DL/T 5789-2019 in English
VALIDTechnical guidelines for construction of insulated tubular busbar
- Issued on:2019-06-04
- Implemented on:2019-10-01
- File Format:PDF
- Delivery:Via email within 5 business days
$582.00
| Standard No: | DL/T 5789-2019 |
| Document status: | VALID |
| Title in English: | Technical guidelines for construction of insulated tubular busbar |
| Title in Chinese: | 绝缘管型母线施工工艺导则 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2019-06-04 |
| Implemented on: | 2019-10-01 |
| Professional Classification: | DL-Electricity |
| Related Topics: | edge
process linearity insulating tube cast construction technology insulated metal wire construction technology Guidelines for Construction Technology of Insulated Tubular Busbar Tubular busbar handover test standards Insulated tube busbar Tubular busbar Fully insulated pipe female Subway construction technology Process pipeline pressure Process water conductivity dl/t2011-2019 dl/t1966-2019 dl/t5784-2019 dl/t5787-2019 dl/t 5786-2019 dl/t 799 -2019 dl/t 5796-2019 |
Introduction
Core content interpretation
| Technical elements | Standard requirements | Implementation points |
|---|---|---|
| Bracket installation | Non-magnetic material, span error ≤2mm | Anti-corrosion treatment is required after welding, and 2-3 bolts are exposed |
| Busbar fixing | Single-point grounding, cross-section of grounding wire ≥ design value | Grounding through fixing hardware is prohibited, and the horizontal section is led from the bottom |
| Intermediate joint | Insulation strength ≥ body, waterproof grade IP68 | Straight section installation, wrapping overlap rate ≥15% |
| Power frequency withstand voltage | 80% factory value, no flashover for 5min | 2500V megohmmeter insulation ≥500MΩ |
Key technical specifications
Typical problem: Partial discharge at the joint of the insulated tubular busbar of a substation. After detection, it was found that the copper shielding tape was wrinkled, causing electric field distortion. The treatment plan was strictly re-wrapped according to clause 5.5.9, and the overlap rate was increased to 20%. After 72h live test, the discharge amount was <10pC.
Temperature compensation: Article 5.1.3 of the standard stipulates that an Ω-type expansion joint must be installed every 30m. The bending radius should be ≥20D (D is the outer diameter of the busbar). During installation, the pre-bias amount is calculated according to ΔL=α·L·Δt (α=1.68×10⁻⁵/℃).
Construction process optimization
- Support re-measurement: laser rangefinder to verify the center deviation of the pillar ≤3mm
- Hoisting protection: nylon sling + multi-point balancing device, protective cover thickness ≥2mm
- Joint treatment: argon arc welding gap 2-3mm, weld protrusion height 2-4mm
Test acceptance standard
| Item | Standard value | Method |
|---|---|---|
| Insulation resistance | ≥500MΩ | 2500V megohmmeter |
| Contact resistance | ≤1.2 times the resistance of equal-length conductor | DC voltage drop method |
| AC withstand voltage | 80% factory value | 5min power frequency test |
Project implementation suggestions
- Establish 3D BIM model for pre-arrangement to avoid pipeline conflicts
- When humidity is > 80%, use moisture-proof shed and equip with dehumidification equipment
- Use infrared thermal imager to scan temperature of the entire line
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