General Information

Abstract: EN 50123-7-3 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

Status: Withdrawn
Publication Date: 21-Mar-1999
Withdrawal Date: 30-Sep-1999

ICS: 29.280 - Electric traction equipment

Technical Committee: CLC/TC 9X - Electrical and electronic applications for railways
Drafting Committee: CLC/SC 9XC - Electric supply and earthing systems for public transport equipment and ancillary apparatus (fixed i
Parallel Committee: IEC/TC 9 - IEC_TC_9

Current Stage: 9960 - Withdrawal effective - Withdrawal
Start Date: 01-Sep-2005
Completion Date: 01-Sep-2005

Ref Project: 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

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Replaced By: 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
Effective Date: 28-Jan-2023

Referred By: EN 50526-2:2014 - Railway applications - Fixed installations - D.C. surge arresters and voltage limiting devices - Part 2: Voltage limiting devices
Effective Date: 03-Feb-2026

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Frequently Asked Questions

What is EN 50123-7-3:1999?

EN 50123-7-3:1999 is a standard published by CLC. Its full title is "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". This standard covers: EN 50123-7-3 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

What is the scope of EN 50123-7-3:1999?

EN 50123-7-3 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

What ICS categories does EN 50123-7-3:1999 belong to?

EN 50123-7-3:1999 is classified under the following ICS (International Classification for Standards) categories: 29.280 - Electric traction equipment. The ICS classification helps identify the subject area and facilitates finding related standards.

What standards are related to EN 50123-7-3:1999?

EN 50123-7-3:1999 has the following relationships with other standards: It is inter standard links to EN 50123-7-3:2003, EN 50526-2:2014. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

How can I access EN 50123-7-3:1999?

EN 50123-7-3:1999 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)

EN 50123-7-3:1999

SLOVENSKI STANDARD
01-december-1999
Railway applications - Fixed installation - 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 mesuring devices
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
Bahnanlagen - Ortsfeste Anlagen - Gleichstrom-Schalteinrichtungen -- Teil 7: Meß-,
Steuer- und Schutzeinrichtungen in Gleichstrom-Bahnanlagen -- Hauptabschnitt 3:
Spannungswandler und andere Meßeinrichtungen
Applications ferroviaires - Installations fixes - Appareillage à courant continu -- Partie 7:
Appareils de mesure, de commande et de protection pour utilisation spécifique dans les
systèmes de traction à courant continu -- Section 3: Transducteurs et autres appareils de
mesure de la tension
Ta slovenski standard je istoveten z: EN 50123-7-
...

CLC

EN IEC 62590-2-2:2026(Main)

Railway applications - Electronic power converters for fixed installations - Part 2-2: DC Traction applications - Controlled converters

SIST EN IEC 62590-2-2:2026

IEC 62590-2-2:2026 describes functions and working principles, specifies requirements, interfaces, and test methods for controlled converters for DC electric traction power supply systems: – AC/DC converters: • rectifiers, • inverters, • combinations. – DC converters. The purpose of the converters can be a power connection to other power networks or energy storages. The common characteristic of this equipment is the possibility to influence the power flow in the DC electric traction power supply system. The converters can be: – line-commutated; – self-commutated. This document applies to fixed installations of the following electric traction systems: – railway networks, – metropolitan transport networks including metros, tramways, trolleybuses and fully automated transport systems, magnetic levitated transport systems, and electric road systems.

Standard
49 pages
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13-Aug-2026
29.280
CLC/TC 9X

CLC

CLC/TS 50711:2026(Main)

Railway applications - Fixed installations - High-voltage/low-voltage prefabricated substations in AC and DC electric traction systems

SIST-TS CLC/TS 50711:2026

This document specifies - the service conditions; - rated characteristics; - general structural requirements; and - test methods of prefabricated traction substations for use in AC and DC electric traction systems, which as a minimum contain an enclosure and a traction switchgear designed and manufactured according to - EN 50123 6 in DC electric traction systems; - CLC/TS 50152 4 in AC electric traction systems. Traction substations using non-type tested traction switchgear are covered by EN IEC 61936 1:2021. NOTE 1 Due to the type testing requirements on the prefabricated traction substations only type tested traction switchgear is considered. The enclosures of the prefabricated traction substations for use in AC and DC electric traction systems are - designed for outdoor installation at locations with or without public accessibility; - connected by insulated cable; - operated from inside (walk-in type) or outside (non-walk-in type). NOTE 2 Prefabricated traction substations for railway applications are typically of the walk-in type due to the rating and resulting dimensions of the AC or DC traction switchgear. Prefabricated traction substations can be situated at ground level or partially or completely below ground level. In general a prefabricated traction substation comprises an enclosure, a traction switchgear and can include the following additional main components: - power transformers; - electronic power converters; - high-voltage and/or low-voltage switchgear and controlgear; - high-voltage and/or low-voltage interconnections; - auxiliary equipment and circuits. However, relevant provisions of this document are applicable to designs where not all these main components exist. NOTE 3 The term "main component”"is defined in 3.3.103 of EN IEC 62271 202:2022. NOTE 4 For example, a switching station in an AC electric traction system consisting of an AC metal-enclosed traction switchgear and auxiliary circuits only. NOTE 5 EN IEC 61936 1:2021 provides general rules for the design and erection of high-voltage power installations. As well, it specifies additional requirements for the external connections, erection and operation at the place of installation of high-voltage prefabricated traction substations compliant with EN IEC 62271 202:2022, which are regarded as a main component of such installation. Non-prefabricated traction substations, are generally covered by EN IEC 61936 1:2021. This document covers designs using natural ventilation and/or any other kind of cooling system. Due to the large number of different main components being addressed in this document the expression "main components shall comply with (the applicable subclause of) their specific product standard" is used in this document. This means that reference is to - EN 50123 6:2003 for DC traction switchgear; - to other parts of the EN 50123 series for switching devices also measurement, control and protection devices for DC traction applications; - CLC/TS 50152 4:2021 for AC traction switchgear; - other parts of the EN 50152 series for switching devices and also measurement, control and protection devices for AC traction applications; - EN 50328:2003 for electronic power converters; - EN 50329:2003 for traction power transformers; - EN IEC 61439-1:2021 for low-voltage non-traction switchgear; and - EN IEC 62271 200:2021 for high-voltage non-traction switchgear.

Technical specification
55 pages
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14-May-2026
29.280
CLC/TC 9X

CLC

CLC/TS 50238-2:2026(Main)

Railway applications - Compatibility between rolling stock and train detection systems - Part 2: Compatibility with track circuits

SIST-TS CLC/TS 50238-2:2026

This document defines, for the purpose of ensuring compatibility between rolling stock and track circuits, the limits for interference current emissions from rolling stock. The measurement and evaluation methods for verifying conformity of rolling stock to these limits are presented in a dedicated annex. The interference limits are only applicable to rolling stock that is intended to run on lines exclusively equipped with preferred track circuits listed in this document. The rolling stock test methodology (infrastructure conditions, test configurations, operational conditions, etc.) presented in this document is applicable to establish compatibility with any track circuits. This document gives guidance on the derivation of interference current limits specified for rolling stock and defines measurement methods and evaluation criteria in a dedicated annex. This document defines: a) a set of interference current limits for RST (Rolling Stock) applicable for each of the following types of traction system: 1) DC (750 V, 1,5 kV and 3 kV); 2) 16,7 Hz AC; 3) 50 Hz AC; b) a methodology for the demonstration of compatibility between rolling stock and track circuits; c) a measurement method to verify interference current limits and evaluation criteria. NOTE 1 The basic parameters of track circuits associated with the interference current limits for RST are not in the scope of this document. NOTE 2 Any phenomena linked to traction power supply and associated protection (over voltage, short-circuit current, under- and over-voltage if regenerative brakes are used) is part of the track circuit design and outside the scope of this document.

Technical specification
32 pages
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CLC

EN 50317:2025(Main)

Railway applications - Current collection systems - Requirements for and validation of measurements of the dynamic interaction between pantograph and overhead contact line

SIST EN 50317:2026

This document specifies the functional requirements for output and accuracy of measurements of the dynamic interaction between pantograph and overhead contact line.

Standard
26 pages
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CLC

EN 50152-3-1:2017/A1:2025(Amendment)

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

SIST EN 50152-3-1:2017/A1:2026

This European Standard 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 a.c. line voltage and frequency as specified in EN 50163. This European Standard 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. Scope of amendment Implementation of 2 technical changes: — Modification of subclause 5.4, second item in list of protection functions. — Aligning the value for short-circuit current of 50 Hz traction systems given in Annex A subclause A.2.1 ‘Line testing – General’ with EN 50388-1:2022 Table 7

Amendment
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CLC

CLC/TS 50740:2025(Main)

Technical Specification for ground-based feeding systems for dynamic electric road charging infrastructure on road vehicles in operation

SIST-TS CLC/TS 50740:2025

This document specifies the infrastructure part defined in Figure 1 and Figure A.2 of the conducted ground based feeding systems and their interfaces. The charging infrastructure can be used for charging all road vehicle types at standstill or in motion. This document covers the following aspects: - interaction between the ground based feeding systems and ERS vehicles; - electrical safety and stray current protection (in case of DC electric traction power supply systems); - environmental requirements; - validation requirements. This document defines the interfaces between: - the ground based feeding system and the grid; - the infrastructure of the ground based feeding system and the on-board current collector devices of the vehicles including the specificities according to the different interface types. This document is not applicable to the on-board part of the conducted ground based feeding systems. This document is not applicable to motorcycles (including tricycles and quadricycles). This document is not applicable to vehicles or electric buses with dynamic or static inductive charging systems and related power supplies. This document is not applicable to vehicles or electric buses with dynamic or static conductive charging systems through overhead lines. This document does not apply for charging stations with only a plug-in solution.

Technical specification
21 pages
English language
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CLC

EN 50122-1:2022/A1:2025(Amendment)

Fixed installations for railway applications - Electrical safety, earthing and the return circuit - Part 1: Protective provisions against electric shock

SIST EN 50122-1:2022/A1:2025

This document specifies requirements for the protective provisions relating to electrical safety in fixed installations associated with AC and/or DC traction systems and to any installations that can be endangered by the electric traction power supply system. This also includes requirements applicable to vehicles on electrified lines. It also applies to all aspects of fixed installations which are necessary to ensure electrical safety during maintenance work within electric traction power supply systems. This document applies to new electric traction power supply systems and major revisions to electric traction power supply systems for: a) railways; b) guided mass transport systems such as 1) tramways, 2) elevated and underground railways, 3) mountain railways, 4) trolleybus systems, 5) electric traction power supply systems for road vehicles, which use an overhead contact line system, and 6) magnetically levitated systems, which use a contact line system; c) material transportation systems. This document does not apply to: a) electric traction power supply systems in underground mines, b) cranes, transportable platforms and similar transportation equipment on rails, temporary structures (e.g. exhibition structures) in so far as these are not supplied directly or via transformers from the contact line system and are not endangered by the electric traction power supply system, c) suspended cable cars, d) funicular railways, e) existing vehicles. This document does not specify working rules for maintenance. The requirements within this document related to protection against electric shock are applicable to persons only.

Amendment
13 pages
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CLC

EN 50122-2:2022/A1:2025(Amendment)

Fixed installations for railway applications - Electrical safety, earthing and the return circuit - Part 2: Provisions against the effects of stray currents caused by DC traction systems

SIST EN 50122-2:2022/A1:2025

This document specifies requirements for protective provisions against the effects of stray currents, which result from the operation of DC electric traction power supply systems. As several decades' experience has not shown evident corrosion effects from AC electric traction power supply systems, this document only deals with stray currents flowing from a DC electric traction power supply system. This document applies to all metallic fixed installations which form part of the traction system, and also to any other metallic components located in any position in the earth, which can carry stray currents resulting from the operation of the railway system. This document applies to all new DC lines and to all major revisions to existing DC lines. The principles can also be applied to existing electrified transportation systems where it is necessary to consider the effects of stray currents. This document does not specify working rules for maintenance but provides design requirements to allow maintenance. The range of application includes: a) railways, b) guided mass transport systems such as: 1) tramways, 2) elevated and underground railways, 3) mountain railways, 4) magnetically levitated systems, which use a contact line system, and 5) trolleybus systems, c) material transportation systems. This document does not apply to a) electric traction power supply systems in underground mines, b) cranes, transportable platforms and similar transportation equipment on rails, temporary structures (e.g. exhibition structures) in so far as these are not supplied directly from the contact line system and are not endangered by the electric traction power supply system, c) suspended cable cars, d) funicular railways.

Amendment
10 pages
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CLC

EN 50122-3:2022/A1:2025(Amendment)

Fixed installations for railway applications - Electrical safety, earthing and the return circuit - Part 3: Mutual Interaction of AC and DC traction systems

SIST EN 50122-3:2022/A1:2025

This document specifies requirements for the protective provisions relating to electrical safety in fixed installations, when it is reasonably likely that hazardous voltages or currents will arise for people or equipment, as a result of the mutual interaction of AC and DC electric power supply traction systems. It also applies to all aspects of fixed installations that are necessary to ensure electrical safety during maintenance work within electric power supply traction systems. The mutual interaction can be of any of the following kinds: - parallel running of AC and DC electric traction power supply systems; - crossing of AC and DC electric traction power supply systems; - shared use of tracks, buildings or other structures; - system separation sections between AC and DC electric traction power supply systems. The scope is limited to galvanic, inductive and capacitive coupling of the fundamental frequency voltages and currents and their superposition. This document applies to all new lines, extensions and to all major revisions to existing lines for the following electric traction power supply systems: a) railways; b) guided mass transport systems such as: 1) tramways, 2) elevated and underground railways, 3) mountain railways, 4) magnetically levitated systems, which use a contact line system, 5) trolleybus systems, and 6) electric traction power supply systems for road vehicles, which use an overhead contact line system; c) material transportation systems. The document does not apply to: a) electric traction power supply systems in underground mines; b) cranes, transportable platforms and similar transportation equipment on rails, temporary structures (e.g. exhibition structures) in so far as these are not supplied directly or via transformers from the contact line system and are not endangered by the electric traction power supply system for railways; c) suspended cable cars; d) funicular railways; e) procedures or rules for maintenance. The rules given in this document can also be applied to mutual interaction with non-electrified tracks, if hazardous voltages or currents can arise from AC or DC electric traction power supply systems.

Amendment
4 pages
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CLC

EN IEC 62590-1:2025(Main)

Railway applications - Electronic power converters for fixed installations - Part 1: General requirements

SIST EN IEC 62590-1:2025

IEC 62590-1:2025 specifies the common requirements and definitions for all power converter applications in fixed installations for power supply of railway systems. This document applies to fixed installations of following electric traction systems: railway networks, metropolitan transport networks including metros, tramways, trolleybuses and fully automated transport systems, magnetic levitated transport systems, electric road systems. This document applies to AC/DC converters, DC converters and AC converters. Converters for improvement of power quality and for energy saving are also included. Converters connected to electric traction systems feeding 3AC, 1AC or DC systems for auxiliary purpose are not in the scope of this document but some aspects such as insulation coordination and railway specific conditions can be referred to. This document, in conjunction with the other parts of IEC 62590, cancels and replaces IEC 62589:2010 and the former IEC 62590:2019. This document includes the following significant technical changes with respect to IEC 62589:2010 and the former IEC 62590:2019: a) Split into common requirements and special requirements for different converters; b) Interface Model for the different systems connected; c) Split into circuits with their requirements like insulation coordination; d) Energy efficiency addressed.

Standard
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