GB/Z 20996.2-2007 Replaced National standards

GB/Z 20996.2-2007 Performance of high-voltage direct current(HVDC)systems—Part 2:Faults and switching

Publish Date: 2007-06-21 Implement Date: 2024-08-16 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/Z 20996.2-2007

Standard Type: National standards

Standard Status: Replaced

is_force_gb: no

CCS Name: Power semiconductor devices and components

ICS Name: Rectifiers, converters, and regulated power supplies

Publish Date: 2007-06-21

Implement Date: 2024-08-16

Pages: 42 pages

Scope

This part of GB/Z 20996 is a guiding technical document on the transient performance and fault protection requirements of high-voltage direct current (HVDC) systems. It discusses the transient performance of a two-terminal HVDC system composed of a 12-pulse (dynamic) converter unit connected in a three-phase bridge (double-line) configuration during faults and operations. It does not cover multi-terminal HVDC transmission systems, but it does discuss parallel converters and parallel lines included in the two-terminal system. It assumes that the converters use thyristor valves as bridge arms and employ gapless metal-oxide surge arresters for insulation coordination, and that power can be bidirectionally transmitted. This part does not consider diode valves. GB/Z 20996 consists of three parts: Part 1 - Steady-State, Part 2 - Faults and Operations, and Part 3 - Dynamics. During the development and drafting process, every effort has been made to avoid duplication of content among the three parts. Therefore, when users prepare specifications for two-terminal HVDC systems, they should refer to all three parts. For various components of the system, attention should be paid to the differences between system performance specifications and equipment design specifications. This part does not stipulate equipment technical conditions and test requirements, but focuses on those technical requirements that affect system performance. It also does not include detailed seismic performance requirements. Additionally, there may be many differences among different HVDC systems, and this part does not discuss these in detail. Therefore, this part should not be directly used as the technical specification for a specific engineering project. However, it can be used as a basis for preparing technical specifications that meet the actual system requirements for specific transmission systems. The content covered in this part does not distinguish between the responsibilities of users and manu