GB/T 34577-2017 in English
SUPERSEDEDTechnical guide for by-pass working on ditsribution line
- Issued on:2017-09-29
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 5 business days
$476.00
《GB/T 34577-2017配电线路旁路作业技术导则》由TC36（全国带电作业标准化技术委员会）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
| Technical elements | 10kV requirements | 20kV requirements | Common indicators |
|---|---|---|---|
| Power frequency withstand voltage | 45kV/1min | 55kV/1min | Insulation resistance ≥500MΩ |
| Lightning impulse | ±75kV | ±125kV | Partial discharge ≤10pC |
| Current carrying capacity | 35mm²:150A 50mm²:200A | Temperature rise ≤55K | |
Technical specifications for key equipment
Bypass flexible cable
It adopts a multi-strand soft copper wire conductor structure, with a cross-sectional area of ≥35mm², an insulation layer made of EPDM and other materials (thickness ≥5mm), a shielding layer of galvanized copper wire (≥10mm²), and an outer sheath of weather-resistant rubber (≥2mm). The mechanical performance requires a bending radius of ≤8 times the outer diameter, and the performance is maintained after 1000 bending tests.
Bypass load switch
It must have a phase-checking function, and SF6 insulation is recommended. The mechanical life is ≥3000 times and the breaking time is <20ms. The 10kV level must meet 45kV power frequency withstand voltage, 200A rated current, and 40kA short-circuit closing capacity.
Typical operation process
- Load transfer phase: Lay bypass cable → Install load switch → Live connection → Phase confirmation
- Maintenance implementation phase: Disconnect original line → Monitor shunt → Equipment maintenance
- Restoration phase: Restore connection → Secondary phase verification → Remove bypass system
Key points of safety control
- Weather restrictions: Live work is prohibited when wind speed is >10m/s (level 5) or humidity is >80%
- Personnel qualifications: The person in charge of the work must have more than 3 years of experience in power distribution maintenance and hold a certificate
- Equipment inspection: 500MΩ insulation resistance test must be carried out before use
- Prevent misoperation: Strictly implement the work ticket and supervision system
Technical innovation
This standard systematically regulates for the first time:
- Quick-plug connector technology (mechanical life ≥ 1000 times)
- Parallel operation conditions of mobile box transformers (ratio difference ≤ 5%)
- Overhead laying mechanized operation process (maximum traction length 200m)
Implementation suggestions
| Operation type | Recommended equipment | Risk prevention and control |
|---|---|---|
| Overhead line maintenance | Insulating bracket + bypass load switch | Insulation anti-fall device |
| Cable line maintenance | Quick-plug terminal + ring network cabinet adapter | Connector silicone grease protection |
| Transformer maintenance | Mobile box transformer + parallel operation monitoring | Strict phase verification process |
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