SIST 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

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.

Bahnanwendungen - Ortsfeste Anlagen - Gleichstrom-Schalteinrichtungen -- Teil 7-3: Mess-, Steuer- und Schutzeinrichtungen in Gleichstrom-Bahnanlagen - Messumformer für Spannungsmessung und andere Spannungsmesseinrichtungen

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

Železniške naprave – Stabilne naprave električne vleke – Stikalne naprave za enosmerni tok – 7-3. del: Merilne, krmilne in zaščitne naprave za izključno uporabo v vlečnih sistemih za enosmerni tok, Izolacijski napetostni pretvorniki in druge naprave za merjenje toka

General Information

• Status: Published
• Publication Date: 30-Apr-2003
• ICS: 29.130.99 - Other switchgear and controlgear
• ICS: 29.280 - Electric traction equipment
• Technical Committee: ŽEN - Electrical applications for railways
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-May-2003
• Due Date: 01-May-2003
• Completion Date: 01-May-2003
• Directive: 2003-01-2787 - Pravilnik o projektiranju, gradnji in vzdrževanju stabilnih naprav električne vleke enosmernega sistema 3 kV
• Ref Project: 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

Relations

• Replaces: SIST EN 50123-7-3:1999 - Railway applications - Fixed installations - D.C. switchgear -- Part 7: Measurement, control and protection devices for specific use in d.c. traction systems -- Section 3: Isolating voltage transducers and other voltage measuring devices
• Effective Date: 06-May-2014

Overview

SIST EN 50123-7-3:2003 is a European Standard developed by CLC that specifies requirements for isolating voltage transducers and other voltage measuring devices used in d.c. railway fixed installations. These devices play a critical role in d.c. traction systems by providing galvanic insulation between the live switchboard conductor or rail voltage sensors and secondary devices, such as protection or measurement equipment. Ensuring safe, accurate, and reliable voltage measurement is essential for efficient railway operation and electrical safety, particularly in electric traction applications.

Key Topics

• Scope and Application
  This standard applies specifically to isolating voltage transducers and voltage measuring devices installed in d.c. railway fixed installations, focusing on their electrical and mechanical characteristics, service requirements, and performance criteria.

• Electrical Characteristics

  • Isolation to withstand the main circuit's insulation level
  • Input impedance typically greater than 1 MΩ
  • Output signals commonly 0-10 V or 4-20 mA
  • Frequency response from d.c. up to at least 1 kHz
  • Operability within 0 to 1.2 times the rated voltage
  • Electromagnetic compatibility (EMC) performance requirements as per EN 50121 series
  • Requirements for self-checking and auxiliary power supply status indication in electronic transducers

• Mechanical Characteristics
  Devices are housed in insulated or metal enclosures with earthed mounting feet to withstand mechanical stresses within switchgear assemblies without degradation in accuracy or damage.

• Service Requirements
  Devices must comply with pollution degree PD4 and specified overvoltage categories commonly found in railway environments to guarantee durability and reliability under harsh operational conditions.

• Testing Protocols

  • Dielectric withstand voltage tests, including impulse testing for voltages exceeding 2.5 kV
  • Calibration for accuracy verification across the input voltage range
  • EMC tests to ensure immunity and emission compliance for railway operation

• Communication Between Supplier and Purchaser
  The standard emphasizes detailed exchange of technical data such as rated/insulation voltage, accuracy tolerances, impedances, auxiliary supply characteristics, and thermal deviations to ensure device suitability for the specific railway system.

Applications

SIST EN 50123-7-3:2003 is primarily applied in:

• D.C. traction power supply systems to provide reliable voltage measurement with galvanic isolation
• Fixed installations within railway substations and switchgear panels
• Protection devices and control systems requiring accurate voltage inputs
• Safety-critical applications where insulation coordination and electrical isolation reduce the risk of faults and personnel hazards
• New railway infrastructure projects and maintenance of existing installations to comply with European norms

Railway electrification engineers, installation designers, maintenance teams, and equipment manufacturers rely on this standard to ensure their isolating voltage transducers meet stringent performance, safety, and interoperability requirements.

Related Standards

• EN 50123-1:2003 – General requirements for D.C. switchgear fixed installations, including definitions, service conditions, and insulation coordination applicable to transducers covered in Part 7-3.
• EN 50121 series – Electromagnetic compatibility (EMC) standards for railway applications, defining immunity and emission limits relevant for voltage measurement devices.
• EN 50124-1 – Insulation coordination for railway applications, setting pollution degrees and overvoltage categories used as reference conditions.
• EN 50163 – Supply voltages for traction systems, referenced for setting rated voltage parameters in this standard.

By aligning with these complementary standards, SIST EN 50123-7-3:2003 ensures comprehensive coverage of electrical, mechanical, and electromagnetic performance for isolating voltage transducers in d.c. traction systems.

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Keywords: SIST EN 50123-7-3:2003, railway applications, d.c. traction systems, isolating voltage transducers, voltage measuring devices, railway fixed installations, galvanic insulation, d.c. switchgear, voltage measurement, electrical safety, railway electrification standards, CENELEC standards, EMC for railway equipment

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Bahnanwendungen - Ortsfeste Anlagen - Gleichstrom-Schalteinrichtungen -- Teil 7-3: Mess-, Steuer- und Schutzeinrichtungen in Gleichstrom-Bahnanlagen - Messumformer für Spannungsmessung und andere SpannungsmesseinrichtungenApplications 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 tensionRailway 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 devices29.280Electric traction equipment29.130.99Druge stikalne in krmilne napraveOther switchgear and controlgearICS:Ta slovenski standard je istoveten z:EN 50123-7-3:2003SIST EN 50123-7-3:2003en01-maj-2003SIST EN 50123-7-3:2003SLOVENSKI
STANDARDSIST EN 50123-7-3:19991DGRPHãþD

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
© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50123-7-3:2003 E
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
Bahnanwendungen – 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.
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
national standard or by endorsement (dop) 2003-09-01
- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2005-09-01
This Part 7-2 is to be used in conjunction with EN 50123-1:2003.
_____________ SIST EN 50123-7-3:2003

- 3 - EN 50123-7-3:2003 Contents
Page
Scope. 4
Normative references. 4
Definitions. 4
Service requirements. 4
Characteristics. 4 5.1
Electrical characteristics. 4 5.2
Mechanical characteristics. 6
Information to be exchanged between purchaser and supplier. 6
Tests. 7 7.1
Dielectric tests. 7 7.2
Calibration test. 7 7.3
EMC tests. 7
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.
2 Normative references
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 publi
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