GB/T 26215-2023Capacitors for snubber circuits of HVDC transmission system converter valves (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 replaces GB/T 26215-2010 "Capacitors for converter valve damping absorption circuits in high-voltage direct current transmission systems" and is consistent with GB/T 26215-2010. Compared with GB/T 26215-2010, in addition to structural adjustments and editorial changes, the main technical changes are as follows:

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

b) "Damping capacitor", "capacitor rated voltage", "capacitor loss tangent", "insulation voltage" and "maximum peak current" have been changed Definition (see Chapter 3, Chapter 3 of the 2010 edition);

c) Added "dry capacitors", "self-healing metallized dielectric capacitors", "maximum root mean square current", "maximum surge current" and "non-periodic Terms and definitions of "impulse voltage", "resonant frequency", "maximum operating temperature" and "equivalent series inductance of capacitor" (see Chapter 3);

d) The content of the "Conditions of Use" has been changed (see Chapter 4, Chapter 4 of the 2010 edition);

e) Delete the provisions for internal discharge resistance measurement in routine tests (see Chapter 6 of the 2010 edition);

f) Added type tests "voltage test between terminals", "AC voltage test between terminals and shell" and "partial discharge test between terminals and shell" "Inspection" project regulations (see 5.7~5.9);

g) The provisions on test grouping of type test procedures are deleted (see Chapter 6 of the 2010 edition);

h) The regulations for using the bridge method in capacitance and loss tangent measurements have been changed, and the capacitance consistency regulations have been added (see 5.5, 2010 edition of Chapters 9 and 10);

i) The test parameters of the voltage test between terminals have been changed (see 5.7, Chapter 12 of the 2010 edition);

j) Changed the regulations on sealing test methods (see 5.10, Chapter 15 of the 2010 edition);

k) Added equivalent series inductance measurement (see Section 5.11);

l) Changed the chapter "Self-healing Test" (see 5.12, Chapter 17 of the 2010 edition);

m) Changed "short circuit discharge test" to "impulse discharge test" (see 5.13, Chapter 18 of the 2010 edition);

n) The power and frequency regulations for thermal stability testing have been changed (see 5.15, Chapter 22 of the 2010 edition);

o) The regulations on temperature, test voltage, and number of discharges of the durability test have been changed (see 5.16, Chapter 20 of the 2010 edition);

p) The temperature and test criteria for the destruction test have been changed (see 5.17, Chapter 21 of the 2010 edition);

q) The test time regulations in the damp heat test have been changed (see 5.18, Chapter 23 of the 2010 edition);

r) The mechanical test regulations have been changed and the collision test has been deleted (see 5.19, Chapter 24 of the 2010 edition);

s) Changed the content that should be indicated on the mark of the capacitor unit (see Chapter 6, Chapter 25 of the 2010 edition);

t) Changed the content of the installation and operation guidelines (see Chapter 7, Chapter 26 of the 2010 edition);

u) The content of environmental protection has been changed (see Chapter 8, Chapter 27 of the 2010 edition);

v) Added fire protection requirements (see Chapter 9);

w) Added normative appendix A (see appendix A).

1 Scope

This document specifies the thyristor-level damping absorption circuit installed in the high-voltage direct current transmission converter valve, which plays the role of damping and voltage equalization. Conditions of use, quality requirements and testing of dry capacitor units, overvoltage, marking of capacitor units, installation and selection guidelines, environmental protection and fire protection requirements.

This document is applicable to the thyristor-level damping absorption circuit installed in the high-voltage DC transmission converter valve, which plays the role of damping and voltage equalization. Dry capacitor unit. The capacitors used in the damping absorption circuit of the thyristor commutation valve of the DC ice melting device can be implemented as a reference.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 311.1 Insulation coordination Part 1: Definitions, principles and rules

GB/T 2423.3 Environmental testing Part 2: Test method Test Cab: Constant humidity and heat test

GB/T 2423.5 Environmental testing Part 2: Test method Test Ea and guidance: Impact

GB/T 2423.10 Environmental testing Part 2: Test method Test Fc: Vibration (sinusoidal)

GB/T 2423.23 Environmental testing Part 2: Test methods Test Q: Sealing

GB/T 2423.60 Environmental testing of electrical and electronic products Part 2: Test methods Test U: Lead-out terminals and overall installation parts strength

GB/T 5169.12 Fire hazard test for electrical and electronic products Part 12: Glow wire/hot wire basic test method Ignition of materials Hot wire flammability index (GWFI) test method

GB/T 5169.16 Fire hazard test for electrical and electronic products Part 16: Test flame 50W horizontal and vertical flame test method

GB/T 17702-2021 Power electronic capacitors

3 Terms and definitions

The following terms and definitions apply to this document.