DL/T 2575-2022 in English
VALIDGuide for stator technology refurbishment of bulb hydro generator
- Issued on:2022-11-04
- Implemented on:2023-05-04
- File Format:PDF
- Delivery:Via email within 1~3 business days
$233.00
| Standard No: | DL/T 2575-2022 |
| Document status: | VALID |
| Title in English: | Guide for stator technology refurbishment of bulb hydro generator |
| Title in Chinese: | 灯泡贯流式水轮发电机定子绕组改造技术规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2022-11-04 |
| Implemented on: | 2023-05-04 |
| Professional Classification: | DL-Electricity |
| Related Keywords: | stator technology refurbishment
bulb hydro generator introduction technical background stator winding core transformation types transformation type applicable conditions key key technical indicators |
| Related Topics: | transform
sn/t 2575 streaming xi technology Regulations for Overhaul of Bulb Tubular Hydrogenerator Units stator water wheel Molecular detection technology flow cytometry Directed transformation Start-up test procedure for bulb tubular hydro-generator set Hydrogenerator Bulb flow Hydrogenerator performance Hydraulic generator unit USA Generator set quality technology |
Introduction
Technical background and evolution of the standard
my country's installed hydropower capacity has reached 400 million kilowatts, of which bulb-type units account for about 15%. This standard fills the gap in technical specifications in the field of stator winding transformation. Compared with the 2008 version of GB/T 7894, it adds 5 key technical indicators and raises the insulation level from F to H.
Comparison of core transformation types
| Transformation type | Applicable conditions | Key technical points | Expected benefits |
|---|---|---|---|
| Update and transformation | Winding aging ≥ 30 years | Full winding replacement | Life extended by 20 years |
| Capacity increase and transformation | Load rate >85% | Wire gauge upgrade + cooling optimization | Capacity increased by 15-25% |
Key technical requirements
5.1 Feasibility Study
Electromagnetic calculation review, ventilation simulation and mechanical strength verification are required. A typical case shows that the efficiency of a power station was increased from 94.2% to 95.8% through transformation.
6.3 Insulation treatment
The VPI vacuum pressure impregnation process is required, and the insulation resistance value shall comply with the provisions of GB 50150:
- Stator winding: ≥100MΩ (20℃)
- Absorption ratio: ≥1.6
Implementation suggestions
Take the transformation of a power station of Wuling Power as an example:
- Infrared thermal imager was used to detect local hot spots in the early stage
- After the transformation, the 72-hour continuous trial operation specified in DL/T 827 was passed
- The vibration value is controlled below 80μm
Assessment and evaluation system
Appendix A specifies 9 categories and 32 items of evaluation indicators, among which the key items include:
- Temperature rise test deviation ≤5K
- Partial discharge quantity <1000pC
- Winding deformation rate <3%
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