GB/T 36498-2018 in English
VALIDGuidelines for insulation co-ordination of flexible DC converter station
- Issued on:2018-09-17
- Implemented on:2019-04-01
- File Format:PDF
- Delivery:Via email within 5 business days
$476.00
| Standard No: | GB/T 36498-2018 |
| Document status: | VALID |
| Title in English: | Guidelines for insulation co-ordination of flexible DC converter station |
| Title in Chinese: | 柔性直流换流站绝缘配合导则 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2018-09-17 |
| Implemented on: | 2019-04-01 |
| ICS Classification: | 29.240.01-Power transmission and distribution networks in general |
| Chinese Classification: | K40-Electric transmission and transformation equipment in general |
| Professional Classification: | GB-National Standard |
| Related Topics: | iec DC insulator
flexo plate gb t+36498 rectifier flexible DC converter station GBT36498 GB/T 36498-2018 Transducer insulation method Line-to-ground insulation DC resistance Insulation leakage current |
《GB/T 36498-2018柔性直流换流站绝缘配合导则》由TC163（全国高电压试验技术和绝缘配合标准化技术委员会）归口，主管部门为中国电器工业协会。
Introduction
Interpretation of the core content of the standard
| Technical elements | Symmetrical bipolar system | Symmetrical monopolar system |
|---|---|---|
| Arrester chargeability | ≤0.85 | ≤0.7 |
| Typical arrester configuration | AV/LV/DB/DL/CBN series | AV/LV/DB/DL/NV |
| Insulation coordination factor | Operation impulse 1.15-1.25, lightning impulse 1.20-1.25 | |
Key technical innovations
1. Hybrid voltage waveform processing: Aiming at the DC + AC harmonic composite voltage unique to the voltage source converter valve area, an innovative CCOV (peak continuous operating voltage) evaluation system is proposed.
2. Multi-terminal system adaptation: The ±500kV Zhangbei project shown in Appendix C has achieved the standardization of insulation coordination of the four-terminal flexible DC power grid for the first time, and its arrester energy distribution is improved by 300% compared with traditional projects.
Analysis of implementation points
- The selection of arrester reference voltage needs to be considered simultaneously:
- DC bias voltage (bipolar system)
- Harmonic distortion rate (unipolar system)
- Altitude correction factor (≥1000m area)
- The correction formula for calculating the air gap in the valve hall is: U50 = Uw/(1-2σ), where σ is 0.03-0.05
Comparison of typical projects
| Project | Xiamen±320kV | Yu-E±420kV | Zhangbei±500kV |
|---|---|---|---|
| DB arrester SIPL | 570kV/2kA | 870kV/6kA | 904kV/2kA |
| Valve side SIWV | 750kV | 911kV | 1080kV |
| Creepage distance | 323kV benchmark | 424kV benchmark | 550kV benchmark |
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