GB/T 20996.2-2020 in English
VALIDPerformance of high-voltage direct current (HVDC) systems with line-commutated converters—Part 2:Faults and switching
- Issued on:2020-12-14
- Implemented on:2021-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 20996.2-2020采用电网换相换流器的高压直流系统的性能 第2部分：故障和操作》由TC60（全国电力电子系统和设备标准化技术委员会）归口，TC60SC2（全国电力电子系统和设备标准化技术委员会输配电系统电力电子技术分会）执行，主管部门为中国电器工业协会。
Introduction
Framework for transient performance specifications of HVDC systems
GB/T 20996.2-2020 focuses on two-terminal HVDC systems consisting of 12-pulse commutation units, and specifies the performance requirements during faults and operations, including:
- Transient process of switching equipment on the AC side (Section 4.2)
- Fault recovery characteristics of AC systems (Chapter 5)
- Converter unit protection configuration (Section 7.4)
- DC line fault clearing strategy (Section 9.5)
Comparison of key protection technologies
| Protection type | Detection method | Action time | Typical application |
|---|---|---|---|
| Converter differential protection | Compare valve side with DC current | <10ms | Bridge arm short circuit (Section 7.2) |
| DC line protection | dv/dt+voltage drop | 20-100ms | Overhead line lightning strike (Section 9.1) |
| Metal loop protection | Current differential | 100-500ms | Conductor grounding (Section 11.4) |
Key points of insulation coordination design
Section 12.7 of the standard stipulates that the following considerations must be given to the configuration of lightning arresters:
- The valve arrester (V) must withstand the AC operating wave (12.7.3)
- The DC bus arrester (DB) determines the insulation level of the pole equipment
- The neutral bus arrester (E1/E2) must meet the energy requirements for single-pole operation
Typical case:The lightning arrester combination of a series converter station (Figure 22) requires additional consideration of the line discharge current when the unit is short-circuited.
Implementation Suggestions
Based on the standard requirements, the following points should be noted during project implementation:
- Use phase-selective circuit breakers for switching AC filters (Section 4.2)
- The creepage distance in the valve hall is designed to be 1.4-1.6cm/kV (Section 12.10.2)
- Dual configuration of the communication system (Section 13.2)
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