GB/T 37013-2018 in English
VALIDMaintenance specification of transmission line of voltage-source converter based high voltage direct current(VSC-HVDC)
- Issued on:2018-12-28
- Implemented on:2019-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
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| Standard No: | GB/T 37013-2018 |
| Document status: | VALID |
| Title in English: | Maintenance specification of transmission line of voltage-source converter based high voltage direct current(VSC-HVDC) |
| Title in Chinese: | 柔性直流输电线路检修规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2018-12-28 |
| Implemented on: | 2019-07-01 |
| ICS Classification: | 29.240.20-Power transmission and distribution lines |
| Chinese Classification: | F21-Electric power system |
| Professional Classification: | GB-National Standard |
| Related Keywords: | cable line maintenance
maintenance technology system polarity maintenance maintenance specification maintenance levels |
| Related Topics: | transmission line
DC transmission technology flexo plate power transmission direct current transmission current detection circuit Streamlined Linear Requirements Streamline detection process GBT37013 GB/T 37013-2018 DC Lines [2013] 14 DC distribution line design Flexible DC transmission commissioning calculation |
《GB/T 37013-2018柔性直流输电线路检修规范》由TC324（全国高压直流输电工程标准化技术委员会）归口，主管部门为中国电力企业联合会。
Introduction
Analysis of the core content of the standard
This standard systematically constructs a maintenance technology system for flexible DC transmission lines for the first time, and innovatively divides the maintenance levels into four levels: A/B/C/D:
| Maintenance level | Power outage requirements | Typical work content | Cycle benchmark |
|---|---|---|---|
| Grade A maintenance | Power outage of the entire line | Replacement of cables/accessories in batches, reconstruction of channels | 10 years/when necessary |
| Grade B maintenance | Partial power outage | Diagnostic test, replacement of key components | 3-5 years |
| Grade C maintenance | Planned power outage | Preventive test, fault elimination maintenance | 1 year |
| Grade D maintenance | No power outage | Live detection, professional inspection | 0.5-3 months |
Key technical requirements
1. Core indicators of cable line maintenance
The insulation resistance of the land cable is tested using a 2500V megohmmeter, requirements:
- Main insulation resistance: ≥1000MΩ·km for land cables, ≥500MΩ·km for submarine cables
- Outer sheath resistance: ≥0.5MΩ·km and deviation from initial value ≤10%
Typical failure case: A ±320kV flexible DC project adopted YJLW03-Z 500kV cable. After 3 years of operation, the B-level maintenance found that the insulation resistance of the outer sheath dropped to 0.3MΩ·km. It was located as caused by mechanical damage and recovered to 1.2MΩ·km after repair with heat shrink tubing.
2. Special requirements for overhead lines
Special requirements for polarity maintenance for flexible DC overhead lines:
- Polarity markings must be verified after all hardware and insulators are replaced
- Polarity verification items must be added to line arrester inspection
- DC electric field influence must be considered when verifying cross-span distance
Innovative technical measures
1. Special discharge device (Appendix A)
To address the problem of residual charge in high-voltage cables, the standard pioneered a five-level resistor segmented discharge method:
| Voltage stage (kV) | Connection resistance | Discharge time |
|---|---|---|
| 100→90 | 160MΩ | ≥15min |
| 90→40 | 80MΩ | ≥30min |
| 40→4 | 20MΩ | ≥24h |
Compared with the traditional direct grounding method, the safety is improved by more than 80%.
2. Fault Location Technology System (Appendix B)
Establish a differentiated fault location method matrix:
| Fault type | Ranging method | Precise positioning | Applicable scenarios |
|---|---|---|---|
| Low resistance fault (<10Ω) | Low voltage pulse method | Audio induction method | Metallic short circuit |
| High resistance fault | Secondary pulse method | Acoustic and magnetic synchronization method | Cable main insulation |
| Outer sheath fault | Step voltage method | Characteristic current method | Direct buried cable |
Standard implementation recommendations
- Condition assessment first: It is recommended to establish an equipment health model by combining data such as infrared detection (DL/T664) and oil sample test (GB/T507)
- Differentiation cycle: The submarine cable route inspection cycle should be adjusted from 1 week to dynamic adjustment, combined with AIS/VTS system optimization
- New technology integration: It is recommended to include drone inspection (Clause 6.1.3) in the routine means of Class D maintenance
- Full process control: The maintenance document package should include the 7 types of technical documents required by Clause 7.2 to achieve closed-loop management
Analysis of Standard Evolution
Compared with traditional DC transmission maintenance standards, this standard has three breakthroughs:
- For the first time, it clarifies the maintenance items unique to VSC-HVDC (such as polarity detection of cable terminals on the converter station side)
- Innovatively introduces a high-voltage residual charge treatment solution based on a dedicated discharge device
- Establishes a comprehensive submarine cable protection system (including AIS monitoring, route detection, etc.)
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