GB/T 25843-2017 in English
VALIDTechnical requirements of control and protection equipment of ±800 kV ultra high voltage direct current transmission
- Issued on:2017-12-29
- Implemented on:2018-07-01
- File Format:PDF
- Delivery:Within 1 day
$427.00
《GB/T 25843-2017±800 kV 特高压直流输电控制与保护设备技术要求》由TC154（全国量度继电器和保护设备标准化技术委员会）归口，主管部门为中国电器工业协会。
Introduction
Analysis of the core content of the standard
This standard specifies the technical specifications of ±800kV UHV DC transmission control and protection equipment, which is applicable to DC systems with dual 12-pulse converter series structures. Compared with the 2010 version of the guidelines, 7 technical changes have been added, including valve cooling system interface and test classification optimization.
Comparison of key technical requirements
| Technical dimensions | 2010 version | 2017 version | Upgrade points |
|---|---|---|---|
| Nature of the standard | Technical guidelines | Technical requirements | Upgraded to a mandatory standard |
| Protection partitions | 6 | 8 | Newly added converter connection busbar protection zone |
| Valve cooling interface | Undefined | Independent chapter | Added special function requirements |
| Test classification | Category 2 | Category 3 | New joint debugging test |
Key points of implementation
Environmental adaptability requirements
The equipment must work normally in the temperature range of -10℃~+55℃ and humidity conditions of 5%~95%, and pass the following:
- Power frequency withstand voltage 2000V/1min
- 5kV lightning impulse voltage
- Vibration test specified in GB/T 14598.2
Redundancy design specifications
The control equipment adopts a dualization + switching logic structure, and the protection equipment adopts a dualization/tripling configuration:
| Control system switching time | ≤10ms |
| Protection system voting mechanism | Three-out-of-two logic |
| Independent measurement circuit | Each system is configured separately |
Typical application case
In a ±800kV project, the pole control system adopts the converter voltage balance control strategy:
- The triggering angle difference of the series converter is controlled within ±0.5°
- The gear difference of the tap changer is ≤2 gears
- Dynamic response time<50ms
After implementation, the voltage imbalance of the dual converters dropped from 3% to 0.8%.
Background of Standard Evolution
As the capacity of UHV DC projects increases to 12 million kilowatts, the 2017 version of the standard focuses on strengthening:
- Multi-converter coordinated control
- Valve cooling system linkage protection
- Electromagnetic compatibility (EMC) immunity requirements
- Network information security protection
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