GB/T 32350.1-2025Railway applications - Insulation coordination - Part 1: Basic requirements - Clearances and creepage distances for all electrical and electronic equipment (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 32350 "Insulation Coordination for Rail Transit". GB/T 32350 has already published the following parts.

---Part 1: Basic Requirements for Electrical Clearances and Creepage Distances in Electrical and Electronic Equipment;

---Part 2: Overvoltage and related protection.

This document replaces GB/T 32350.1-2015 "Insulation Coordination for Rail Transit - Part 1: Basic Requirements for Electrical and Electronic Equipment".

"Clearances and Creepage Distances". Compared with GB/T 32350.1-2015, the main technical changes are as follows, except for structural adjustments and editorial modifications.

as follows.

a) The scope has been changed (see Chapter 1, Chapter 1 of the 2015 edition);

b) The term "long-duration overvoltage" and its definition have been changed (see 3.5.1, 2015 version 3.5.1);

c) A definition for overhead contact lines has been added (see 3.7);

d) The method for determining the minimum rated impulse voltage and some of the values have been changed (see 4.2.3.2, Table B.2, 2015 version of 4.2.3.2).

Table A.2);

e) Requirements for electrical clearances and elevation correction requirements in the dimensional determination rules have been added (see 5.1, 5.2.1, 5.2.2);

f) An electrical clearance correction method has been added (see 5.4);

g) The method for determining the minimum creepage distance based on the rated insulation voltage UNm has been changed (see 6.2.1, 2015 version of 6.2.1);

h) The method for verifying electrical clearance by impulse voltage test has been modified (see 7.3.1, 2015 version of 7.3.1);

i) The method for verifying electrical clearance by power frequency voltage testing has been modified (see 7.4.1, 2015 version of 7.4.1);

j) The method for verifying electrical clearance by DC voltage test has been modified (see 7.5.1, 2015 version of 7.5.1);

k) The special requirements for contamination of signaling equipment have been changed (see 8.2.5, 2015 version of 8.2.5);

l) The requirements for dielectric testing methods for type inspection and factory inspection of equipment have been revised (see A.2.1, B.2.1 of the 2015 version);

m) Added equipment dielectric testing based on short-time power frequency (AC) tests corresponding to rated impulse voltages UNi of 135kV and 180kV.

Voltage (see Table A.1);

n) The rated insulation voltage value was changed from 30kV to 30.5kV, and the rated impulse voltage was specified separately for locomotives, rolling stock, and ground equipment.

Requirements (see Tables B.2 and C.1, and Tables A.2 and D.1 from the 2015 edition);

o) The rated insulation voltage has been increased to 31.5kV, along with the corresponding rated impulse voltage and applicable range requirements (see Table B.2 and Table C.1);

p) Linear interpolation requirements have been added (see Tables B.3, B.5, B.6, and B.8);

q) An altitude correction for electrical clearance has been added for circuits with a rated insulation voltage of 60kV and below used at altitudes above.2000m.

Coefficients and related requirements (see Table B.9);

r) Added clearance altitude correction for circuits with rated impulse voltage UNi exceeding 60kV used at altitudes above 1400m.

Coefficients and related requirements (see Table B.10).

This document is modified to adopt IEC 62497-1:2010 "Railway traffic - Insulation coordination - Part 1: Basic requirements for electrical and electronic equipment".

Clearance and creepage distance.

This document has undergone the following structural adjustments compared to IEC 62497-1:2010.

---Appendix A corresponds to Appendix B of IEC 62497-1:2010;

---Appendix B corresponds to Appendix A of IEC 62497-1:2010;

---Appendix C corresponds to Appendix D of IEC 62497-1:2010;

---Appendix D corresponds to Appendix E of IEC 62497-1:2010;

---Appendix E corresponds to Appendix C of IEC 62497-1:2010.

This document differs significantly from IEC 62497-1:2010 in several technical aspects. The relevant clauses are indicated in vertical margins.

The straight line (|) is marked. These technical differences and their reasons are as follows.

---Regarding normative references, this document has made adjustments due to technical differences to adapt to my country's technical conditions. The adjustments are as follows.

The changes are mainly reflected in Chapter 2, "Normative References," and the specific adjustments are as follows.

- IEC 60071-1 has been replaced by the normatively referenced GB/T 311.1 (see Tables B.2, F.1, F.2.9);

- IEC 60112 has been replaced by the normatively referenced GB/T 4207 (see 4.5.2.3);

- IEC 60587 has been replaced by the normatively referenced GB/T 6553 (see 4.5.2.3);

- IEC 60060-1 has been replaced with the normatively referenced GB/T 16927.1 (see 7.4.1, A.2.1);

- IEC 60664-1:2007 has been replaced by the normatively referenced GB/T 16935.1-2023; there is no consistency between the two documents.

For the correspondence between genders, see 7.3.1, 7.4.1, 7.5.1, A.2.1, F.1, and Table B.9).

- IEC 62236 (all parts) has been replaced with the normatively referenced GB/T 24338 (all parts) (see 5.3);

- Added normative reference to GB/T 25120-2023 (see Table B.2);

- IEC 60071-2:2023 has been added (see Table B.10).

---The terminology and definition of "long-duration overvoltage" have been revised to better reflect my country's national conditions (see 3.5.1);

---The term "overhead contact network" and its definition have been added to better reflect my country's national conditions (see 3.7);

---The circuit with a rated impulse voltage UNi exceeding 60kV has been modified to verify the electrical performance through impulse voltage, power frequency voltage, and DC voltage tests.

The altitude correction for air gaps is based on GB/T 311.1 to improve the operability of the standard (see 7.3.1, 7.4.1, and 7.5.1);

---The rated insulation voltage value has been changed from 30kV to 30.5kV, and corresponding specifications have been specified for locomotives, rolling stock, and ground equipment respectively.

Rated impulse voltage requirements; an insulation voltage value of 31.5kV and the corresponding rated impulse voltage have been added, along with footnotes f and g, and are consistent with...

It should be consistent with GB/T 1402 to conform to my country's national conditions (see Table B.2 and Table C.1);

---Note 1 of the requirements in Table B.2 has been changed to the table body (see Table B.2, IEC 62497-1:2010 AMD1.2013).

Table A.2);

---Added footnote e to Table B.2."For traction transformers, according to Table 8 of GB/T 25120-2023, the impulse voltage shall be taken as..." 150kV. This is to ensure consistency with national standards (see Table B.2).

---The scope of application of Table B.3 has been expanded to better reflect my country's national conditions (see Table B.3);

---Note 4 in Table B.3, which contains the requirements, has been modified to fit the content of the middle section of the table to conform to my country's national conditions (see Table B.3);

---Note 2 in Table B.5, which contains requirements, has been changed to the content of the middle section of the table to conform to my country's national conditions (see Table B.5);

---Note 1 in Table B.6, which contains the requirements, has been changed to the content of the middle section of the table to conform to my country's national conditions (see Table B.6);

---Note 2 in Table B.7, which contains requirements, has been changed to the content of the middle section of the table to conform to my country's national conditions (see Table B.7);

---Note 2 of Table B.8, which contains requirements, has been modified to include content in the middle of the table. The scope of application of Table B.8 has been expanded to better suit my country's national conditions (see...).

Table B.8);

---Notes 1 and 2 in Table B.9, which contain the requirements, have been changed to the content of the table sections to conform to my country's national conditions (see Table B.9);

---The altitude correction requirements for electrical clearances at altitudes of 1400m to.2000m have been changed; the requirements at altitude of 5000m have also been modified.

5100m, and its correction factor was adjusted accordingly to conform to my country's national conditions (see Table B.9);

---Notes 1 and 2 in Table B.10, which contain the required information, have been changed to the content of the table sections to conform to my country's national conditions (see Table B.10);

---The electrical clearance altitude correction requirements in Table B.10 for altitudes between 1400m and.2000m have been revised; changes have been made for altitudes exceeding 1400m.

The standard for calculating the altitude correction factor is IEC 60071-2:2023, which changed the correction factor for 4500m altitude and the sea level correction factor.

The elevation was changed from 5000m to 5100m, and the correction factor was adjusted accordingly to conform to my country's national conditions (see Table B.10).

The following editorial changes have been made to this document.

---Included in IEC 62497-1:2010/AMD1.2013, the outer margin of the relevant clauses is marked with a vertical double line (||).

It was marked;

---Added insulation coordination requirements for low-voltage electrical equipment with rated frequencies of 30kHz~10MHz (see Note 2 in Chapter 1);

---The definition of rated insulation voltage has been changed (see 3.4.4);

---Add "Two special transient overvoltages are defined as follows." to the note, and modify it to "Two special transient overvoltages include operation..." "Overvoltage and lightning overvoltage" (see 3.5.2);

---IEC 60529 has been replaced with GB/T 4208 (see 4.1.3) for informational reference;

---The description of the pollution level source has been changed (see "Note 3" in 4.4);

---EN50119 has been replaced with GB/T 32578 (see Chapter 1, 8.4.1.3) which is cited in the informational reference;

---IEC 60507 has been replaced with GB/T 4585, and the citation style has been modified to include it in the references (see A.1);

---IEC 61245 has been replaced with GB/T 22707, and the citation style has been modified to include it in the references (see A.1);

---The description regarding the minimum value of UNi that can be specified in national standards has been deleted (see Table B.1 of IEC 62497-1:2010 AMD1.2013).

Note 4);

---Added examples of PD2, PD3, and PD4 in the equipment box in Table D.1 (see Table D.1);

---Examples 1 to 11 have been changed to Figures E.1 to E.11 (see Figures E.1 to E.11);

---The requirement in step 2 of Figure F.1 regarding determining the rated insulation voltage of this part of the circuit in locomotives and rolling stock has been modified (see Figure F.1);

---A new header for Table F.1 has been added, and the overvoltage category OV2 in part 2 of Table F.1 has been changed to OV3 (see Table F.1).

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

Insulation coordination refers to selecting the electrical insulation characteristics of equipment based on its use and surrounding environment. Only designs based on expected lifespan...

Equipment can only achieve insulating fit when subjected to stresses (such as voltage) during a strike. Insulating fit is the process between equipment and between components within equipment.

The selection, dimensional determination, and interrelationships of insulation are considered. When determining insulation dimensions, electrical stress and environmental conditions are taken into account, even under the most severe conditions.

The following requirements must be met. First, ensure that the insulation performance is not damaged; second, avoid unnecessarily excessive insulation dimensions. GB/T 32350 "Insulation Distribution for Rail Transit" the "Insulation Coordination" aims to specify insulation coordination under specific conditions for rail transit applications and is proposed to consist of two parts.

---Part 1: Basic Requirements for Electrical Clearances and Creepage Distances in Electrical and Electronic Equipment. The purpose is to determine clearances and creepage distances for applications in rail transit.

Insulation coordination.

---Part 2: Overvoltage and Related Protection. The purpose is to determine the simulation and testing of transient overvoltage protection for power supply-related equipment.

Require.

Rail transit insulation coordination Part 1: Basic Requirements for Electrical and Electronic Equipment Clearance and creepage distance

1 Scope

This document specifies insulation coordination in rail transit applications and applies to signaling equipment, rolling stock equipment, and ground equipment.

Insulation coordination refers to the selection, dimensional determination, and interrelationship of insulation between equipment and between various components within equipment. When determining insulation dimensions...

Considering electrical stress and environmental conditions, the determined insulation dimensions are also the same when the electrical stress and environmental conditions are the same.

The purpose of insulation matching is to avoid unnecessarily large insulation dimensions.

This document stipulates that.

---Electrical clearance and creepage distance requirements for equipment;

---General requirements for insulation coordination tests.

The term "equipment" in the above definition refers to "part" in 3.3, and can be applied to a system, subsystem, device, part of an equipment, or equipotential bonding.

A physical realization of.

This document does not cover.

---Insulation distance through solids or liquids;

---Insulation distance through gases other than air;

---Insulation distance through air under non-standard pressure;

---Equipment used under extreme conditions.

This document is the foundational standard for product standards.

However, due to safety and/or reliability reasons, such as signal equipment; or due to the special operating environment of the product itself, such as overhead contact lines.

If there are existing standards or regulations (such as GB/T 32578), product standards can be adjusted to meet different requirements.

This document specifies the dielectric test (type test or factory test) for the equipment, see Appendix A.

Note 1.For systems with strict safety requirements, special requirements are required, which are specified in the product-specific signal standard GB/T 28809.

Note 2.For low-voltage electrical equipment with a rated frequency of 30kHz~10MHz, considering high-frequency voltage stress, the insulation coordination requirements are as specified in GB/T 16935.4.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated references are cited only.

The version corresponding to this date applies to this document. For undated references, the latest version (including all amendments) applies to this document.

GB/T 311.1 Insulation coordination – Part 1: Definitions, principles and rules (GB/T 311.1-2012, IEC 60071-1:2006) MOD) GB/T 1402-2010 Voltage of Traction Power Supply System for Rail Transit (IEC 60850:2007, MOD) Note. There are no technical differences between the content referenced in GB/T 1402-2010 and the content referenced in IEC 60850:2007.

GB/T 4207 Determination of Tracking Resistance Index and Comparative Tracking Index of Solid Insulating Materials (GB/T 4207-2012) IEC 60112:2009 (IDT) GB/T 6553 Test methods for evaluating resistance to tracking and erosion of electrical insulation materials used under harsh environmental conditions (GB/T 6553-2014,IEC 60587:2007,IDT) GB/T 16927.1 High Voltage Testing Techniques – Part 1: General Definitions and Test Requirements (GB/T 16927.1-2011)