GB/T 20994-2007Shunt capacitors and AC filter capacitors for HVDC transmission systems (English PDF)

GB/T 20994-2007 is the English-translated version of 高压直流输电系统用并联电容器及交流滤波电容器.

GB/T 20994-2007 covers the shunt capacitors and AC filter capacitors of HVDC transmission systems.

Clause 1.1 states that the standard is suitable for the shunt capacitors and shunt capacitor banks installed on the AC side of HVDC converter stations to provide reactive power compensation, and for the AC filter capacitors and AC filter capacitor banks used to filter out AC side harmonics and provide reactive power compensation at a fundamental frequency of 50 Hz or 60 Hz, and that its purposes are to set out uniform rules on performance, testing and rating, to set out specific safety rules and to provide guidelines for installation and operation.

The contents list clause 1 General, clause 2 Quality requirements and testing, clause 3 Design and structural requirements, clause 4 Insulation level, clause 5 Overload, clause 6 Safety requirements, two clauses 7 and 8 whose headings the draft renders only as flag capacitor unit and flag capacitor banks, a clause 9 on installation and operation whose heading the draft leaves unfinished, an informative Appendix A with example wiring diagrams of the AC filters common on HVDC transmission lines, and an informative Appendix B with the equations for calculating the capacitor discharge resistor and the discharge time.

Clause 1 itself holds the scope and purpose at 1.1, the normative references at 1.2 and the terms and definitions at 1.3, and clause 1.2 cites GB/T 11024.1, GB/T 11024.2, GB/T 11024.4, GB/T 13540 and GB/T 16927.1.

Clause 1.3 carries four definitions whose term names the draft does not print: a member made up of a dielectric and spaced electrodes; an assembly of one or more capacitor elements in a single housing with a lead terminal; a capacitor whose units are all connected in parallel; and an assembly of one or more series sections mounted on a support frame together with insulators and cable.

The draft breaks off at the end of that clause, so the page shows no text from clauses 2 to 9.

The introduction places the standard in a programme of nineteen national standards developed for HVDC transmission system equipment, covering basic standards, equipment standards and control and protection equipment standards, and lists it as the one on shunt capacitors and AC filter capacitors for HVDC systems.

The foreword records that the standard was proposed by the China Electrical Equipment Industrial Association, that it is administered by SAC/TC45 and that this is its first release, so it replaces no earlier edition; it was issued on 21 June 2007 and has applied since 1 February 2008.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 22 pages — is available in the English PDF.

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