GB/T 31489.3-2020 in English
VALIDD.C. extruded cable systems for power transmission at a rated voltage up to and including 500 kV—Part 3:D.C. submarine cables
- Issued on:2020-12-14
- Implemented on:2021-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
$350.00
| Standard No: | GB/T 31489.3-2020 |
| Document status: | VALID |
| Title in English: | D.C. extruded cable systems for power transmission at a rated voltage up to and including 500 kV—Part 3:D.C. submarine cables |
| Title in Chinese: | 额定电压500kV及以下直流输电用挤包绝缘电力电缆系统 第3部分：直流海底电缆 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2020-12-14 |
| Implemented on: | 2021-07-01 |
| ICS Classification: | 29.060.20-Cables |
| Chinese Classification: | K13-Cable and its accessory |
| Professional Classification: | GB-National Standard |
| Related Keywords: | submarine cable
d.c. submarine cables introduction interpretation dc submarine cables dc transmission cable series standard cable systems |
| Related Topics: | direct current transmission
DC discharge system battery DC voltage direct current transmission Cable sheath extrusion GB/T 31489.3 GB/T 31489.3-2020 DC Cable Accessories Cables for photovoltaic power generation systems Part 2: AC and DC transmission power cables DC cable IEC Extruded Insulated Power Cable DC cable insulation testing |
《GB/T 31489.3-2020额定电压500kV及以下直流输电用挤包绝缘电力电缆系统 第3部分：直流海底电缆》由TC213（全国电线电缆标准化技术委员会）归口，主管部门为中国电器工业协会。
Introduction
Interpretation of the core content of the standard
GB/T 31489.3-2020, as an important part of the DC transmission cable series standard, has formulated technical specifications specifically for cross-linked polyethylene insulated DC submarine cables with rated voltages of 500kV and below. This standard specifies the full process requirements from material properties to acceptance rules.
Key Technical Requirements
| Technical Dimensions | Land Cable (Part 2) | Submarine Cable (Part 3) |
|---|---|---|
| Insulation Thickness | Conventional Design | Increase 10%-15% Redundancy |
| Mechanical Protection | Steel Belt Armor | Double Steel Wire/Flat Steel Wire Armor |
| Water-blocking Structure | Longitudinal Water-blocking | Radial + Longitudinal Composite Water-blocking |
Insulation material performance indicators
The standard specifies two types of cross-linked polyethylene insulation materials:
- DC-XLPE-70: 70℃ long-term operating temperature, 180℃ short-circuit tolerance
- DC-XLPE-90: 90℃ long-term operating temperature, 250℃ short-circuit tolerance
Key performance requirements include:
- Power frequency breakdown strength ≥30kV/mm
- DC breakdown strength ≥100kV/mm
- Thermal extension permanent deformation ≤10%
Implementation suggestions
- Material selection: DC-XLPE-90 insulation material should be given priority in submarine environment
- Structural design: Double steel wire armor structure is recommended for 500kV cables
- Test verification: Space charge test and long-term water tightness test must be carried out
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