IEC 62505-3-1:2020

IEC 62505-3-1 ®
Edition 2.0 2020-03
INTERNATIONAL
STANDARD
Railway applications – Fixed installations – Particular requirements for
AC switchgear –
Part 3-1: Measurement, control and protection devices for specific use
in AC traction systems – Devices
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IEC 62505-3-1 ®
Edition 2.0 2020-03
INTERNATIONAL
STANDARD
Railway applications – Fixed installations – Particular requirements for

AC switchgear –
Part 3-1: Measurement, control and protection devices for specific use

in AC traction systems – Devices

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 45.060.01 ISBN 978-2-8322-7846-8

– 2 – IEC 62505-3-1:2020 © IEC 2020
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Specific requirements from the traction system . 8
5 Requirements on measurement, control and protection devices . 8
5.1 General . 8
5.2 Voltage detection systems . 8
5.3 Devices at supply voltage of a traction system . 9
5.4 Protection devices . 9
Annex A (informative) Application guide – Measurement principles, particularly
related to the line testing methods . 11
A.1 Overview. 11
A.2 Line testing . 11
A.2.1 General . 11
A.2.2 Line testing methods . 12
A.2.3 Line testing procedures . 13
Annex B (informative) Application guide – Control principles . 15
B.1 Overview. 15
B.2 Closing control . 15
B.2.1 General . 15
B.2.2 Close inhibit. 15
B.2.3 On-command . 16
B.2.4 Auto-reclose . 17
B.3 Opening control . 17
B.3.1 General . 17
B.3.2 Auto-off sequences . 18
B.4 Automated sequences . 19
Bibliography . 21

Figure A.1 – Example of a feeder related line testing based on voltage criterion . 14

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RAILWAY APPLICATIONS – FIXED INSTALLATIONS –
PARTICULAR REQUIREMENTS FOR AC SWITCHGEAR –

Part 3-1: Measurement, control and protection devices
for specific use in AC traction systems – Devices

FOREWORD
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International Standard IEC 62505-3-1 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:
– distinguish between requirements, Clauses 4 and 5, and application guides, annexes;
– include requirements on devices for example control and protection relays not included
before;
– remove parts already included in other standards, for example EN 50633 for protection
principles, which is intended to become an IEC standard.

– 4 – IEC 62505-3-1:2020 © IEC 2020
The text of this International Standard is based on the following documents:
FDIS Report on voting
9/2563/FDIS 9/2575/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.
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.

INTRODUCTION
IEC 62505-3-1 is intended for measurement, control and protection devices for specific use in
AC traction systems other than current and voltage transformers. These are covered by
IEC 62505-3-2 and IEC 62505-3-3 respectively.
This standard covers a large variety of different kinds of equipment used in railway fixed
installations which do not have railway specific product standards. It provides clarification on
how to select ratings and test values relevant for operation in fixed installations. This standard
should be read in conjunction with the relevant product standard of the equipment concerned.
Annex A and Annex B are application guides. Annex A deals with railway specific
measurement principles and Annex B provides guidance on the design of control systems for
AC traction. These application guides identify characteristics of and parameters for
procedures and functions used. Guidance on protection principles is given in EN 50633.
The clause numbering of this part is different to that used in all other parts of the IEC 62505
series. Clause numbering in the other parts is the same as in the specific referenced product
standard.
– 6 – IEC 62505-3-1:2020 © IEC 2020
RAILWAY APPLICATIONS – FIXED INSTALLATIONS –
PARTICULAR REQUIREMENTS FOR AC SWITCHGEAR –

Part 3-1: Measurement, control and protection devices
for specific use in AC traction systems – Devices

1 Scope
This part of IEC 62505 is applicable to new low voltage devices for measurement, control and
protection which are:
– for indoor or outdoor fixed installations in traction systems, and
– operated in conjunction with high voltage equipment 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.
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 d
...