DL/T 5429-2009 in English

1 Scope
This code specifies the basic requirements for the design of electric power system, including power demand forecast, design of power source and grid schemes, calculation of power flow, phase modulation and voltage regulation, system stability, short-circuit current, power frequency over-voltage and secondary arc current, as well as the comparison of various schemes in terms of economy.
This code is applicable to design of electric power system of 220kV and above (primary part), to the study on special topics of electric power system, the design for connecting power plants, substations and converter stations to the system, the feasibility study on power generation, transmission and transformation projects as well as preliminary design of system part.

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.
DL 755 Guidelines for Safety and Stability of Power Systems
SD 325 Technical Guidelines for Voltage and Reactive Power of Power Systems (trial)
Provisional Regulations for Economic Analysis of Electric Power Projects, issued by the former Ministry of Water Resources and Electric Power (Dianjizi [82] No.44)

3 General
3.0.1 The design of power systems shall follow the industrial policy, development guiding principle and various technical and economic policies of the electric power industry and shall be market-oriented, on the grounds of safety and stability and in line with the fundamental principle of optimal allocation of energy resources such that the design is scientifically demonstrated, technically advanced and economically viable.
3.0.2 The design of an electric power system shall be based on power industry planning, grid planning, and transmission system planning of the power plants. The detailed development scheme shall be further studied and proposed while taking into account the overall conditions of the electric power system.
3.0.3 The layout of the power sources and power grid shall be considered reasonably when designing the power system to ensure that the power generation, transmission, transformation projects and reactive power supply can be built in a coordinated manner and lay a foundation for design of relay protection, design of power system safety automatic control devices, communication design, dispatching automation, and design of electric power system of a lower rated voltage level.
3.0.4 The safe and stable operation of an electric power system prerequisites a reasonably designed grid structure. While ensuring the safe and stable operation of the system and satisfying the demands for power market dvelopment, the design shall consider all the factors comprehensively to achieve a reasonable layout of the power grid