What is handover test
The handover test is a series of testing and verification work performed after the power system, electrical equipment or industrial device is installed and before it is officially put into operation. It aims to ensure that the equipment performance meets the design requirements and the operation is safe and reliable. The following are the hot topics and structured data related to the handover test in the past 10 days across the entire network:
1. Core purpose of handover test
1. Verify equipment installation quality
2. Test insulation performance and electrical parameters
3. Eliminate potential safety hazards
4. Ensure compliance with national standards (such as GB 50150)
| Test type | Main content | Commonly used standards |
|---|---|---|
| Insulation resistance test | Measuring equipment insulation resistance value | GB/T 3048.5 |
| Withstand voltage test | Power frequency/DC withstand voltage detection | DL/T 474.1-2018 |
| Loop resistance test | Contact resistance measurement | GB 50150-2016 |
2. Recent hot technology discussions
1.Applications in new energy fields: New DC side insulation testing requirements for photovoltaic power station handover test
2.Intelligent trend: Application of AI algorithm in transformer winding deformation test
3.Typical cases: A certain UHV substation failed to operate due to failure to strictly implement handover tests.
| Device type | Must-do test items | Latest technical specifications |
|---|---|---|
| power transformer | Transformation ratio test, no-load loss | NB/T 42077-2023 |
| GIS equipment | Partial discharge detection | DL/T 1630-2016 |
| Cable lines | AC withstand voltage test | GB/T 12706.4 |
3. Key points of handover test process
1.Preliminary preparation: Check the calibration certificate of the test instrument and prepare the test plan
2.On-site implementation: Operate strictly according to procedures and record original data
3.data analysis: Compare historical data with standard limits
4.Report preparation: Contains test conclusions and rectification suggestions
4. Frequently Asked Questions and Solutions
| Question type | frequency of occurrence | Handling suggestions |
|---|---|---|
| Insulation resistance is low | 23.7% | Check for humidity effects or local dampness |
| Withstand voltage test breakdown | 6.5% | Stop the test immediately and check for insulation defects |
| Abnormal data fluctuations | 15.2% | Check the wiring method and instrument status |
5. Latest Industry Trends
1. The National Energy Administration releases a revised draft for comments on the "Power Equipment Handover Test Procedures" (2024 version)
2. China Southern Power Grid pilots "Digital Handover Test Reporting System"
3. The International Conference on Large Grids (CIGRE) proposed a new framework for intelligent assessment of handover tests
Summary:The handover test is a "health examination" before power equipment is put into operation, and its standardization and technical content directly affect the safety of the power grid. With the development of new technologies, test methods are transforming from traditional manual detection to intelligent diagnosis, but the core goal is always to ensure the safe and stable operation of the power system.
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