DL/T 5440-2009 英文版 重覆冰架空输电线路设计技术规程

ICS 29.240.20
K 20
Record No. J938—2009
Electric Power Industry Standard of the People's Republic of China
P DL / T 5440 — 2009
Technical Code for Designing of
Overhead Transmission Line in
Medium & Heavy Icing Area
Issue Date: July 22, 2009 implementation Date: December 1, 2009
Issued by the National Energy Administration of the People's Republic of China

1 Scope
This code specifies the technical requirements for the routing, selection and configuration of conductors and shield wires, type and load of towers and crossing, taking into account the characteristics of heavy icing lines.
This code is applicable to the design of 110kV-750kV heavy icing transmission lines. It can also be used as a reference standard for the DC/AC heavy icing transmission lines at other voltage levels.

2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this code. 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 code 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 50545 Code for Design of 110kV-750kV Overhead Transmission Line
DL/T 5158—2002 Technical Code of Meteorological Surveying for Electrical Power Projects

3 General
3.0.1 Heavy icing lines include the transmission lines erected in medium and heavy icing areas.
3.0.2 In addition to this code, the design of heavy icing lines shall observe the requirements as specified in Code for Design of 110kV-750kV Overhead Transmission Line.
3.0.3 When designing heavy icing lines, the measures for avoiding icing or anti-icing shall be given priority. In areas where conditions permit, the measures for melting and preventing icing may be used if justified through technical and economic comparison. For the lines designed with ice melting and prevention measures, design ice thickness shall be selected appropriately to ensure that they have a certain anti-icing capability.
3.0.4 In parallel with the design of heavy icing lines, ice observation stations (points) shall be established and on-line icing monitoring shall be conducted for transmission lines if conditions permit so as to collect the data at ice observation stations and summarize the design and operation experiences.
3.0.5 For the purpose of this code, transmission lines are divided into three categories in terms of voltage levels.
Category 1: lines operating at 750kV, 500kV, and critical lines operating at 330kV;
Category 2: lines operating at 330kV, and critical lines operating at 220kV;
Category 3: lines operating at 220kV and 110kV.

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