Railway applications - Fixed installations - Particular requirements for AC switchgear - Part 3-1: Measurement, control and protection devices for specific use in AC tractions systems - Devices

IEC 62505-3-1:2020 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.
This document also applies to measurement, control and protective devices other than low voltage devices and not covered by a specific railway product standard as far as reasonably possible. Requirements of this document prevail.
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:
- distinguish between requirements and application guides
- 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.

Applications ferroviaires - Installations fixes - Exigences particulières pour appareillage à courant alternatif - Partie 3-1: Dispositifs de mesure, de commande et de protection pour usage spécifique dans les systèmes de traction à courant alternatif - Dispositifs

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Status
Published
Publication Date
10-Mar-2020
Current Stage
PPUB - Publication issued
Completion Date
11-Mar-2020
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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
IEC 62505-3-1:2020-03(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 62505-3-1:2020 © 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

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IEC 62505-3-1:2020 © IEC 2020 – 3 –
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

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,

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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

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

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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

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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 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.
---------------------- Page: 5 ----------------------
– 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.
---------------------- Page: 6 ----------------------
IEC 62505-3-1:2020 © IEC 2020 – 5 –
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.
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– 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 document can also be used as a guidance for these systems.

This document also applies to measurement, control and protective devices other than low

voltage devices and not covered by a specific railway product standard as far as reasonably

possible. Requirements of this document prevail.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements 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 60255-1, Measuring relays and protection equipment – Part 1: Common requirements

IEC 60850:2014, Railway applications – Supply voltages of traction systems

IEC 61243-5, Live working – Voltage detectors – Part 5: Voltage detecting systems (VDS)

IEC 61869 (all parts), Instrument transformers
IEC 61869-1:2007, Instrument transformers – Part 1: General requirements

IEC 62236-5:2018, 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

AC switchgear
---------------------- Page: 8 ----------------------
IEC 62505-3-1:2020 © IEC 2020 – 7 –

IEC 62505-2:2016, Railway applications – Fixed installations – Particular requirements for AC

switchgear – Part 2: Disconnectors, earthing switches and switches with nominal voltage

above 1 kV

IEC 62505-3-3:— , 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
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 62505 (all parts)

and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
under-voltage
voltage the value of which is lower than a specified limiting value
[SOURCE: IEC 60050-151:2001, 151-15-29]
3.2
under-voltage off

control function which permits a mechanical switching device to open, with or without time-

delay, when the voltage of the circuit, the mechanical switching device is connected to, falls

below a predetermined value
Note 1 to entry: This term is used when a loss of primary voltage is considered.

Note 2 to entry: This function will in most cases require some kind of shunt release.

3.3
under-voltage release

shunt release which permits a mechanical switching device to open or close, with or without

time-delay, when the voltage across the terminals of the release falls below a predetermined

value

Note 1 to entry: This term is used when a loss of an auxiliary voltage is considered.

[SOURCE: IEC 60050-441:2000, 441-16-42, modified – Note 1 to entry has been added.]

3.4
under-voltage trip

protection function which permits a mechanical switching device to open, with or without time-

delay, when the voltage of the circuit, the mechanical switching device is connected to, falls

below a predetermined value
Note 1 to entry: This term is used when a loss of primary voltage is considered.

Note 2 to entry: This function will in most cases require some kind of shunt release.

____________

Second edition under preparation. Stage at the time of publication IEC CFDIS 62505-3-3:2019.

---------------------- Page: 9 ----------------------
– 8 – IEC 62505-3-1:2020 © IEC 2020
4 Specific requirements from the traction system

Traction systems due to for example their load, voltage and earthing conditions require

thorough analysis when defining operational principles and requirements for equipment.

The design of measurement, control and protection circuits, their devices and algorithms shall

consider any effect arising from:
– fast fluctuation of traction power demand;

– moving tractions units, providing scenarios with traction currents higher than failure

currents;

– the return current system, especially the track, which typically is effectively connected to

earth;
– fast fluctuation of operating voltages between U and U , with U and U as
min2 max2 min2 max2
specified in IEC 60850;

– high number of switching operations for example caused by a high number of short

circuits in the contact line systems;

– in 16,7 Hz traction systems the duration of a period of 60 ms in respect to magnetization,

saturation and switching times;

– in auto-transformer systems, a phase shift of 180° resulting in an maximum operating

voltage of 2 × U but only between phases.
max2

NOTE 1 Typically the return circuit in AC traction systems is effectively earthed. Unlike utility networks a

displacement of the star point during earth faults resulting in an increase of phase voltages by factor √3 cannot

happen.

NOTE 2 Equipment in a 25 kV traction system is subject to a maximum permanent operating voltage phase to

earth of 27,5 kV = U . Equipment in a 3 phase utility network with a highest system voltage U = 36 kV has an

max1 m

average continuous voltage phase to earth during 99 % of its life of 33/√3 kV = 19,1 kV.

If the above values are compared, it becomes clear that the dielectric stress of equipment in traction power supply

is significantly higher and therefore the test voltages e.g. during partial discharge testing have assigned higher

values in this document.
5 Requirements on measurement, control and protection devices
5.1 General

Measurement, control and protection devices shall be designed, manufactured and tested to

their specific product standards. Requirements of railway standards prevail and shall be

applied as far as reasonably possible. This especially concerns IEC 62497-1 for insulation

coordination and IEC 62236-5 for electromagnetic compatibility.

Annex A and Annex B provide guidance on specific measurement and control principles for

AC traction systems. They identify characteristics of and parameters for procedures and

functions used.
5.2 Voltage detection systems

Capacitive voltage detection systems shall comply with IEC 61243-5 except for the following

requirements:
– voltage absence indication shall be below 50 % of U ,
min2
– voltage presence indication shall be above 90 % of U and
min2
– the capacitive voltage detection system shall properly work also up to U .
max2

NOTE 1 The thresholds for voltage absence and presence indication are adapted considering the fact that

voltages are between contact line and running rail on ground potential and also considering the tolerances of

supply voltages of traction systems.
---------------------- Page: 10 ----------------------
IEC 62505-3-1:2020 © IEC 2020 – 9 –
When selecting voltage detectors manufactured according to IEC 61243-1 it may be

preferential to use thresholds for voltage absence and presence indication as specified

before.

NOTE 2 This portable equipment is only temporarily connected to a supply voltage of the traction system.

NOTE 3 There are national standards available in some countries specifying thresholds for voltage absence and

presence indication.
5.3 Devices at supply voltage of a traction system

Devices not covered by a railway specific product standard and being connected to a circuit at

supply voltage of a traction system shall comply with the test voltages including partial

discharge level as specified in IEC 62505-3-3 for this supply voltage. If these devices are

connected to provide isolation of feeding systems the test voltages shall be taken for “across

the isolating distance” from IEC 62505-2:2016, Table 1, for example when connected parallel

to a disconnector.
Other requirements of IEC 62505-3-2 or IEC 62505-3-3 or for sensors as given in

IEC 61869 (all parts) shall apply as far as reasonably possible and shall be agreed upon

between supplier and infrastructure manager.

Devices containing electronic parts shall be subject to a function test in the intended

operational circuit and under worst case conditions, for example in its installation position

next to a circuit breaker during a short circuit breaking test.

Dielectric type tests shall be applied as specified in IEC 61869-1:2007, 7.2.3 with test values

as specified in IEC 62505-3-3:—, 7.1. Dielectric routine tests shall be applied as specified in

IEC 61869-1:2007, 7.3.1 to 7.3.4 with test values as specified in IEC 62505-3-3:—, 7.1 and

7.3. Other tests and their test requirements shall be agreed upon between purchaser and

supplier prior to the order.
5.4 Protection devices

Protection devices used in railway applications shall comply with the relevant product

standards, particularly IEC 60255-1. They shall also comply with the electromagnetic

compatibility requirements given in IEC 62236-5.

Any protection device shall be specified based on a consideration of the specific requirements

from the traction system as given in Clause 4.

Protection devices for contact line protection shall include the following protection functions:

– distance protection with a minimum of two stages and the possibility to use directional

settings;

– di/dt or du/dt protection, when specified, for example by the system designer or

infrastructure manager;

– de-icing protection, when specified, for example by the system designer or infrastructure

manager.

They shall also include the possibility of blocking or delaying between the functions. In

particular, when specified, protection functions shall be blocked for a short time when a high

harmonic content is detected, for example to avoid unintended tripping due to
transformers inrush currents.

NOTE 1 This kind of protection device will typically use specially adapted algorithms and will therefore be

different to devices intended for utility use.

NOTE 2 EN 50633 provides an application guide on protections systems including back scenarios.

---------------------- Page: 11 ----------------------
– 10 – IEC 62505-3-1:2020 © IEC 2020

Protection devices for 16,7 Hz contact line protection shall include the following protection

functions in addition:
– instantaneous overcurrent protection;
– fast acting trip output.

NOTE 3 Instantaneous overcurrent protection in combination with the fast acting trip output are intended to

support fault clearance in the first half of the period. 16,7 Hz circuit breakers are typically equipped with a fast

tripping device and total time until opening of the breaker is in the range of 20 ms to 25 ms.

NOTE 4 Algorithms for 16,7 Hz contact line protection devices are in many cases different to those of 50 Hz and

60 Hz devices. This is due to the aim to achieve similar response times out of a shorter fraction of the period.

Hardware modifications are also likely to be necessary.
---------------------- Page: 12 ----------------------
IEC 62505-3-1:2020 © IEC 2020 – 11 –
Annex A
(informative)
Application guide – Measurement principles,
particularly related to the line testing methods
A.1 Overview

This application guide provides guidance in measurement principles typical to traction

systems particularly in relation to the line testing methods.

NOTE Many other principles are well known from public power supply systems and are not repeated in this annex.

Line testing has been classified as a measurement principle. Nevertheless it normally only

provides a comparison to a threshold and not a measurement value.
A.2 Line testing
A.2.1 General

Overhead contact lines are exposed to a significantly higher number of short circuits

compared to other overhead lines. This is due to the reduced height of installation above

ground and operation together with fast moving pantographs.

Any short circuit provides extra stress to the contact line which is sensitive to over-

temperatures. This sensitivity is influenced by many parameters including cross-sections and

tensile force. Based on this data and under consideration of traction load, short-circuit current

level and protection scheme, the withstand-ability of the contact line against, for example

repeated short circuits, may be determined.

NOTE 1 A typical value derived from operational experience is 1 short circuit for each km of contact line per

annum.

NOTE 2 Most sensitive to loss of tensile strength are droppers between messenger and contact wire.

The recommendation is to consider measures reducing the number of short circuits for a

contact line. One possibility is to close line circuit breakers only after the ‘short circuit free’

condition of the contact line has been verified. Experience has shown that line testing

provides a substantial benefit with short circuit current levels from 20 kA and higher.

NOTE 3 16,7 Hz railways with short circuit current levels of up to 40 kA typically use line testing whereas 50 Hz

and 60 Hz railways with short-circuit current levels of up to 16 kA typically do not.

NOTE 4 Saturation of current transformers sometimes leads to a delay in tripping of the circuit breaker after

switching on to a short circuit. Thermal stress to the contact line is unnecessarily increased in these cases. The

current transformer can be designed to prevent this effect.

All line test principles have in common that the contact line is energized with a voltage in the

range of the supply voltage for a predetermined time. The testing source provides a short

circuit impedance limiting the failure current in case of a short circuit to a few percent of the

rated current. Detection method and related parameters are fixed by the system
designers/infrastructure managers for the system.
---------------------- Page: 13 ----------------------
– 12 – IEC 62505-3-1:2020 © IEC 2020
A.2.2 Line testing methods
A.2.2.1 Line testing based on voltage criterion

This method uses a test resistor limiting the fault current to values below 10 A. The resistor is

connected to the feeder cable of the contact line under test and switched on to the feeding

system, for example by a switch-disconnector. The voltage at the contact line is measured

and provides the criterion for switching on.

NOTE 1 Typical resistance values are 3,3 kΩ to 5 kΩ leading to maximum test currents of 5,4 A to 3,6 A in

16,7 Hz railways. These resistors are typically indoor mounted, thus the room temperture is influenced by losses

dissipated during testing.

A value in the range of 50 % of the nominal supply voltage is typically considered as short

circuit free. A voltage transformer on the contact line side is required for this measurement.

The result of the
...

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