GB/T 32580.3-2026Railway applications - Fixed installations - High voltage AC switchgear and transformers - Part 3: Current transformers (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 3 of GB/T 32580 "High-voltage AC switchgear and instrument transformers for ground installations in rail transit".

GB/T 32580 has published the following parts.

---Part 1: Circuit Breakers;

---Part 2: Disconnecting switches, grounding switches, and load switches;

---Part 3: Current Transformers;

---Part 4: Voltage Transformers;

---Part 5.27.5kV and 2×27.5kV metal-enclosed switchgear and controlgear.

This document replaces GB/T 32580.302-2016 "Special Requirements for AC Switchgear on Ground Installations of Rail Transit - Part 3-2" Part. Single-phase current transformers for dedicated measurement, control and protection devices of AC traction systems and GB/T 32580.301-2016 "Railway AC Traction Systems" Part 3-1 Special Requirements for AC Switchgear for Ground-based Installations. Dedicated Measurement, Control, and Protection Devices for AC Traction Systems this document is based on GB/T 32580.302-2016 and incorporates content from GB/T 32580.301-2016.

Compared with GB/T 32580.302-2016, apart from structural adjustments and editorial changes, the main technical changes are as follows.

a) The scope has been changed (see Chapter 1, Chapter 1 of GB/T 32580.302-2016);

b) The terms and definitions have been changed (see Chapter 3, Chapter 3 of GB/T 32580.302-2016);

c) The normal and special usage conditions have been changed (see Chapter 4, Chapter 4 of GB/T 32580.302-2016);

d) Features and applications have been removed (see Chapter 5 of GB/T 32580.302-2016);

e) The ratings have been changed (see Chapter 5, Chapters 6 and 7 of GB/T 32580.302-2016);

f) Increased requirements for liquids used in the equipment, solid materials used in the equipment, unified creepage distance reference for external insulation, and protection of the enclosure.

Protection rating, corrosion, fire hazard, structural requirements, insulating oil performance requirements, sealing performance, and mechanical strength requirements (see 6.1, 6.2).

(6.5~6.7, 6.9, 6.11~6.14)

g) Changes were made to contamination, temperature rise requirements for parts and components, grounding requirements for equipment, markings, requirements for outgoing terminals, and transmission of electrical current.

Pressure (see 4.1.4, 6.3, 6.4, 6.8, 6.10, 6.15, and 8.1~8.5 of GB/T 32580.302-2016);

h) The information that the buyer should specify, the information that the supplier should specify, and other requirements (see GB/T 32580.302-2016) have been removed.

8.6~8.8);

i) Additional experimental methods have been added (see Chapter 7);

j) Added inspection rules (see Chapter 8);

k) Added information provided during inquiries, bidding, and ordering (see Chapter 9);

l) Added rules for transportation, storage, installation, operation, and maintenance (see Chapter 10);

m) Added relevant security provisions (see Chapter 11);

n) Increased the product's environmental impact (see Chapter 12);

o) Additional documentation has been added to accompany the product (see Appendix D).

This document is modified to adopt IEC 62505-3-2:2020 "Particular requirements for AC switchgear on ground installations of rail transit - Part 3-2".

Part. Current transformers for measurement, control and protection devices for AC traction systems and IEC 62505-3-1:2020 "Railway ground Part 3-1.Special Requirements for AC Switchgear. Application Guidelines for Measurement, Control and Protection Devices for AC Traction Systems.

This document has undergone significant structural adjustments compared to IEC 62505-3-2:2020 and IEC 62505-3-1:2020.The three documents...

See Appendix A for a list of structural number correspondences.

The technical differences between this document and IEC 62505-3-2:2020 and IEC 62505-3-1:2020, and the reasons therefor, are as follows.

---The scope has been revised (see Chapter 1) to suit my country's technical conditions and facilitate the use of the standard;

---Added provisions for GB/T 2900.1, GB/T 2900.19, GB/T 2900.20, GB/T 2900.49 (see Chapter 3) and GB/T 7595-2017 (see 6.12), GB/T 26218.1-2010 (see 4.1.4), GB/T 32580.5 (see 6.4, 6.5), the normative references in TB/T 2805-2021 (see 6.5) have been deleted, replacing the normative references in IEC 62505-3-2:2020.

IEC 60850:2014, IEC 62236-5:2018, and IEC 62497-1:2010 are used to adapt to my country's technical conditions and increase operability.

Actual nature;

---Terminology and definitions have been changed, and abbreviations in section 3.2 of IEC 62505-3-2:2020 (see Chapter 3) have been removed to adapt to my country's technical requirements.

Components that facilitate standard use;

---The normal and special usage conditions have been changed (see Chapter 4) to facilitate standard use;

---The ratings have been changed (see Chapter 5) to facilitate standard use;

---The design and structure have been modified (see Chapter 6) to facilitate standard use;

---The test methods have been modified (see Chapter 7) to facilitate the use of the standard;

---Inspection rules have been added (see Chapter 8) to facilitate the use of the standard;

---Changes have been made to the application of traction power supply system-specific measurement, control, and protection devices, as per section 4 of IEC 62505-3-1:2020.

The normative content of Chapter 1, Chapter 5, and Appendix A has been changed to informative content (see Appendix B and Appendix C) to better suit my country's national conditions.

---A normative appendix, "Documents Accompanying the Product" (see Appendix D), has been added to facilitate the use of the standard.

The following editorial changes have been made to this document.

---To align with my country's standards system, the title of this document has been changed to "High-voltage AC switchgear and mutual inductors for ground installations in rail transit".

Part 3: Current Transformers;

---IEC 60850:2014 (see B.1, B.2.2) and GB/T 24338.6 have been replaced by the informatively referenced GB/T 1402-2025.

GB/T 32350.1-2025 replaced IEC 62236-5:2018 (see B.2.1, B.2.4) and GB/T 32350.1-2025 replaced IEC 62497-1.

(See B.2.1), GB/T 32580.2-2026 replaces IEC 62505-2:2016 (see B.2.3), GB/T 32580.4 replaces IEC 62505-3-3 (see B.2.3), GB/T 28027-2011 replaces IEC 62313:2009 (see C.2.3.1);

---Informative Annex B, "Guide to the Application of Control Principles," of IEC 62505-3-1:2020 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

GB/T 32580 "High-voltage AC switchgear and instrument transformers for ground installations in rail transit" aims to ensure the traction power supply system of rail transit.

To improve the product quality of major equipment, ensure transportation safety, meet the development needs of the railway industry, promote standardization, and align with international market standards, it is proposed to...

It consists of five parts.

---Part 1: Circuit Breakers. The purpose is to specify the requirements for application and environmental conditions, including ratings, design, manufacture, and type.

The document outlines requirements for testing and factory testing, and specifies rules for transportation, storage, installation, operation, and maintenance, as well as safety and the product's environmental impact.

The document provides guidance on the impacts of various factors, offering suggestions for the design, manufacture, and use of 27.5kV, 2×27.5kV, and 55kV AC circuit breakers.

Standards and basis.

---Part 2: Disconnecting Switches, Grounding Switches, and Load Switches. The purpose is to specify the scope of use and environmental requirements, from...

Requirements are specified for rated values, design and manufacturing, type testing, and factory testing. A selection guide for disconnecting switches is also provided, which should be included with the order.

The documents provided together with the tender and inquiry form, as well as the rules for transportation, storage, installation, operation and maintenance, safety, and the product's environmental impact, are required.

The document provides guidance on the impact of various factors, including the requirements for 27.5kV, 2×27.5kV, and 55kV AC disconnect switches, grounding switches, and load switches.

It provides standards and guidelines for the design, manufacture, and use of related components.

---Part 3: Current Transformers. The purpose is to specify the requirements for application and environmental conditions, including ratings, design, and manufacturing.

Type testing and factory testing requirements are specified, along with the documents provided with the purchase order, tender, and inquiry form, as well as transportation details.

It provides guidance on transmission, storage, installation, operation and maintenance rules, safety, and the environmental impact of products, for 27.5kV and this provides standards and guidelines for the design, manufacture, and use of 55kV AC current transformers.

---Part 4: Voltage Transformers. The purpose is to specify the requirements for application and environmental conditions, including ratings, design, and manufacturing.

Type testing and factory testing requirements are specified, along with the documents provided with the purchase order, tender, and inquiry form, as well as transportation details.

It provides guidance on transmission, storage, installation, operation and maintenance rules, safety, and the environmental impact of products, for 27.5kV and this provides standards and guidelines for the design, manufacture, and use of 55kV AC voltage transformers.

---Part 5.27.5kV and 2×27.5kV Metal-Enclosed Switchgear and Controlgear. The purpose is to specify AC metal-enclosed...

Operating conditions, ratings, design and structure, type tests, factory tests, inspection rules, and operation of switchgear and control equipment.

Rules for transmission, storage, installation, operation and maintenance, and security requirements.

Rail Transit Ground Equipment High-voltage AC switchgear and instrument transformers Part 3: Current Transformers

1 Scope

This document specifies the normal and special operating conditions, rated values, design and structure, inspection rules, and inspection procedures for current transformers used in rail transit.

Information provided during inquiries, tenders, and orders; rules for transportation, storage, installation, operation, and maintenance; safety; the product's environmental impact; and descriptions of relevant regulations.

The experimental method.

This document applies to AC current transformers with an operating frequency of 50Hz and rated voltages of 27.5kV and 55kV.

Note. Current transformers are mainly used in measuring devices and protection equipment. Application guidelines for measuring, control, and protection devices are provided in Appendix B, AC traction power supply system feed...

The typical testing principle for the line is shown in Appendix C.

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 2900.1 Basic Terminology for Electrical Engineering GB/T 2900.19 Electrical Terminology. High Voltage Testing Techniques and Insulation Coordination GB/T 2900.20 Electrical Terminology - High Voltage Switchgear and Controlgear (GB/T 2900.20-2016, IEC 60050-441) 1984, MOD) GB/T 2900.49 Electrical Terminology - Power System Protection (GB/T 2900.49-2004, IEC 60050-448:1995, IDT) GB/T 7595-2017 Quality of Transformer Oil in Operation GB/T 20840.1-2010 Instrument Transformers - Part 1: General Technical Requirements (IEC 61869-1:2007, MOD) Note. The content referenced in GB/T 20840.1-2010 has no technical differences from the content referenced in IEC 61869-1:2007.

GB/T 20840.2-2014 Instrument Transformers - Part 2: Supplementary Technical Requirements for Current Transformers (IEC 61869-2:2012) MOD) Note. The content referenced in GB/T 20840.2-2014 has no technical differences from the content referenced in IEC 61869-2:2012.

GB/T 26218.1-2010 Selection and sizing determination of high-voltage insulators for use under polluted conditions - Part 1: Definitions and information and general principles (IEC/T S60815-1.2008, MOD) GB/T 32580.5 High-voltage AC switchgear and instrument transformers for ground installations in rail transit - Part 5.27.5kV and 2× 27.5kV metal-enclosed switchgear and control equipment TB/T 2805-2021 Insulation Level of Traction Power Supply Equipment

3 Terms and Definitions

Except for sections 3.2.1 to 3.2.9 of GB/T 20840.1-2010, GB/T 20840.1-2010, GB/T 20840.2-2014, the terms and definitions defined in GB/T 2900.1, GB/T 2900.19, GB/T 2900.20 and GB/T 2900.49 apply to this document.