GB/T 25890.4-2026Railway applications - Fixed installations - DC switchgear - Part 4: Outdoor d. c. disconnectors, switch-disconnectors and earthing switches (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 4 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 25890.4-2010 "DC Switchgear for Ground Installations in Rail Transit - Part 4: Outdoor DC Isolation Equipment".

"Off-grid Switches, Load Switches and Grounding Switches", compared with GB/T 25890.4-2010, except for structural adjustments and editorial changes, the main technical differences are as follows.

The changes are as follows.

a) The scope has been changed (see Chapter 1, Chapter 1 of the 2010 edition);

b) The voltage specifications for rated breaking and making capabilities have been changed (see 5.3.3, 2010 version of 5.3.3);

c) The functional definition of Class V switches in the switch types has been changed (see Table 1, Table 1 in the 2010 version);

d) The requirement that switches conform to the production drawings has been added (see 6.1);

e) The requirements for both buyers and sellers have been removed (see 6.14 in the 2010 edition);

f) The position requirements for the terminals in the main circuit connection have been changed (see 6.6, 2010 version of 6.6);

g) The type of switch used in the closing capability test has been changed (see 8.2.8.4, 8.3.8.4 in the 2010 version);

h) The type of operating switch applicable to the test has been changed (see 8.2.10, 8.3.10 in the 2010 version);

i) General requirements for inspection rules have been added (see 9.1);

j) The inspection items have been changed (see Table 3, Table 2 in the 2010 edition).

This document is modified to adopt IEC 61992-4:2015 "DC switchgear for ground installations on rail transit - Part 4: Outdoor DC isolation".

"Leave the switch, load switch and grounding switch".

Compared with IEC 61992-4:2015, this document has undergone the following structural adjustments.

---8.2 corresponds to 8.3 of IEC 61992-4:2015;

---Chapter 9 and 9.1 "General Requirements" have been added;

---9.2 corresponds to 8.2 of IEC 61992-4:2015.

This document differs technically from IEC 61992-4:2015; the relevant clauses are indicated by vertical single characters in the margin.

The lines (|) are marked. The specific technical differences and their reasons are as follows.

---The scope has been changed (see Chapter 1) to suit my country's national conditions;

---The normative reference document has been changed, replacing IEC 61992-1:2006 with GB/T 25890.1-2026 (see Chapter 3, 5.3~).

5.6, 6.1, 6.2, 6.4, 6.10, 6.11, 7.2, 8.1, 8.3, 9.2) replaced EN50124-1 with GB/T 32350.1 (see GB/T 32350.1).

Chapters 4, 5.5, and 5.6) replace IEC 60529:1989 (see 5.2, 6.9, and 8.2.7) with GB/T 4208-2017.

GB/T 1402-2025 replaces IEC 60850 (see 5.3.2), and GB/T 25890.5-2026 replaces IEC 61992-6:2006 (see 6.7, 6.9), replaced IEC 62271-102 (see 6.12, 8.2.7) with GB/T 1985-2023.

GB/T 11022-2020 replaces IEC 60694:1996 (see 8.2.1.2) to adapt to my country's technical conditions and increase operability.

Actual nature;

---Added information on whether the product meets the requirements of the production drawings (see 6.1), clarifying the requirements;

---The notes in sections 6.2 and 6.4 have been changed to main text (see sections 6.2 and 6.4) to clarify requirements and facilitate use;

---The requirements for the position of the wiring terminals in the main circuit connection have been changed (see 6.6), clarifying the requirements and facilitating use;

---Content that could be agreed upon by the manufacturer and user has been removed (see IEC 61992-4:2015, 6.6, 6.12, 6.18, 8.3.5, 8.3.6).

8.3.8.2 and 8.3.8.4) clearly define the requirements and facilitate use;

---Type testing requirements have been added (see Chapter 9) to adapt to my country's national conditions;

---The section "Test Items and Test Order" has been changed to "Inspection Items" (see 9.2) to better suit my country's national conditions;

---Added clauses on inspection classification and technical requirements (see Table 3) to adapt to my country's national conditions.

The following editorial changes have been made to this document.

---Informative reference to IEC 60694:1996 (see Chapter 4 of IEC 61992-4:2015) has been removed; use GB/T 32347.2 and GB/T 32578 replaces EN50125-2.200 and IEC 60913 (see Chapter 4, IEC 61992-4:2015).

Chapter 4), and move it to the references;

---The test method for the protection level of switch enclosures in IEC 61992-4:2015, section 6.9, is incorporated into section 8.2.7 to adapt to my country's national conditions.

National conditions;

---Incorporate the electrical and mechanical durability, operational test requirements and methods under icing conditions from section 6.12 of IEC 61992-4:2015.

8.2.5, 8.2.6, and 8.2.7 are adapted to my country's national conditions;

---Note 8.3.1.2 in IEC 61992-4:2015 has been amended (see 8.2.1.2);

---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 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 installations 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. 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 4: Outdoor DC Disconnect Switches Load switches and grounding switches

1 Scope

This document specifies the operating conditions, switch...

Characteristics, structural and performance requirements, information and labeling, inspection rules, and related test methods are described.

This document applies to the selection and inspection of outdoor DC disconnect switches, load switches, and grounding switches in ground installations of traction power supply systems.

This document does not apply to requirements for switchgear assemblies, electromagnetic compatibility (EMC), and reliability.

Note 1.Requirements for switchgear assemblies, electromagnetic compatibility (EMC) and reliability are specified in other parts of GB/T 25890.

Note 2.In this document, "switch" refers to "DC disconnect switch, load switch or connection switch" as defined in 3.1.5, 3.1.6 and 3.1.7 of GB/T 25890.1-2026.

Ground switch.

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 1985-2023 High-voltage AC disconnecting switches and grounding switches (IEC 62271-102:2022, MOD) GB/T 4208-2017 Degrees of protection provided by enclosures (IP code) (IEC 60529:2013, IDT) GB/T 11022-2020 Common technical requirements for high voltage switchgear and controlgear standards (IEC 62271-1:2017, MOD) GB/T 25890.1-2026 DC switchgear for ground installations in rail transit – Part 1: General principles (IEC 61992-1.

2014, MOD)

GB/T 25890.5-2026 DC switchgear for rail transit ground installations - Part 5: DC switchgear assemblies (IEC 61992-5:2020, MOD) GB/T 32350.1 Railway Transportation - Insulation Coordination - Part 1: Basic Requirements - Clearances and Creepage Distances of Electrical and Electronic Equipment (GB/T 32350.1-2025, IEC 62497-1:2013, MOD)

3 Terms and Definitions

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

4 Working conditions

Outdoor switch installation requirements are specified in GB/T 32347.2, and relevant requirements of GB/T 32578 may also be considered. The normal operating conditions specified in this document...

The level of soiling it can withstand is PD4A (see GB/T 32350.1).

The environmental rating will vary depending on the standards mentioned above. If special specifications or specific environmental requirements are needed, the user should specify them in the tender documents.

Note that the manufacturer should confirm that the switch meets the relevant requirements.