GB/T 25890.5-2026Railway applications - Fixed installations - DC switchgear - Part 5: DC switchgear assemblies (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting.

This document is Part 5 of GB/T 25890 "DC Switchgear for Ground Installations in Rail Transit". GB/T 25890 has been issued.

The following parts were laid out.

---Part 1: General Provisions;

---Part 2: DC Circuit Breakers;

---Part 3: Indoor DC disconnect switches, load switches and grounding switches;

---Part 4: Outdoor DC disconnect switches, load switches and grounding switches;

---Part 5: DC Switchgear Assemblies;

---Part 7-1.Application Guidelines for Dedicated Measurement, Control, and Protection Devices for DC Traction Power Supply Systems;

---Part 7-2.Dedicated Measurement, Control, and Protection Devices for DC Traction Power Supply Systems. Isolation Current Transmitters and Other Current Measurements equipment;

---Part 7-3.Dedicated Measurement, Control, and Protection Devices for DC Traction Power Supply Systems. Isolated Voltage Transmitters and Other Voltage Measurement Devices equipment.

This document replaces GB/T 25890.6-2010 "DC switchgear for ground installations in rail transit - Part 6: DC switchgear assemblies".

Compared with GB/T 25890.6-2010, the main technical changes in the "Relevant Equipment" standard, apart from structural adjustments and editorial modifications, are as follows.

a) Added terms and definitions for internal arc, rated short-circuit current under internal arc, and the measured compartment (see 3.1, 3.2, 3.3);

b) The grounding was changed (see 6.5, 2010 edition of 6.5);

c) An additional requirement for the rated short-circuit current INarc under internal arcing conditions has been added (see 6.6.2);

d) The test voltage in the electrical performance test has been changed to an AC voltage with a root mean square value of 2UNe (see 6.19, 2010 edition).

8.3.8);

e) An internal arc type test item has been added (see Table 2 and 8.3.9);

f) A method for testing under conditions where an electric arc is generated due to an internal fault has been added (see Appendix B).

This document is modified to adopt IEC 61992-6:2020 "DC switchgear for ground installations on rail transit - Part 6: DC switchgear assemblies".

"Shut down equipment".

This document has undergone the following structural adjustments compared to IEC 61992-6:2020.

---A basic requirement 6.5.1 has been added, and subsequent numbering has been adjusted accordingly;

---The first two paragraphs of section 6.12 in Chapter 6 correspond to the suspension section of 8.3.7 in IEC 61992-6:2020; sections 6.18.1 and 8.3.4.1 in Chapter 6 correspond to...

Section 8.3.4.1 of IEC 61992-6:2020, and sections 6.18.3 and 8.3.4.3 of Chapter 6 correspond to section 8.3.4.3 of IEC 61992-6:2020.

Sections 6.19 and 8.3.8 in Chapter 6 correspond to 8.3.8 of IEC 61992-6:2020;

---Chapter 8.2 corresponds to 8.1 in IEC 61992-6:2020; Chapter 8.1.2 corresponds to 8.2 in IEC 61992-6:2020.

This document differs technically from IEC 61992-6:2020.The specific technical differences and their reasons are as follows.

---EN50124-1 (see Chapter 4) has been replaced with GB/T 32350.1-2025 (normatively referenced), and GB/T 25890.3 has been replaced.

IEC 61992-3 (see 6.5.2, 6.10.4, 8.3.5.1) was replaced by GB/T 1408.1, replacing IEC 60243-1 (see 8.3.3.1).

GB/T 4208-2017 replaced IEC 60529:1989 (see 6.6.1, 8.3.6) to be applicable to my country's technical conditions, and added provisions for compliance with national standards.

Operability;

---The test voltage in the electrical performance test has been changed to an AC voltage with a root mean square value of 2UNe to meet the actual test requirements (see...).

6.19);

---The test was changed to inspection rules and test methods to adapt to my country's national conditions (see Chapter 8).

The following editorial changes have been made to this document.

---The file name has been changed;

---URLs have been removed from terms and definitions;

---References have been added.

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed by the National Railway Administration.

This document is under the jurisdiction of the National Technical Committee on Standardization of Rail Transit Electrical Equipment and Systems (SAC/TC278).

Introduction

In the rail transit sector, DC switchgear is a crucial power transmission and distribution device in traction power supply systems, and its performance significantly impacts the traction power supply system.

The safe and reliable operation of [the system] is of great importance.

GB/T 25890 "DC Switchgear for Ground Installations in Rail Transit" is proposed to consist of 8 parts.

---Part 1: General Provisions. The purpose is to specify the operating conditions of DC switching and control equipment in the ground installation of the traction power supply system.

Parts and requirements, standard characteristics and general settings, temperature rise limits and test methods.

---Part 2: DC Circuit Breakers. The purpose is to specify the operating conditions and circuit breaking parameters of DC circuit breakers in the ground installations of traction power supply systems.

Instrument characteristics, structure and performance requirements, information and labeling, inspection rules and test methods.

---Part 3: Indoor DC disconnect switches, load switches, and grounding switches. The purpose is to specify the requirements for ground installations in traction power supply systems.

Operating conditions, switching characteristics, structural and performance requirements, information and standards for indoor DC disconnect switches, load switches and grounding switches Identification, inspection rules, and test methods.

---Part 4: Outdoor DC Disconnect Switches, Load Switches, and Grounding Switches. The purpose is to specify the requirements for ground installations in traction power supply systems.

Operating conditions, switching characteristics, structural and performance requirements, information and standards for outdoor DC disconnect switches, load switches and grounding switches.

Identification, inspection rules, and test methods.

---Part 5: DC Switchgear Assemblies. The purpose is to specify the operating procedures for DC switchgear assemblies in ground installations of traction power supply systems.

Operating conditions, characteristics, structure and performance requirements of complete sets of equipment, information and labeling, inspection rules and test methods.

---Part 6-1.General Requirements for Dedicated Measurement, Control, and Protection Devices for DC Traction Power Supply Systems. The purpose is to specify the requirements for DC traction power supply systems.

Characteristics and parameters of measurement, control and protection devices in the power supply system.

---Part 6-2.Dedicated Measurement, Control, and Protection Devices for DC Traction Power Supply Systems. Isolation Current Transmitters and Other Current Measurements Equipment. The purpose is to specify the ground-mounted isolation current transmitters and other equipment used in DC facilities for rail transit systems.

Operating conditions, characteristics, information exchange, inspection rules, and test methods of ground-based current measurement equipment.

---Part 6-3.Dedicated Measurement, Control, and Protection Devices for DC Traction Power Supply Systems. Isolated Voltage Transmitters and Other Voltage Measurement Devices Equipment. The purpose is to specify isolation voltage transmitters and other voltage measurement equipment used in DC facilities for rail transit and ground installations.

Requirements for equipment. The purpose is to specify the isolation voltage transmitters for ground installations in traction power supply systems and other DC equipment used in rail transit.

Operating conditions, characteristics, information exchange, inspection rules, and test methods of voltage measurement equipment for ground installations.

DC switchgear for rail transit ground installations Part 5: DC Switchgear Assemblies

1 Scope

This document specifies the operating conditions, characteristics, structure, and performance of DC switchgear assemblies in the ground installation of the traction power supply system.

Requirements, information and labeling, inspection rules and test methods.

This document applies to DC power supplies with a nominal voltage not exceeding 3000V in ground-mounted traction power supply systems, whether metal-cased or non-metal-cased.

Structural design and inspection of complete sets of switchgear.

Individual units within a complete assembly, such as circuit breakers, shall be designed, manufactured, and tested individually in accordance with GB/T 25890.2-2026.

conduct.

Note 1.This document mainly includes the overall requirements for the interaction between the enclosure and the equipment inside the enclosure.

Note 2.Electromagnetic compatibility (EMC) is defined in GB/T 24338.6, and additional requirements for reliability (RAMS) are defined in GB/T 21562.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 1408.1 Electrical strength test methods for insulating materials – Part 1: Power frequency test (GB/T 1408.1-2016) IEC 60243-1:2013, IDT GB/T 4208-2017 Degrees of protection provided by enclosures (IP code) (IEC 60529:2013, IDT) GB/T 25890.1-2026 DC switchgear for ground installations in rail transit – Part 1: General principles (IEC 61992-1.

2014, MOD)

Note. The content referenced in GB/T 25890.1-2026 is not technically different from the content referenced in IEC 61992-1:2006.

GB/T 25890.2-2026 DC switchgear for rail transit ground installations - Part 2: DC circuit breakers (IEC 61992-2:2014, MOD) Note. The content referenced in GB/T 25890.2-2026 is not technically different from the content referenced in IEC 61992-2:2006.

GB/T 25890.3 DC switchgear for rail transit ground installations - Part 3: Indoor DC disconnect switches and load switches Grounding switch (GB/T 25890.3-2026, IEC 61992-3:2015, MOD) GB/T 25890.7-2010 DC Switchgear for Ground Installations in Rail Transit - Part 7-1.DC Traction Power Supply Systems Application Guidelines for Measurement, Control and Protection Devices (IEC 61992-7-1:2006, IDT) GB/T 32350.1-2025 Railway Transportation Insulation Coordination - Part 1: Clearances and Creepage Distances for Electrical and Electronic Equipment

3 Terms and Definitions

The terms and definitions defined in GB/T 25890.1-2026, as well as the following terms and definitions, apply to this document.