GB/T 25890.1-2026Railway applications - Fixed installations - DC switchgear - Part 1: General (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 1 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 supersedes GB/T 25890.1-2010 "DC Switchgear for Ground Installations in Rail Transit - Part 1: General Rules" and is consistent with...

Compared with GB/T 25890.1-2010, apart from structural adjustments and editorial changes, the main technical changes are as follows.

a) Modified the following parameters. "Switchgear", "Grounding switch", "Rated short-time withstand current", and "(Rated ground fault current of switchgear assembly)".

Terms and definitions (see 3.1.3, 3.1.7, 3.2.6, 3.2.7; 3.1.3, 3.1.7, 3.2.7, 3.2.8 in the 2010 edition);

b) The following terms have been removed. "Low-voltage limiter," "Voltage of surge arrester and low-voltage limiter," "Current of surge arrester and low-voltage limiter," and "Breakdown discharge." Terms and definitions for "exposed conductive parts," "gas circuit breaker," and "trip unit auxiliary switch" (see 3.1.8 of the 2010 edition).

3.2.1.6, 3.2.6, 3.2.25, 3.3.3, 3.4.2, 3.4.17);

c) Added the terms and definitions for "initial rise rate", "cutoff current limiting circuit breaker", and "hybrid DC circuit breaker" (see 3.2.25).

3.4.6.3, 3.4.22);

d) The standard characteristics of the auxiliary and control circuits have been changed (see 5.2, 2010 version 5.2);

e) The requirements for the power frequency withstand voltage test voltage frequency have been changed (see 7.5.2, 2010 version 7.5.2);

f) The determination of the critical current was added (see 7.9);

g) The environmental conditions for outdoor surge arresters and low-voltage limiters have been removed (see B.1 of the 2010 edition).

This document is modified to adopt IEC 61992-1:2014 "DC switchgear for ground installations on rail transport - Part 1: General".

Compared with IEC 61992-1:2014, this document has undergone the following structural adjustments.

---Appendix A corresponds to Appendix C in IEC 61992-1:2014;

---Appendix C corresponds to Appendix D in IEC 61992-1:2014;

---Appendix D corresponds to Appendix E in IEC 61992-1:2014;

---Appendix E corresponds to Appendix A in IEC 61992-1:2014.

The technical differences between this document and IEC 61992-1:2014, and the reasons therefor, are as follows.

---IEC 60050-446:1983 and GB/T 2900.36-2021 have been replaced by the normatively referenced GB/T 2900.17-2024.

The standards IEC 60050-811:1991, GB/T 14048.1-2023, and GB/T 14048.5-2017 have replaced IEC 60947.

(Some parts) (see Chapter 3), GB/T 32350.1-2025 replaces EN50124-1:2001 and IEC 62271-200:2024 it replaces IEC 62271-200:2002 (see Chapter 3, 4.2, 7.5.2) to adapt to my country's technical conditions and increase operability;

---Due to the removal of content related to DC surge arresters and low-voltage limiters, the normative reference IEC 60099-1:1999 (see [link to IEC 60099-1:1999]) has also been removed.

Chapter 3, B.1 of IEC 61992-1:2014 and IEC 60099-4:2004 (see Chapter 3 of IEC 61992-1:2014) 3.2.6.2, B.1), to adapt to the industry system architecture;

---The following sections have been removed from IEC 61992-1:2014.3.1.8 "Low-voltage limiter", 3.2.1.6 "Voltage of surge arresters and low-voltage limiters", and 3.2.6 "Current of surge arresters and low-voltage limiters", 3.2.25 "Breakdown discharge", 3.3.3 "Exposed conductive parts" and 3.4.17 "Trip block auxiliary" the terminology and definition of "auxiliary switch" have been revised, and the terminology and definition of "operation" in section 3.1.13 have been modified for ease of use.

---The sections 3.1, 4.1, Chapter 6, and B.6 of IEC 61992-2:2014 that could be agreed upon by the "manufacturer" and "user" have been deleted, explicitly requiring...

Please make it easy to use;

---Added normative reference to GB/T 25890.2-2026 (see 4.2, Chapter 6, A.2) to enhance operability;

---Added normative references to GB/T 25890.3-2026, GB/T 25890.4-2026, and GB/T 25890.5-2026.

(See 4.2 and Chapter 6) to increase operability;

---IEC 60850:2000 (see 5.1.3) has been replaced with the normatively referenced GB/T 1402-2025 to adapt to my country's technical conditions;

---The standard rated operating current of the main circuit has been changed (see 5.1.4) to suit my country's technical conditions;

---The standard characteristics of the auxiliary and control circuits have been changed, replacing the normative reference GB/T 13539.1-2015.

IEC 60269-1:1998 (see 5.2) to adapt to my country's technical conditions;

---IEC 60060-1:1989 has been replaced with the normatively referenced GB/T 16927.1-2011, which modifies the power frequency withstand voltage test.

The voltage and frequency requirements (see 7.5.2) are to be adapted to my country's technical conditions;

---The content of the impulse withstand voltage test has been modified (see 7.6.1) to adapt to my country's technical conditions;

---The determination of critical current has been added (see 7.9), increasing operability;

---The environmental conditions for outdoor surge arresters and low-voltage limiters in Annex B of IEC 61992-2:2014 have been removed from this document.

use;

---IEC 60721 (all parts) has been replaced by the normatively referenced GB/T 4798.3-2023 and GB/T 4798.4-2023.

GB/T 32578-2016 replaced IEC 60913:1988 (see B.1, B.6) to adapt to my country's technical conditions.

The following editorial changes have been made to this document.

---Including "load switch", "grounding switch", "(mechanical switching device) operation cycle, (mechanical switching device) manual operation", "power storage" "Operability", "(Switching device) Usage Category", "One-way Switching Device", "Two-way Switching Device", "Rated Voltage", "Auxiliary and Control Electricity" "Rated supply voltage of the circuit", "Power frequency withstand voltage level (dry test or wet test)", "Agreed free air heating current", "Agreed enclosed heating current" "Current flow", "(Circuit) loop time constant", "Power supply time constant", "Critical current", "Component", "(Main circuit of switchgear)" the appendices in the definitions of "(switching device) control circuit", "bushing", "line circuit breaker", "opening time" and "I²t characteristic of circuit breaker" are as follows.

Add information as a note (see 3.1.6, 3.1.7, 3.1.14, 3.1.15, 3.1.18, 3.1.20, 3.1.21, 3.1.22, 3.2.1.4, 3.2.1.5, 3.2.1.7, 3.2.3, 3.2.4, 3.2.13, 3.2.15, 3.2.19, 3.3.1, 3.3.8.2, 3.3.10, 3.3.20, 3.4.3, 3.4.21.1 3.4.21.8);

---IEC 61992-6 has been replaced by GB/T 4208-2017 (see 3.3.27.2~3.3.27.4) for informational reference;

---IEC 60466 (see 3.3.27.3) has been replaced by the informative reference IEC 62271-201, since IEC 60466 has been...

Replaces IEC 62271-201;

---The description of voltage values in note 5.1.1.1 of IEC 61992:2014 has been deleted;

---The research tests and unmentioned test procedure descriptions in Notes 2 and 3 of section 7.1 of IEC 61992:2014 have been deleted;

---The description of surge discharge test in note 7.5.1 of IEC 61992:2014 has been deleted;

---The description of the test procedure in note 7.5.2 of IEC 61992:2014 has been deleted.

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 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 1: General Provisions

1 Scope

This document specifies the operating conditions, requirements, standard characteristics, and specifications of DC switchgear and control equipment in the ground installation of the traction power supply system.

The standard settings and temperature rise limits are described, along with the relevant test methods.

This document applies to the nominal voltage for supplying power to public rail transit vehicles (such as urban rail transit, trams, and trolleybuses).

Ground electrical installations not exceeding DC 3000V.

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) Note. There are no technical differences between the content referenced in GB/T 1402-2025 and the content referenced in IEC 60850:2014.

GB/T 2900.17-2024 Electrical terminology for measuring relays and protective devices (IEC 60050-447:2020, IDT) GB/T 2900.20-2016 Electrical Terminology - High Voltage Switchgear and Controlgear (IEC 60050-441:1984, MOD) Note. The content referenced in GB/T 2900.20-2016 is not technically different from the content referenced in IEC 60050-441:1984.

GB/T 2900.36-2021 Electrical Terminology - Electric Traction (IEC 60050-811:2017, IDT) GB/T 2900.59-2008 Electrical Engineering Terminology - Power Generation, Transmission and Distribution Substations (IEC 60050-605:1983, MOD) Note. The content referenced in GB/T 2900.59-2008 has no technical differences from the content referenced in IEC 60050-605:1983.

GB/T 4798.3-2023 Classification of Environmental Conditions - Classification of Environmental Parameter Groups and Grading of Severity - Part 3: Environmental Conditions with Climate Protection for fixed use in protected locations (IEC 60721-3-3:2019, IDT) GB/T 4798.4-2023 Classification of Environmental Conditions - Classification of Environmental Parameter Groups and Grading of Severity - Part 4: No Weather Protection for fixed use in protected locations (IEC 60721-3-4:2019, IDT) GB/T 13539.1-2015 Low-voltage fuses – Part 1: Basic requirements (IEC 60269-1:2009, IDT) GB/T 14048.1-2023 Low-voltage switchgear and controlgear – Part 1: General (IEC 60947-1:2020, MOD) Note. There are no technical differences between the content referenced in GB/T 14048.1-2023 and the content referenced in IEC 60947-1:2020.

GB/T 14048.5-2017 Low-voltage switchgear and controlgear – Part 5-1.Electromechanical components of control circuits and switching elements Electrical control circuit (IEC 60947-5-1:2016, MOD) Note. The content referenced in GB/T 14048.5-2017 has no technical differences from the content referenced in IEC 60947-5-1:2016.

GB/T 16927.1-2011 High Voltage Testing Techniques – Part 1: General Definitions and Test Requirements (IEC 60060-1:2010) MOD) 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 25890.3-2026 DC switchgear for rail transit ground installations – Part 3: Indoor DC disconnect switches, negative...

Load switches and grounding switches (IEC 61992-3:2015, MOD)