BS EN 50124-1:2017 – TC:2020 Edition
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Tracked Changes. Railway applications. Insulation coordination – Basic requirements. Clearances and creepage distances for all electrical and electronic equipment
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 143 |
This European Standard deals with insulation coordination in railways. It applies to equipment for use in signalling, rolling stock and fixed installations. Insulation coordination is concerned with the selection, dimensioning and correlation of insulation both within and between items of equipment. In dimensioning insulation, electrical stresses and environmental conditions are taken into account. For the same conditions and stresses, these dimensions are the same. An objective of insulation coordination is to avoid unnecessary over dimensioning of insulation. This standard specifies: – requirements for clearances and creepage distances for equipment; – general requirements for tests pertaining to insulation coordination. The term equipment relates to a section as defined in 3.3 it may apply to a system, a sub-system, an apparatus, a part of an apparatus, or a physical realization of an equipotential line. This standard does not deal with: – distances through solid or liquid insulation; – distances through gases other than air; – distances through air not at atmospheric pressure; – equipment used under extreme conditions. Product standards should align with this generic standard. However, they may require, with justification, different requirements due to safety and/or reliability reasons, e.g. for signalling, and/or particular operating conditions of the equipment itself, e.g. overhead contact lines which should comply with EN 50119. This standard also gives provisions for dielectric tests (type tests or routine tests) on equipment (see Annex B). NOTE For safety critical systems, specific requirements are needed. These requirements are given in the product specific signalling standard EN 50129.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 94 | 1 Scope 2 Normative references |
| 95 | 3 Terms and definitions |
| 98 | 4 Basis for insulation coordination 4.1 Basic principles 4.1.1 General 4.1.2 Insulation coordination with regard to voltage 4.1.2.1 General 4.1.2.2 Insulation coordination with regard to permanent a.c. or d.c. voltages |
| 99 | 4.1.2.3 Insulation coordination with regard to transient overvoltage 4.1.2.4 Insulation coordination with regard to recurring peak voltage 4.1.3 Insulation coordination with regard to environmental conditions |
| 100 | 4.2 Voltages and voltage ratings 4.2.1 General 4.2.2 Rated insulation voltage UNm 4.2.3 Rated impulse voltage UNi 4.2.3.1 General 4.2.3.2 Method 1 |
| 101 | 4.2.3.3 Method 2 4.2.3.4 Contingency 4.3 Time under voltage stress 4.4 Pollution |
| 102 | 4.5 Insulating material 4.5.1 General 4.5.2 Comparative tracking index (CTI) |
| 103 | 5 Requirements and dimensioning rules for clearances 5.1 General 5.2 Minimum clearances 5.2.1 Functional insulation 5.2.2 Basic and supplementary insulation 5.2.3 Reinforced insulation 5.3 Contingency |
| 104 | 5.4 Clearances for altitudes higher than 2 000 m 6 Dimensioning rules for creepage distances 6.1 General 6.2 Minimum creepage distances 6.2.1 Functional, basic and supplementary insulations 6.2.2 Reinforced insulation |
| 105 | 7 Tests and measurements 7.1 General 7.2 Measurement of creepage distances and clearances 7.2.1 Method and values 7.2.2 Acceptance criteria 7.3 Verification of clearances by impulse test 7.3.1 Method and values |
| 106 | 7.3.2 Test acceptance criteria 7.4 Verification of clearances by power-frequency test 7.4.1 Method and values 7.4.2 Test acceptance criteria 7.5 Verification of clearances by d.c. voltage test 7.5.1 Method and values 7.5.2 Test acceptance criteria |
| 107 | 8 Specific requirements for applications in the railway field 8.1 General 8.2 Specific requirements for signalling 8.2.1 Overvoltage categories |
| 108 | 8.2.2 Rated impulse voltages 8.2.2.1 General 8.2.2.2 Equipment for outdoor use 8.2.2.3 Equipment for indoor use 8.2.3 Induced voltages 8.2.4 Installation instructions 8.2.5 Pollution degrees 8.3 Specific requirements for rolling stock 8.3.1 Determination of the rated impulse voltage UNi by method 1 |
| 109 | 8.3.2 Creepage distances 8.3.3 Roof installations 8.4 Specific requirements for fixed installations 8.4.1 Determination of the rated impulse voltage UNi by method 1 8.4.1.1 General 8.4.1.2 Definition of OV2 and OV3 and PD choice 8.4.1.3 Overhead contact lines |
| 110 | 8.4.2 Distances of outdoor insulators |
| 111 | Annex A (normative)Tables |
| 118 | Annex B (normative)Provisions for type and routine dielectric tests for equipment B.1 General B.2 Tests B.2.1 General B.2.2 Impulse test B.2.3 Power-frequency test |
| 119 | B.2.4 DC test |
| 120 | Annex C (normative)Methods of measuring creepage distances and clearances |
| 127 | Annex D (normative)Correlation between Un and UNm |
| 128 | Annex E (informative)Macro-environmental conditions |
| 129 | Annex F (informative)Application guide F.1 Introduction F.2 Determination of minimum clearances and creepage distances F.2.1 Sections F.2.2 Use of method 1 and 2 for determining UNi |
| 130 | F.2.3 How to determine minimum clearances and creepage distances |
| 133 | F.2.4 Pollution F.2.5 Creepage distances F.2.6 Insulations F.2.6.1 Types of insulation |
| 134 | F.2.6.2 Supplementary insulation F.2.6.3 Double insulation F.2.6.4 Reinforced insulation F.2.7 Use of minimum distances for clearances and creepage distances |
| 135 | F.2.8 Roof equipment for rolling stock F.2.9 Special cases of switching arrangements in fixed installations(see Table A.2, footnote c) F.2.10 Insulation conditions in fixed installations (see 8.4.1.2) F.3 Examples |
| 137 | F.4 Tests F.4.1 Measuring F.4.2 Testing |
| 139 | Annex ZZ (informative)Relationship between this European Standard and the Essential Requirements of EU Directive 2008/57/EC |
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BS EN 50124-1:2017
Railway applications. Insulation coordination – Basic requirements. Clearances and creepage distances for all electrical and…
