DL/T 5224-2005 英文版 高压直流输电大地返回运行系统设计技术规定

ICS 27.100
P 62
Record No. J436—2005
Electric Power Industry Standard of the People's Republic of China
P DL / T 5224 — 2005
Technical Rule for the Design of
HVDC Earth Return Operation System
Issue Date: February 14, 2005 implementation Date: June 1, 2005
Issued by the National Development and Reform Commission of the People's Republic of China

1 Scope
This rule specifies the technical rules for the design of HVDC earth return operation systems and provides the design principles and methods for such systems.
This rule is applicable to the design and test of earthing electrodes on land and (overhead) earthing electrode lines of monopolar and bipolar HVDC power transmission systems.

2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this rule. For dated references, subsequent amendments (excluding the contents of errata) to, or revision of, any of these publications do not apply. However, parties to agreements based on this rule are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 17949.1 Guide for Measuring Earth Resistivity, Ground Impedance and Earth Surface Potentials of a Ground System—Part 1:Normal Measurements
GB 50021—2001 Code for Investigation of Geotechnical Engineering
DL/T 5092—1999 Technical Code for Designing 110 kV— 500 kV Overhead Transmission Line
DL/T 5159—2002 Technical Code for Geophysical Exploration Electric Power Engineering
SL 237—1999 Test Code of Soil

3 Terms and Definitions
The following terms and definitions apply to this rule.
3.0.1 HVDC earth return operation system
A group of devices specially designed and built as current return circuit with earth or seawater in HVDC power transmission system. It mainly includes earthing electrode line, earthing electrode, current guiding system and auxiliary facilities.
3.0.2 Earthing electrode site
The site where the earthing electrode is located.
3.0.3 Earthing electrode line
The overhead line or buried cable connecting the neutral bus in the converter station and the current guiding system of the earthing electrode.
3.0.4 Earthing electrode
An earthing device that can continuously transfer DC current for the DC system, composed of a number of earthing conductors and active filling material. Land installed earthing electrodes are known as land earthing electrodes and those installed onshore or offshore are known as onshore or offshore earthing electrodes.
3.0.5 Current guiding-system
Devices guiding the current from the earthing electrode line to the feeding rods in the earthing electrode, consisting of current guiding wire, frame, disconnector, feeding cable and connection.
3.0.6 Feeding rod
Earthing conductors embedded in the active fillers of an earthing electrode.

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