclauses in this document as far as reasonably possible.
---------------------- Page: 7 ----------------------
– 6 – IEC 62505-3-2:2020 © IEC 2020
RAILWAY APPLICATIONS – FIXED INSTALLATIONS –
PARTICULAR REQUIREMENTS FOR AC SWITCHGEAR –
Part 3-2: Measurement, control and protection devices for
specific use in AC traction systems – Current transformers
1 Scope
This part of IEC 62505 is applicable to new current transformers which are:

– intended for use in indoor or outdoor fixed installations in traction systems, and

– operated with an AC line voltage and frequency as specified in IEC 60850.
NOTE 1 IEC 60850 specifies the AC traction systems:
15 kV 16,7 Hz,
12 kV 25 Hz,
12,5 kV, 20 kV also 25 kV with 50 Hz and
12,5 kV, 20 kV, 25 kV also 50 kV with 60 Hz z.

NOTE 2 As rails of AC traction systems are typically connected to earth and included in the return current path,

all phase to earth voltages are subject to the limits as given in IEC 60850. Nevertheless, conductor to conductor

voltages are some times higher, e.g. in autotransformer systems.

This document does not provide specific requirements for AC traction systems supplied with a

frequency of 25 Hz or with a nominal voltage of 12,5 kV or 50 kV. Nevertheless requirements

set out in this document can also be used as a guidance for these systems.

This document also applies to low-voltage current transformers which are operated in a

traction system with an AC line voltage and frequency as specified in IEC 60850.

NOTE 3 These are e.g. current transformers without primary conductor and primary insulation of their own, e.g. of

the cable or ring core type.
Current transformers are mainly used with:
– measuring instruments,
– protective devices.
This document also applies to current transformers other than
...

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