GB/T 25890.1-2010 Railway applications—Fixed installations—DC switchgear—Part 1: General (Text of Document is in English) - Beijing translation compay

Contents
Foreword
1 Scope
2 Normative References
3 Terms and definitions
3.1 General terms
3.2 Performance characteristics
3.3 Components
3.4 Terms relating to d.c. circuit-breakers, switch-disconnectors and associated relays
4 Service conditions and requirements
4.1 Environmental conditions
4.2 Insulation levels
5 Standard features and conventional assumptions
5.1 Standard features and conventional parameters for the main circuit
5.2 Standard features for auxiliary and control circuits
6 Temperature-rise limits
7 Tests
7.1 General
7.2 Test tolerances
7.3 Tests on movable devices
7.4 Temperature-rise test
7.5 Dielectric tests
7.6 Short-circuit and load-switching conditions
7.7 Verification of the behaviour during short-time withstand current test
7.8 Verification of the manual control device for sturdiness and position indicator reliability
Annex A (Normative) Diagrams for tests
Annex B (Normative) Environmental conditions for indoor installations
Annex C (Normative) Search of critical currents for d.c. circuit-breakers and switches
Annex D (Informative) Recommended creepage distances
Annex E (Informative) Determination of maximum energy fault location
Annex NA (Informative) Correspondence between Normative References and National Standard
Bibliography