DL/T 2011-2019 in English
VALIDTest code for field replacement of large generator stator windings
- Issued on:2019-06-04
- Implemented on:2019-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
| Standard No: | DL/T 2011-2019 |
| Document status: | VALID |
| Title in English: | Test code for field replacement of large generator stator windings |
| Title in Chinese: | 大型发电机定子绕组现场更换处理试验规程 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2019-06-04 |
| Implemented on: | 2019-10-01 |
| Professional Classification: | DL-Electricity |
| Related Keywords: | test code
test process test focus test items stator bar surface resistance measurement standard test type |
| Related Topics: | dynamo
generator standard field emission electrons Form-wound winding test procedures field emission electrons replace thermal field emission electrons stator thermal field electron emission large slaughter site field emission electron source motor stator Stator winding partial discharge test Low voltage motor winding replacement standards Motor stator 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
Analysis of the core content of the standard
| Test type | Water-cooled generator | Surface-cooled generator | Key differences |
|---|---|---|---|
| Insulation test | Add water system sealing test | Focus on surface resistance measurement | Differences in cooling medium |
| Withstand voltage test | 2.5Un+2kV | 2Un+1kV | Different test voltage levels |
Detailed explanation of technical points
1. Test phase division
The standard divides the test process into 6 key phases: wire removal preparation → new wire rod inspection → wire insertion process → general drying process → before rotor insertion → start-up test. Corresponding test combinations need to be performed in each phase.
2. Core test items
- Stator bar surface resistance measurement (required 1-100kΩ)
- Dielectric loss factor test (tanδ≤0.08)
- Partial discharge detection (≤10pC)
- Slot potential measurement (2 points at the steam/excitation end)
Implementation suggestions
Typical case: Stator replacement of a 600MW unit
When adopting the full replacement plan, special attention should be paid to the following:
- The sampling ratio of new bars ≥10% (JB/T 6204 requirement)
- A special micrometer is required to check the tightness of the slot wedge (the difference of the corrugated plate is ≤0.5mm)
- The end dynamic characteristics test must be carried out after the total baking (GB/T 20140)
Key points of risk prevention and control
| Risk link | Control measures | Standard basis |
|---|---|---|
| Insulation damage | Coated aluminum foil electrode + infrared temperature rise monitoring | Appendix B.2.c |
| Abnormal slot potential | The distance between measuring points is ≤300mm | Appendix C.1.h |
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