GB/T 25890.2-2026Railway applications - Fixed installations - DC switchgear - Part 2: DC circuit breakers (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 2 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. Isolated 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 25890.2-2010 "DC Switchgear for Ground Installations in Rail Transit - Part 2: DC Disconnectors" Compared with GB/T 25890.2-2010, the main technical changes in the "Apparatus" are as follows, except for structural adjustments and editorial modifications.

a) Requirements for Class C circuit breakers and limits on cutoff current have been added (see 5.2);

b) The full breaking time requirement for Class V circuit breakers has been changed [see 5.2b), 2010 version 5.2b)];

c) Added classification codes for Class C circuit breakers (see Table 2);

d) The rated short-circuit breaking and making capacity of Class C circuit breakers has been increased (see 5.3.4.1);

e) Enhanced performance of Class C circuit breakers (see Table 3);

f) The small current time constant in the circuit breaker performance has been changed (see Table 3, Table 2 in the 2010 edition);

g) The test sequence for Class C circuit breakers has been increased (see Table 4);

h) Requirements for circuit breaker structural verification and performance have been added (see 6.1);

i) Increased the critical current (see 6.18);

j) The general requirements for power frequency withstand voltage testing have been modified (see 8.2.3.3.1, 2010 version 8.3.3.3.1);

k) Added test requirements and methods for Class C circuit breakers (see 8.2.8);

l) The test current and setting values of H, V, or S class circuit breakers have been changed (see 8.2.8.8.1, 8.3.8.7.3 in the 2010 version);

m) Added requirements for inspection classification, factory inspection, and type inspection (see 9.1~9.3);

n) The inspection items have been changed (see 9.4, 8.2 in the 2010 edition);

o) An AC short-circuit test method has been added (see Appendix B).

This document is modified to adopt IEC 61992-2:2014 "DC switchgear for ground installations on rail transit - Part 2: DC circuit breakers".

Compared with IEC 61992-2:2014, this document has undergone the following structural adjustments.

---Table 1 corresponds to Table 6 of IEC 61992-2:2014;

---Table 2 corresponds to Table 1 of IEC 61992-2:2014;

---Table 3 corresponds to Table 2 of IEC 61992-2:2014;

---Table 4 corresponds to Table 3 of IEC 61992-2:2014;

---The test requirements and methods for electrical and mechanical durability in section 6.12 are incorporated into sections 8.2.6 and 8.2.7;

---Table 6 corresponds to Table 7 of IEC 61992-2:2014;

---Incorporate the clauses of IEC 61992-2:2014 8.3.8.9 into the corresponding clauses of 8.2.8.1 to 8.2.8.8;

---The performance requirements for circuit breaker closing and short-circuit breaking in IEC 61992-2:2014, section 8.3.8.7.3, are incorporated into section 8.2.8.7.2.

In 8.2.8.8.1;

---Table 7 corresponds to Table 4 of IEC 61992-2:2014;

---Adjust paragraph B.3 of IEC 61992-2:2014 to subclauses B.3.1 to B.3.3.

The technical differences between this document and IEC 61992-2:2014, and the reasons therefor, are as follows.

---Some descriptive clauses have been changed to requirements (see 5.2, 8.2.2, 8.2.8.4) to adapt to my country's technical conditions and increase operability;

---IEC 60850:2000 (see 5.3.2) has been replaced with the normatively referenced GB/T 1402-2025 to adapt to my country's technical requirements.

Add components to increase operability;

---The voltage-related content for circuit breakers has been revised to requirements [see 5.3.2a) and 5.3.2f)] for ease of use;

---The clauses 5.3.1, 6.6, 6.14, 6.18, 7.1, 8.3.8.9.3, and 8.3.8.9.4 of IEC 61992-2:2014, which stated that the phrase "can be used by the manufacturer" was removed.

The agreed-upon terms and requirements should be clearly stated.

---EN50124-1:2001 (see 5.4, 5.5) has been replaced with the normatively referenced GB/T 32350.1-2025 to adapt to my country's national standards.

Technical conditions, increasing operability;

---Requirements for circuit breaker structural verification and performance have been added (see 6.1), specifying the requirements;

---The material requirements have been changed from a footnote to the main text (see 6.2) for easier use;

---The terms "clearances" and "creep distances" during cleaning operations have been changed from notes to the main text (see 6.4) for ease of use;

---IEC 61992-6:2006 (see 6.6, 6.9) has been replaced with the normatively referenced GB/T 25890.5-2026 to adapt to my country's national standards.

Technical conditions, increasing operability;

---Added critical current requirement (see 6.18), increasing operability;

---The semiconductor device content in the power frequency withstand voltage test has been revised to requirements (see 8.2.3.3.3) to adapt to my country's technical conditions and increase operability.

Actual nature;

---The experimental circuit calibration details have been modified (see 8.2.8.7.1) to improve operability;

---The verification requirements for the performance parameters f, ff, and fr of Class H, V, or S circuit breakers have been changed (see Table 5) for ease of use;

---The classification of inspections and the requirements for type inspections have been expanded (see 9.1~9.3) to adapt to my country's national conditions;

---Added clauses corresponding to technical requirements (see Table 7) to adapt to my country's national conditions.

The following editorial changes have been made to this document.

---The description of other specific disconnect media negotiated by both parties in Note 2 of section 5.2 of IEC 61992-2:2014 has been deleted;

---The symbol for the closing operation has been changed (see note in Table 4);

---The description of the mutual agreement on breaking capacity in note 5.3.4.2 of IEC 61992-2:2014 has been deleted;

---Note 6.18 of IEC 61992-2:2014 has been removed, which specifies the other standard configurations of circuit breakers provided by the manufacturer.

---The description of Class R circuit breakers in note 8.3.10 of IEC 61992-2:2014 has been deleted;

---The content of the feature information provided by the manufacturer has been changed (see A.3).

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 these devices is of paramount importance. GB/T 25890, "DC Switchgear for Ground Installations in Rail Transit," aims to define...

This document serves as a basis for the design, manufacture, and inspection of DC switchgear and control equipment used in ground installations of rail transit traction power supply systems. It is proposed to be drafted by eight [unclear - likely referring to organizations or entities].

It consists of several 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 traction power supply 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, as well as isolation voltage transmitters and other DC facilities for rail transit ground installations in traction power supply systems.

Operating conditions, characteristics, information exchange, inspection rules, and test methods of the voltage measurement equipment of the device.

DC switchgear for rail transit ground installations Part 2: DC Circuit Breakers

1 Scope

This document specifies the operating conditions, circuit breaker characteristics, structure and performance requirements, and signaling specifications for DC circuit breakers in the ground installation of the traction power supply system.

Information and labeling, inspection rules, and related test methods are described.

This document applies to the parameter selection, structural design, and inspection of DC circuit breakers for ground equipment in traction power supply systems.

Note. This document does not specify requirements for switchgear assemblies, electromagnetic compatibility (EMC), and reliability, which are specified in other parts of GB/T 25890.

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 1402-2025 Voltage of Traction Power Supply System for Rail Transit (IEC 60850:2014, MOD) 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 has no technical differences from the content referenced in IEC 61992-1:2014.

GB/T 25890.5-2026 DC switchgear for ground installations in rail transit - Part 5: DC switchgear assemblies (IEC 61992-6:2020, MOD) GB/T 32350.1-2025 Railway Transportation Insulation Coordination Part 1: Basic Requirements - Electrical Clearances and...

Creepage distance (IEC 62497-1:2010, MOD)

3 Terms and Definitions

The terms and definitions defined in GB/T 25890.1-2026 apply to this document.

4 Working conditions

The environmental conditions for the equipment shall comply with the provisions of section 4.1 of GB/T 25890.1-2026.

5 Circuit Breaker Characteristics