GB/T 32520-2024Metal-oxide surge arresters with external series gap (EGLA) for overhead transmission and distribution lines of a. c. systems above 1 kV (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document replaces GB/T 32520-2016 "Metal oxides with external series gap for overhead transmission and distribution lines above 1 kV AC" Compared with GB/T 32520-2016, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

--- Added the terms and definitions "series gap", "insulating support", "tensile load" (see 3.3, 3.4, 3.25);

--- Changed the terms and definitions "External series gap line arrester" (see 3.1, 3.1 of the 2016 edition), "Rated voltage of EGLA Pressure" (see 3.8, 3.6 of the 2016 edition);

---Changed the insulation tolerance, residual pressure, mechanical properties of the SVU jacket and the entire EGLA, and the appearance requirements of the SVU composite jacket and support parts Requirements (see 6.1, 6.2, 6.6, 6.15, 6.1, 6.2, 6.6, 6.16 of the 2016 edition);

--- Added requirements for anti-fouling performance, gap distance inspection, insulation support inspection, and galvanized inspection of hardware (see 6.18, 6.19, 6.20, 6.21);

--- Deleted the continuous current of SVU (see 6.14 of the 2016 edition);

--- Deleted the EGLA discharge voltage performance requirements (see 6.18 of the 2016 edition);

--- Added normative reference document GB/T 16927.4 (see 7.1);

--- Changed the high current impulse withstand test (see 8.5, 8.5 of the 2016 edition);

--- Deleted the lightning discharge capability test (see 8.6 of the 2016 edition);

--- Deleted the continuous current test (see 8.12 of the 2016 edition);

---Added repeated charge transfer test, visible corona test, operating impulse withstand voltage test, unified creepage distance inspection, clearance distance Disconnection inspection, power frequency withstand voltage test for support parts, steep wave impulse voltage test for support parts, galvanizing inspection for hardware (see 8.6, 8.18, 8.19, 8.20, 8.21, 8.22, 8.23, 8.24);

--- For polymer (especially composite and resin flex casting) jacket SVU, UV radiation resistance should be in accordance with 8.10.5.1 and 810.5.2 (9.3.2 in GB/T 22079-2008) UV test. If according to 10.8.4 in GB 11032-2010 the weathering test report of the 5000h-test (series B) is applicable to this design and can replace the UV test with the agreement of both the supplier and the buyer.

Change to "For polymer (composite and resin casting) jacket SVU, UV test should be carried out." Delete normative references GB/T 22079-2008 (see 8.10.5, 8.10.5 of the 2016 edition);

--- List the sealing test procedure in detail and delete the normative reference document JB/T 7618-2011 (see 8.14.3, 2016 edition) 8.15.3);

--- Deleted the normative reference document GB/T 2317.2 (see 8.18, 10.4 of the 2016 edition);

--- Changed the normative reference document GB/T 191-2008 to an informative reference document (see Appendix G, Appendix G of the 2016 edition).

This document is modified to adopt IEC 60099-8:2017 "Lightning arresters Part 8: External arresters for overhead transmission and distribution lines for AC systems above 1 kV" Series Gap Metal Oxide Arrester (EGLA)".

Compared with IEC 60099-8:2017, this document has many structural adjustments. A comparison of the structural number changes between the two documents See Appendix A for the table.

This document has many technical differences compared with IEC 60099-8:2017.

A list of these technical differences and their reasons is given in Appendix B.

The following editorial changes were made to this document.

--- To be consistent with my country's technical standard system, the standard name is changed to "External Band for Overhead Transmission and Distribution Lines above 1 kV AC" Series Gap Metal Oxide Arrester (EGLA)";

--- Added informative appendix A, appendix B, appendix G and appendix H.

1 Scope

This document applies to metal oxide surge arresters with external series gaps for AC 1kV and above overhead transmission and distribution lines (hereinafter referred to as External series gap line arrester (EGLA) protects only the line insulation (including insulators and air gap) from lightning-induced flashover or breakdown.

Since the metal oxide resistor of EGLA is connected to the line through an external series gap, the following issues will not be covered in this document consider.

--- Operation impulse discharge voltage;

--- Steep wave and operation impact residual pressure;

---Thermal stability;

---Long continuous current impulse tolerance;

---Power frequency voltage withstand time characteristics of lightning arrester;

--- Disconnector test;

---Aging caused by power frequency voltage.

For some performance requirements of metal oxide arresters with external series gaps that are designed with an integrated design of the arrester body and the gap and cannot be disassembled, the test method is not considered in this document, so this document is not applicable to this type of arrester.

It is requested to refer to some contents of this document for implementation, but additional consideration should be given to the contents of this document that are not evaluated for the performance of this type of lightning arrester.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 311.1-2012 Insulation coordination Part 1: Definitions, principles and rules (IEC 60071-1:2006, MOD) Note. There is no technical difference between the referenced content of GB/T 311.1-2012 and the referenced content of IEC 60071-1:2006.

GB/T 2423.17-2008 Environmental testing for electric and electronic products Part 2: Test method Test Ka. Salt spray (IEC 60068-2-11:1981,IDT) GB/T 2423.22-2012 Environmental testing Part 2: Test method Test N. Temperature change (IEC 60068-2-14.

2009, IDT)

GB/T 2900.12-2008 Electrical terminology Lightning arresters, low voltage surge protectors and components GB/T 2900.19-2022 Electrical terminology High voltage test technology and insulation coordination GB/T 4585-2004 Artificial pollution test for high voltage insulators for AC systems (IEC 60507:1991, IDT) GB/T 7354 High voltage test technique Partial discharge measurement (GB/T 7354-2018, IEC 60270:2000, MOD) GB/T 11032-2020 AC gapless metal oxide arresters (IEC 60099-4:2014, MOD) Note. There is no technical difference between the referenced content of GB/T 11032-2020 and the referenced content of IEC 60099-4:2014.

GB/T 11604-2015 Test methods for radio interference of high voltage electrical equipment (IEC/T RCISPR18-2.2010, MOD) Note. There is no technical difference between the contents cited in GB/T 11604-2015 and those cited in IEC/T RCISPR18-2.2010.