Bsi bs en 50123 7 3 2003

www bzfxw com BRITISH STANDARD BS EN 50123 7 3 2003 Railway applications — Fixed installations — D C switchgear — Part 7 3 Measurement, control and protection devices for specific use in d c traction[.]

BRITISH STANDARD BS EN

50123-7-3:2003

Railway applications —

Fixed installations —

D.C switchgear —

Part 7-3: Measurement, control and

protection devices for specific use in

d.c traction systems — Isolating voltage

transducers and other voltage

measuring devices

The European Standard EN 50123-7-3:2003 has the status of a

British Standard

ICS 29.280

BS EN 50123-7-3:2003

This British Standard, was

published under the authority

of the Standards Policy and

Strategy Committee on

11 July 2003

© BSI 11 July 2003

ISBN 0 580 42254 2

National foreword

This British Standard is the official English language version of

EN 50123-7-3:2003 It supersedes BS EN 50123-7-3:1999 which is withdrawn The UK participation in its preparation was entrusted by Technical Committee GEL/9, Railway electrotechnical applications, to Subcommittee GEL/9/3, Fixed equipment, which has the responsibility to:

A list of organizations represented on this subcommittee can be obtained on request to its secretary.

Cross-references

The British Standards which implement international or European

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Summary of pages

This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 7 and a back cover.

The BSI copyright date displayed in this document indicates when the document was last issued.

Amendments issued since publication

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EUROPEAN STANDARD EN 50123-7-3

NORME EUROPÉENNE

EUROPÄISCHE NORM February 2003

CENELEC

European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

ICS 29.280 Supersedes EN 50123-7-3:1999

English version

Railway applications – Fixed installations – D.C switchgear Part 7-3: Measurement, control and protection devices

for specific use in d.c traction systems – Isolating voltage transducers and other voltage measuring devices

Applications ferroviaires –

Installations fixes –

Appareillage à courant continu

Partie 7-3: Appareils de mesure,

de commande et de protection pour

usage spécifique dans les systèmes

de traction à courant continu –

Transducteurs et autres appareils

de mesure de la tension

Ortsfeste Anlagen – Gleichstrom-Schalteinrichtungen Teil 7-3: Mess-, Steuer- und Schutzeinrichtungen in Gleichstrom-Bahnanlagen –

Messumformer für Spannungsmessung und andere Spannungsmesseinrichtungen

This European Standard was approved by CENELEC on 2002-09-01 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 Central Secretariat 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 Central Secretariat has the same status as the official versions

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom

Foreword

This European Standard was prepared by SC 9XC, Electric supply and earthing systems for public transport equipment and ancillary apparatus (fixed installations), of the Technical Committee CENELEC TC 9X, Electrical and electronic applications for railways

The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50123-7-3 on 2002-09-01

This European Standard supersedes EN 50123-7-3:1999

The following dates were fixed:

- latest date by which the EN has to be implemented

at national level by publication of an identical

- latest date by which the national standards conflicting

This Part 7-2 is to be used in conjunction with EN 50123-1:2003

_

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Contents

Page

1 Scope 4

2 Normative references 4

3 Definitions 4

4 Service requirements 4

5 Characteristics 4

5.1 Electrical characteristics 4

5.2 Mechanical characteristics 6

6 Information to be exchanged between purchaser and supplier 6

7 Tests 7

7.1 Dielectric tests 7

7.2 Calibration test 7

7.3 EMC tests 7

1 Scope

This European Standard gives the requirements for isolating voltage transducers and other voltage measuring devices used in d.c railway applications, fixed installations

This transducer is normally positioned between the voltage sensor on the live switchboard conductor or rail and the secondary device, giving galvanic insulation between the input and the output

This European Standard incorporates by dated or undated references, provisions from other publications These normative references are cited at the appropriate places in the text and the publications are listed hereafter For dated references, subsequent amendments to or revisions

of any of these publications apply to this European Standard only when incorporated in it by amendment or revision For undated references the latest edition of the publication referred to applies (including amendments)

See EN 50123-1:2003

3 Definitions

For the purposes of this European standard, the terms and definitions given in EN 50123-1 apply

Where the equipment described in this standard is mounted on devices or in assemblies covered by the EN 50123 series, the service requirements of the devices or assemblies apply

In this European standard the pollution degree PD4 and overvoltage categories (see Table 1, notes of EN 50123-1), as described in EN 50124-1, are considered to be the normal conditions

The normal service requirements are given in Annex B of EN 50123-1

5 Characteristics

5.1 Electrical characteristics

5.1.1 General

The isolating transducer has an insulation level between its primary terminals and secondary terminals which is the same as that of the main circuit

An isolating transducer shall have an insulation level in accordance with Table 1 of

EN 50123-1

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Transducers intended for location near live conductors shall be provided with an insulated enclosure, unless alternative arrangements are agreed with the purchaser Its output signal shall preferably be one of the appropriate devices described in 3.1.8 to 3.1.12 of EN 50123-1 Transducers shall be suitable for use providing inputs to measuring devices and/or protection devices The output impedance, accuracy, linearity of response and phase shift between input and output shall be compatible with its designated application

The frequency range shall be from d.c to a minimum of 1 kHz

Based on the rated voltage assigned to the device UNe, the voltage transducer shall be able to

operate correctly at rated accuracy in the range 0 UNe to 1,2 UNe within the defined tolerance

It is recommended that UNe is assigned higher or at least equal to Umax2 (see EN 50163)

The input impedance on the primary side shall be > 1 MΩ or as agreed with the purchaser NOTE 1 It is recommended that a fuse (preferably accessible from outside the live compartment to provide safe access when the main circuit is still energised) is fitted in the transducer or divider primary connection It is suggested that for systems connected to the transducer or divider secondary, where both the live and return conductors are unearthed, a second fuse/removable link is fitted between the transducer or divider and return conductor

NOTE 2 Attention is required to be paid to EMC emissions and immunity in locating the sensor.

Preferred secondary signal may either be a voltage in the range from 0 V to 10 V or a current

in the range from 4 mA to 20 mA (e.g 0 mA to 20 mA, 4 mA to 20 mA or 0 mA to 10 mA)

When the transducer uses an auxiliary power supply, means shall be provided to indicate that the power supply is not available If the principle of operation of the transducer is electronic, then self-checking means shall be provided The need for this requirement depends on the duty of the transducer and shall be specified by the purchaser

Due consideration shall be given to providing adequate protection of the transducer and associated circuits against overloads and short circuits

5.1.2 Isolating transducer requirements

The following requirements characterise the isolating transducer:

5.1.3 Divider requirements

The following requirements characterise the divider and shall be specified:

5.2 Mechanical characteristics

The enclosure of the transducer may be metal enclosed, or of insulating material Both may

have earthed metal mounting feet

Mechanical stress caused by operation of other acting devices within the switchgear or

adjacent to the transducer shall not cause damage or loss of accuracy to the transducer

6 Information to be exchanged between purchaser and supplier

The supplier shall give the requirements specified in 5.1.2 and 5.1.3 as far as applicable and

the purchaser shall confirm or complement these requirements as necessary

If requested the following information shall be provided by the supplier in addition to the

requirements specified above:

a) insulation levels of the circuits;

b) accuracy range and tolerances;

c) overvoltage capability;

f) input impedance of the device connected to the secondary side of the transducer;

g) thermal deviation of the secondary signal expressed per °C;

h) if inversion of polarity in the auxiliary supply may damage the device;

i) burden

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A rating plate shall be provided with at least the following: conversion ratio, insulation level, serial number and manufacturer’s name

7 Tests

7.1 Dielectric tests

Power-frequency voltage withstand tests shall be a routine test The voltage shall be applied between all auxiliary power supply terminals and the primary side and between the secondary terminals and the auxiliary power supply

An impulse test for transducers used on systems having U Nm greater than 2,5 kV is a type test made between input terminals and all other terminals including the transducer mounting feet Power frequency test values shall be taken from Table 1 of EN 50123-1

7.2 Calibration test

This is a routine test

Linearity shall be checked against the declared accuracy in the range from 0 UNm to 1,2 UNm

The purpose of this test is to verify declared accuracy over the specified operating range and record variations When voltage variations of the auxiliary supply can affect the calibration, the test shall be repeated at the maximum supply voltage limits

7.3 EMC tests

EMC tests shall be in accordance with the EN 50121 series

BS EN

50123-7-3:2003

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